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GtkWidget

GtkWidget — Base class for all widgets

Synopsis


#include <gtk/gtk.h>

                    GtkWidget;
                    GtkWidgetClass;
enum                GtkWidgetFlags;
#define             GTK_WIDGET_TYPE                     (wid)
#define             GTK_WIDGET_STATE                    (wid)
#define             GTK_WIDGET_SAVED_STATE              (wid)
#define             GTK_WIDGET_FLAGS                    (wid)
#define             GTK_WIDGET_TOPLEVEL                 (wid)
#define             GTK_WIDGET_NO_WINDOW                (wid)
#define             GTK_WIDGET_REALIZED                 (wid)
#define             GTK_WIDGET_MAPPED                   (wid)
#define             GTK_WIDGET_VISIBLE                  (wid)
#define             GTK_WIDGET_DRAWABLE                 (wid)
#define             GTK_WIDGET_SENSITIVE                (wid)
#define             GTK_WIDGET_PARENT_SENSITIVE         (wid)
#define             GTK_WIDGET_IS_SENSITIVE             (wid)
#define             GTK_WIDGET_CAN_FOCUS                (wid)
#define             GTK_WIDGET_HAS_FOCUS                (wid)
#define             GTK_WIDGET_CAN_DEFAULT              (wid)
#define             GTK_WIDGET_RECEIVES_DEFAULT         (wid)
#define             GTK_WIDGET_HAS_DEFAULT              (wid)
#define             GTK_WIDGET_HAS_GRAB                 (wid)
#define             GTK_WIDGET_RC_STYLE                 (wid)
#define             GTK_WIDGET_COMPOSITE_CHILD          (wid)
#define             GTK_WIDGET_APP_PAINTABLE            (wid)
#define             GTK_WIDGET_DOUBLE_BUFFERED          (wid)
#define             GTK_WIDGET_SET_FLAGS                (wid,flag)
#define             GTK_WIDGET_UNSET_FLAGS              (wid,flag)
void                (*GtkCallback)                      (GtkWidget *widget,
                                                         gpointer data);
                    GtkRequisition;
struct              GtkAllocation;
                    GtkSelectionData;
                    GtkWidgetAuxInfo;
                    GtkWidgetShapeInfo;
enum                GtkWidgetHelpType;
GtkWidget*          gtk_widget_new                      (GType type,
                                                         const gchar *first_property_name,
                                                         ...);
GtkWidget*          gtk_widget_ref                      (GtkWidget *widget);
void                gtk_widget_unref                    (GtkWidget *widget);
void                gtk_widget_destroy                  (GtkWidget *widget);
void                gtk_widget_destroyed                (GtkWidget *widget,
                                                         GtkWidget **widget_pointer);
void                gtk_widget_set                      (GtkWidget *widget,
                                                         const gchar *first_property_name,
                                                         ...);
void                gtk_widget_unparent                 (GtkWidget *widget);
void                gtk_widget_show                     (GtkWidget *widget);
void                gtk_widget_show_now                 (GtkWidget *widget);
void                gtk_widget_hide                     (GtkWidget *widget);
void                gtk_widget_show_all                 (GtkWidget *widget);
void                gtk_widget_hide_all                 (GtkWidget *widget);
void                gtk_widget_map                      (GtkWidget *widget);
void                gtk_widget_unmap                    (GtkWidget *widget);
void                gtk_widget_realize                  (GtkWidget *widget);
void                gtk_widget_unrealize                (GtkWidget *widget);
void                gtk_widget_queue_draw               (GtkWidget *widget);
void                gtk_widget_queue_resize             (GtkWidget *widget);
void                gtk_widget_queue_resize_no_redraw   (GtkWidget *widget);
void                gtk_widget_draw                     (GtkWidget *widget,
                                                         const GdkRectangle *area);
void                gtk_widget_size_request             (GtkWidget *widget,
                                                         GtkRequisition *requisition);
void                gtk_widget_get_child_requisition    (GtkWidget *widget,
                                                         GtkRequisition *requisition);
void                gtk_widget_size_allocate            (GtkWidget *widget,
                                                         GtkAllocation *allocation);
void                gtk_widget_add_accelerator          (GtkWidget *widget,
                                                         const gchar *accel_signal,
                                                         GtkAccelGroup *accel_group,
                                                         guint accel_key,
                                                         GdkModifierType accel_mods,
                                                         GtkAccelFlags accel_flags);
gboolean            gtk_widget_remove_accelerator       (GtkWidget *widget,
                                                         GtkAccelGroup *accel_group,
                                                         guint accel_key,
                                                         GdkModifierType accel_mods);
void                gtk_widget_set_accel_path           (GtkWidget *widget,
                                                         const gchar *accel_path,
                                                         GtkAccelGroup *accel_group);
GList*              gtk_widget_list_accel_closures      (GtkWidget *widget);
gboolean            gtk_widget_can_activate_accel       (GtkWidget *widget,
                                                         guint signal_id);
gboolean            gtk_widget_event                    (GtkWidget *widget,
                                                         GdkEvent *event);
gboolean            gtk_widget_activate                 (GtkWidget *widget);
void                gtk_widget_reparent                 (GtkWidget *widget,
                                                         GtkWidget *new_parent);
gboolean            gtk_widget_intersect                (GtkWidget *widget,
                                                         const GdkRectangle *area,
                                                         GdkRectangle *intersection);
gboolean            gtk_widget_is_focus                 (GtkWidget *widget);
void                gtk_widget_grab_focus               (GtkWidget *widget);
void                gtk_widget_grab_default             (GtkWidget *widget);
void                gtk_widget_set_name                 (GtkWidget *widget,
                                                         const gchar *name);
const gchar*        gtk_widget_get_name                 (GtkWidget *widget);
void                gtk_widget_set_state                (GtkWidget *widget,
                                                         GtkStateType state);
void                gtk_widget_set_sensitive            (GtkWidget *widget,
                                                         gboolean sensitive);
void                gtk_widget_set_parent               (GtkWidget *widget,
                                                         GtkWidget *parent);
void                gtk_widget_set_parent_window        (GtkWidget *widget,
                                                         GdkWindow *parent_window);
GdkWindow *         gtk_widget_get_parent_window        (GtkWidget *widget);
void                gtk_widget_set_uposition            (GtkWidget *widget,
                                                         gint x,
                                                         gint y);
void                gtk_widget_set_usize                (GtkWidget *widget,
                                                         gint width,
                                                         gint height);
void                gtk_widget_set_events               (GtkWidget *widget,
                                                         gint events);
void                gtk_widget_add_events               (GtkWidget *widget,
                                                         gint events);
void                gtk_widget_set_extension_events     (GtkWidget *widget,
                                                         GdkExtensionMode mode);
GdkExtensionMode    gtk_widget_get_extension_events     (GtkWidget *widget);
GtkWidget*          gtk_widget_get_toplevel             (GtkWidget *widget);
GtkWidget*          gtk_widget_get_ancestor             (GtkWidget *widget,
                                                         GType widget_type);
GdkColormap*        gtk_widget_get_colormap             (GtkWidget *widget);
void                gtk_widget_set_colormap             (GtkWidget *widget,
                                                         GdkColormap *colormap);
GdkVisual*          gtk_widget_get_visual               (GtkWidget *widget);
gint                gtk_widget_get_events               (GtkWidget *widget);
void                gtk_widget_get_pointer              (GtkWidget *widget,
                                                         gint *x,
                                                         gint *y);
gboolean            gtk_widget_is_ancestor              (GtkWidget *widget,
                                                         GtkWidget *ancestor);
gboolean            gtk_widget_translate_coordinates    (GtkWidget *src_widget,
                                                         GtkWidget *dest_widget,
                                                         gint src_x,
                                                         gint src_y,
                                                         gint *dest_x,
                                                         gint *dest_y);
gboolean            gtk_widget_hide_on_delete           (GtkWidget *widget);
void                gtk_widget_set_style                (GtkWidget *widget,
                                                         GtkStyle *style);
#define             gtk_widget_set_rc_style             (widget)
void                gtk_widget_ensure_style             (GtkWidget *widget);
GtkStyle*           gtk_widget_get_style                (GtkWidget *widget);
#define             gtk_widget_restore_default_style    (widget)
void                gtk_widget_reset_rc_styles          (GtkWidget *widget);
void                gtk_widget_push_colormap            (GdkColormap *cmap);
void                gtk_widget_pop_colormap             (void);
void                gtk_widget_set_default_colormap     (GdkColormap *colormap);
GtkStyle*           gtk_widget_get_default_style        (void);
GdkColormap*        gtk_widget_get_default_colormap     (void);
GdkVisual*          gtk_widget_get_default_visual       (void);
void                gtk_widget_set_direction            (GtkWidget *widget,
                                                         GtkTextDirection dir);
enum                GtkTextDirection;
GtkTextDirection    gtk_widget_get_direction            (GtkWidget *widget);
void                gtk_widget_set_default_direction    (GtkTextDirection dir);
GtkTextDirection    gtk_widget_get_default_direction    (void);
void                gtk_widget_shape_combine_mask       (GtkWidget *widget,
                                                         GdkBitmap *shape_mask,
                                                         gint offset_x,
                                                         gint offset_y);
void                gtk_widget_input_shape_combine_mask (GtkWidget *widget,
                                                         GdkBitmap *shape_mask,
                                                         gint offset_x,
                                                         gint offset_y);
void                gtk_widget_path                     (GtkWidget *widget,
                                                         guint *path_length,
                                                         gchar **path,
                                                         gchar **path_reversed);
void                gtk_widget_class_path               (GtkWidget *widget,
                                                         guint *path_length,
                                                         gchar **path,
                                                         gchar **path_reversed);
gchar*              gtk_widget_get_composite_name       (GtkWidget *widget);
void                gtk_widget_modify_style             (GtkWidget *widget,
                                                         GtkRcStyle *style);
GtkRcStyle *        gtk_widget_get_modifier_style       (GtkWidget *widget);
void                gtk_widget_modify_fg                (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);
void                gtk_widget_modify_bg                (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);
void                gtk_widget_modify_text              (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);
void                gtk_widget_modify_base              (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);
void                gtk_widget_modify_font              (GtkWidget *widget,
                                                         PangoFontDescription *font_desc);
void                gtk_widget_modify_cursor            (GtkWidget *widget,
                                                         const GdkColor *primary,
                                                         const GdkColor *secondary);
PangoContext *      gtk_widget_create_pango_context     (GtkWidget *widget);
PangoContext *      gtk_widget_get_pango_context        (GtkWidget *widget);
PangoLayout *       gtk_widget_create_pango_layout      (GtkWidget *widget,
                                                         const gchar *text);
GdkPixbuf *         gtk_widget_render_icon              (GtkWidget *widget,
                                                         const gchar *stock_id,
                                                         GtkIconSize size,
                                                         const gchar *detail);
void                gtk_widget_pop_composite_child      (void);
void                gtk_widget_push_composite_child     (void);
void                gtk_widget_queue_clear              (GtkWidget *widget);
void                gtk_widget_queue_clear_area         (GtkWidget *widget,
                                                         gint x,
                                                         gint y,
                                                         gint width,
                                                         gint height);
void                gtk_widget_queue_draw_area          (GtkWidget *widget,
                                                         gint x,
                                                         gint y,
                                                         gint width,
                                                         gint height);
void                gtk_widget_reset_shapes             (GtkWidget *widget);
void                gtk_widget_set_app_paintable        (GtkWidget *widget,
                                                         gboolean app_paintable);
void                gtk_widget_set_double_buffered      (GtkWidget *widget,
                                                         gboolean double_buffered);
void                gtk_widget_set_redraw_on_allocate   (GtkWidget *widget,
                                                         gboolean redraw_on_allocate);
void                gtk_widget_set_composite_name       (GtkWidget *widget,
                                                         const gchar *name);
gboolean            gtk_widget_set_scroll_adjustments   (GtkWidget *widget,
                                                         GtkAdjustment *hadjustment,
                                                         GtkAdjustment *vadjustment);
gboolean            gtk_widget_mnemonic_activate        (GtkWidget *widget,
                                                         gboolean group_cycling);
void                gtk_widget_class_install_style_property
                                                        (GtkWidgetClass *klass,
                                                         GParamSpec *pspec);
void                gtk_widget_class_install_style_property_parser
                                                        (GtkWidgetClass *klass,
                                                         GParamSpec *pspec,
                                                         GtkRcPropertyParser parser);
GParamSpec*         gtk_widget_class_find_style_property
                                                        (GtkWidgetClass *klass,
                                                         const gchar *property_name);
GParamSpec**        gtk_widget_class_list_style_properties
                                                        (GtkWidgetClass *klass,
                                                         guint *n_properties);
GdkRegion *         gtk_widget_region_intersect         (GtkWidget *widget,
                                                         const GdkRegion *region);
gint                gtk_widget_send_expose              (GtkWidget *widget,
                                                         GdkEvent *event);
void                gtk_widget_style_get                (GtkWidget *widget,
                                                         const gchar *first_property_name,
                                                         ...);
void                gtk_widget_style_get_property       (GtkWidget *widget,
                                                         const gchar *property_name,
                                                         GValue *value);
void                gtk_widget_style_get_valist         (GtkWidget *widget,
                                                         const gchar *first_property_name,
                                                         va_list var_args);
AtkObject*          gtk_widget_get_accessible           (GtkWidget *widget);
gboolean            gtk_widget_child_focus              (GtkWidget *widget,
                                                         GtkDirectionType direction);
void                gtk_widget_child_notify             (GtkWidget *widget,
                                                         const gchar *child_property);
void                gtk_widget_freeze_child_notify      (GtkWidget *widget);
gboolean            gtk_widget_get_child_visible        (GtkWidget *widget);
GtkWidget *         gtk_widget_get_parent               (GtkWidget *widget);
GtkSettings*        gtk_widget_get_settings             (GtkWidget *widget);
GtkClipboard *      gtk_widget_get_clipboard            (GtkWidget *widget,
                                                         GdkAtom selection);
GdkDisplay *        gtk_widget_get_display              (GtkWidget *widget);
GdkWindow *         gtk_widget_get_root_window          (GtkWidget *widget);
GdkScreen *         gtk_widget_get_screen               (GtkWidget *widget);
gboolean            gtk_widget_has_screen               (GtkWidget *widget);
void                gtk_widget_get_size_request         (GtkWidget *widget,
                                                         gint *width,
                                                         gint *height);
#define             gtk_widget_pop_visual               ()
#define             gtk_widget_push_visual              (visual)
void                gtk_widget_set_child_visible        (GtkWidget *widget,
                                                         gboolean is_visible);
#define             gtk_widget_set_default_visual       (visual)
void                gtk_widget_set_size_request         (GtkWidget *widget,
                                                         gint width,
                                                         gint height);
#define             gtk_widget_set_visual               (widget,visual)
void                gtk_widget_thaw_child_notify        (GtkWidget *widget);
void                gtk_widget_set_no_show_all          (GtkWidget *widget,
                                                         gboolean no_show_all);
gboolean            gtk_widget_get_no_show_all          (GtkWidget *widget);
GList*              gtk_widget_list_mnemonic_labels     (GtkWidget *widget);
void                gtk_widget_add_mnemonic_label       (GtkWidget *widget,
                                                         GtkWidget *label);
void                gtk_widget_remove_mnemonic_label    (GtkWidget *widget,
                                                         GtkWidget *label);
GtkAction *         gtk_widget_get_action               (GtkWidget *widget);
gboolean            gtk_widget_is_composited            (GtkWidget *widget);
void                gtk_widget_error_bell               (GtkWidget *widget);
gboolean            gtk_widget_keynav_failed            (GtkWidget *widget,
                                                         GtkDirectionType direction);
gchar *             gtk_widget_get_tooltip_markup       (GtkWidget *widget);
void                gtk_widget_set_tooltip_markup       (GtkWidget *widget,
                                                         const gchar *markup);
gchar *             gtk_widget_get_tooltip_text         (GtkWidget *widget);
void                gtk_widget_set_tooltip_text         (GtkWidget *widget,
                                                         const gchar *text);
GtkWindow *         gtk_widget_get_tooltip_window       (GtkWidget *widget);
void                gtk_widget_set_tooltip_window       (GtkWidget *widget,
                                                         GtkWindow *custom_window);
gboolean            gtk_widget_get_has_tooltip          (GtkWidget *widget);
void                gtk_widget_set_has_tooltip          (GtkWidget *widget,
                                                         gboolean has_tooltip);
void                gtk_widget_trigger_tooltip_query    (GtkWidget *widget);
GdkPixmap *         gtk_widget_get_snapshot             (GtkWidget *widget,
                                                         GdkRectangle *clip_rect);
GdkWindow*          gtk_widget_get_window               (GtkWidget *widget);

GtkRequisition *    gtk_requisition_copy                (const GtkRequisition *requisition);
void                gtk_requisition_free                (GtkRequisition *requisition);

Object Hierarchy

  GObject
   +----GInitiallyUnowned
         +----GtkObject
               +----GtkWidget
                     +----GtkContainer
                     +----GtkMisc
                     +----GtkCalendar
                     +----GtkCellView
                     +----GtkDrawingArea
                     +----GtkEntry
                     +----GtkRuler
                     +----GtkRange
                     +----GtkSeparator
                     +----GtkHSV
                     +----GtkInvisible
                     +----GtkOldEditable
                     +----GtkPreview
                     +----GtkProgress

Known Derived Interfaces

GtkWidget is required by GtkFileChooser, GtkCellEditable and GtkToolShell.

Implemented Interfaces

GtkWidget implements AtkImplementorIface and GtkBuildable.

Properties

  "app-paintable"            gboolean              : Read / Write
  "can-default"              gboolean              : Read / Write
  "can-focus"                gboolean              : Read / Write
  "composite-child"          gboolean              : Read
  "events"                   GdkEventMask          : Read / Write
  "extension-events"         GdkExtensionMode      : Read / Write
  "has-default"              gboolean              : Read / Write
  "has-focus"                gboolean              : Read / Write
  "has-tooltip"              gboolean              : Read / Write
  "height-request"           gint                  : Read / Write
  "is-focus"                 gboolean              : Read / Write
  "name"                     gchar*                : Read / Write
  "no-show-all"              gboolean              : Read / Write
  "parent"                   GtkContainer*         : Read / Write
  "receives-default"         gboolean              : Read / Write
  "sensitive"                gboolean              : Read / Write
  "style"                    GtkStyle*             : Read / Write
  "tooltip-markup"           gchar*                : Read / Write
  "tooltip-text"             gchar*                : Read / Write
  "visible"                  gboolean              : Read / Write
  "width-request"            gint                  : Read / Write
  "window"                   GdkWindow*            : Read

Signals

  "accel-closures-changed"                         
  "button-press-event"                             : Run Last
  "button-release-event"                           : Run Last
  "can-activate-accel"                             : Run Last
  "child-notify"                                   : Run First / No Recursion / Has Details / No Hooks
  "client-event"                                   : Run Last
  "composited-changed"                             : Run Last / Action
  "configure-event"                                : Run Last
  "damage-event"                                   : Run Last
  "delete-event"                                   : Run Last
  "destroy-event"                                  : Run Last
  "direction-changed"                              : Run First
  "drag-begin"                                     : Run Last
  "drag-data-delete"                               : Run Last
  "drag-data-get"                                  : Run Last
  "drag-data-received"                             : Run Last
  "drag-drop"                                      : Run Last
  "drag-end"                                       : Run Last
  "drag-failed"                                    : Run Last
  "drag-leave"                                     : Run Last
  "drag-motion"                                    : Run Last
  "enter-notify-event"                             : Run Last
  "event"                                          : Run Last
  "event-after"                                    
  "expose-event"                                   : Run Last
  "focus"                                          : Run Last
  "focus-in-event"                                 : Run Last
  "focus-out-event"                                : Run Last
  "grab-broken-event"                              : Run Last
  "grab-focus"                                     : Run Last / Action
  "grab-notify"                                    : Run First
  "hide"                                           : Run First
  "hierarchy-changed"                              : Run Last
  "key-press-event"                                : Run Last
  "key-release-event"                              : Run Last
  "keynav-failed"                                  : Run Last
  "leave-notify-event"                             : Run Last
  "map"                                            : Run First
  "map-event"                                      : Run Last
  "mnemonic-activate"                              : Run Last
  "motion-notify-event"                            : Run Last
  "move-focus"                                     : Run Last / Action
  "no-expose-event"                                : Run Last
  "parent-set"                                     : Run First
  "popup-menu"                                     : Run Last / Action
  "property-notify-event"                          : Run Last
  "proximity-in-event"                             : Run Last
  "proximity-out-event"                            : Run Last
  "query-tooltip"                                  : Run Last
  "realize"                                        : Run First
  "screen-changed"                                 : Run Last
  "scroll-event"                                   : Run Last
  "selection-clear-event"                          : Run Last
  "selection-get"                                  : Run Last
  "selection-notify-event"                         : Run Last
  "selection-received"                             : Run Last
  "selection-request-event"                        : Run Last
  "show"                                           : Run First
  "show-help"                                      : Run Last / Action
  "size-allocate"                                  : Run First
  "size-request"                                   : Run First
  "state-changed"                                  : Run First
  "style-set"                                      : Run First
  "unmap"                                          : Run First
  "unmap-event"                                    : Run Last
  "unrealize"                                      : Run Last
  "visibility-notify-event"                        : Run Last
  "window-state-event"                             : Run Last

Description

GtkWidget introduces style properties - these are basically object properties that are stored not on the object, but in the style object associated to the widget. Style properties are set in resource files. This mechanism is used for configuring such things as the location of the scrollbar arrows through the theme, giving theme authors more control over the look of applications without the need to write a theme engine in C.

Use gtk_widget_class_install_style_property() to install style properties for a widget class, gtk_widget_class_find_style_property() or gtk_widget_class_list_style_properties() to get information about existing style properties and gtk_widget_style_get_property(), gtk_widget_style_get() or gtk_widget_style_get_valist() to obtain the value of a style property.

GtkWidget as GtkBuildable

The GtkWidget implementation of the GtkBuildable interface supports a custom <accelerator> element, which has attributes named key, modifiers and signal and allows to specify accelerators.

Example 53. A UI definition fragment specifying an accelerator

<object class="GtkButton">
  <accelerator key="q" modifiers="GDK_CONTROL_MASK" signal="clicked"/>
</object>

In addition to accelerators, GtkWidget also support a custom <accessible> element, which supports actions and relations. Properties on the accessible implementation of an object can be set by accessing the internal child "accessible" of a GtkWidget.

Example 54. A UI definition fragment specifying an accessible

<object class="GtkButton" id="label1"/>
  <property name="label">I am a Label for a Button</property>
</object>
<object class="GtkButton" id="button1">
  <accessibility>
    <action action_name="click" translatable="yes">Click the button.</action>
    <relation target="label1" type="labelled-by"/>
  </accessibility>
  <child internal-child="accessible">
    <object class="AtkObject" id="a11y-button1">
      <property name="AtkObject::name">Clickable Button</property>
    </object>
  </child>
</object>

Details

GtkWidget

typedef struct {
  /* The style for the widget. The style contains the
   *  colors the widget should be drawn in for each state
   *  along with graphics contexts used to draw with and
   *  the font to use for text.
   */
  GtkStyle *GSEAL (style);
  
  /* The widget's desired size.
   */
  GtkRequisition GSEAL (requisition);
  
  /* The widget's allocated size.
   */
  GtkAllocation GSEAL (allocation);
  
  /* The widget's window or its parent window if it does
   *  not have a window. (Which will be indicated by the
   *  GTK_NO_WINDOW flag being set).
   */
  GdkWindow *GSEAL (window);
  
  /* The widget's parent.
   */
  GtkWidget *GSEAL (parent);
} GtkWidget;


GtkWidgetClass

typedef struct {
  /* The object class structure needs to be the first
   *  element in the widget class structure in order for
   *  the class mechanism to work correctly. This allows a
   *  GtkWidgetClass pointer to be cast to a GtkObjectClass
   *  pointer.
   */
  GtkObjectClass parent_class;

  
  guint activate_signal;

  guint set_scroll_adjustments_signal;
} GtkWidgetClass;

activate_signal The signal to emit when a widget of this class is activated, gtk_widget_activate() handles the emission. Implementation of this signal is optional.

set_scroll_adjustment_signal This signal is emitted when a widget of this class is added to a scrolling aware parent, gtk_widget_set_scroll_adjustments() handles the emission. Implementation of this signal is optional.


enum GtkWidgetFlags

typedef enum
{
  GTK_TOPLEVEL         = 1 << 4,
  GTK_NO_WINDOW        = 1 << 5,
  GTK_REALIZED         = 1 << 6,
  GTK_MAPPED           = 1 << 7,
  GTK_VISIBLE          = 1 << 8,
  GTK_SENSITIVE        = 1 << 9,
  GTK_PARENT_SENSITIVE = 1 << 10,
  GTK_CAN_FOCUS        = 1 << 11,
  GTK_HAS_FOCUS        = 1 << 12,

  /* widget is allowed to receive the default via gtk_widget_grab_default
   * and will reserve space to draw the default if possible
   */
  GTK_CAN_DEFAULT      = 1 << 13,

  /* the widget currently is receiving the default action and should be drawn
   * appropriately if possible
   */
  GTK_HAS_DEFAULT      = 1 << 14,

  GTK_HAS_GRAB	       = 1 << 15,
  GTK_RC_STYLE	       = 1 << 16,
  GTK_COMPOSITE_CHILD  = 1 << 17,
  GTK_NO_REPARENT      = 1 << 18,
  GTK_APP_PAINTABLE    = 1 << 19,

  /* the widget when focused will receive the default action and have
   * HAS_DEFAULT set even if there is a different widget set as default
   */
  GTK_RECEIVES_DEFAULT = 1 << 20,

  GTK_DOUBLE_BUFFERED  = 1 << 21,
  GTK_NO_SHOW_ALL      = 1 << 22
} GtkWidgetFlags;

Tells about certain properties of the widget.

GTK_TOPLEVEL

widgets without a real parent, as there are GtkWindows and GtkMenus have this flag set throughout their lifetime. Toplevel widgets always contain their own GdkWindow.

GTK_NO_WINDOW

Indicative for a widget that does not provide its own GdkWindow. Visible action (e.g. drawing) is performed on the parent's GdkWindow.

GTK_REALIZED

Set by gtk_widget_realize(), unset by gtk_widget_unrealize(). A realized widget has an associated GdkWindow.

GTK_MAPPED

Set by gtk_widget_map(), unset by gtk_widget_unmap(). Only realized widgets can be mapped. It means that gdk_window_show() has been called on the widgets window(s).

GTK_VISIBLE

Set by gtk_widget_show(), unset by gtk_widget_hide(). Implies that a widget will be mapped as soon as its parent is mapped.

GTK_SENSITIVE

Set and unset by gtk_widget_set_sensitive(). The sensitivity of a widget determines whether it will receive certain events (e.g. button or key presses). One premise for the widget's sensitivity is to have this flag set.

GTK_PARENT_SENSITIVE

Set and unset by gtk_widget_set_sensitive() operations on the parents of the widget. This is the second premise for the widget's sensitivity. Once it has GTK_SENSITIVE and GTK_PARENT_SENSITIVE set, its state is effectively sensitive. This is expressed (and can be examined) by the GTK_WIDGET_IS_SENSITIVE macro.

GTK_CAN_FOCUS

Determines whether a widget is able to handle focus grabs.

GTK_HAS_FOCUS

Set by gtk_widget_grab_focus() for widgets that also have GTK_CAN_FOCUS set. The flag will be unset once another widget grabs the focus.

GTK_CAN_DEFAULT

The widget is allowed to receive the default action via gtk_widget_grab_default().

GTK_HAS_DEFAULT

The widget currently is receiving the default action.

GTK_HAS_GRAB

Set by gtk_grab_add(), unset by gtk_grab_remove(). It means that the widget is in the grab_widgets stack, and will be the preferred one for receiving events other than ones of cosmetic value.

GTK_RC_STYLE

Indicates that the widget's style has been looked up through the rc mechanism. It does not imply that the widget actually had a style defined through the rc mechanism.

GTK_COMPOSITE_CHILD

Indicates that the widget is a composite child of its parent; see gtk_widget_push_composite_child(), gtk_widget_pop_composite_child().

GTK_NO_REPARENT

Unused since before GTK+ 1.2, will be removed in a future version.

GTK_APP_PAINTABLE

Set and unset by gtk_widget_set_app_paintable(). Must be set on widgets whose window the application directly draws on, in order to keep GTK+ from overwriting the drawn stuff. See the section called “App-paintable widgets” for a detailed description of this flag.

GTK_RECEIVES_DEFAULT

The widget when focused will receive the default action and have GTK_HAS_DEFAULT set even if there is a different widget set as default.

GTK_DOUBLE_BUFFERED

Set and unset by gtk_widget_set_double_buffered(). Indicates that exposes done on the widget should be double-buffered. See the section called “Double buffering” for a detailed discussion of how double-buffering works in GTK+ and why you may want to disable it for special cases.

GTK_NO_SHOW_ALL


GTK_WIDGET_TYPE()

#define GTK_WIDGET_TYPE(wid)		  (GTK_OBJECT_TYPE (wid))

Gets the type of a widget.

wid :

a GtkWidget.

GTK_WIDGET_STATE()

#define GTK_WIDGET_STATE(wid)		  (GTK_WIDGET (wid)->state)

Returns the current state of the widget, as a GtkStateType.

wid :

a GtkWidget.

GTK_WIDGET_SAVED_STATE()

#define GTK_WIDGET_SAVED_STATE(wid)	  (GTK_WIDGET (wid)->saved_state)

Returns the saved state of the widget, as a GtkStateType.

The saved state will be restored when a widget gets sensitive again, after it has been made insensitive with gtk_widget_set_state() or gtk_widget_set_sensitive().

wid :

a GtkWidget.

GTK_WIDGET_FLAGS()

#define GTK_WIDGET_FLAGS(wid)		  (GTK_OBJECT_FLAGS (wid))

Returns the widget flags from wid.

wid :

a GtkWidget.

GTK_WIDGET_TOPLEVEL()

#define GTK_WIDGET_TOPLEVEL(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_TOPLEVEL) != 0)

Evaluates to TRUE if the widget is a toplevel widget.

wid :

a GtkWidget.

GTK_WIDGET_NO_WINDOW()

#define GTK_WIDGET_NO_WINDOW(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_NO_WINDOW) != 0)

Evaluates to TRUE if the widget doesn't have an own GdkWindow.

wid :

a GtkWidget.

GTK_WIDGET_REALIZED()

#define GTK_WIDGET_REALIZED(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_REALIZED) != 0)

Evaluates to TRUE if the widget is realized.

wid :

a GtkWidget.

GTK_WIDGET_MAPPED()

#define GTK_WIDGET_MAPPED(wid)		  ((GTK_WIDGET_FLAGS (wid) & GTK_MAPPED) != 0)

Evaluates to TRUE if the widget is mapped.

wid :

a GtkWidget.

GTK_WIDGET_VISIBLE()

#define GTK_WIDGET_VISIBLE(wid)		  ((GTK_WIDGET_FLAGS (wid) & GTK_VISIBLE) != 0)

Evaluates to TRUE if the widget is visible.

wid :

a GtkWidget.

GTK_WIDGET_DRAWABLE()

#define GTK_WIDGET_DRAWABLE(wid)	  (GTK_WIDGET_VISIBLE (wid) && GTK_WIDGET_MAPPED (wid))

Evaluates to TRUE if the widget is mapped and visible.

wid :

a GtkWidget.

GTK_WIDGET_SENSITIVE()

#define GTK_WIDGET_SENSITIVE(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_SENSITIVE) != 0)

Evaluates to TRUE if the GTK_SENSITIVE flag has be set on the widget.

wid :

a GtkWidget.

GTK_WIDGET_PARENT_SENSITIVE()

#define GTK_WIDGET_PARENT_SENSITIVE(wid)  ((GTK_WIDGET_FLAGS (wid) & GTK_PARENT_SENSITIVE) != 0)

Evaluates to TRUE if the GTK_PARENT_SENSITIVE flag has be set on the widget.

wid :

a GtkWidget.

GTK_WIDGET_IS_SENSITIVE()

#define             GTK_WIDGET_IS_SENSITIVE(wid)

Evaluates to TRUE if the widget is effectively sensitive.

wid :

a GtkWidget.

GTK_WIDGET_CAN_FOCUS()

#define GTK_WIDGET_CAN_FOCUS(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_CAN_FOCUS) != 0)

Evaluates to TRUE if the widget is able to handle focus grabs.

wid :

a GtkWidget.

GTK_WIDGET_HAS_FOCUS()

#define GTK_WIDGET_HAS_FOCUS(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_HAS_FOCUS) != 0)

Evaluates to TRUE if the widget has grabbed the focus and no other widget has done so more recently.

wid :

a GtkWidget.

GTK_WIDGET_CAN_DEFAULT()

#define GTK_WIDGET_CAN_DEFAULT(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_CAN_DEFAULT) != 0)

Evaluates to TRUE if the widget is allowed to receive the default action via gtk_widget_grab_default().

wid :

a GtkWidget.

GTK_WIDGET_RECEIVES_DEFAULT()

#define GTK_WIDGET_RECEIVES_DEFAULT(wid)  ((GTK_WIDGET_FLAGS (wid) & GTK_RECEIVES_DEFAULT) != 0)

Evaluates to TRUE if the widget when focused will receive the default action even if there is a different widget set as default.

wid :

a GtkWidget.

GTK_WIDGET_HAS_DEFAULT()

#define GTK_WIDGET_HAS_DEFAULT(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_HAS_DEFAULT) != 0)

Evaluates to TRUE if the widget currently is receiving the default action.

wid :

a GtkWidget.

GTK_WIDGET_HAS_GRAB()

#define GTK_WIDGET_HAS_GRAB(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_HAS_GRAB) != 0)

Evaluates to TRUE if the widget is in the grab_widgets stack, and will be the preferred one for receiving events other than ones of cosmetic value.

wid :

a GtkWidget.

GTK_WIDGET_RC_STYLE()

#define GTK_WIDGET_RC_STYLE(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_RC_STYLE) != 0)

Evaluates to TRUE if the widget's style has been looked up through the rc mechanism.

wid :

a GtkWidget.

GTK_WIDGET_COMPOSITE_CHILD()

#define GTK_WIDGET_COMPOSITE_CHILD(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_COMPOSITE_CHILD) != 0)

Evaluates to TRUE if the widget is a composite child of its parent.

wid :

a GtkWidget.

GTK_WIDGET_APP_PAINTABLE()

#define GTK_WIDGET_APP_PAINTABLE(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_APP_PAINTABLE) != 0)

Evaluates to TRUE if the GTK_APP_PAINTABLE flag has been set on the widget.

wid :

a GtkWidget.

GTK_WIDGET_DOUBLE_BUFFERED()

#define GTK_WIDGET_DOUBLE_BUFFERED(wid)	  ((GTK_WIDGET_FLAGS (wid) & GTK_DOUBLE_BUFFERED) != 0)

Evaluates to TRUE if the GTK_DOUBLE_BUFFERED flag has been set on the widget.

wid :

a GtkWidget.

GTK_WIDGET_SET_FLAGS()

#define GTK_WIDGET_SET_FLAGS(wid,flag)	  G_STMT_START{ (GTK_WIDGET_FLAGS (wid) |= (flag)); }G_STMT_END

Turns on certain widget flags.

wid :

a GtkWidget.

flag :

the flags to set.

GTK_WIDGET_UNSET_FLAGS()

#define GTK_WIDGET_UNSET_FLAGS(wid,flag)  G_STMT_START{ (GTK_WIDGET_FLAGS (wid) &= ~(flag)); }G_STMT_END

Turns off certain widget flags.

wid :

a GtkWidget.

flag :

the flags to unset.

GtkCallback ()

void                (*GtkCallback)                      (GtkWidget *widget,
                                                         gpointer data);

The type of the callback functions used for e.g. iterating over the children of a container, see gtk_container_foreach().

widget :

the widget to operate on

data :

user-supplied data

GtkRequisition

typedef struct {
  gint width;
  gint height;
} GtkRequisition;

A GtkRequisition represents the desired size of a widget. See the section called “Size Requisition” for more information.

gint width;

the widget's desired width

gint height;

the widget's desired height

struct GtkAllocation

struct GtkAllocation {
  gint x;
  gint y;
  gint width;
  gint height;
};

A GtkAllocation of a widget represents region which has been allocated to the widget by its parent. It is a subregion of its parents allocation. See the section called “Size Allocation” for more information.

gint x;

the X position of the widget's area relative to its parents allocation.

gint y;

the Y position of the widget's area relative to its parents allocation.

gint width;

the width of the widget's allocated area.

gint height;

the height of the widget's allocated area.

GtkSelectionData

typedef struct {
  GdkAtom       GSEAL (selection);
  GdkAtom       GSEAL (target);
  GdkAtom       GSEAL (type);
  gint          GSEAL (format);
  guchar       *GSEAL (data);
  gint          GSEAL (length);
  GdkDisplay   *GSEAL (display);
} GtkSelectionData;


GtkWidgetAuxInfo

typedef struct {
  gint x;
  gint y;
  gint width;
  gint height;
  guint x_set : 1;
  guint y_set : 1;
} GtkWidgetAuxInfo;


GtkWidgetShapeInfo

typedef struct {
  gint16     offset_x;
  gint16     offset_y;
  GdkBitmap *shape_mask;
} GtkWidgetShapeInfo;


enum GtkWidgetHelpType

typedef enum
{
  GTK_WIDGET_HELP_TOOLTIP,
  GTK_WIDGET_HELP_WHATS_THIS
} GtkWidgetHelpType;


gtk_widget_new ()

GtkWidget*          gtk_widget_new                      (GType type,
                                                         const gchar *first_property_name,
                                                         ...);

This is a convenience function for creating a widget and setting its properties in one go. For example you might write: gtk_widget_new (GTK_TYPE_LABEL, "label", "Hello World", "xalign", 0.0, NULL) to create a left-aligned label. Equivalent to g_object_new(), but returns a widget so you don't have to cast the object yourself.

type :

type ID of the widget to create

first_property_name :

name of first property to set

... :

value of first property, followed by more properties, NULL-terminated

Returns :

a new GtkWidget of type widget_type

gtk_widget_ref ()

GtkWidget*          gtk_widget_ref                      (GtkWidget *widget);

Warning

gtk_widget_ref has been deprecated since version 2.12 and should not be used in newly-written code. Use g_object_ref() instead.

Adds a reference to a widget. This function is exactly the same as calling g_object_ref(), and exists mostly for historical reasons. It can still be convenient to avoid casting a widget to a GObject, it saves a small amount of typing.

widget :

a GtkWidget

Returns :

the widget that was referenced

gtk_widget_unref ()

void                gtk_widget_unref                    (GtkWidget *widget);

Warning

gtk_widget_unref has been deprecated since version 2.12 and should not be used in newly-written code. Use g_object_unref() instead.

Inverse of gtk_widget_ref(). Equivalent to g_object_unref().

widget :

a GtkWidget

gtk_widget_destroy ()

void                gtk_widget_destroy                  (GtkWidget *widget);

Destroys a widget. Equivalent to gtk_object_destroy(), except that you don't have to cast the widget to GtkObject. When a widget is destroyed, it will break any references it holds to other objects. If the widget is inside a container, the widget will be removed from the container. If the widget is a toplevel (derived from GtkWindow), it will be removed from the list of toplevels, and the reference GTK+ holds to it will be removed. Removing a widget from its container or the list of toplevels results in the widget being finalized, unless you've added additional references to the widget with g_object_ref().

In most cases, only toplevel widgets (windows) require explicit destruction, because when you destroy a toplevel its children will be destroyed as well.

widget :

a GtkWidget

gtk_widget_destroyed ()

void                gtk_widget_destroyed                (GtkWidget *widget,
                                                         GtkWidget **widget_pointer);

This function sets *widget_pointer to NULL if widget_pointer != NULL. It's intended to be used as a callback connected to the "destroy" signal of a widget. You connect gtk_widget_destroyed() as a signal handler, and pass the address of your widget variable as user data. Then when the widget is destroyed, the variable will be set to NULL. Useful for example to avoid multiple copies of the same dialog.

widget :

a GtkWidget

widget_pointer :

address of a variable that contains widget

gtk_widget_set ()

void                gtk_widget_set                      (GtkWidget *widget,
                                                         const gchar *first_property_name,
                                                         ...);

Warning

gtk_widget_set has been deprecated since version 2.0 and should not be used in newly-written code. Use g_object_set() instead.

Precursor of g_object_set().

widget :

a GtkWidget

first_property_name :

name of first property to set

... :

value of first property, followed by more properties, NULL-terminated

gtk_widget_unparent ()

void                gtk_widget_unparent                 (GtkWidget *widget);

This function is only for use in widget implementations. Should be called by implementations of the remove method on GtkContainer, to dissociate a child from the container.

widget :

a GtkWidget

gtk_widget_show ()

void                gtk_widget_show                     (GtkWidget *widget);

Flags a widget to be displayed. Any widget that isn't shown will not appear on the screen. If you want to show all the widgets in a container, it's easier to call gtk_widget_show_all() on the container, instead of individually showing the widgets.

Remember that you have to show the containers containing a widget, in addition to the widget itself, before it will appear onscreen.

When a toplevel container is shown, it is immediately realized and mapped; other shown widgets are realized and mapped when their toplevel container is realized and mapped.

widget :

a GtkWidget

gtk_widget_show_now ()

void                gtk_widget_show_now                 (GtkWidget *widget);

Shows a widget. If the widget is an unmapped toplevel widget (i.e. a GtkWindow that has not yet been shown), enter the main loop and wait for the window to actually be mapped. Be careful; because the main loop is running, anything can happen during this function.

widget :

a GtkWidget

gtk_widget_hide ()

void                gtk_widget_hide                     (GtkWidget *widget);

Reverses the effects of gtk_widget_show(), causing the widget to be hidden (invisible to the user).

widget :

a GtkWidget

gtk_widget_show_all ()

void                gtk_widget_show_all                 (GtkWidget *widget);

Recursively shows a widget, and any child widgets (if the widget is a container).

widget :

a GtkWidget

gtk_widget_hide_all ()

void                gtk_widget_hide_all                 (GtkWidget *widget);

Recursively hides a widget and any child widgets.

widget :

a GtkWidget

gtk_widget_map ()

void                gtk_widget_map                      (GtkWidget *widget);

This function is only for use in widget implementations. Causes a widget to be mapped if it isn't already.

widget :

a GtkWidget

gtk_widget_unmap ()

void                gtk_widget_unmap                    (GtkWidget *widget);

This function is only for use in widget implementations. Causes a widget to be unmapped if it's currently mapped.

widget :

a GtkWidget

gtk_widget_realize ()

void                gtk_widget_realize                  (GtkWidget *widget);

Creates the GDK (windowing system) resources associated with a widget. For example, widget->window will be created when a widget is realized. Normally realization happens implicitly; if you show a widget and all its parent containers, then the widget will be realized and mapped automatically.

Realizing a widget requires all the widget's parent widgets to be realized; calling gtk_widget_realize() realizes the widget's parents in addition to widget itself. If a widget is not yet inside a toplevel window when you realize it, bad things will happen.

This function is primarily used in widget implementations, and isn't very useful otherwise. Many times when you think you might need it, a better approach is to connect to a signal that will be called after the widget is realized automatically, such as GtkWidget::expose-event. Or simply g_signal_connect() to the GtkWidget::realize signal.

widget :

a GtkWidget

gtk_widget_unrealize ()

void                gtk_widget_unrealize                (GtkWidget *widget);

This function is only useful in widget implementations. Causes a widget to be unrealized (frees all GDK resources associated with the widget, such as widget->window).

widget :

a GtkWidget

gtk_widget_queue_draw ()

void                gtk_widget_queue_draw               (GtkWidget *widget);

Equivalent to calling gtk_widget_queue_draw_area() for the entire area of a widget.

widget :

a GtkWidget

gtk_widget_queue_resize ()

void                gtk_widget_queue_resize             (GtkWidget *widget);

This function is only for use in widget implementations. Flags a widget to have its size renegotiated; should be called when a widget for some reason has a new size request. For example, when you change the text in a GtkLabel, GtkLabel queues a resize to ensure there's enough space for the new text.

widget :

a GtkWidget

gtk_widget_queue_resize_no_redraw ()

void                gtk_widget_queue_resize_no_redraw   (GtkWidget *widget);

This function works like gtk_widget_queue_resize(), except that the widget is not invalidated.

widget :

a GtkWidget

Since 2.4


gtk_widget_draw ()

void                gtk_widget_draw                     (GtkWidget *widget,
                                                         const GdkRectangle *area);

Warning

gtk_widget_draw is deprecated and should not be used in newly-written code.

In GTK+ 1.2, this function would immediately render the region area of a widget, by invoking the virtual draw method of a widget. In GTK+ 2.0, the draw method is gone, and instead gtk_widget_draw() simply invalidates the specified region of the widget, then updates the invalid region of the widget immediately. Usually you don't want to update the region immediately for performance reasons, so in general gtk_widget_queue_draw_area() is a better choice if you want to draw a region of a widget.

widget :

a GtkWidget

area :

area to draw

gtk_widget_size_request ()

void                gtk_widget_size_request             (GtkWidget *widget,
                                                         GtkRequisition *requisition);

This function is typically used when implementing a GtkContainer subclass. Obtains the preferred size of a widget. The container uses this information to arrange its child widgets and decide what size allocations to give them with gtk_widget_size_allocate().

You can also call this function from an application, with some caveats. Most notably, getting a size request requires the widget to be associated with a screen, because font information may be needed. Multihead-aware applications should keep this in mind.

Also remember that the size request is not necessarily the size a widget will actually be allocated.

See also gtk_widget_get_child_requisition().

widget :

a GtkWidget

requisition :

a GtkRequisition to be filled in

gtk_widget_get_child_requisition ()

void                gtk_widget_get_child_requisition    (GtkWidget *widget,
                                                         GtkRequisition *requisition);

This function is only for use in widget implementations. Obtains widget->requisition, unless someone has forced a particular geometry on the widget (e.g. with gtk_widget_set_size_request()), in which case it returns that geometry instead of the widget's requisition.

This function differs from gtk_widget_size_request() in that it retrieves the last size request value from widget->requisition, while gtk_widget_size_request() actually calls the "size_request" method on widget to compute the size request and fill in widget->requisition, and only then returns widget->requisition.

Because this function does not call the "size_request" method, it can only be used when you know that widget->requisition is up-to-date, that is, gtk_widget_size_request() has been called since the last time a resize was queued. In general, only container implementations have this information; applications should use gtk_widget_size_request().

widget :

a GtkWidget

requisition :

a GtkRequisition to be filled in

gtk_widget_size_allocate ()

void                gtk_widget_size_allocate            (GtkWidget *widget,
                                                         GtkAllocation *allocation);

This function is only used by GtkContainer subclasses, to assign a size and position to their child widgets.

widget :

a GtkWidget

allocation :

position and size to be allocated to widget

gtk_widget_add_accelerator ()

void                gtk_widget_add_accelerator          (GtkWidget *widget,
                                                         const gchar *accel_signal,
                                                         GtkAccelGroup *accel_group,
                                                         guint accel_key,
                                                         GdkModifierType accel_mods,
                                                         GtkAccelFlags accel_flags);

Installs an accelerator for this widget in accel_group that causes accel_signal to be emitted if the accelerator is activated. The accel_group needs to be added to the widget's toplevel via gtk_window_add_accel_group(), and the signal must be of type G_RUN_ACTION. Accelerators added through this function are not user changeable during runtime. If you want to support accelerators that can be changed by the user, use gtk_accel_map_add_entry() and gtk_widget_set_accel_path() or gtk_menu_item_set_accel_path() instead.

widget :

widget to install an accelerator on

accel_signal :

widget signal to emit on accelerator activation

accel_group :

accel group for this widget, added to its toplevel

accel_key :

GDK keyval of the accelerator

accel_mods :

modifier key combination of the accelerator

accel_flags :

flag accelerators, e.g. GTK_ACCEL_VISIBLE

gtk_widget_remove_accelerator ()

gboolean            gtk_widget_remove_accelerator       (GtkWidget *widget,
                                                         GtkAccelGroup *accel_group,
                                                         guint accel_key,
                                                         GdkModifierType accel_mods);

Removes an accelerator from widget, previously installed with gtk_widget_add_accelerator().

widget :

widget to install an accelerator on

accel_group :

accel group for this widget

accel_key :

GDK keyval of the accelerator

accel_mods :

modifier key combination of the accelerator

Returns :

whether an accelerator was installed and could be removed

gtk_widget_set_accel_path ()

void                gtk_widget_set_accel_path           (GtkWidget *widget,
                                                         const gchar *accel_path,
                                                         GtkAccelGroup *accel_group);

Given an accelerator group, accel_group, and an accelerator path, accel_path, sets up an accelerator in accel_group so whenever the key binding that is defined for accel_path is pressed, widget will be activated. This removes any accelerators (for any accelerator group) installed by previous calls to gtk_widget_set_accel_path(). Associating accelerators with paths allows them to be modified by the user and the modifications to be saved for future use. (See gtk_accel_map_save().)

This function is a low level function that would most likely be used by a menu creation system like GtkUIManager. If you use GtkUIManager, setting up accelerator paths will be done automatically.

Even when you you aren't using GtkUIManager, if you only want to set up accelerators on menu items gtk_menu_item_set_accel_path() provides a somewhat more convenient interface.

Note that accel_path string will be stored in a GQuark. Therefore, if you pass a static string, you can save some memory by interning it first with g_intern_static_string().

widget :

a GtkWidget

accel_path :

path used to look up the accelerator

accel_group :

a GtkAccelGroup.

gtk_widget_list_accel_closures ()

GList*              gtk_widget_list_accel_closures      (GtkWidget *widget);

Lists the closures used by widget for accelerator group connections with gtk_accel_group_connect_by_path() or gtk_accel_group_connect(). The closures can be used to monitor accelerator changes on widget, by connecting to the GtkAccelGroup::accel-changed signal of the GtkAccelGroup of a closure which can be found out with gtk_accel_group_from_accel_closure().

widget :

widget to list accelerator closures for

Returns :

a newly allocated GList of closures

gtk_widget_can_activate_accel ()

gboolean            gtk_widget_can_activate_accel       (GtkWidget *widget,
                                                         guint signal_id);

Determines whether an accelerator that activates the signal identified by signal_id can currently be activated. This is done by emitting the "can-activate-accel" signal on widget; if the signal isn't overridden by a handler or in a derived widget, then the default check is that the widget must be sensitive, and the widget and all its ancestors mapped.

widget :

a GtkWidget

signal_id :

the ID of a signal installed on widget

Returns :

TRUE if the accelerator can be activated.

Since 2.4


gtk_widget_event ()

gboolean            gtk_widget_event                    (GtkWidget *widget,
                                                         GdkEvent *event);

Rarely-used function. This function is used to emit the event signals on a widget (those signals should never be emitted without using this function to do so). If you want to synthesize an event though, don't use this function; instead, use gtk_main_do_event() so the event will behave as if it were in the event queue. Don't synthesize expose events; instead, use gdk_window_invalidate_rect() to invalidate a region of the window.

widget :

a GtkWidget

event :

a GdkEvent

Returns :

return from the event signal emission (TRUE if the event was handled)

gtk_widget_activate ()

gboolean            gtk_widget_activate                 (GtkWidget *widget);

For widgets that can be "activated" (buttons, menu items, etc.) this function activates them. Activation is what happens when you press Enter on a widget during key navigation. If widget isn't activatable, the function returns FALSE.

widget :

a GtkWidget that's activatable

Returns :

TRUE if the widget was activatable

gtk_widget_reparent ()

void                gtk_widget_reparent                 (GtkWidget *widget,
                                                         GtkWidget *new_parent);

Moves a widget from one GtkContainer to another, handling reference count issues to avoid destroying the widget.

widget :

a GtkWidget

new_parent :

a GtkContainer to move the widget into

gtk_widget_intersect ()

gboolean            gtk_widget_intersect                (GtkWidget *widget,
                                                         const GdkRectangle *area,
                                                         GdkRectangle *intersection);

Computes the intersection of a widget's area and area, storing the intersection in intersection, and returns TRUE if there was an intersection. intersection may be NULL if you're only interested in whether there was an intersection.

widget :

a GtkWidget

area :

a rectangle

intersection :

rectangle to store intersection of widget and area

Returns :

TRUE if there was an intersection

gtk_widget_is_focus ()

gboolean            gtk_widget_is_focus                 (GtkWidget *widget);

Determines if the widget is the focus widget within its toplevel. (This does not mean that the HAS_FOCUS flag is necessarily set; HAS_FOCUS will only be set if the toplevel widget additionally has the global input focus.)

widget :

a GtkWidget

Returns :

TRUE if the widget is the focus widget.

gtk_widget_grab_focus ()

void                gtk_widget_grab_focus               (GtkWidget *widget);

Causes widget to have the keyboard focus for the GtkWindow it's inside. widget must be a focusable widget, such as a GtkEntry; something like GtkFrame won't work. (More precisely, it must have the GTK_CAN_FOCUS flag set.)

widget :

a GtkWidget

gtk_widget_grab_default ()

void                gtk_widget_grab_default             (GtkWidget *widget);

Causes widget to become the default widget. widget must have the GTK_CAN_DEFAULT flag set; typically you have to set this flag yourself by calling GTK_WIDGET_SET_FLAGS (widget, GTK_CAN_DEFAULT). The default widget is activated when the user presses Enter in a window. Default widgets must be activatable, that is, gtk_widget_activate() should affect them.

widget :

a GtkWidget

gtk_widget_set_name ()

void                gtk_widget_set_name                 (GtkWidget *widget,
                                                         const gchar *name);

Widgets can be named, which allows you to refer to them from a gtkrc file. You can apply a style to widgets with a particular name in the gtkrc file. See the documentation for gtkrc files (on the same page as the docs for GtkRcStyle).

Note that widget names are separated by periods in paths (see gtk_widget_path()), so names with embedded periods may cause confusion.

widget :

a GtkWidget

name :

name for the widget

gtk_widget_get_name ()

const gchar*        gtk_widget_get_name                 (GtkWidget *widget);

Retrieves the name of a widget. See gtk_widget_set_name() for the significance of widget names.

widget :

a GtkWidget

Returns :

name of the widget. This string is owned by GTK+ and should not be modified or freed

gtk_widget_set_state ()

void                gtk_widget_set_state                (GtkWidget *widget,
                                                         GtkStateType state);

This function is for use in widget implementations. Sets the state of a widget (insensitive, prelighted, etc.) Usually you should set the state using wrapper functions such as gtk_widget_set_sensitive().

widget :

a GtkWidget

state :

new state for widget

gtk_widget_set_sensitive ()

void                gtk_widget_set_sensitive            (GtkWidget *widget,
                                                         gboolean sensitive);

Sets the sensitivity of a widget. A widget is sensitive if the user can interact with it. Insensitive widgets are "grayed out" and the user can't interact with them. Insensitive widgets are known as "inactive", "disabled", or "ghosted" in some other toolkits.

widget :

a GtkWidget

sensitive :

TRUE to make the widget sensitive

gtk_widget_set_parent ()

void                gtk_widget_set_parent               (GtkWidget *widget,
                                                         GtkWidget *parent);

This function is useful only when implementing subclasses of GtkContainer. Sets the container as the parent of widget, and takes care of some details such as updating the state and style of the child to reflect its new location. The opposite function is gtk_widget_unparent().

widget :

a GtkWidget

parent :

parent container

gtk_widget_set_parent_window ()

void                gtk_widget_set_parent_window        (GtkWidget *widget,
                                                         GdkWindow *parent_window);

Sets a non default parent window for widget.

widget :

a GtkWidget.

parent_window :

the new parent window.

gtk_widget_get_parent_window ()

GdkWindow *         gtk_widget_get_parent_window        (GtkWidget *widget);

Gets widget's parent window.

widget :

a GtkWidget.

Returns :

the parent window of widget.

gtk_widget_set_uposition ()

void                gtk_widget_set_uposition            (GtkWidget *widget,
                                                         gint x,
                                                         gint y);

Warning

gtk_widget_set_uposition is deprecated and should not be used in newly-written code.

Sets the position of a widget. The funny "u" in the name comes from the "user position" hint specified by the X Window System, and exists for legacy reasons. This function doesn't work if a widget is inside a container; it's only really useful on GtkWindow.

Don't use this function to center dialogs over the main application window; most window managers will do the centering on your behalf if you call gtk_window_set_transient_for(), and it's really not possible to get the centering to work correctly in all cases from application code. But if you insist, use gtk_window_set_position() to set GTK_WIN_POS_CENTER_ON_PARENT, don't do the centering manually.

Note that although x and y can be individually unset, the position is not honoured unless both x and y are set.

widget :

a GtkWidget

x :

x position; -1 to unset x; -2 to leave x unchanged

y :

y position; -1 to unset y; -2 to leave y unchanged

gtk_widget_set_usize ()

void                gtk_widget_set_usize                (GtkWidget *widget,
                                                         gint width,
                                                         gint height);

Warning

gtk_widget_set_usize has been deprecated since version 2.2 and should not be used in newly-written code. Use gtk_widget_set_size_request() instead.

Sets the minimum size of a widget; that is, the widget's size request will be width by height. You can use this function to force a widget to be either larger or smaller than it is. The strange "usize" name dates from the early days of GTK+, and derives from X Window System terminology. In many cases, gtk_window_set_default_size() is a better choice for toplevel windows than this function; setting the default size will still allow users to shrink the window. Setting the usize will force them to leave the window at least as large as the usize. When dealing with window sizes, gtk_window_set_geometry_hints() can be a useful function as well.

Note the inherent danger of setting any fixed size - themes, translations into other languages, different fonts, and user action can all change the appropriate size for a given widget. So, it's basically impossible to hardcode a size that will always be correct.

widget :

a GtkWidget

width :

minimum width, or -1 to unset

height :

minimum height, or -1 to unset

gtk_widget_set_events ()

void                gtk_widget_set_events               (GtkWidget *widget,
                                                         gint events);

Sets the event mask (see GdkEventMask) for a widget. The event mask determines which events a widget will receive. Keep in mind that different widgets have different default event masks, and by changing the event mask you may disrupt a widget's functionality, so be careful. This function must be called while a widget is unrealized. Consider gtk_widget_add_events() for widgets that are already realized, or if you want to preserve the existing event mask. This function can't be used with GTK_NO_WINDOW widgets; to get events on those widgets, place them inside a GtkEventBox and receive events on the event box.

widget :

a GtkWidget

events :

event mask

gtk_widget_add_events ()

void                gtk_widget_add_events               (GtkWidget *widget,
                                                         gint events);

Adds the events in the bitfield events to the event mask for widget. See gtk_widget_set_events() for details.

widget :

a GtkWidget

events :

an event mask, see GdkEventMask

gtk_widget_set_extension_events ()

void                gtk_widget_set_extension_events     (GtkWidget *widget,
                                                         GdkExtensionMode mode);

Sets the extension events mask to mode. See GdkExtensionMode and gdk_input_set_extension_events().

widget :

a GtkWidget

mode :

bitfield of extension events to receive

gtk_widget_get_extension_events ()

GdkExtensionMode    gtk_widget_get_extension_events     (GtkWidget *widget);

Retrieves the extension events the widget will receive; see gdk_input_set_extension_events().

widget :

a GtkWidget

Returns :

extension events for widget

gtk_widget_get_toplevel ()

GtkWidget*          gtk_widget_get_toplevel             (GtkWidget *widget);

This function returns the topmost widget in the container hierarchy widget is a part of. If widget has no parent widgets, it will be returned as the topmost widget. No reference will be added to the returned widget; it should not be unreferenced.

Note the difference in behavior vs. gtk_widget_get_ancestor(); gtk_widget_get_ancestor (widget, GTK_TYPE_WINDOW) would return NULL if widget wasn't inside a toplevel window, and if the window was inside a GtkWindow-derived widget which was in turn inside the toplevel GtkWindow. While the second case may seem unlikely, it actually happens when a GtkPlug is embedded inside a GtkSocket within the same application.

To reliably find the toplevel GtkWindow, use gtk_widget_get_toplevel() and check if the TOPLEVEL flags is set on the result.

 GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
 if (GTK_WIDGET_TOPLEVEL (toplevel))
   {
     /* Perform action on toplevel. */
   }

widget :

a GtkWidget

Returns :

the topmost ancestor of widget, or widget itself if there's no ancestor.

gtk_widget_get_ancestor ()

GtkWidget*          gtk_widget_get_ancestor             (GtkWidget *widget,
                                                         GType widget_type);

Gets the first ancestor of widget with type widget_type. For example, gtk_widget_get_ancestor (widget, GTK_TYPE_BOX) gets the first GtkBox that's an ancestor of widget. No reference will be added to the returned widget; it should not be unreferenced. See note about checking for a toplevel GtkWindow in the docs for gtk_widget_get_toplevel().

Note that unlike gtk_widget_is_ancestor(), gtk_widget_get_ancestor() considers widget to be an ancestor of itself.

widget :

a GtkWidget

widget_type :

ancestor type

Returns :

the ancestor widget, or NULL if not found

gtk_widget_get_colormap ()

GdkColormap*        gtk_widget_get_colormap             (GtkWidget *widget);

Gets the colormap that will be used to render widget. No reference will be added to the returned colormap; it should not be unreferenced.

widget :

a GtkWidget

Returns :

the colormap used by widget

gtk_widget_set_colormap ()

void                gtk_widget_set_colormap             (GtkWidget *widget,
                                                         GdkColormap *colormap);

Sets the colormap for the widget to the given value. Widget must not have been previously realized. This probably should only be used from an init() function (i.e. from the constructor for the widget).

widget :

a GtkWidget

colormap :

a colormap

gtk_widget_get_visual ()

GdkVisual*          gtk_widget_get_visual               (GtkWidget *widget);

Gets the visual that will be used to render widget.

widget :

a GtkWidget

Returns :

the visual for widget

gtk_widget_get_events ()

gint                gtk_widget_get_events               (GtkWidget *widget);

Returns the event mask for the widget (a bitfield containing flags from the GdkEventMask enumeration). These are the events that the widget will receive.

widget :

a GtkWidget

Returns :

event mask for widget

gtk_widget_get_pointer ()

void                gtk_widget_get_pointer              (GtkWidget *widget,
                                                         gint *x,
                                                         gint *y);

Obtains the location of the mouse pointer in widget coordinates. Widget coordinates are a bit odd; for historical reasons, they are defined as widget->window coordinates for widgets that are not GTK_NO_WINDOW widgets, and are relative to widget->allocation.x, widget->allocation.y for widgets that are GTK_NO_WINDOW widgets.

widget :

a GtkWidget

x :

return location for the X coordinate, or NULL

y :

return location for the Y coordinate, or NULL

gtk_widget_is_ancestor ()

gboolean            gtk_widget_is_ancestor              (GtkWidget *widget,
                                                         GtkWidget *ancestor);

Determines whether widget is somewhere inside ancestor, possibly with intermediate containers.

widget :

a GtkWidget

ancestor :

another GtkWidget

Returns :

TRUE if ancestor contains widget as a child, grandchild, great grandchild, etc.

gtk_widget_translate_coordinates ()

gboolean            gtk_widget_translate_coordinates    (GtkWidget *src_widget,
                                                         GtkWidget *dest_widget,
                                                         gint src_x,
                                                         gint src_y,
                                                         gint *dest_x,
                                                         gint *dest_y);

Translate coordinates relative to src_widget's allocation to coordinates relative to dest_widget's allocations. In order to perform this operation, both widgets must be realized, and must share a common toplevel.

src_widget :

a GtkWidget

dest_widget :

a GtkWidget

src_x :

X position relative to src_widget

src_y :

Y position relative to src_widget

dest_x :

location to store X position relative to dest_widget

dest_y :

location to store Y position relative to dest_widget

Returns :

FALSE if either widget was not realized, or there was no common ancestor. In this case, nothing is stored in *dest_x and *dest_y. Otherwise TRUE.

gtk_widget_hide_on_delete ()

gboolean            gtk_widget_hide_on_delete           (GtkWidget *widget);

Utility function; intended to be connected to the "delete-event" signal on a GtkWindow. The function calls gtk_widget_hide() on its argument, then returns TRUE. If connected to ::delete-event, the result is that clicking the close button for a window (on the window frame, top right corner usually) will hide but not destroy the window. By default, GTK+ destroys windows when ::delete-event is received.

widget :

a GtkWidget

Returns :

TRUE

gtk_widget_set_style ()

void                gtk_widget_set_style                (GtkWidget *widget,
                                                         GtkStyle *style);

Sets the GtkStyle for a widget (widget->style). You probably don't want to use this function; it interacts badly with themes, because themes work by replacing the GtkStyle. Instead, use gtk_widget_modify_style().

widget :

a GtkWidget

style :

a GtkStyle, or NULL to remove the effect of a previous gtk_widget_set_style() and go back to the default style

gtk_widget_set_rc_style()

#define gtk_widget_set_rc_style(widget)          (gtk_widget_set_style (widget, NULL))

Warning

gtk_widget_set_rc_style is deprecated and should not be used in newly-written code. Use gtk_widget_set_style() with a NULL style argument instead.

Equivalent to gtk_widget_set_style (widget, NULL).

widget :

a GtkWidget.

gtk_widget_ensure_style ()

void                gtk_widget_ensure_style             (GtkWidget *widget);

Ensures that widget has a style (widget->style). Not a very useful function; most of the time, if you want the style, the widget is realized, and realized widgets are guaranteed to have a style already.

widget :

a GtkWidget

gtk_widget_get_style ()

GtkStyle*           gtk_widget_get_style                (GtkWidget *widget);

Simply an accessor function that returns widget->style.

widget :

a GtkWidget

Returns :

the widget's GtkStyle

gtk_widget_restore_default_style()

#define gtk_widget_restore_default_style(widget) (gtk_widget_set_style (widget, NULL))

Warning

gtk_widget_restore_default_style is deprecated and should not be used in newly-written code. Use gtk_widget_set_style() with a NULL style argument instead.

Equivalent to gtk_widget_set_style (widget, NULL).

widget :

a GtkWidget.

gtk_widget_reset_rc_styles ()

void                gtk_widget_reset_rc_styles          (GtkWidget *widget);

Reset the styles of widget and all descendents, so when they are looked up again, they get the correct values for the currently loaded RC file settings.

This function is not useful for applications.

widget :

a GtkWidget.

gtk_widget_push_colormap ()

void                gtk_widget_push_colormap            (GdkColormap *cmap);

Pushes cmap onto a global stack of colormaps; the topmost colormap on the stack will be used to create all widgets. Remove cmap with gtk_widget_pop_colormap(). There's little reason to use this function.

cmap :

a GdkColormap

gtk_widget_pop_colormap ()

void                gtk_widget_pop_colormap             (void);

Removes a colormap pushed with gtk_widget_push_colormap().


gtk_widget_set_default_colormap ()

void                gtk_widget_set_default_colormap     (GdkColormap *colormap);

Sets the default colormap to use when creating widgets. gtk_widget_push_colormap() is a better function to use if you only want to affect a few widgets, rather than all widgets.

colormap :

a GdkColormap

gtk_widget_get_default_style ()

GtkStyle*           gtk_widget_get_default_style        (void);

Returns the default style used by all widgets initially.

Returns :

the default style. This GtkStyle object is owned by GTK+ and should not be modified or freed.

gtk_widget_get_default_colormap ()

GdkColormap*        gtk_widget_get_default_colormap     (void);

Obtains the default colormap used to create widgets.

Returns :

default widget colormap

gtk_widget_get_default_visual ()

GdkVisual*          gtk_widget_get_default_visual       (void);

Obtains the visual of the default colormap. Not really useful; used to be useful before gdk_colormap_get_visual() existed.

Returns :

visual of the default colormap

gtk_widget_set_direction ()

void                gtk_widget_set_direction            (GtkWidget *widget,
                                                         GtkTextDirection dir);

Sets the reading direction on a particular widget. This direction controls the primary direction for widgets containing text, and also the direction in which the children of a container are packed. The ability to set the direction is present in order so that correct localization into languages with right-to-left reading directions can be done. Generally, applications will let the default reading direction present, except for containers where the containers are arranged in an order that is explicitely visual rather than logical (such as buttons for text justification).

If the direction is set to GTK_TEXT_DIR_NONE, then the value set by gtk_widget_set_default_direction() will be used.

widget :

a GtkWidget

dir :

the new direction

enum GtkTextDirection

typedef enum
{
  GTK_TEXT_DIR_NONE,
  GTK_TEXT_DIR_LTR,
  GTK_TEXT_DIR_RTL
} GtkTextDirection;


gtk_widget_get_direction ()

GtkTextDirection    gtk_widget_get_direction            (GtkWidget *widget);

Gets the reading direction for a particular widget. See gtk_widget_set_direction().

widget :

a GtkWidget

Returns :

the reading direction for the widget.

gtk_widget_set_default_direction ()

void                gtk_widget_set_default_direction    (GtkTextDirection dir);

Sets the default reading direction for widgets where the direction has not been explicitly set by gtk_widget_set_direction().

dir :

the new default direction. This cannot be GTK_TEXT_DIR_NONE.

gtk_widget_get_default_direction ()

GtkTextDirection    gtk_widget_get_default_direction    (void);

Obtains the current default reading direction. See gtk_widget_set_default_direction().

Returns :

the current default direction.

gtk_widget_shape_combine_mask ()

void                gtk_widget_shape_combine_mask       (GtkWidget *widget,
                                                         GdkBitmap *shape_mask,
                                                         gint offset_x,
                                                         gint offset_y);

Sets a shape for this widget's GDK window. This allows for transparent windows etc., see gdk_window_shape_combine_mask() for more information.

widget :

a GtkWidget

shape_mask :

shape to be added, or NULL to remove an existing shape

offset_x :

X position of shape mask with respect to window

offset_y :

Y position of shape mask with respect to window

gtk_widget_input_shape_combine_mask ()

void                gtk_widget_input_shape_combine_mask (GtkWidget *widget,
                                                         GdkBitmap *shape_mask,
                                                         gint offset_x,
                                                         gint offset_y);

Sets an input shape for this widget's GDK window. This allows for windows which react to mouse click in a nonrectangular region, see gdk_window_input_shape_combine_mask() for more information.

widget :

a GtkWidget

shape_mask :

shape to be added, or NULL to remove an existing shape

offset_x :

X position of shape mask with respect to window

offset_y :

Y position of shape mask with respect to window

Since 2.10


gtk_widget_path ()

void                gtk_widget_path                     (GtkWidget *widget,
                                                         guint *path_length,
                                                         gchar **path,
                                                         gchar **path_reversed);

Obtains the full path to widget. The path is simply the name of a widget and all its parents in the container hierarchy, separated by periods. The name of a widget comes from gtk_widget_get_name(). Paths are used to apply styles to a widget in gtkrc configuration files. Widget names are the type of the widget by default (e.g. "GtkButton") or can be set to an application-specific value with gtk_widget_set_name(). By setting the name of a widget, you allow users or theme authors to apply styles to that specific widget in their gtkrc file. path_reversed_p fills in the path in reverse order, i.e. starting with widget's name instead of starting with the name of widget's outermost ancestor.

widget :

a GtkWidget

path_length :

location to store length of the path, or NULL

path :

location to store allocated path string, or NULL

path_reversed :

location to store allocated reverse path string, or NULL

gtk_widget_class_path ()

void                gtk_widget_class_path               (GtkWidget *widget,
                                                         guint *path_length,
                                                         gchar **path,
                                                         gchar **path_reversed);

Same as gtk_widget_path(), but always uses the name of a widget's type, never uses a custom name set with gtk_widget_set_name().

widget :

a GtkWidget

path_length :

location to store the length of the class path, or NULL

path :

location to store the class path as an allocated string, or NULL

path_reversed :

location to store the reverse class path as an allocated string, or NULL

gtk_widget_get_composite_name ()

gchar*              gtk_widget_get_composite_name       (GtkWidget *widget);

Obtains the composite name of a widget.

widget :

a GtkWidget

Returns :

the composite name of widget, or NULL if widget is not a composite child. The string should be freed when it is no longer needed.

gtk_widget_modify_style ()

void                gtk_widget_modify_style             (GtkWidget *widget,
                                                         GtkRcStyle *style);

Modifies style values on the widget. Modifications made using this technique take precedence over style values set via an RC file, however, they will be overriden if a style is explicitely set on the widget using gtk_widget_set_style(). The GtkRcStyle structure is designed so each field can either be set or unset, so it is possible, using this function, to modify some style values and leave the others unchanged.

Note that modifications made with this function are not cumulative with previous calls to gtk_widget_modify_style() or with such functions as gtk_widget_modify_fg(). If you wish to retain previous values, you must first call gtk_widget_get_modifier_style(), make your modifications to the returned style, then call gtk_widget_modify_style() with that style. On the other hand, if you first call gtk_widget_modify_style(), subsequent calls to such functions gtk_widget_modify_fg() will have a cumulative effect with the initial modifications.

widget :

a GtkWidget

style :

the GtkRcStyle holding the style modifications

gtk_widget_get_modifier_style ()

GtkRcStyle *        gtk_widget_get_modifier_style       (GtkWidget *widget);

Returns the current modifier style for the widget. (As set by gtk_widget_modify_style().) If no style has previously set, a new GtkRcStyle will be created with all values unset, and set as the modifier style for the widget. If you make changes to this rc style, you must call gtk_widget_modify_style(), passing in the returned rc style, to make sure that your changes take effect.

Caution: passing the style back to gtk_widget_modify_style() will normally end up destroying it, because gtk_widget_modify_style() copies the passed-in style and sets the copy as the new modifier style, thus dropping any reference to the old modifier style. Add a reference to the modifier style if you want to keep it alive.

widget :

a GtkWidget

Returns :

the modifier style for the widget. This rc style is owned by the widget. If you want to keep a pointer to value this around, you must add a refcount using g_object_ref().

gtk_widget_modify_fg ()

void                gtk_widget_modify_fg                (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);

Sets the foreground color for a widget in a particular state. All other style values are left untouched. See also gtk_widget_modify_style().

widget :

a GtkWidget

state :

the state for which to set the foreground color

color :

the color to assign (does not need to be allocated), or NULL to undo the effect of previous calls to of gtk_widget_modify_fg().

gtk_widget_modify_bg ()

void                gtk_widget_modify_bg                (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);

Sets the background color for a widget in a particular state. All other style values are left untouched. See also gtk_widget_modify_style().

Note that "no window" widgets (which have the GTK_NO_WINDOW flag set) draw on their parent container's window and thus may not draw any background themselves. This is the case for e.g. GtkLabel. To modify the background of such widgets, you have to set the background color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a GtkEventBox widget and setting the background color on that.

widget :

a GtkWidget

state :

the state for which to set the background color

color :

the color to assign (does not need to be allocated), or NULL to undo the effect of previous calls to of gtk_widget_modify_bg().

gtk_widget_modify_text ()

void                gtk_widget_modify_text              (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);

Sets the text color for a widget in a particular state. All other style values are left untouched. The text color is the foreground color used along with the base color (see gtk_widget_modify_base()) for widgets such as GtkEntry and GtkTextView. See also gtk_widget_modify_style().

widget :

a GtkWidget

state :

the state for which to set the text color

color :

the color to assign (does not need to be allocated), or NULL to undo the effect of previous calls to of gtk_widget_modify_text().

gtk_widget_modify_base ()

void                gtk_widget_modify_base              (GtkWidget *widget,
                                                         GtkStateType state,
                                                         const GdkColor *color);

Sets the base color for a widget in a particular state. All other style values are left untouched. The base color is the background color used along with the text color (see gtk_widget_modify_text()) for widgets such as GtkEntry and GtkTextView. See also gtk_widget_modify_style().

Note that "no window" widgets (which have the GTK_NO_WINDOW flag set) draw on their parent container's window and thus may not draw any background themselves. This is the case for e.g. GtkLabel. To modify the background of such widgets, you have to set the base color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a GtkEventBox widget and setting the base color on that.

widget :

a GtkWidget

state :

the state for which to set the base color

color :

the color to assign (does not need to be allocated), or NULL to undo the effect of previous calls to of gtk_widget_modify_base().

gtk_widget_modify_font ()

void                gtk_widget_modify_font              (GtkWidget *widget,
                                                         PangoFontDescription *font_desc);

Sets the font to use for a widget. All other style values are left untouched. See also gtk_widget_modify_style().

widget :

a GtkWidget

font_desc :

the font description to use, or NULL to undo the effect of previous calls to gtk_widget_modify_font().

gtk_widget_modify_cursor ()

void                gtk_widget_modify_cursor            (GtkWidget *widget,
                                                         const GdkColor *primary,
                                                         const GdkColor *secondary);

Sets the cursor color to use in a widget, overriding the "cursor-color" and "secondary-cursor-color" style properties. All other style values are left untouched. See also gtk_widget_modify_style().

widget :

a GtkWidget

primary :

the color to use for primary cursor (does not need to be allocated), or NULL to undo the effect of previous calls to of gtk_widget_modify_cursor().

secondary :

the color to use for secondary cursor (does not need to be allocated), or NULL to undo the effect of previous calls to of gtk_widget_modify_cursor().

Since 2.12


gtk_widget_create_pango_context ()

PangoContext *      gtk_widget_create_pango_context     (GtkWidget *widget);

Creates a new PangoContext with the appropriate font map, font description, and base direction for drawing text for this widget. See also gtk_widget_get_pango_context().

widget :

a GtkWidget

Returns :

the new PangoContext

gtk_widget_get_pango_context ()

PangoContext *      gtk_widget_get_pango_context        (GtkWidget *widget);

Gets a PangoContext with the appropriate font map, font description, and base direction for this widget. Unlike the context returned by gtk_widget_create_pango_context(), this context is owned by the widget (it can be used until the screen for the widget changes or the widget is removed from its toplevel), and will be updated to match any changes to the widget's attributes.

If you create and keep a PangoLayout using this context, you must deal with changes to the context by calling pango_layout_context_changed() on the layout in response to the "style-set" and "direction-changed" signals for the widget.

widget :

a GtkWidget

Returns :

the PangoContext for the widget.

gtk_widget_create_pango_layout ()

PangoLayout *       gtk_widget_create_pango_layout      (GtkWidget *widget,
                                                         const gchar *text);

Creates a new PangoLayout with the appropriate font map, font description, and base direction for drawing text for this widget.

If you keep a PangoLayout created in this way around, in order to notify the layout of changes to the base direction or font of this widget, you must call pango_layout_context_changed() in response to the "style-set" and "direction-changed" signals for the widget.

widget :

a GtkWidget

text :

text to set on the layout (can be NULL)

Returns :

the new PangoLayout

gtk_widget_render_icon ()

GdkPixbuf *         gtk_widget_render_icon              (GtkWidget *widget,
                                                         const gchar *stock_id,
                                                         GtkIconSize size,
                                                         const gchar *detail);

A convenience function that uses the theme engine and RC file settings for widget to look up stock_id and render it to a pixbuf. stock_id should be a stock icon ID such as GTK_STOCK_OPEN or GTK_STOCK_OK. size should be a size such as GTK_ICON_SIZE_MENU. detail should be a string that identifies the widget or code doing the rendering, so that theme engines can special-case rendering for that widget or code.

The pixels in the returned GdkPixbuf are shared with the rest of the application and should not be modified. The pixbuf should be freed after use with g_object_unref().

widget :

a GtkWidget

stock_id :

a stock ID

size :

a stock size. A size of (GtkIconSize)-1 means render at the size of the source and don't scale (if there are multiple source sizes, GTK+ picks one of the available sizes).

detail :

render detail to pass to theme engine

Returns :

a new pixbuf, or NULL if the stock ID wasn't known

gtk_widget_pop_composite_child ()

void                gtk_widget_pop_composite_child      (void);

Cancels the effect of a previous call to gtk_widget_push_composite_child().


gtk_widget_push_composite_child ()

void                gtk_widget_push_composite_child     (void);

Makes all newly-created widgets as composite children until the corresponding gtk_widget_pop_composite_child() call.

A composite child is a child that's an implementation detail of the container it's inside and should not be visible to people using the container. Composite children aren't treated differently by GTK (but see gtk_container_foreach() vs. gtk_container_forall()), but e.g. GUI builders might want to treat them in a different way.

Here is a simple example:

  gtk_widget_push_composite_child ();
  scrolled_window->hscrollbar = gtk_hscrollbar_new (hadjustment);
  gtk_widget_set_composite_name (scrolled_window->hscrollbar, "hscrollbar");
  gtk_widget_pop_composite_child ();
  gtk_widget_set_parent (scrolled_window->hscrollbar, 
                         GTK_WIDGET (scrolled_window));
  g_object_ref (scrolled_window->hscrollbar);


gtk_widget_queue_clear ()

void                gtk_widget_queue_clear              (GtkWidget *widget);

Warning

gtk_widget_queue_clear has been deprecated since version 2.2 and should not be used in newly-written code. Use gtk_widget_queue_draw() instead.

This function does the same as gtk_widget_queue_draw().

widget :

a GtkWidget

gtk_widget_queue_clear_area ()

void                gtk_widget_queue_clear_area         (GtkWidget *widget,
                                                         gint x,
                                                         gint y,
                                                         gint width,
                                                         gint height);

Warning

gtk_widget_queue_clear_area has been deprecated since version 2.2 and should not be used in newly-written code. Use gtk_widget_queue_draw_area() instead.

This function is no longer different from gtk_widget_queue_draw_area(), though it once was. Now it just calls gtk_widget_queue_draw_area(). Originally gtk_widget_queue_clear_area() would force a redraw of the background for GTK_NO_WINDOW widgets, and gtk_widget_queue_draw_area() would not. Now both functions ensure the background will be redrawn.

widget :

a GtkWidget

x :

x coordinate of upper-left corner of rectangle to redraw

y :

y coordinate of upper-left corner of rectangle to redraw

width :

width of region to draw

height :

height of region to draw

gtk_widget_queue_draw_area ()

void                gtk_widget_queue_draw_area          (GtkWidget *widget,
                                                         gint x,
                                                         gint y,
                                                         gint width,
                                                         gint height);

Invalidates the rectangular area of widget defined by x, y, width and height by calling gdk_window_invalidate_rect() on the widget's window and all its child windows. Once the main loop becomes idle (after the current batch of events has been processed, roughly), the window will receive expose events for the union of all regions that have been invalidated.

Normally you would only use this function in widget implementations. You might also use it, or gdk_window_invalidate_rect() directly, to schedule a redraw of a GtkDrawingArea or some portion thereof.

Frequently you can just call gdk_window_invalidate_rect() or gdk_window_invalidate_region() instead of this function. Those functions will invalidate only a single window, instead of the widget and all its children.

The advantage of adding to the invalidated region compared to simply drawing immediately is efficiency; using an invalid region ensures that you only have to redraw one time.

widget :

a GtkWidget

x :

x coordinate of upper-left corner of rectangle to redraw

y :

y coordinate of upper-left corner of rectangle to redraw

width :

width of region to draw

height :

height of region to draw

gtk_widget_reset_shapes ()

void                gtk_widget_reset_shapes             (GtkWidget *widget);

Recursively resets the shape on this widget and its descendants.

widget :

a GtkWidget

gtk_widget_set_app_paintable ()

void                gtk_widget_set_app_paintable        (GtkWidget *widget,
                                                         gboolean app_paintable);

Sets whether the application intends to draw on the widget in an "expose-event" handler.

This is a hint to the widget and does not affect the behavior of the GTK+ core; many widgets ignore this flag entirely. For widgets that do pay attention to the flag, such as GtkEventBox and GtkWindow, the effect is to suppress default themed drawing of the widget's background. (Children of the widget will still be drawn.) The application is then entirely responsible for drawing the widget background.

Note that the background is still drawn when the widget is mapped. If this is not suitable (e.g. because you want to make a transparent window using an RGBA visual), you can work around this by doing:

 gtk_widget_realize (window);
 gdk_window_set_back_pixmap (window->window, NULL, FALSE);
 gtk_widget_show (window);

widget :

a GtkWidget

app_paintable :

TRUE if the application will paint on the widget

gtk_widget_set_double_buffered ()

void                gtk_widget_set_double_buffered      (GtkWidget *widget,
                                                         gboolean double_buffered);

Widgets are double buffered by default; you can use this function to turn off the buffering. "Double buffered" simply means that gdk_window_begin_paint_region() and gdk_window_end_paint() are called automatically around expose events sent to the widget. gdk_window_begin_paint() diverts all drawing to a widget's window to an offscreen buffer, and gdk_window_end_paint() draws the buffer to the screen. The result is that users see the window update in one smooth step, and don't see individual graphics primitives being rendered.

In very simple terms, double buffered widgets don't flicker, so you would only use this function to turn off double buffering if you had special needs and really knew what you were doing.

Note: if you turn off double-buffering, you have to handle expose events, since even the clearing to the background color or pixmap will not happen automatically (as it is done in gdk_window_begin_paint()).

widget :

a GtkWidget

double_buffered :

TRUE to double-buffer a widget

gtk_widget_set_redraw_on_allocate ()

void                gtk_widget_set_redraw_on_allocate   (GtkWidget *widget,
                                                         gboolean redraw_on_allocate);

Sets whether the entire widget is queued for drawing when its size allocation changes. By default, this setting is TRUE and the entire widget is redrawn on every size change. If your widget leaves the upper left unchanged when made bigger, turning this setting off will improve performance.

Note that for NO_WINDOW widgets setting this flag to FALSE turns off all allocation on resizing: the widget will not even redraw if its position changes; this is to allow containers that don't draw anything to avoid excess invalidations. If you set this flag on a NO_WINDOW widget that does draw on widget->window, you are responsible for invalidating both the old and new allocation of the widget when the widget is moved and responsible for invalidating regions newly when the widget increases size.

widget :

a GtkWidget

redraw_on_allocate :

if TRUE, the entire widget will be redrawn when it is allocated to a new size. Otherwise, only the new portion of the widget will be redrawn.

gtk_widget_set_composite_name ()

void                gtk_widget_set_composite_name       (GtkWidget *widget,
                                                         const gchar *name);

Sets a widgets composite name. The widget must be a composite child of its parent; see gtk_widget_push_composite_child().

widget :

a GtkWidget.

name :

the name to set

gtk_widget_set_scroll_adjustments ()

gboolean            gtk_widget_set_scroll_adjustments   (GtkWidget *widget,
                                                         GtkAdjustment *hadjustment,
                                                         GtkAdjustment *vadjustment);

For widgets that support scrolling, sets the scroll adjustments and returns TRUE. For widgets that don't support scrolling, does nothing and returns FALSE. Widgets that don't support scrolling can be scrolled by placing them in a GtkViewport, which does support scrolling.

widget :

a GtkWidget

hadjustment :

an adjustment for horizontal scrolling, or NULL

vadjustment :

an adjustment for vertical scrolling, or NULL

Returns :

TRUE if the widget supports scrolling

gtk_widget_mnemonic_activate ()

gboolean            gtk_widget_mnemonic_activate        (GtkWidget *widget,
                                                         gboolean group_cycling);

Emits the "mnemonic-activate" signal.

The default handler for this signal activates the widget if group_cycling is FALSE, and just grabs the focus if group_cycling is TRUE.

widget :

a GtkWidget

group_cycling :

TRUE if there are other widgets with the same mnemonic

Returns :

TRUE if the signal has been handled

gtk_widget_class_install_style_property ()

void                gtk_widget_class_install_style_property
                                                        (GtkWidgetClass *klass,
                                                         GParamSpec *pspec);

Installs a style property on a widget class. The parser for the style property is determined by the value type of pspec.

klass :

a GtkWidgetClass

pspec :

the GParamSpec for the property

gtk_widget_class_install_style_property_parser ()

void                gtk_widget_class_install_style_property_parser
                                                        (GtkWidgetClass *klass,
                                                         GParamSpec *pspec,
                                                         GtkRcPropertyParser parser);

Installs a style property on a widget class.

klass :

a GtkWidgetClass

pspec :

the GParamSpec for the style property

parser :

the parser for the style property

gtk_widget_class_find_style_property ()

GParamSpec*         gtk_widget_class_find_style_property
                                                        (GtkWidgetClass *klass,
                                                         const gchar *property_name);

Finds a style property of a widget class by name.

klass :

a GtkWidgetClass

property_name :

the name of the style property to find

Returns :

the GParamSpec of the style property or NULL if class has no style property with that name.

Since 2.2


gtk_widget_class_list_style_properties ()

GParamSpec**        gtk_widget_class_list_style_properties
                                                        (GtkWidgetClass *klass,
                                                         guint *n_properties);

Returns all style properties of a widget class.

klass :

a GtkWidgetClass

n_properties :

location to return the number of style properties found

Returns :

an newly allocated array of GParamSpec*. The array must be freed with g_free().

Since 2.2


gtk_widget_region_intersect ()

GdkRegion *         gtk_widget_region_intersect         (GtkWidget *widget,
                                                         const GdkRegion *region);

Computes the intersection of a widget's area and region, returning the intersection. The result may be empty, use gdk_region_empty() to check.

widget :

a GtkWidget

region :

a GdkRegion, in the same coordinate system as widget->allocation. That is, relative to widget->window for NO_WINDOW widgets; relative to the parent window of widget->window for widgets with their own window.

Returns :

A newly allocated region holding the intersection of widget and region. The coordinates of the return value are relative to widget->window for NO_WINDOW widgets, and relative to the parent window of widget->window for widgets with their own window.

gtk_widget_send_expose ()

gint                gtk_widget_send_expose              (GtkWidget *widget,
                                                         GdkEvent *event);

Very rarely-used function. This function is used to emit an expose event signals on a widget. This function is not normally used directly. The only time it is used is when propagating an expose event to a child NO_WINDOW widget, and that is normally done using gtk_container_propagate_expose().

If you want to force an area of a window to be redrawn, use gdk_window_invalidate_rect() or gdk_window_invalidate_region(). To cause the redraw to be done immediately, follow that call with a call to gdk_window_process_updates().

widget :

a GtkWidget

event :

a expose GdkEvent

Returns :

return from the event signal emission (TRUE if the event was handled)

gtk_widget_style_get ()

void                gtk_widget_style_get                (GtkWidget *widget,
                                                         const gchar *first_property_name,
                                                         ...);

Gets the values of a multiple style properties of widget.

widget :

a GtkWidget

first_property_name :

the name of the first property to get

... :

pairs of property names and locations to return the property values, starting with the location for first_property_name, terminated by NULL.

gtk_widget_style_get_property ()

void                gtk_widget_style_get_property       (GtkWidget *widget,
                                                         const gchar *property_name,
                                                         GValue *value);

Gets the value of a style property of widget.

widget :

a GtkWidget

property_name :

the name of a style property

value :

location to return the property value

gtk_widget_style_get_valist ()

void                gtk_widget_style_get_valist         (GtkWidget *widget,
                                                         const gchar *first_property_name,
                                                         va_list var_args);

Non-vararg variant of gtk_widget_style_get(). Used primarily by language bindings.

widget :

a GtkWidget

first_property_name :

the name of the first property to get

var_args :

a va_list of pairs of property names and locations to return the property values, starting with the location for first_property_name.

gtk_widget_get_accessible ()

AtkObject*          gtk_widget_get_accessible           (GtkWidget *widget);

Returns the accessible object that describes the widget to an assistive technology.

If no accessibility library is loaded (i.e. no ATK implementation library is loaded via GTK_MODULES or via another application library, such as libgnome), then this AtkObject instance may be a no-op. Likewise, if no class-specific AtkObject implementation is available for the widget instance in question, it will inherit an AtkObject implementation from the first ancestor class for which such an implementation is defined.

The documentation of the ATK library contains more information about accessible objects and their uses.

widget :

a GtkWidget

Returns :

the AtkObject associated with widget

gtk_widget_child_focus ()

gboolean            gtk_widget_child_focus              (GtkWidget *widget,
                                                         GtkDirectionType direction);

This function is used by custom widget implementations; if you're writing an app, you'd use gtk_widget_grab_focus() to move the focus to a particular widget, and gtk_container_set_focus_chain() to change the focus tab order. So you may want to investigate those functions instead.

gtk_widget_child_focus() is called by containers as the user moves around the window using keyboard shortcuts. direction indicates what kind of motion is taking place (up, down, left, right, tab forward, tab backward). gtk_widget_child_focus() emits the "focus"" signal; widgets override the default handler for this signal in order to implement appropriate focus behavior.

The default ::focus handler for a widget should return TRUE if moving in direction left the focus on a focusable location inside that widget, and FALSE if moving in direction moved the focus outside the widget. If returning TRUE, widgets normally call gtk_widget_grab_focus() to place the focus accordingly; if returning FALSE, they don't modify the current focus location.

This function replaces gtk_container_focus() from GTK+ 1.2. It was necessary to check that the child was visible, sensitive, and focusable before calling gtk_container_focus(). gtk_widget_child_focus() returns FALSE if the widget is not currently in a focusable state, so there's no need for those checks.

widget :

a GtkWidget

direction :

direction of focus movement

Returns :

TRUE if focus ended up inside widget

gtk_widget_child_notify ()

void                gtk_widget_child_notify             (GtkWidget *widget,
                                                         const gchar *child_property);

Emits a "child-notify" signal for the child property child_property on widget.

This is the analogue of g_object_notify() for child properties.

widget :

a GtkWidget

child_property :

the name of a child property installed on the class of widget's parent

gtk_widget_freeze_child_notify ()

void                gtk_widget_freeze_child_notify      (GtkWidget *widget);

Stops emission of "child-notify" signals on widget. The signals are queued until gtk_widget_thaw_child_notify() is called on widget.

This is the analogue of g_object_freeze_notify() for child properties.

widget :

a GtkWidget

gtk_widget_get_child_visible ()

gboolean            gtk_widget_get_child_visible        (GtkWidget *widget);

Gets the value set with gtk_widget_set_child_visible(). If you feel a need to use this function, your code probably needs reorganization.

This function is only useful for container implementations and never should be called by an application.

widget :

a GtkWidget

Returns :

TRUE if the widget is mapped with the parent.

gtk_widget_get_parent ()

GtkWidget *         gtk_widget_get_parent               (GtkWidget *widget);

Returns the parent container of widget.

widget :

a GtkWidget

Returns :

the parent container of widget, or NULL

gtk_widget_get_settings ()

GtkSettings*        gtk_widget_get_settings             (GtkWidget *widget);

Gets the settings object holding the settings (global property settings, RC file information, etc) used for this widget.

Note that this function can only be called when the GtkWidget is attached to a toplevel, since the settings object is specific to a particular GdkScreen.

widget :

a GtkWidget

Returns :

the relevant GtkSettings object

gtk_widget_get_clipboard ()

GtkClipboard *      gtk_widget_get_clipboard            (GtkWidget *widget,
                                                         GdkAtom selection);

Returns the clipboard object for the given selection to be used with widget. widget must have a GdkDisplay associated with it, so must be attached to a toplevel window.

widget :

a GtkWidget

selection :

a GdkAtom which identifies the clipboard to use. GDK_SELECTION_CLIPBOARD gives the default clipboard. Another common value is GDK_SELECTION_PRIMARY, which gives the primary X selection.

Returns :

the appropriate clipboard object. If no clipboard already exists, a new one will be created. Once a clipboard object has been created, it is persistent for all time.

Since 2.2


gtk_widget_get_display ()

GdkDisplay *        gtk_widget_get_display              (GtkWidget *widget);

Get the GdkDisplay for the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a GtkWindow at the top.

In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.

widget :

a GtkWidget

Returns :

the GdkDisplay for the toplevel for this widget.

Since 2.2


gtk_widget_get_root_window ()

GdkWindow *         gtk_widget_get_root_window          (GtkWidget *widget);

Get the root window where this widget is located. This function can only be called after the widget has been added to a widget hierarchy with GtkWindow at the top.

The root window is useful for such purposes as creating a popup GdkWindow associated with the window. In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.

widget :

a GtkWidget

Returns :

the GdkWindow root window for the toplevel for this widget.

Since 2.2


gtk_widget_get_screen ()

GdkScreen *         gtk_widget_get_screen               (GtkWidget *widget);

Get the GdkScreen from the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a GtkWindow at the top.

In general, you should only create screen specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.

widget :

a GtkWidget

Returns :

the GdkScreen for the toplevel for this widget.

Since 2.2


gtk_widget_has_screen ()

gboolean            gtk_widget_has_screen               (GtkWidget *widget);

Checks whether there is a GdkScreen is associated with this widget. All toplevel widgets have an associated screen, and all widgets added into a hierarchy with a toplevel window at the top.

widget :

a GtkWidget

Returns :

TRUE if there is a GdkScreen associcated with the widget.

Since 2.2


gtk_widget_get_size_request ()

void                gtk_widget_get_size_request         (GtkWidget *widget,
                                                         gint *width,
                                                         gint *height);

Gets the size request that was explicitly set for the widget using gtk_widget_set_size_request(). A value of -1 stored in width or height indicates that that dimension has not been set explicitly and the natural requisition of the widget will be used intead. See gtk_widget_set_size_request(). To get the size a widget will actually use, call gtk_widget_size_request() instead of this function.

widget :

a GtkWidget

width :

return location for width, or NULL

height :

return location for height, or NULL

gtk_widget_pop_visual()

#define gtk_widget_pop_visual()               ((void) 0)

Warning

gtk_widget_pop_visual is deprecated and should not be used in newly-written code.

This function is deprecated; it does nothing.


gtk_widget_push_visual()

#define gtk_widget_push_visual(visual)        ((void) 0)

Warning

gtk_widget_push_visual is deprecated and should not be used in newly-written code.

This function is deprecated; it does nothing.

visual :

a visual

gtk_widget_set_child_visible ()

void                gtk_widget_set_child_visible        (GtkWidget *widget,
                                                         gboolean is_visible);

Sets whether widget should be mapped along with its when its parent is mapped and widget has been shown with gtk_widget_show().

The child visibility can be set for widget before it is added to a container with gtk_widget_set_parent(), to avoid mapping children unnecessary before immediately unmapping them. However it will be reset to its default state of TRUE when the widget is removed from a container.

Note that changing the child visibility of a widget does not queue a resize on the widget. Most of the time, the size of a widget is computed from all visible children, whether or not they are mapped. If this is not the case, the container can queue a resize itself.

This function is only useful for container implementations and never should be called by an application.

widget :

a GtkWidget

is_visible :

if TRUE, widget should be mapped along with its parent.

gtk_widget_set_default_visual()

#define gtk_widget_set_default_visual(visual) ((void) 0)

Warning

gtk_widget_set_default_visual is deprecated and should not be used in newly-written code.

This function is deprecated; it does nothing.

visual :

a visual

gtk_widget_set_size_request ()

void                gtk_widget_set_size_request         (GtkWidget *widget,
                                                         gint width,
                                                         gint height);

Sets the minimum size of a widget; that is, the widget's size request will be width by height. You can use this function to force a widget to be either larger or smaller than it normally would be.

In most cases, gtk_window_set_default_size() is a better choice for toplevel windows than this function; setting the default size will still allow users to shrink the window. Setting the size request will force them to leave the window at least as large as the size request. When dealing with window sizes, gtk_window_set_geometry_hints() can be a useful function as well.

Note the inherent danger of setting any fixed size - themes, translations into other languages, different fonts, and user action can all change the appropriate size for a given widget. So, it's basically impossible to hardcode a size that will always be correct.

The size request of a widget is the smallest size a widget can accept while still functioning well and drawing itself correctly. However in some strange cases a widget may be allocated less than its requested size, and in many cases a widget may be allocated more space than it requested.

If the size request in a given direction is -1 (unset), then the "natural" size request of the widget will be used instead.

Widgets can't actually be allocated a size less than 1 by 1, but you can pass 0,0 to this function to mean "as small as possible."

widget :

a GtkWidget

width :

width widget should request, or -1 to unset

height :

height widget should request, or -1 to unset

gtk_widget_set_visual()

#define gtk_widget_set_visual(widget,visual)  ((void) 0)

Warning

gtk_widget_set_visual is deprecated and should not be used in newly-written code.

This function is deprecated; it does nothing.

widget :

a GtkWidget

visual :

a visual

gtk_widget_thaw_child_notify ()

void                gtk_widget_thaw_child_notify        (GtkWidget *widget);

Reverts the effect of a previous call to gtk_widget_freeze_child_notify(). This causes all queued "child-notify" signals on widget to be emitted.

widget :

a GtkWidget

gtk_widget_set_no_show_all ()

void                gtk_widget_set_no_show_all          (GtkWidget *widget,
                                                         gboolean no_show_all);

Sets the "no-show-all" property, which determines whether calls to gtk_widget_show_all() and gtk_widget_hide_all() will affect this widget.

This is mostly for use in constructing widget hierarchies with externally controlled visibility, see GtkUIManager.

widget :

a GtkWidget

no_show_all :

the new value for the "no-show-all" property

Since 2.4


gtk_widget_get_no_show_all ()

gboolean            gtk_widget_get_no_show_all          (GtkWidget *widget);

Returns the current value of the GtkWidget:no-show-all property, which determines whether calls to gtk_widget_show_all() and gtk_widget_hide_all() will affect this widget.

widget :

a GtkWidget

Returns :

the current value of the "no-show-all" property.

Since 2.4


gtk_widget_list_mnemonic_labels ()

GList*              gtk_widget_list_mnemonic_labels     (GtkWidget *widget);

Returns a newly allocated list of the widgets, normally labels, for which this widget is a the target of a mnemonic (see for example, gtk_label_set_mnemonic_widget()).

The widgets in the list are not individually referenced. If you want to iterate through the list and perform actions involving callbacks that might destroy the widgets, you must call g_list_foreach (result, (GFunc)g_object_ref, NULL) first, and then unref all the widgets afterwards.

widget :

a GtkWidget

Returns :

the list of mnemonic labels; free this list with g_list_free() when you are done with it.

Since 2.4


gtk_widget_add_mnemonic_label ()

void                gtk_widget_add_mnemonic_label       (GtkWidget *widget,
                                                         GtkWidget *label);

Adds a widget to the list of mnemonic labels for this widget. (See gtk_widget_list_mnemonic_labels()). Note the list of mnemonic labels for the widget is cleared when the widget is destroyed, so the caller must make sure to update its internal state at this point as well, by using a connection to the "destroy" signal or a weak notifier.

widget :

a GtkWidget

label :

a GtkWidget that acts as a mnemonic label for widget

Since 2.4


gtk_widget_remove_mnemonic_label ()

void                gtk_widget_remove_mnemonic_label    (GtkWidget *widget,
                                                         GtkWidget *label);

Removes a widget from the list of mnemonic labels for this widget. (See gtk_widget_list_mnemonic_labels()). The widget must have previously been added to the list with gtk_widget_add_mnemonic_label().

widget :

a GtkWidget

label :

a GtkWidget that was previously set as a mnemnic label for widget with gtk_widget_add_mnemonic_label().

Since 2.4


gtk_widget_get_action ()

GtkAction *         gtk_widget_get_action               (GtkWidget *widget);

Warning

gtk_widget_get_action has been deprecated since version 2.16 and should not be used in newly-written code. Use gtk_activatable_get_related_action() instead.

Returns the GtkAction that widget is a proxy for. See also gtk_action_get_proxies().

widget :

a GtkWidget

Returns :

the action that a widget is a proxy for, or NULL, if it is not attached to an action.

Since 2.10


gtk_widget_is_composited ()

gboolean            gtk_widget_is_composited            (GtkWidget *widget);

Whether widget can rely on having its alpha channel drawn correctly. On X11 this function returns whether a compositing manager is running for widget's screen.

Please note that the semantics of this call will change in the future if used on a widget that has a composited window in its hierarchy (as set by gdk_window_set_composited()).

widget :

a GtkWidget

Returns :

TRUE if the widget can rely on its alpha channel being drawn correctly.

Since 2.10


gtk_widget_error_bell ()

void                gtk_widget_error_bell               (GtkWidget *widget);

Notifies the user about an input-related error on this widget. If the "gtk-error-bell" setting is TRUE, it calls gdk_window_beep(), otherwise it does nothing.

Note that the effect of gdk_window_beep() can be configured in many ways, depending on the windowing backend and the desktop environment or window manager that is used.

widget :

a GtkWidget

Since 2.12


gtk_widget_keynav_failed ()

gboolean            gtk_widget_keynav_failed            (GtkWidget *widget,
                                                         GtkDirectionType direction);

This function should be called whenever keyboard navigation within a single widget hits a boundary. The function emits the "keynav-failed" signal on the widget and its return value should be interpreted in a way similar to the return value of gtk_widget_child_focus():

When TRUE is returned, stay in the widget, the failed keyboard navigation is Ok and/or there is nowhere we can/should move the focus to.

When FALSE is returned, the caller should continue with keyboard navigation outside the widget, e.g. by calling gtk_widget_child_focus() on the widget's toplevel.

The default ::keynav-failed handler returns TRUE for GTK_DIR_TAB_FORWARD and GTK_DIR_TAB_BACKWARD. For the other values of GtkDirectionType, it looks at the "gtk-keynav-cursor-only" setting and returns FALSE if the setting is TRUE. This way the entire user interface becomes cursor-navigatable on input devices such as mobile phones which only have cursor keys but no tab key.

Whenever the default handler returns TRUE, it also calls gtk_widget_error_bell() to notify the user of the failed keyboard navigation.

A use case for providing an own implementation of ::keynav-failed (either by connecting to it or by overriding it) would be a row of GtkEntry widgets where the user should be able to navigate the entire row with the cursor keys, as e.g. known from user interfaces that require entering license keys.

widget :

a GtkWidget

direction :

direction of focus movement

Returns :

TRUE if stopping keyboard navigation is fine, FALSE if the emitting widget should try to handle the keyboard navigation attempt in its parent container(s).

Since 2.12


gtk_widget_get_tooltip_markup ()

gchar *             gtk_widget_get_tooltip_markup       (GtkWidget *widget);

Gets the contents of the tooltip for widget.

widget :

a GtkWidget

Returns :

the tooltip text, or NULL. You should free the returned string with g_free() when done.

Since 2.12


gtk_widget_set_tooltip_markup ()

void                gtk_widget_set_tooltip_markup       (GtkWidget *widget,
                                                         const gchar *markup);

Sets markup as the contents of the tooltip, which is marked up with the Pango text markup language.

This function will take care of setting GtkWidget:has-tooltip to TRUE and of the default handler for the GtkWidget::query-tooltip signal.

See also the GtkWidget:tooltip-markup property and gtk_tooltip_set_markup().

widget :

a GtkWidget

markup :

the contents of the tooltip for widget, or NULL

Since 2.12


gtk_widget_get_tooltip_text ()

gchar *             gtk_widget_get_tooltip_text         (GtkWidget *widget);

Gets the contents of the tooltip for widget.

widget :

a GtkWidget

Returns :

the tooltip text, or NULL. You should free the returned string with g_free() when done.

Since 2.12


gtk_widget_set_tooltip_text ()

void                gtk_widget_set_tooltip_text         (GtkWidget *widget,
                                                         const gchar *text);

Sets text as the contents of the tooltip. This function will take care of setting GtkWidget:has-tooltip to TRUE and of the default handler for the GtkWidget::query-tooltip signal.

See also the GtkWidget:tooltip-text property and gtk_tooltip_set_text().

widget :

a GtkWidget

text :

the contents of the tooltip for widget

Since 2.12


gtk_widget_get_tooltip_window ()

GtkWindow *         gtk_widget_get_tooltip_window       (GtkWidget *widget);

Returns the GtkWindow of the current tooltip. This can be the GtkWindow created by default, or the custom tooltip window set using gtk_widget_set_tooltip_window().

widget :

a GtkWidget

Returns :

The GtkWindow of the current tooltip.

Since 2.12


gtk_widget_set_tooltip_window ()

void                gtk_widget_set_tooltip_window       (GtkWidget *widget,
                                                         GtkWindow *custom_window);

Replaces the default, usually yellow, window used for displaying tooltips with custom_window. GTK+ will take care of showing and hiding custom_window at the right moment, to behave likewise as the default tooltip window. If custom_window is NULL, the default tooltip window will be used.

widget :

a GtkWidget

custom_window :

a GtkWindow, or NULL

Since 2.12


gtk_widget_get_has_tooltip ()

gboolean            gtk_widget_get_has_tooltip          (GtkWidget *widget);

Returns the current value of the has-tooltip property. See GtkWidget:has-tooltip for more information.

widget :

a GtkWidget

Returns :

current value of has-tooltip on widget.

Since 2.12


gtk_widget_set_has_tooltip ()

void                gtk_widget_set_has_tooltip          (GtkWidget *widget,
                                                         gboolean has_tooltip);

Sets the has-tooltip property on widget to has_tooltip. See GtkWidget:has-tooltip for more information.

widget :

a GtkWidget

has_tooltip :

whether or not widget has a tooltip.

Since 2.12


gtk_widget_trigger_tooltip_query ()

void                gtk_widget_trigger_tooltip_query    (GtkWidget *widget);

Triggers a tooltip query on the display where the toplevel of widget is located. See gtk_tooltip_trigger_tooltip_query() for more information.

widget :

a GtkWidget

Since 2.12


gtk_widget_get_snapshot ()

GdkPixmap *         gtk_widget_get_snapshot             (GtkWidget *widget,
                                                         GdkRectangle *clip_rect);

Create a GdkPixmap of the contents of the widget and its children.

Works even if the widget is obscured. The depth and visual of the resulting pixmap is dependent on the widget being snapshot and likely differs from those of a target widget displaying the pixmap. The function gdk_pixbuf_get_from_drawable() can be used to convert the pixmap to a visual independant representation.

The snapshot area used by this function is the widget's allocation plus any extra space occupied by additional windows belonging to this widget (such as the arrows of a spin button). Thus, the resulting snapshot pixmap is possibly larger than the allocation.

If clip_rect is non-NULL, the resulting pixmap is shrunken to match the specified clip_rect. The (x,y) coordinates of clip_rect are interpreted widget relative. If width or height of clip_rect are 0 or negative, the width or height of the resulting pixmap will be shrunken by the respective amount. For instance a clip_rect { +5, +5, -10, -10 } will chop off 5 pixels at each side of the snapshot pixmap. If non-NULL, clip_rect will contain the exact widget-relative snapshot coordinates upon return. A clip_rect of { -1, -1, 0, 0 } can be used to preserve the auto-grown snapshot area and use clip_rect as a pure output parameter.

The returned pixmap can be NULL, if the resulting clip_area was empty.

widget :

a GtkWidget

clip_rect :

a GdkRectangle or NULL

Returns :

GdkPixmap snapshot of the widget

Since 2.14


gtk_widget_get_window ()

GdkWindow*          gtk_widget_get_window               (GtkWidget *widget);

Returns the widget's window if it is realized, NULL otherwise

widget :

a GtkWidget

Returns :

widget's window.

Since 2.14


gtk_requisition_copy ()

GtkRequisition *    gtk_requisition_copy                (const GtkRequisition *requisition);

Copies a GtkRequisition.

requisition :

a GtkRequisition

Returns :

a copy of requisition

gtk_requisition_free ()

void                gtk_requisition_free                (GtkRequisition *requisition);

Frees a GtkRequisition.

requisition :

a GtkRequisition

Property Details

The "app-paintable" property

  "app-paintable"            gboolean              : Read / Write

Whether the application will paint directly on the widget.

Default value: FALSE


The "can-default" property

  "can-default"              gboolean              : Read / Write

Whether the widget can be the default widget.

Default value: FALSE


The "can-focus" property

  "can-focus"                gboolean              : Read / Write

Whether the widget can accept the input focus.

Default value: FALSE


The "composite-child" property

  "composite-child"          gboolean              : Read

Whether the widget is part of a composite widget.

Default value: FALSE


The "events" property

  "events"                   GdkEventMask          : Read / Write

The event mask that decides what kind of GdkEvents this widget gets.

Default value: GDK_STRUCTURE_MASK


The "extension-events" property

  "extension-events"         GdkExtensionMode      : Read / Write

The mask that decides what kind of extension events this widget gets.

Default value: GDK_EXTENSION_EVENTS_NONE


The "has-default" property

  "has-default"              gboolean              : Read / Write

Whether the widget is the default widget.

Default value: FALSE


The "has-focus" property

  "has-focus"                gboolean              : Read / Write

Whether the widget has the input focus.

Default value: FALSE


The "has-tooltip" property

  "has-tooltip"              gboolean              : Read / Write

Enables or disables the emission of "query-tooltip" on widget. A value of TRUE indicates that widget can have a tooltip, in this case the widget will be queried using "query-tooltip" to determine whether it will provide a tooltip or not.

Note that setting this property to TRUE for the first time will change the event masks of the GdkWindows of this widget to include leave-notify and motion-notify events. This cannot and will not be undone when the property is set to FALSE again.

Default value: FALSE

Since 2.12


The "height-request" property

  "height-request"           gint                  : Read / Write

Override for height request of the widget, or -1 if natural request should be used.

Allowed values: >= G_MAXULONG

Default value: -1


The "is-focus" property

  "is-focus"                 gboolean              : Read / Write

Whether the widget is the focus widget within the toplevel.

Default value: FALSE


The "name" property

  "name"                     gchar*                : Read / Write

The name of the widget.

Default value: NULL


The "no-show-all" property

  "no-show-all"              gboolean              : Read / Write

Whether gtk_widget_show_all() should not affect this widget.

Default value: FALSE


The "parent" property

  "parent"                   GtkContainer*         : Read / Write

The parent widget of this widget. Must be a Container widget.


The "receives-default" property

  "receives-default"         gboolean              : Read / Write

If TRUE, the widget will receive the default action when it is focused.

Default value: FALSE


The "sensitive" property

  "sensitive"                gboolean              : Read / Write

Whether the widget responds to input.

Default value: TRUE


The "style" property

  "style"                    GtkStyle*             : Read / Write

The style of the widget, which contains information about how it will look (colors etc).


The "tooltip-markup" property

  "tooltip-markup"           gchar*                : Read / Write

Sets the text of tooltip to be the given string, which is marked up with the Pango text markup language. Also see gtk_tooltip_set_markup().

This is a convenience property which will take care of getting the tooltip shown if the given string is not NULL: "has-tooltip" will automatically be set to TRUE and there will be taken care of "query-tooltip" in the default signal handler.

Default value: NULL

Since 2.12


The "tooltip-text" property

  "tooltip-text"             gchar*                : Read / Write

Sets the text of tooltip to be the given string.

Also see gtk_tooltip_set_text().

This is a convenience property which will take care of getting the tooltip shown if the given string is not NULL: "has-tooltip" will automatically be set to TRUE and there will be taken care of "query-tooltip" in the default signal handler.

Default value: NULL

Since 2.12


The "visible" property

  "visible"                  gboolean              : Read / Write

Whether the widget is visible.

Default value: FALSE


The "width-request" property

  "width-request"            gint                  : Read / Write

Override for width request of the widget, or -1 if natural request should be used.

Allowed values: >= G_MAXULONG

Default value: -1


The "window" property

  "window"                   GdkWindow*            : Read

The widget's window if it is realized, NULL otherwise.

Since 2.14

Style Property Details

The "cursor-aspect-ratio" style property

  "cursor-aspect-ratio"      gfloat                : Read

Aspect ratio with which to draw insertion cursor.

Allowed values: [0,1]

Default value: 0.04


The "cursor-color" style property

  "cursor-color"             GdkColor*             : Read

Color with which to draw insertion cursor.


The "draw-border" style property

  "draw-border"              GtkBorder*            : Read

The "draw-border" style property defines the size of areas outside the widget's allocation to draw.

Since 2.8


The "focus-line-pattern" style property

  "focus-line-pattern"       gchar*                : Read

Dash pattern used to draw the focus indicator.

Default value: "\001\001"


The "focus-line-width" style property

  "focus-line-width"         gint                  : Read

Width, in pixels, of the focus indicator line.

Allowed values: >= 0

Default value: 1


The "focus-padding" style property

  "focus-padding"            gint                  : Read

Width, in pixels, between focus indicator and the widget 'box'.

Allowed values: >= 0

Default value: 1


The "interior-focus" style property

  "interior-focus"           gboolean              : Read

Whether to draw the focus indicator inside widgets.

Default value: TRUE


The "link-color" style property

  "link-color"               GdkColor*             : Read

The "link-color" style property defines the color of unvisited links.

Since 2.10


The "scroll-arrow-hlength" style property

  "scroll-arrow-hlength"     gint                  : Read

The "scroll-arrow-hlength" style property defines the length of horizontal scroll arrows.

Allowed values: >= 1

Default value: 16

Since 2.10


The "scroll-arrow-vlength" style property

  "scroll-arrow-vlength"     gint                  : Read

The "scroll-arrow-vlength" style property defines the length of vertical scroll arrows.

Allowed values: >= 1

Default value: 16

Since 2.10


The "secondary-cursor-color" style property

  "secondary-cursor-color"   GdkColor*             : Read

Color with which to draw the secondary insertion cursor when editing mixed right-to-left and left-to-right text.


The "separator-height" style property

  "separator-height"         gint                  : Read

The "separator-height" style property defines the height of separators. This property only takes effect if "wide-separators" is TRUE.

Allowed values: >= 0

Default value: 0

Since 2.10


The "separator-width" style property

  "separator-width"          gint                  : Read

The "separator-width" style property defines the width of separators. This property only takes effect if "wide-separators" is TRUE.

Allowed values: >= 0

Default value: 0

Since 2.10


The "visited-link-color" style property

  "visited-link-color"       GdkColor*             : Read

The "visited-link-color" style property defines the color of visited links.

Since 2.10


The "wide-separators" style property

  "wide-separators"          gboolean              : Read

The "wide-separators" style property defines whether separators have configurable width and should be drawn using a box instead of a line.

Default value: FALSE

Since 2.10

Signal Details

The "accel-closures-changed" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "button-press-event" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkEventButton *event,
                                                        gpointer        user_data)      : Run Last

The ::button-press-event signal will be emitted when a button (typically from a mouse) is pressed.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_BUTTON_PRESS_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal.

event :

the GdkEventButton which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "button-release-event" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkEventButton *event,
                                                        gpointer        user_data)      : Run Last

The ::button-release-event signal will be emitted when a button (typically from a mouse) is released.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_BUTTON_RELEASE_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal.

event :

the GdkEventButton which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "can-activate-accel" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        guint      signal_id,
                                                        gpointer   user_data)      : Run Last

Determines whether an accelerator that activates the signal identified by signal_id can currently be activated. This signal is present to allow applications and derived widgets to override the default GtkWidget handling for determining whether an accelerator can be activated.

widget :

the object which received the signal

signal_id :

the ID of a signal installed on widget

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if the signal can be activated.

The "child-notify" signal

void                user_function                      (GtkWidget  *widget,
                                                        GParamSpec *pspec,
                                                        gpointer    user_data)      : Run First / No Recursion / Has Details / No Hooks

The ::child-notify signal is emitted for each child property that has changed on an object. The signal's detail holds the property name.

widget :

the object which received the signal

pspec :

the GParamSpec of the changed child property

user_data :

user data set when the signal handler was connected.

The "client-event" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkEventClient *event,
                                                        gpointer        user_data)      : Run Last

The ::client-event will be emitted when the widget's window receives a message (via a ClientMessage event) from another application.

widget :

the object which received the signal

event :

the GdkEventClient which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "composited-changed" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run Last / Action

The ::composited-changed signal is emitted when the composited status of widgets screen changes. See gdk_screen_is_composited().

widget :

the object on which the signal is emitted

user_data :

user data set when the signal handler was connected.

The "configure-event" signal

gboolean            user_function                      (GtkWidget         *widget,
                                                        GdkEventConfigure *event,
                                                        gpointer           user_data)      : Run Last

The ::configure-event signal will be emitted when the size, position or stacking of the widget's window has changed.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

widget :

the object which received the signal

event :

the GdkEventConfigure which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "damage-event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

Emitted when a redirected window belonging to widget gets drawn into. The region/area members of the event shows what area of the redirected drawable was drawn into.

widget :

the object which received the signal

event :

the GdkEventExpose event

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

Since 2.14


The "delete-event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

The ::delete-event signal is emitted if a user requests that a toplevel window is closed. The default handler for this signal destroys the window. Connecting gtk_widget_hide_on_delete() to this signal will cause the window to be hidden instead, so that it can later be shown again without reconstructing it.

widget :

the object which received the signal

event :

the event which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "destroy-event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

The ::destroy-event signal is emitted when a GdkWindow is destroyed. You rarely get this signal, because most widgets disconnect themselves from their window before they destroy it, so no widget owns the window at destroy time.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

widget :

the object which received the signal.

event :

the event which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "direction-changed" signal

void                user_function                      (GtkWidget       *widget,
                                                        GtkTextDirection previous_direction,
                                                        gpointer         user_data)               : Run First

The ::direction-changed signal is emitted when the text direction of a widget changes.

widget :

the object on which the signal is emitted

previous_direction :

the previous text direction of widget

user_data :

user data set when the signal handler was connected.

The "drag-begin" signal

void                user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        gpointer        user_data)         : Run Last

The ::drag-begin signal is emitted on the drag source when a drag is started. A typical reason to connect to this signal is to set up a custom drag icon with gtk_drag_source_set_icon().

Note that some widgets set up a drag icon in the default handler of this signal, so you may have to use g_signal_connect_after() to override what the default handler did.

widget :

the object which received the signal

drag_context :

the drag context

user_data :

user data set when the signal handler was connected.

The "drag-data-delete" signal

void                user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        gpointer        user_data)         : Run Last

The ::drag-data-delete signal is emitted on the drag source when a drag with the action GDK_ACTION_MOVE is successfully completed. The signal handler is responsible for deleting the data that has been dropped. What "delete" means depends on the context of the drag operation.

widget :

the object which received the signal

drag_context :

the drag context

user_data :

user data set when the signal handler was connected.

The "drag-data-get" signal

void                user_function                      (GtkWidget        *widget,
                                                        GdkDragContext   *drag_context,
                                                        GtkSelectionData *data,
                                                        guint             info,
                                                        guint             time,
                                                        gpointer          user_data)         : Run Last

The ::drag-data-get signal is emitted on the drag source when the drop site requests the data which is dragged. It is the responsibility of the signal handler to fill data with the data in the format which is indicated by info. See gtk_selection_data_set() and gtk_selection_data_set_text().

widget :

the object which received the signal

drag_context :

the drag context

data :

the GtkSelectionData to be filled with the dragged data

info :

the info that has been registered with the target in the GtkTargetList

time :

the timestamp at which the data was requested

user_data :

user data set when the signal handler was connected.

The "drag-data-received" signal

void                user_function                      (GtkWidget        *widget,
                                                        GdkDragContext   *drag_context,
                                                        gint              x,
                                                        gint              y,
                                                        GtkSelectionData *data,
                                                        guint             info,
                                                        guint             time,
                                                        gpointer          user_data)         : Run Last

The ::drag-data-received signal is emitted on the drop site when the dragged data has been received. If the data was received in order to determine whether the drop will be accepted, the handler is expected to call gdk_drag_status() and not finish the drag. If the data was received in response to a "drag-drop" signal (and this is the last target to be received), the handler for this signal is expected to process the received data and then call gtk_drag_finish(), setting the success parameter depending on whether the data was processed successfully.

The handler may inspect and modify drag_context->action before calling gtk_drag_finish(), e.g. to implement GDK_ACTION_ASK as shown in the following example:

void  
drag_data_received (GtkWidget          *widget,
                    GdkDragContext     *drag_context,
                    gint                x,
                    gint                y,
                    GtkSelectionData   *data,
                    guint               info,
                    guint               time)
{
  if ((data->length >= 0) && (data->format == 8))
    {
      if (drag_context->action == GDK_ACTION_ASK) 
        {
          GtkWidget *dialog;
          gint response;
          
          dialog = gtk_message_dialog_new (NULL,
                                           GTK_DIALOG_MODAL | 
                                           GTK_DIALOG_DESTROY_WITH_PARENT,
                                           GTK_MESSAGE_INFO,
                                           GTK_BUTTONS_YES_NO,
                                           "Move the data ?\n");
          response = gtk_dialog_run (GTK_DIALOG (dialog));
          gtk_widget_destroy (dialog);
            
          if (response == GTK_RESPONSE_YES)
            drag_context->action = GDK_ACTION_MOVE;
          else
            drag_context->action = GDK_ACTION_COPY;
         }
         
      gtk_drag_finish (drag_context, TRUE, FALSE, time);
      return;
    }
      
   gtk_drag_finish (drag_context, FALSE, FALSE, time);
 }

widget :

the object which received the signal

drag_context :

the drag context

x :

where the drop happened

y :

where the drop happened

data :

the received data

info :

the info that has been registered with the target in the GtkTargetList

time :

the timestamp at which the data was received

user_data :

user data set when the signal handler was connected.

The "drag-drop" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        gint            x,
                                                        gint            y,
                                                        guint           time,
                                                        gpointer        user_data)         : Run Last

The ::drag-drop signal is emitted on the drop site when the user drops the data onto the widget. The signal handler must determine whether the cursor position is in a drop zone or not. If it is not in a drop zone, it returns FALSE and no further processing is necessary. Otherwise, the handler returns TRUE. In this case, the handler must ensure that gtk_drag_finish() is called to let the source know that the drop is done. The call to gtk_drag_finish() can be done either directly or in a "drag-data-received" handler which gets triggered by calling gtk_drag_get_data() to receive the data for one or more of the supported targets.

widget :

the object which received the signal

drag_context :

the drag context

x :

the x coordinate of the current cursor position

y :

the y coordinate of the current cursor position

time :

the timestamp of the motion event

returns :

whether the cursor position is in a drop zone

user_data :

user data set when the signal handler was connected.

The "drag-end" signal

void                user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        gpointer        user_data)         : Run Last

The ::drag-end signal is emitted on the drag source when a drag is finished. A typical reason to connect to this signal is to undo things done in "drag-begin".

widget :

the object which received the signal

drag_context :

the drag context

user_data :

user data set when the signal handler was connected.

The "drag-failed" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        GtkDragResult   result,
                                                        gpointer        user_data)         : Run Last

The ::drag-failed signal is emitted on the drag source when a drag has failed. The signal handler may hook custom code to handle a failed DND operation based on the type of error, it returns TRUE is the failure has been already handled (not showing the default "drag operation failed" animation), otherwise it returns FALSE.

widget :

the object which received the signal

drag_context :

the drag context

result :

the result of the drag operation

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if the failed drag operation has been already handled.

Since 2.12


The "drag-leave" signal

void                user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        guint           time,
                                                        gpointer        user_data)         : Run Last

The ::drag-leave signal is emitted on the drop site when the cursor leaves the widget. A typical reason to connect to this signal is to undo things done in "drag-motion", e.g. undo highlighting with gtk_drag_unhighlight()

widget :

the object which received the signal.

drag_context :

the drag context

time :

the timestamp of the motion event

user_data :

user data set when the signal handler was connected.

The "drag-motion" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkDragContext *drag_context,
                                                        gint            x,
                                                        gint            y,
                                                        guint           time,
                                                        gpointer        user_data)         : Run Last

The drag-motion signal is emitted on the drop site when the user moves the cursor over the widget during a drag. The signal handler must determine whether the cursor position is in a drop zone or not. If it is not in a drop zone, it returns FALSE and no further processing is necessary. Otherwise, the handler returns TRUE. In this case, the handler is responsible for providing the necessary information for displaying feedback to the user, by calling gdk_drag_status().

If the decision whether the drop will be accepted or rejected can't be made based solely on the cursor position and the type of the data, the handler may inspect the dragged data by calling gtk_drag_get_data() and defer the gdk_drag_status() call to the "drag-data-received" handler. Note that you cannot not pass GTK_DEST_DEFAULT_DROP, GTK_DEST_DEFAULT_MOTION or GTK_DEST_DEFAULT_ALL to gtk_drag_dest_set() when using the drag-motion signal that way.

Also note that there is no drag-enter signal. The drag receiver has to keep track of whether he has received any drag-motion signals since the last "drag-leave" and if not, treat the drag-motion signal as an "enter" signal. Upon an "enter", the handler will typically highlight the drop site with gtk_drag_highlight().

static void
drag_motion (GtkWidget *widget,
             GdkDragContext *context,
             gint x,
             gint y,
             guint time)
{
  GdkAtom target;
 
  PrivateData *private_data = GET_PRIVATE_DATA (widget);
 
  if (!private_data->drag_highlight) 
   {
     private_data->drag_highlight = 1;
     gtk_drag_highlight (widget);
   }
 
  target = gtk_drag_dest_find_target (widget, context, NULL);
  if (target == GDK_NONE)
    gdk_drag_status (context, 0, time);
  else 
   {
     private_data->pending_status = context->suggested_action;
     gtk_drag_get_data (widget, context, target, time);
   }
 
  return TRUE;
}
  
static void
drag_data_received (GtkWidget        *widget,
                    GdkDragContext   *context,
                    gint              x,
                    gint              y,
                    GtkSelectionData *selection_data,
                    guint             info,
                    guint             time)
{
  PrivateData *private_data = GET_PRIVATE_DATA (widget);
  
  if (private_data->suggested_action) 
   {
     private_data->suggested_action = 0;
     
    /* We are getting this data due to a request in drag_motion,
     * rather than due to a request in drag_drop, so we are just
     * supposed to call gdk_drag_status (), not actually paste in 
     * the data.
     */
     str = gtk_selection_data_get_text (selection_data);
     if (!data_is_acceptable (str)) 
       gdk_drag_status (context, 0, time);
     else
       gdk_drag_status (context, private_data->suggested_action, time);
   }
  else
   {
     /* accept the drop */
   }
}

widget :

the object which received the signal

drag_context :

the drag context

x :

the x coordinate of the current cursor position

y :

the y coordinate of the current cursor position

time :

the timestamp of the motion event

returns :

whether the cursor position is in a drop zone

user_data :

user data set when the signal handler was connected.

The "enter-notify-event" signal

gboolean            user_function                      (GtkWidget        *widget,
                                                        GdkEventCrossing *event,
                                                        gpointer          user_data)      : Run Last

The ::enter-notify-event will be emitted when the pointer enters the widget's window.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_ENTER_NOTIFY_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal

event :

the GdkEventCrossing which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

The GTK+ main loop will emit three signals for each GDK event delivered to a widget: one generic ::event signal, another, more specific, signal that matches the type of event delivered (e.g. "key-press-event") and finally a generic "event-after" signal.

widget :

the object which received the signal.

event :

the GdkEvent which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event and to cancel the emission of the second specific ::event signal. FALSE to propagate the event further and to allow the emission of the second signal. The ::event-after signal is emitted regardless of the return value.

The "event-after" signal

void                user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)

After the emission of the "event" signal and (optionally) the second more specific signal, ::event-after will be emitted regardless of the previous two signals handlers return values.

widget :

the object which received the signal.

event :

the GdkEvent which triggered this signal

user_data :

user data set when the signal handler was connected.

The "expose-event" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkEventExpose *event,
                                                        gpointer        user_data)      : Run Last

The ::expose-event signal is emitted when an area of a previously obscured GdkWindow is made visible and needs to be redrawn. GTK_NO_WINDOW widgets will get a synthesized event from their parent widget.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_EXPOSURE_MASK mask.

widget :

the object which received the signal.

event :

the GdkEventExpose which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "focus" signal

gboolean            user_function                      (GtkWidget       *widget,
                                                        GtkDirectionType arg1,
                                                        gpointer         user_data)      : Run Last

widget :

the object which received the signal.

arg1 :

user_data :

user data set when the signal handler was connected.

Returns :

%TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "focus-in-event" signal

gboolean            user_function                      (GtkWidget     *widget,
                                                        GdkEventFocus *event,
                                                        gpointer       user_data)      : Run Last

The ::focus-in-event signal will be emitted when the keyboard focus enters the widget's window.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_FOCUS_CHANGE_MASK mask.

widget :

the object which received the signal

event :

the GdkEventFocus which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "focus-out-event" signal

gboolean            user_function                      (GtkWidget     *widget,
                                                        GdkEventFocus *event,
                                                        gpointer       user_data)      : Run Last

The ::focus-out-event signal will be emitted when the keyboard focus leaves the widget's window.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_FOCUS_CHANGE_MASK mask.

widget :

the object which received the signal

event :

the GdkEventFocus which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "grab-broken-event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

Emitted when a pointer or keyboard grab on a window belonging to widget gets broken.

On X11, this happens when the grab window becomes unviewable (i.e. it or one of its ancestors is unmapped), or if the same application grabs the pointer or keyboard again.

widget :

the object which received the signal

event :

the GdkEventGrabBroken event

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

Since 2.8


The "grab-focus" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run Last / Action

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "grab-notify" signal

void                user_function                      (GtkWidget *widget,
                                                        gboolean   was_grabbed,
                                                        gpointer   user_data)        : Run First

The ::grab-notify signal is emitted when a widget becomes shadowed by a GTK+ grab (not a pointer or keyboard grab) on another widget, or when it becomes unshadowed due to a grab being removed.

A widget is shadowed by a gtk_grab_add() when the topmost grab widget in the grab stack of its window group is not its ancestor.

widget :

the object which received the signal

was_grabbed :

FALSE if the widget becomes shadowed, TRUE if it becomes unshadowed

user_data :

user data set when the signal handler was connected.

The "hide" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run First

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "hierarchy-changed" signal

void                user_function                      (GtkWidget *widget,
                                                        GtkWidget *previous_toplevel,
                                                        gpointer   user_data)              : Run Last

The ::hierarchy-changed signal is emitted when the anchored state of a widget changes. A widget is anchored when its toplevel ancestor is a GtkWindow. This signal is emitted when a widget changes from un-anchored to anchored or vice-versa.

widget :

the object on which the signal is emitted

previous_toplevel :

the previous toplevel ancestor, or NULL if the widget was previously unanchored

user_data :

user data set when the signal handler was connected.

The "key-press-event" signal

gboolean            user_function                      (GtkWidget   *widget,
                                                        GdkEventKey *event,
                                                        gpointer     user_data)      : Run Last

The ::key-press-event signal is emitted when a key is pressed.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_KEY_PRESS_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal

event :

the GdkEventKey which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "key-release-event" signal

gboolean            user_function                      (GtkWidget   *widget,
                                                        GdkEventKey *event,
                                                        gpointer     user_data)      : Run Last

The ::key-release-event signal is emitted when a key is pressed.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_KEY_RELEASE_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal

event :

the GdkEventKey which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "keynav-failed" signal

gboolean            user_function                      (GtkWidget       *widget,
                                                        GtkDirectionType direction,
                                                        gpointer         user_data)      : Run Last

Gets emitted if keyboard navigation fails. See gtk_widget_keynav_failed() for details.

widget :

the object which received the signal

direction :

the direction of movement

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if stopping keyboard navigation is fine, FALSE if the emitting widget should try to handle the keyboard navigation attempt in its parent container(s).

Since 2.12


The "leave-notify-event" signal

gboolean            user_function                      (GtkWidget        *widget,
                                                        GdkEventCrossing *event,
                                                        gpointer          user_data)      : Run Last

The ::leave-notify-event will be emitted when the pointer leaves the widget's window.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_LEAVE_NOTIFY_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal

event :

the GdkEventCrossing which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "map" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run First

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "map-event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

The ::map-event signal will be emitted when the widget's window is mapped. A window is mapped when it becomes visible on the screen.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

widget :

the object which received the signal

event :

the GdkEventAny which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "mnemonic-activate" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        gboolean   arg1,
                                                        gpointer   user_data)      : Run Last

widget :

the object which received the signal.

arg1 :

user_data :

user data set when the signal handler was connected.

Returns :


The "motion-notify-event" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkEventMotion *event,
                                                        gpointer        user_data)      : Run Last

The ::motion-notify-event signal is emitted when the pointer moves over the widget's GdkWindow.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_POINTER_MOTION_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal.

event :

the GdkEventMotion which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "move-focus" signal

void                user_function                      (GtkWidget       *widget,
                                                        GtkDirectionType arg1,
                                                        gpointer         user_data)      : Run Last / Action

widget :

the object which received the signal.

arg1 :

user_data :

user data set when the signal handler was connected.

The "no-expose-event" signal

gboolean            user_function                      (GtkWidget        *widget,
                                                        GdkEventNoExpose *event,
                                                        gpointer          user_data)      : Run Last

The ::no-expose-event will be emitted when the widget's window is drawn as a copy of another GdkDrawable (with gdk_draw_drawable() or gdk_window_copy_area()) which was completely unobscured. If the source window was partially obscured GdkEventExpose events will be generated for those areas.

widget :

the object which received the signal

event :

the GdkEventNoExpose which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "parent-set" signal

void                user_function                      (GtkWidget *widget,
                                                        GtkObject *old_parent,
                                                        gpointer   user_data)       : Run First

The ::parent-set signal is emitted when a new parent has been set on a widget.

widget :

the object on which the signal is emitted

old_parent :

the previous parent, or NULL if the widget just got its initial parent.

user_data :

user data set when the signal handler was connected.

The "popup-menu" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run Last / Action

This signal gets emitted whenever a widget should pop up a context menu. This usually happens through the standard key binding mechanism; by pressing a certain key while a widget is focused, the user can cause the widget to pop up a menu. For example, the GtkEntry widget creates a menu with clipboard commands. See the section called “Implement GtkWidget::popup_menu” for an example of how to use this signal.

widget :

the object which received the signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if a menu was activated

The "property-notify-event" signal

gboolean            user_function                      (GtkWidget        *widget,
                                                        GdkEventProperty *event,
                                                        gpointer          user_data)      : Run Last

The ::property-notify-event signal will be emitted when a property on the widget's window has been changed or deleted.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_PROPERTY_CHANGE_MASK mask.

widget :

the object which received the signal

event :

the GdkEventProperty which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "proximity-in-event" signal

gboolean            user_function                      (GtkWidget         *widget,
                                                        GdkEventProximity *event,
                                                        gpointer           user_data)      : Run Last

To receive this signal the GdkWindow associated to the widget needs to enable the GDK_PROXIMITY_IN_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal

event :

the GdkEventProximity which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "proximity-out-event" signal

gboolean            user_function                      (GtkWidget         *widget,
                                                        GdkEventProximity *event,
                                                        gpointer           user_data)      : Run Last

To receive this signal the GdkWindow associated to the widget needs to enable the GDK_PROXIMITY_OUT_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal

event :

the GdkEventProximity which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "query-tooltip" signal

gboolean            user_function                      (GtkWidget  *widget,
                                                        gint        x,
                                                        gint        y,
                                                        gboolean    keyboard_mode,
                                                        GtkTooltip *tooltip,
                                                        gpointer    user_data)          : Run Last

Emitted when "has-tooltip" is TRUE and the "gtk-tooltip-timeout" has expired with the cursor hovering "above" widget; or emitted when widget got focus in keyboard mode.

Using the given coordinates, the signal handler should determine whether a tooltip should be shown for widget. If this is the case TRUE should be returned, FALSE otherwise. Note that if keyboard_mode is TRUE, the values of x and y are undefined and should not be used.

The signal handler is free to manipulate tooltip with the therefore destined function calls.

widget :

the object which received the signal

x :

the x coordinate of the cursor position where the request has been emitted, relative to widget->window

y :

the y coordinate of the cursor position where the request has been emitted, relative to widget->window

keyboard_mode :

TRUE if the tooltip was trigged using the keyboard

tooltip :

a GtkTooltip

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if tooltip should be shown right now, FALSE otherwise.

Since 2.12


The "realize" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run First

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "screen-changed" signal

void                user_function                      (GtkWidget *widget,
                                                        GdkScreen *previous_screen,
                                                        gpointer   user_data)            : Run Last

The ::screen-changed signal gets emitted when the screen of a widget has changed.

widget :

the object on which the signal is emitted

previous_screen :

the previous screen, or NULL if the widget was not associated with a screen before

user_data :

user data set when the signal handler was connected.

The "scroll-event" signal

gboolean            user_function                      (GtkWidget      *widget,
                                                        GdkEventScroll *event,
                                                        gpointer        user_data)      : Run Last

The ::scroll-event signal is emitted when a button in the 4 to 7 range is pressed. Wheel mice are usually configured to generate button press events for buttons 4 and 5 when the wheel is turned.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_BUTTON_PRESS_MASK mask.

This signal will be sent to the grab widget if there is one.

widget :

the object which received the signal.

event :

the GdkEventScroll which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "selection-clear-event" signal

gboolean            user_function                      (GtkWidget         *widget,
                                                        GdkEventSelection *event,
                                                        gpointer           user_data)      : Run Last

The ::selection-clear-event signal will be emitted when the the widget's window has lost ownership of a selection.

widget :

the object which received the signal

event :

the GdkEventSelection which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "selection-get" signal

void                user_function                      (GtkWidget        *widget,
                                                        GtkSelectionData *data,
                                                        guint             info,
                                                        guint             time,
                                                        gpointer          user_data)      : Run Last

widget :

the object which received the signal.

data :

info :

time :

user_data :

user data set when the signal handler was connected.

The "selection-notify-event" signal

gboolean            user_function                      (GtkWidget         *widget,
                                                        GdkEventSelection *event,
                                                        gpointer           user_data)      : Run Last

widget :

the object which received the signal.

event :

user_data :

user data set when the signal handler was connected.

Returns :

%TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "selection-received" signal

void                user_function                      (GtkWidget        *widget,
                                                        GtkSelectionData *data,
                                                        guint             time,
                                                        gpointer          user_data)      : Run Last

widget :

the object which received the signal.

data :

time :

user_data :

user data set when the signal handler was connected.

The "selection-request-event" signal

gboolean            user_function                      (GtkWidget         *widget,
                                                        GdkEventSelection *event,
                                                        gpointer           user_data)      : Run Last

The ::selection-request-event signal will be emitted when another client requests ownership of the selection owned by the widget's window.

widget :

the object which received the signal

event :

the GdkEventSelection which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "show" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run First

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "show-help" signal

gboolean            user_function                      (GtkWidget        *widget,
                                                        GtkWidgetHelpType arg1,
                                                        gpointer          user_data)      : Run Last / Action

widget :

the object which received the signal.

arg1 :

user_data :

user data set when the signal handler was connected.

Returns :


The "size-allocate" signal

void                user_function                      (GtkWidget     *widget,
                                                        GtkAllocation *allocation,
                                                        gpointer       user_data)       : Run First

widget :

the object which received the signal.

allocation :

user_data :

user data set when the signal handler was connected.

The "size-request" signal

void                user_function                      (GtkWidget      *widget,
                                                        GtkRequisition *requisition,
                                                        gpointer        user_data)        : Run First

widget :

the object which received the signal.

requisition :

user_data :

user data set when the signal handler was connected.

The "state-changed" signal

void                user_function                      (GtkWidget   *widget,
                                                        GtkStateType state,
                                                        gpointer     user_data)      : Run First

widget :

the object which received the signal.

state :

user_data :

user data set when the signal handler was connected.

The "style-set" signal

void                user_function                      (GtkWidget *widget,
                                                        GtkStyle  *previous_style,
                                                        gpointer   user_data)           : Run First

The ::style-set signal is emitted when a new style has been set on a widget. Note that style-modifying functions like gtk_widget_modify_base() also cause this signal to be emitted.

widget :

the object on which the signal is emitted

previous_style :

the previous style, or NULL if the widget just got its initial style

user_data :

user data set when the signal handler was connected.

The "unmap" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run First

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "unmap-event" signal

gboolean            user_function                      (GtkWidget *widget,
                                                        GdkEvent  *event,
                                                        gpointer   user_data)      : Run Last

The ::unmap-event signal will be emitted when the widget's window is unmapped. A window is unmapped when it becomes invisible on the screen.

To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

widget :

the object which received the signal

event :

the GdkEventAny which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "unrealize" signal

void                user_function                      (GtkWidget *widget,
                                                        gpointer   user_data)      : Run Last

widget :

the object which received the signal.

user_data :

user data set when the signal handler was connected.

The "visibility-notify-event" signal

gboolean            user_function                      (GtkWidget          *widget,
                                                        GdkEventVisibility *event,
                                                        gpointer            user_data)      : Run Last

The ::visibility-notify-event will be emitted when the widget's window is obscured or unobscured.

To receive this signal the GdkWindow associated to the widget needs to enable the GDK_VISIBILITY_NOTIFY_MASK mask.

widget :

the object which received the signal

event :

the GdkEventVisibility which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.

The "window-state-event" signal

gboolean            user_function                      (GtkWidget           *widget,
                                                        GdkEventWindowState *event,
                                                        gpointer             user_data)      : Run Last

The ::window-state-event will be emitted when the state of the toplevel window associated to the widget changes.

To receive this signal the GdkWindow associated to the widget needs to enable the GDK_STRUCTURE_MASK mask. GDK will enable this mask automatically for all new windows.

widget :

the object which received the signal

event :

the GdkEventWindowState which triggered this signal

user_data :

user data set when the signal handler was connected.

Returns :

TRUE to stop other handlers from being invoked for the event. FALSE to propagate the event further.
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