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GtkScrolledWindow

GtkScrolledWindow — Adds scrollbars to its child widget

Synopsis


#include <gtk/gtk.h>

                    GtkScrolledWindow;
GtkWidget*          gtk_scrolled_window_new             (GtkAdjustment *hadjustment,
                                                         GtkAdjustment *vadjustment);
GtkAdjustment*      gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window);
GtkAdjustment*      gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window);
GtkWidget*          gtk_scrolled_window_get_hscrollbar  (GtkScrolledWindow *scrolled_window);
GtkWidget*          gtk_scrolled_window_get_vscrollbar  (GtkScrolledWindow *scrolled_window);
void                gtk_scrolled_window_set_policy      (GtkScrolledWindow *scrolled_window,
                                                         GtkPolicyType hscrollbar_policy,
                                                         GtkPolicyType vscrollbar_policy);
void                gtk_scrolled_window_add_with_viewport
                                                        (GtkScrolledWindow *scrolled_window,
                                                         GtkWidget *child);
void                gtk_scrolled_window_set_placement   (GtkScrolledWindow *scrolled_window,
                                                         GtkCornerType window_placement);
void                gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window);
void                gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
                                                         GtkShadowType type);
void                gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
                                                         GtkAdjustment *hadjustment);
void                gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
                                                         GtkAdjustment *vadjustment);
GtkCornerType       gtk_scrolled_window_get_placement   (GtkScrolledWindow *scrolled_window);
void                gtk_scrolled_window_get_policy      (GtkScrolledWindow *scrolled_window,
                                                         GtkPolicyType *hscrollbar_policy,
                                                         GtkPolicyType *vscrollbar_policy);
GtkShadowType       gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window);

Object Hierarchy

  GObject
   +----GInitiallyUnowned
         +----GtkObject
               +----GtkWidget
                     +----GtkContainer
                           +----GtkBin
                                 +----GtkScrolledWindow

Implemented Interfaces

GtkScrolledWindow implements AtkImplementorIface and GtkBuildable.

Properties

  "hadjustment"              GtkAdjustment*        : Read / Write / Construct
  "hscrollbar-policy"        GtkPolicyType         : Read / Write
  "shadow-type"              GtkShadowType         : Read / Write
  "vadjustment"              GtkAdjustment*        : Read / Write / Construct
  "vscrollbar-policy"        GtkPolicyType         : Read / Write
  "window-placement"         GtkCornerType         : Read / Write
  "window-placement-set"     gboolean              : Read / Write

Style Properties

  "scrollbar-spacing"        gint                  : Read
  "scrollbars-within-bevel"  gboolean              : Read

Signals

  "move-focus-out"                                 : Run Last / Action
  "scroll-child"                                   : Run Last / Action

Description

GtkScrolledWindow is a GtkBin subclass: it's a container the accepts a single child widget. GtkScrolledWindow adds scrollbars to the child widget and optionally draws a beveled frame around the child widget.

The scrolled window can work in two ways. Some widgets have native scrolling support; these widgets have "slots" for GtkAdjustment objects. [5] Widgets with native scroll support include GtkTreeView, GtkTextView, and GtkLayout.

For widgets that lack native scrolling support, the GtkViewport widget acts as an adaptor class, implementing scrollability for child widgets that lack their own scrolling capabilities. Use GtkViewport to scroll child widgets such as GtkTable, GtkBox, and so on.

If a widget has native scrolling abilities, it can be added to the GtkScrolledWindow with gtk_container_add(). If a widget does not, you must first add the widget to a GtkViewport, then add the GtkViewport to the scrolled window. The convenience function gtk_scrolled_window_add_with_viewport() does exactly this, so you can ignore the presence of the viewport.

The position of the scrollbars is controlled by the scroll adjustments. See GtkAdjustment for the fields in an adjustment - for GtkScrollbar, used by GtkScrolledWindow, the "value" field represents the position of the scrollbar, which must be between the "lower" field and "upper - page_size." The "page_size" field represents the size of the visible scrollable area. The "step_increment" and "page_increment" fields are used when the user asks to step down (using the small stepper arrows) or page down (using for example the PageDown key).

If a GtkScrolledWindow doesn't behave quite as you would like, or doesn't have exactly the right layout, it's very possible to set up your own scrolling with GtkScrollbar and for example a GtkTable.

Details

GtkScrolledWindow

typedef struct {
  GtkWidget *GSEAL (hscrollbar);
  GtkWidget *GSEAL (vscrollbar);
} GtkScrolledWindow;

There are no public fields in the GtkScrolledWindow struct; it should only be accessed using the functions below.


gtk_scrolled_window_new ()

GtkWidget*          gtk_scrolled_window_new             (GtkAdjustment *hadjustment,
                                                         GtkAdjustment *vadjustment);

Creates a new scrolled window.

The two arguments are the scrolled window's adjustments; these will be shared with the scrollbars and the child widget to keep the bars in sync with the child. Usually you want to pass NULL for the adjustments, which will cause the scrolled window to create them for you.

hadjustment :

horizontal adjustment

vadjustment :

vertical adjustment

Returns :

a new scrolled window

gtk_scrolled_window_get_hadjustment ()

GtkAdjustment*      gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window);

Returns the horizontal scrollbar's adjustment, used to connect the horizontal scrollbar to the child widget's horizontal scroll functionality.

scrolled_window :

a GtkScrolledWindow

Returns :

the horizontal GtkAdjustment

gtk_scrolled_window_get_vadjustment ()

GtkAdjustment*      gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window);

Returns the vertical scrollbar's adjustment, used to connect the vertical scrollbar to the child widget's vertical scroll functionality.

scrolled_window :

a GtkScrolledWindow

Returns :

the vertical GtkAdjustment

gtk_scrolled_window_get_hscrollbar ()

GtkWidget*          gtk_scrolled_window_get_hscrollbar  (GtkScrolledWindow *scrolled_window);

Returns the horizontal scrollbar of scrolled_window.

scrolled_window :

a GtkScrolledWindow

Returns :

the horizontal scrollbar of the scrolled window, or NULL if it does not have one.

Since 2.8


gtk_scrolled_window_get_vscrollbar ()

GtkWidget*          gtk_scrolled_window_get_vscrollbar  (GtkScrolledWindow *scrolled_window);

Returns the vertical scrollbar of scrolled_window.

scrolled_window :

a GtkScrolledWindow

Returns :

the vertical scrollbar of the scrolled window, or NULL if it does not have one.

Since 2.8


gtk_scrolled_window_set_policy ()

void                gtk_scrolled_window_set_policy      (GtkScrolledWindow *scrolled_window,
                                                         GtkPolicyType hscrollbar_policy,
                                                         GtkPolicyType vscrollbar_policy);

Sets the scrollbar policy for the horizontal and vertical scrollbars.

The policy determines when the scrollbar should appear; it is a value from the GtkPolicyType enumeration. If GTK_POLICY_ALWAYS, the scrollbar is always present; if GTK_POLICY_NEVER, the scrollbar is never present; if GTK_POLICY_AUTOMATIC, the scrollbar is present only if needed (that is, if the slider part of the bar would be smaller than the trough - the display is larger than the page size).

scrolled_window :

a GtkScrolledWindow

hscrollbar_policy :

policy for horizontal bar

vscrollbar_policy :

policy for vertical bar

gtk_scrolled_window_add_with_viewport ()

void                gtk_scrolled_window_add_with_viewport
                                                        (GtkScrolledWindow *scrolled_window,
                                                         GtkWidget *child);

Used to add children without native scrolling capabilities. This is simply a convenience function; it is equivalent to adding the unscrollable child to a viewport, then adding the viewport to the scrolled window. If a child has native scrolling, use gtk_container_add() instead of this function.

The viewport scrolls the child by moving its GdkWindow, and takes the size of the child to be the size of its toplevel GdkWindow. This will be very wrong for most widgets that support native scrolling; for example, if you add a widget such as GtkTreeView with a viewport, the whole widget will scroll, including the column headings. Thus, widgets with native scrolling support should not be used with the GtkViewport proxy.

A widget supports scrolling natively if the set_scroll_adjustments_signal field in GtkWidgetClass is non-zero, i.e. has been filled in with a valid signal identifier.

scrolled_window :

a GtkScrolledWindow

child :

the widget you want to scroll

gtk_scrolled_window_set_placement ()

void                gtk_scrolled_window_set_placement   (GtkScrolledWindow *scrolled_window,
                                                         GtkCornerType window_placement);

Sets the placement of the contents with respect to the scrollbars for the scrolled window.

The default is GTK_CORNER_TOP_LEFT, meaning the child is in the top left, with the scrollbars underneath and to the right. Other values in GtkCornerType are GTK_CORNER_TOP_RIGHT, GTK_CORNER_BOTTOM_LEFT, and GTK_CORNER_BOTTOM_RIGHT.

See also gtk_scrolled_window_get_placement() and gtk_scrolled_window_unset_placement().

scrolled_window :

a GtkScrolledWindow

window_placement :

position of the child window

gtk_scrolled_window_unset_placement ()

void                gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window);

Unsets the placement of the contents with respect to the scrollbars for the scrolled window. If no window placement is set for a scrolled window, it obeys the "gtk-scrolled-window-placement" XSETTING.

See also gtk_scrolled_window_set_placement() and gtk_scrolled_window_get_placement().

scrolled_window :

a GtkScrolledWindow

Since 2.10


gtk_scrolled_window_set_shadow_type ()

void                gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,
                                                         GtkShadowType type);

Changes the type of shadow drawn around the contents of scrolled_window.

scrolled_window :

a GtkScrolledWindow

type :

kind of shadow to draw around scrolled window contents

gtk_scrolled_window_set_hadjustment ()

void                gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
                                                         GtkAdjustment *hadjustment);

Sets the GtkAdjustment for the horizontal scrollbar.

scrolled_window :

a GtkScrolledWindow

hadjustment :

horizontal scroll adjustment

gtk_scrolled_window_set_vadjustment ()

void                gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
                                                         GtkAdjustment *vadjustment);

Sets the GtkAdjustment for the vertical scrollbar.

scrolled_window :

a GtkScrolledWindow

vadjustment :

vertical scroll adjustment

gtk_scrolled_window_get_placement ()

GtkCornerType       gtk_scrolled_window_get_placement   (GtkScrolledWindow *scrolled_window);

Gets the placement of the contents with respect to the scrollbars for the scrolled window. See gtk_scrolled_window_set_placement().

scrolled_window :

a GtkScrolledWindow

Returns :

the current placement value. See also gtk_scrolled_window_set_placement() and gtk_scrolled_window_unset_placement().

gtk_scrolled_window_get_policy ()

void                gtk_scrolled_window_get_policy      (GtkScrolledWindow *scrolled_window,
                                                         GtkPolicyType *hscrollbar_policy,
                                                         GtkPolicyType *vscrollbar_policy);

Retrieves the current policy values for the horizontal and vertical scrollbars. See gtk_scrolled_window_set_policy().

scrolled_window :

a GtkScrolledWindow

hscrollbar_policy :

location to store the policy for the horizontal scrollbar, or NULL.

vscrollbar_policy :

location to store the policy for the vertical scrollbar, or NULL.

gtk_scrolled_window_get_shadow_type ()

GtkShadowType       gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window);

Gets the shadow type of the scrolled window. See gtk_scrolled_window_set_shadow_type().

scrolled_window :

a GtkScrolledWindow

Returns :

the current shadow type

Property Details

The "hadjustment" property

  "hadjustment"              GtkAdjustment*        : Read / Write / Construct

The GtkAdjustment for the horizontal position.


The "hscrollbar-policy" property

  "hscrollbar-policy"        GtkPolicyType         : Read / Write

When the horizontal scrollbar is displayed.

Default value: GTK_POLICY_ALWAYS


The "shadow-type" property

  "shadow-type"              GtkShadowType         : Read / Write

Style of bevel around the contents.

Default value: GTK_SHADOW_NONE


The "vadjustment" property

  "vadjustment"              GtkAdjustment*        : Read / Write / Construct

The GtkAdjustment for the vertical position.


The "vscrollbar-policy" property

  "vscrollbar-policy"        GtkPolicyType         : Read / Write

When the vertical scrollbar is displayed.

Default value: GTK_POLICY_ALWAYS


The "window-placement" property

  "window-placement"         GtkCornerType         : Read / Write

Where the contents are located with respect to the scrollbars. This property only takes effect if "window-placement-set" is TRUE.

Default value: GTK_CORNER_TOP_LEFT


The "window-placement-set" property

  "window-placement-set"     gboolean              : Read / Write

Whether "window-placement" should be used to determine the location of the contents with respect to the scrollbars. Otherwise, the "gtk-scrolled-window-placement" setting is used.

Default value: FALSE

Since 2.10

Style Property Details

The "scrollbar-spacing" style property

  "scrollbar-spacing"        gint                  : Read

Number of pixels between the scrollbars and the scrolled window.

Allowed values: >= 0

Default value: 3


The "scrollbars-within-bevel" style property

  "scrollbars-within-bevel"  gboolean              : Read

Whether to place scrollbars within the scrolled window's bevel.

Default value: FALSE

Since 2.12

Signal Details

The "move-focus-out" signal

void                user_function                      (GtkScrolledWindow *scrolledwindow,
                                                        GtkDirectionType   arg1,
                                                        gpointer           user_data)           : Run Last / Action

scrolledwindow :

arg1 :

user_data :

user data set when the signal handler was connected.

The "scroll-child" signal

gboolean            user_function                      (GtkScrolledWindow *scrolledwindow,
                                                        GtkScrollType      arg1,
                                                        gboolean           arg2,
                                                        gpointer           user_data)           : Run Last / Action

scrolledwindow :

arg1 :

arg2 :

user_data :

user data set when the signal handler was connected.

Returns :



[5] The scrolled window installs GtkAdjustment objects in the child window's slots using the set_scroll_adjustments_signal, found in GtkWidgetClass. (Conceptually, these widgets implement a "Scrollable" interface; because GTK+ 1.2 lacked interface support in the object system, this interface is hackily implemented as a signal in GtkWidgetClass. The GTK+ 2.0 object system would allow a clean implementation, but it wasn't worth breaking the API.)