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GdkDisplay

GdkDisplay — Controls the keyboard/mouse pointer grabs and a set of GdkScreens

Functions

GdkDisplay * gdk_display_open ()
GdkDisplay * gdk_display_get_default ()
const gchar * gdk_display_get_name ()
gint gdk_display_get_n_screens ()
GdkScreen * gdk_display_get_screen ()
GdkScreen * gdk_display_get_default_screen ()
void gdk_display_pointer_ungrab ()
void gdk_display_keyboard_ungrab ()
gboolean gdk_display_pointer_is_grabbed ()
void gdk_display_beep ()
void gdk_display_sync ()
void gdk_display_flush ()
void gdk_display_close ()
gboolean gdk_display_is_closed ()
GList * gdk_display_list_devices ()
GdkEvent * gdk_display_get_event ()
GdkEvent * gdk_display_peek_event ()
void gdk_display_put_event ()
void gdk_display_add_client_message_filter ()
void gdk_display_set_double_click_time ()
void gdk_display_set_double_click_distance ()
void gdk_display_get_pointer ()
GdkWindow * gdk_display_get_window_at_pointer ()
GdkDisplayPointerHooks * gdk_display_set_pointer_hooks ()
void gdk_display_warp_pointer ()
gboolean gdk_display_supports_cursor_color ()
gboolean gdk_display_supports_cursor_alpha ()
guint gdk_display_get_default_cursor_size ()
void gdk_display_get_maximal_cursor_size ()
GdkWindow * gdk_display_get_default_group ()
gboolean gdk_display_supports_selection_notification ()
gboolean gdk_display_request_selection_notification ()
gboolean gdk_display_supports_clipboard_persistence ()
void gdk_display_store_clipboard ()
gboolean gdk_display_supports_shapes ()
gboolean gdk_display_supports_input_shapes ()
gboolean gdk_display_supports_composite ()

Signals

Types and Values

Object Hierarchy

    GObject
    ╰── GdkDisplay

Includes

#include <gdk/gdk.h>

Description

GdkDisplay objects purpose are two fold:

  • To grab/ungrab keyboard focus and mouse pointer

  • To manage and provide information about the GdkScreen(s) available for this GdkDisplay

GdkDisplay objects are the GDK representation of the X Display which can be described as a workstation consisting of a keyboard a pointing device (such as a mouse) and one or more screens. It is used to open and keep track of various GdkScreen objects currently instanciated by the application. It is also used to grab and release the keyboard and the mouse pointer.

Functions

gdk_display_open ()

GdkDisplay *
gdk_display_open (const gchar *display_name);

Opens a display.

Parameters

display_name

the name of the display to open

 

Returns

a GdkDisplay, or NULL if the display could not be opened.

Since: 2.2


gdk_display_get_default ()

GdkDisplay *
gdk_display_get_default (void);

Gets the default GdkDisplay. This is a convenience function for gdk_display_manager_get_default_display (gdk_display_manager_get()).

Returns

a GdkDisplay, or NULL if there is no default display.

[transfer none]

Since: 2.2


gdk_display_get_name ()

const gchar *
gdk_display_get_name (GdkDisplay *display);

Gets the name of the display.

Parameters

display

a GdkDisplay

 

Returns

a string representing the display name. This string is owned by GDK and should not be modified or freed.

Since: 2.2


gdk_display_get_n_screens ()

gint
gdk_display_get_n_screens (GdkDisplay *display);

Gets the number of screen managed by the display .

Parameters

display

a GdkDisplay

 

Returns

number of screens.

Since: 2.2


gdk_display_get_screen ()

GdkScreen *
gdk_display_get_screen (GdkDisplay *display,
                        gint screen_num);

Returns a screen object for one of the screens of the display.

Parameters

display

a GdkDisplay

 

screen_num

the screen number

 

Returns

the GdkScreen object

Since: 2.2


gdk_display_get_default_screen ()

GdkScreen *
gdk_display_get_default_screen (GdkDisplay *display);

Get the default GdkScreen for display .

Parameters

display

a GdkDisplay

 

Returns

the default GdkScreen object for display

Since: 2.2


gdk_display_pointer_ungrab ()

void
gdk_display_pointer_ungrab (GdkDisplay *display,
                            guint32 time_);

Release any pointer grab.

Parameters

display

a GdkDisplay.

 

time_

a timestap (e.g. GDK_CURRENT_TIME).

 

Since: 2.2


gdk_display_keyboard_ungrab ()

void
gdk_display_keyboard_ungrab (GdkDisplay *display,
                             guint32 time_);

Release any keyboard grab

Parameters

display

a GdkDisplay.

 

time_

a timestap (e.g GDK_CURRENT_TIME).

 

Since: 2.2


gdk_display_pointer_is_grabbed ()

gboolean
gdk_display_pointer_is_grabbed (GdkDisplay *display);

Test if the pointer is grabbed.

Parameters

display

a GdkDisplay

 

Returns

TRUE if an active X pointer grab is in effect

Since: 2.2


gdk_display_beep ()

void
gdk_display_beep (GdkDisplay *display);

Emits a short beep on display

Parameters

display

a GdkDisplay

 

Since: 2.2


gdk_display_sync ()

void
gdk_display_sync (GdkDisplay *display);

Flushes any requests queued for the windowing system and waits until all requests have been handled. This is often used for making sure that the display is synchronized with the current state of the program. Calling gdk_display_sync() before gdk_error_trap_pop() makes sure that any errors generated from earlier requests are handled before the error trap is removed.

This is most useful for X11. On windowing systems where requests are handled synchronously, this function will do nothing.

Parameters

display

a GdkDisplay

 

Since: 2.2


gdk_display_flush ()

void
gdk_display_flush (GdkDisplay *display);

Flushes any requests queued for the windowing system; this happens automatically when the main loop blocks waiting for new events, but if your application is drawing without returning control to the main loop, you may need to call this function explicitely. A common case where this function needs to be called is when an application is executing drawing commands from a thread other than the thread where the main loop is running.

This is most useful for X11. On windowing systems where requests are handled synchronously, this function will do nothing.

Parameters

display

a GdkDisplay

 

Since: 2.4


gdk_display_close ()

void
gdk_display_close (GdkDisplay *display);

Closes the connection to the windowing system for the given display, and cleans up associated resources.

Parameters

display

a GdkDisplay

 

Since: 2.2


gdk_display_is_closed ()

gboolean
gdk_display_is_closed (GdkDisplay *display);

Finds out if the display has been closed.

Parameters

display

a GdkDisplay

 

Returns

TRUE if the display is closed.

Since: 2.22


gdk_display_list_devices ()

GList *
gdk_display_list_devices (GdkDisplay *display);

Returns the list of available input devices attached to display . The list is statically allocated and should not be freed.

Parameters

display

a GdkDisplay

 

Returns

a list of GdkDevice

Since: 2.2


gdk_display_get_event ()

GdkEvent *
gdk_display_get_event (GdkDisplay *display);

Gets the next GdkEvent to be processed for display , fetching events from the windowing system if necessary.

Parameters

display

a GdkDisplay

 

Returns

the next GdkEvent to be processed, or NULL if no events are pending. The returned GdkEvent should be freed with gdk_event_free().

Since: 2.2


gdk_display_peek_event ()

GdkEvent *
gdk_display_peek_event (GdkDisplay *display);

Gets a copy of the first GdkEvent in the display 's event queue, without removing the event from the queue. (Note that this function will not get more events from the windowing system. It only checks the events that have already been moved to the GDK event queue.)

Parameters

display

a GdkDisplay

 

Returns

a copy of the first GdkEvent on the event queue, or NULL if no events are in the queue. The returned GdkEvent should be freed with gdk_event_free().

Since: 2.2


gdk_display_put_event ()

void
gdk_display_put_event (GdkDisplay *display,
                       const GdkEvent *event);

Appends a copy of the given event onto the front of the event queue for display .

Parameters

display

a GdkDisplay

 

event

a GdkEvent.

 

Since: 2.2


gdk_display_add_client_message_filter ()

void
gdk_display_add_client_message_filter (GdkDisplay *display,
                                       GdkAtom message_type,
                                       GdkFilterFunc func,
                                       gpointer data);

Adds a filter to be called when X ClientMessage events are received. See gdk_window_add_filter() if you are interested in filtering other types of events.

Parameters

display

a GdkDisplay for which this message filter applies

 

message_type

the type of ClientMessage events to receive. This will be checked against the message_type field of the XClientMessage event struct.

 

func

the function to call to process the event.

 

data

user data to pass to func .

 

Since: 2.2


gdk_display_set_double_click_time ()

void
gdk_display_set_double_click_time (GdkDisplay *display,
                                   guint msec);

Sets the double click time (two clicks within this time interval count as a double click and result in a GDK_2BUTTON_PRESS event). Applications should not set this, it is a global user-configured setting.

Parameters

display

a GdkDisplay

 

msec

double click time in milliseconds (thousandths of a second)

 

Since: 2.2


gdk_display_set_double_click_distance ()

void
gdk_display_set_double_click_distance (GdkDisplay *display,
                                       guint distance);

Sets the double click distance (two clicks within this distance count as a double click and result in a GDK_2BUTTON_PRESS event). See also gdk_display_set_double_click_time(). Applications should not set this, it is a global user-configured setting.

Parameters

display

a GdkDisplay

 

distance

distance in pixels

 

Since: 2.4


gdk_display_get_pointer ()

void
gdk_display_get_pointer (GdkDisplay *display,
                         GdkScreen **screen,
                         gint *x,
                         gint *y,
                         GdkModifierType *mask);

Gets the current location of the pointer and the current modifier mask for a given display.

Parameters

display

a GdkDisplay

 

screen

location to store the screen that the cursor is on, or NULL.

[out][allow-none]

x

location to store root window X coordinate of pointer, or NULL.

[out][allow-none]

y

location to store root window Y coordinate of pointer, or NULL.

[out][allow-none]

mask

location to store current modifier mask, or NULL.

[out][allow-none]

Since: 2.2


gdk_display_get_window_at_pointer ()

GdkWindow *
gdk_display_get_window_at_pointer (GdkDisplay *display,
                                   gint *win_x,
                                   gint *win_y);

Obtains the window underneath the mouse pointer, returning the location of the pointer in that window in win_x , win_y for screen . Returns NULL if the window under the mouse pointer is not known to GDK (for example, belongs to another application).

Parameters

display

a GdkDisplay

 

win_x

return location for x coordinate of the pointer location relative to the window origin, or NULL.

[out][allow-none]

win_y

return location for y coordinate of the pointer location relative & to the window origin, or NULL.

[out][allow-none]

Returns

the window under the mouse pointer, or NULL.

[transfer none]

Since: 2.2


gdk_display_set_pointer_hooks ()

GdkDisplayPointerHooks *
gdk_display_set_pointer_hooks (GdkDisplay *display,
                               const GdkDisplayPointerHooks *new_hooks);

gdk_display_set_pointer_hooks has been deprecated since version 2.24 and should not be used in newly-written code.

This function will go away in GTK 3 for lack of use cases.

This function allows for hooking into the operation of getting the current location of the pointer on a particular display. This is only useful for such low-level tools as an event recorder. Applications should never have any reason to use this facility.

Parameters

display

a GdkDisplay

 

new_hooks

a table of pointers to functions for getting quantities related to the current pointer position, or NULL to restore the default table.

 

Returns

the previous pointer hook table

Since: 2.2


gdk_display_warp_pointer ()

void
gdk_display_warp_pointer (GdkDisplay *display,
                          GdkScreen *screen,
                          gint x,
                          gint y);

Warps the pointer of display to the point x ,y on the screen screen , unless the pointer is confined to a window by a grab, in which case it will be moved as far as allowed by the grab. Warping the pointer creates events as if the user had moved the mouse instantaneously to the destination.

Note that the pointer should normally be under the control of the user. This function was added to cover some rare use cases like keyboard navigation support for the color picker in the GtkColorSelectionDialog.

Parameters

display

a GdkDisplay

 

screen

the screen of display to warp the pointer to

 

x

the x coordinate of the destination

 

y

the y coordinate of the destination

 

Since: 2.8


gdk_display_supports_cursor_color ()

gboolean
gdk_display_supports_cursor_color (GdkDisplay *display);

Returns TRUE if multicolored cursors are supported on display . Otherwise, cursors have only a forground and a background color.

Parameters

display

a GdkDisplay

 

Returns

whether cursors can have multiple colors.

Since: 2.4


gdk_display_supports_cursor_alpha ()

gboolean
gdk_display_supports_cursor_alpha (GdkDisplay *display);

Returns TRUE if cursors can use an 8bit alpha channel on display . Otherwise, cursors are restricted to bilevel alpha (i.e. a mask).

Parameters

display

a GdkDisplay

 

Returns

whether cursors can have alpha channels.

Since: 2.4


gdk_display_get_default_cursor_size ()

guint
gdk_display_get_default_cursor_size (GdkDisplay *display);

Returns the default size to use for cursors on display .

Parameters

display

a GdkDisplay

 

Returns

the default cursor size.

Since: 2.4


gdk_display_get_maximal_cursor_size ()

void
gdk_display_get_maximal_cursor_size (GdkDisplay *display,
                                     guint *width,
                                     guint *height);

Gets the maximal size to use for cursors on display .

Parameters

display

a GdkDisplay

 

width

the return location for the maximal cursor width.

[out]

height

the return location for the maximal cursor height.

[out]

Since: 2.4


gdk_display_get_default_group ()

GdkWindow *
gdk_display_get_default_group (GdkDisplay *display);

Returns the default group leader window for all toplevel windows on display . This window is implicitly created by GDK. See gdk_window_set_group().

Parameters

display

a GdkDisplay

 

Returns

The default group leader window for display

Since: 2.4


gdk_display_supports_selection_notification ()

gboolean
gdk_display_supports_selection_notification
                               (GdkDisplay *display);

Returns whether GdkEventOwnerChange events will be sent when the owner of a selection changes.

Parameters

display

a GdkDisplay

 

Returns

whether GdkEventOwnerChange events will be sent.

Since: 2.6


gdk_display_request_selection_notification ()

gboolean
gdk_display_request_selection_notification
                               (GdkDisplay *display,
                                GdkAtom selection);

Request GdkEventOwnerChange events for ownership changes of the selection named by the given atom.

Parameters

display

a GdkDisplay

 

selection

the GdkAtom naming the selection for which ownership change notification is requested

 

Returns

whether GdkEventOwnerChange events will be sent.

Since: 2.6


gdk_display_supports_clipboard_persistence ()

gboolean
gdk_display_supports_clipboard_persistence
                               (GdkDisplay *display);

Returns whether the speicifed display supports clipboard persistance; i.e. if it's possible to store the clipboard data after an application has quit. On X11 this checks if a clipboard daemon is running.

Parameters

display

a GdkDisplay

 

Returns

TRUE if the display supports clipboard persistance.

Since: 2.6


gdk_display_store_clipboard ()

void
gdk_display_store_clipboard (GdkDisplay *display,
                             GdkWindow *clipboard_window,
                             guint32 time_,
                             const GdkAtom *targets,
                             gint n_targets);

Issues a request to the clipboard manager to store the clipboard data. On X11, this is a special program that works according to the freedesktop clipboard specification, available at

http://www.freedesktop.org/Standards/clipboard-manager-spec.

Parameters

display

a GdkDisplay

 

clipboard_window

a GdkWindow belonging to the clipboard owner

 

time_

a timestamp

 

targets

an array of targets that should be saved, or NULL if all available targets should be saved.

 

n_targets

length of the targets array

 

Since: 2.6


gdk_display_supports_shapes ()

gboolean
gdk_display_supports_shapes (GdkDisplay *display);

Returns TRUE if gdk_window_shape_combine_mask() can be used to create shaped windows on display .

Parameters

display

a GdkDisplay

 

Returns

TRUE if shaped windows are supported

Since: 2.10


gdk_display_supports_input_shapes ()

gboolean
gdk_display_supports_input_shapes (GdkDisplay *display);

Returns TRUE if gdk_window_input_shape_combine_mask() can be used to modify the input shape of windows on display .

Parameters

display

a GdkDisplay

 

Returns

TRUE if windows with modified input shape are supported

Since: 2.10


gdk_display_supports_composite ()

gboolean
gdk_display_supports_composite (GdkDisplay *display);

Returns TRUE if gdk_window_set_composited() can be used to redirect drawing on the window using compositing.

Currently this only works on X11 with XComposite and XDamage extensions available.

Parameters

display

a GdkDisplay

 

Returns

TRUE if windows may be composited.

Since: 2.12

Types and Values

GdkDisplay

typedef struct _GdkDisplay GdkDisplay;

The GdkDisplay struct is the GDK representation of an X display. All its fields are private and should not be accessed directly.

Since: 2.2


struct GdkDisplayPointerHooks

struct GdkDisplayPointerHooks {
  void (*get_pointer)              (GdkDisplay      *display,
				    GdkScreen      **screen,
				    gint            *x,
				    gint            *y,
				    GdkModifierType *mask);
  GdkWindow* (*window_get_pointer) (GdkDisplay      *display,
				    GdkWindow       *window,
				    gint            *x,
				    gint            *y,
				    GdkModifierType *mask);
  GdkWindow* (*window_at_pointer)  (GdkDisplay      *display,
				    gint            *win_x,
				    gint            *win_y);
};

A table of pointers to functions for getting quantities related to the current pointer position. Each GdkDisplay has a table of this type, which can be set using gdk_display_set_pointer_hooks().

This is only useful for such low-level tools as an event recorder. Applications should never have any reason to use this facility

Members

get_pointer ()

Obtains the current pointer position and modifier state. The position is given in coordinates relative to the window containing the pointer, which is returned in window .

 

window_get_pointer ()

Obtains the window underneath the mouse pointer. Current pointer position and modifier state are returned in x , y and mask . The position is given in coordinates relative to window .

 

window_at_pointer ()

Obtains the window underneath the mouse pointer, returning the location of that window in win_x , win_y . Returns NULL if the window under the mouse pointer is not known to GDK (for example, belongs to another application).

 

Since: 2.2

Signal Details

The “closed” signal

void
user_function (GdkDisplay *display,
               gboolean    is_error,
               gpointer    user_data)

The ::closed signal is emitted when the connection to the windowing system for display is closed.

Parameters

display

the object on which the signal is emitted

 

is_error

TRUE if the display was closed due to an error

 

user_data

user data set when the signal handler was connected.

 

Flags: Run Last

Since: 2.2

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