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GdkDisplayManager

GdkDisplayManager — Maintains a list of all open GdkDisplays

Properties

GdkDisplay * default-display Read / Write

Signals

Types and Values

Object Hierarchy

    GObject
    ╰── GdkDisplayManager

Includes

#include <gdk/gdk.h>

Description

The purpose of the GdkDisplayManager singleton object is to offer notification when displays appear or disappear or the default display changes.

You can use gdk_display_manager_get() to obtain the GdkDisplayManager singleton, but that should be rarely necessary. Typically, initializing GTK+ opens a display that you can work with without ever accessing the GdkDisplayManager.

The GDK library can be built with support for multiple backends. The GdkDisplayManager object determines which backend is used at runtime.

When writing backend-specific code that is supposed to work with multiple GDK backends, you have to consider both compile time and runtime. At compile time, use the GDK_WINDOWING_X11, GDK_WINDOWING_WIN32 macros, etc. to find out which backends are present in the GDK library you are building your application against. At runtime, use type-check macros like GDK_IS_X11_DISPLAY() to find out which backend is in use:

Backend-specific code

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#ifdef GDK_WINDOWING_X11
  if (GDK_IS_X11_DISPLAY (display))
    {
      // make X11-specific calls here
    }
  else
#endif
#ifdef GDK_WINDOWING_QUARTZ
  if (GDK_IS_QUARTZ_DISPLAY (display))
    {
      // make Quartz-specific calls here
    }
  else
#endif
  g_error ("Unsupported GDK backend");

Functions

gdk_display_manager_get ()

GdkDisplayManager *
gdk_display_manager_get (void);

Gets the singleton GdkDisplayManager object.

When called for the first time, this function consults the GDK_BACKEND environment variable to find out which of the supported GDK backends to use (in case GDK has been compiled with multiple backends). Applications can use gdk_set_allowed_backends() to limit what backends can be used.

Returns

The global GdkDisplayManager singleton; gdk_parse_args(), gdk_init(), or gdk_init_check() must have been called first.

[transfer none]

Since: 2.2


gdk_display_manager_get_default_display ()

GdkDisplay *
gdk_display_manager_get_default_display
                               (GdkDisplayManager *manager);

Gets the default GdkDisplay.

Parameters

manager

a GdkDisplayManager

 

Returns

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

[nullable][transfer none]

Since: 2.2


gdk_display_manager_set_default_display ()

void
gdk_display_manager_set_default_display
                               (GdkDisplayManager *manager,
                                GdkDisplay *display);

Sets display as the default display.

Parameters

manager

a GdkDisplayManager

 

display

a GdkDisplay

 

Since: 2.2


gdk_display_manager_list_displays ()

GSList *
gdk_display_manager_list_displays (GdkDisplayManager *manager);

List all currently open displays.

Parameters

manager

a GdkDisplayManager

 

Returns

a newly allocated GSList of GdkDisplay objects. Free with g_slist_free() when you are done with it.

[transfer container][element-type GdkDisplay]

Since: 2.2


gdk_display_manager_open_display ()

GdkDisplay *
gdk_display_manager_open_display (GdkDisplayManager *manager,
                                  const gchar *name);

Opens a display.

Parameters

manager

a GdkDisplayManager

 

name

the name of the display to open

 

Returns

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

[nullable][transfer none]

Since: 3.0

Types and Values

GdkDisplayManager

typedef struct _GdkDisplayManager GdkDisplayManager;

Property Details

The “default-display” property

  “default-display”          GdkDisplay *

The default display for GDK.

Flags: Read / Write

Signal Details

The “display-opened” signal

void
user_function (GdkDisplayManager *manager,
               GdkDisplay        *display,
               gpointer           user_data)

The ::display-opened signal is emitted when a display is opened.

Parameters

manager

the object on which the signal is emitted

 

display

the opened display

 

user_data

user data set when the signal handler was connected.

 

Flags: Run Last

Since: 2.2

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