Initialize a new Display.

Gets the default Gdk::Display.

This is a convenience function for:

gdk_display_manager_get_default_display (gdk_display_manager_get ())

Returns the type id (GType) registered in GLib type system.

Opens a display.

If opening the display fails, NULL is returned.

Returns a Gdk::AppLaunchContext suitable for launching applications on the given display.

Emits a short beep on @display

Gets the clipboard used for copy/paste operations.

Closes the connection to the windowing system for the given display.

This cleans up associated resources.

Creates a new Gdk::GLContext for the Gdk::Display.

The context is disconnected from any particular surface or surface and cannot be used to draw to any surface. It can only be used to draw to non-surface framebuffers like textures.

If the creation of the Gdk::GLContext failed, @error will be set. Before using the returned Gdk::GLContext, you will need to call Gdk::GLContext#make_current or Gdk::GLContext#realize.

Returns the default Gdk::Seat for this display.

Note that a display may not have a seat. In this case, this function will return nil.

Returns true if there is an ongoing grab on @device for @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 explicitly. 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.

Finds out if the display has been closed.

Returns whether surfaces can reasonably be expected to have their alpha channel drawn correctly on the screen.

Check Gdk::Display#is_rgba? for whether the display supports an alpha channel.

On X11 this function returns whether a compositing manager is compositing on @display.

On modern displays, this value is always true.

Returns whether surfaces on this @display are created with an alpha channel.

Even if a true is returned, it is possible that the surface’s alpha channel won’t be honored when displaying the surface on the screen: in particular, for X an appropriate windowing manager and compositing manager must be running to provide appropriate display. Use Gdk::Display#is_composited? to check if that is the case.

On modern displays, this value is always true.

Returns the list of seats known to @display.

Returns the keyvals bound to @keycode.

The Nth Gdk::KeymapKey in @keys is bound to the Nth keyval in @keyvals.

When a keycode is pressed by the user, the keyval from this list of entries is selected by considering the effective keyboard group and level.

Free the returned arrays with g_free().

Obtains a list of keycode/group/level combinations that will generate @keyval.

Groups and levels are two kinds of keyboard mode; in general, the level determines whether the top or bottom symbol on a key is used, and the group determines whether the left or right symbol is used.

On US keyboards, the shift key changes the keyboard level, and there are no groups. A group switch key might convert a keyboard between Hebrew to English modes, for example.

Gdk::EventKey contains a %group field that indicates the active keyboard group. The level is computed from the modifier mask.

The returned array should be freed with g_free().

Gets the monitor in which the largest area of @surface resides.

Returns a monitor close to @surface if it is outside of all monitors.

Gets the list of monitors associated with this display.

Subsequent calls to this function will always return the same list for the same display.

You can listen to the GListModel::items-changed signal on this list to monitor changes to the monitor of this display.

Gets the name of the display.

Indicates to the GUI environment that the application has finished loading, using a given identifier.

GTK will call this function automatically for Gtk::Window with custom startup-notification identifier unless Gtk::Window#auto_startup_notification= is called to disable that feature.

Checks that OpenGL is available for @self and ensures that it is properly initialized. When this fails, an @error will be set describing the error and this function returns false.

Note that even if this function succeeds, creating a Gdk::GLContext may still fail.

This function is idempotent. Calling it multiple times will just return the same value or error.

You never need to call this function, GDK will call it automatically as needed. But you can use it as a check when setting up code that might make use of OpenGL.

Gets the clipboard used for the primary selection.

On backends where the primary clipboard is not supported natively, GDK emulates this clipboard locally.

Appends the given event onto the front of the event queue for @display.

This function is only useful in very special situations and should not be used by applications.

Retrieves a desktop-wide setting such as double-click time for the @display.

Gets the startup notification ID for a Wayland display, or nil if no ID has been defined.

Returns true if the display supports input shapes.

This means that Gdk::Surface#input_region= can be used to modify the input shape of surfaces on @display.

On modern displays, this value is always true.

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 [method@Gdk::X11.Display.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.

Translates the contents of a Gdk::EventKey into a keyval, effective group, and level.

Modifiers that affected the translation and are thus unavailable for application use are returned in @consumed_modifiers.

The @effective_group is the group that was actually used for the translation; some keys such as Enter are not affected by the active keyboard group. The @level is derived from @state.

@consumed_modifiers gives modifiers that should be masked out from @state when comparing this key press to a keyboard shortcut. For instance, on a US keyboard, the plus symbol is shifted, so when comparing a key press to a <Control>plus accelerator <Shift> should be masked out.

This function should rarely be needed, since Gdk::EventKey already contains the translated keyval. It is exported for the benefit of virtualized test environments.