public class DisplayManager : Object
The purpose of the DisplayManager singleton object is to offer notification when displays appear or disappear or the default display changes.
You can use @get to obtain the DisplayManager singleton, but that should be rarely necessary. Typically, initializing GTK opens a display that you can work with without ever accessing the DisplayManager.
The GDK library can be built with support for multiple backends. The DisplayManager 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_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:
if (GDK_IS_X11_DISPLAY (display))
// make X11-specific calls here
if (GDK_IS_MACOS_DISPLAY (display))
// make Quartz-specific calls here
g_error ("Unsupported GDK backend");