2021-02-17 17:41:56 +00:00
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Title: Wayland Interaction
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## Wayland backend-specific functions
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The functions in this section are specific to the GDK Wayland backend.
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To use them, you need to include the `<gdk/wayland/gdkwayland.h>` header and
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use the Wayland-specific pkg-config `gtk4-wayland` file to build your
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application.
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## Checking for the Wayland backend
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GDK can be built with support for multiple backends, which means you will
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need to perform both compile time *and* run time checks if you wish to call
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backend-specific API; for instance, the code sample below will guard the
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calls to different backends, and error out on unsupported windowing systems:
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```c
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#ifdef GDK_WINDOWING_WAYLAND
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#include <gdk/wayland/gdkwayland.h>
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#endif
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#ifdef GDK_WINDOWING_X11
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#include <gdk/x11/gdkx.h>
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#endif
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#ifdef GDK_WINDOWING_WAYLAND
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2021-11-07 07:48:39 +00:00
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if (GDK_IS_WAYLAND_DISPLAY (display))
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2021-02-17 17:41:56 +00:00
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{
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// make Wayland-specific calls here
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}
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else
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#endif
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#ifdef GDK_WINDOWING_X11
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if (GDK_IS_X11_DISPLAY (display))
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{
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// make X11-specific calls here
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}
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else
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#endif
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g_error ("Unsupported GDK backend");
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```
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The compile time check is performed by using the `GDK_WINDOWING_*`
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pre-processor symbols; there is one defined for each windowing system
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backend built into GDK. For Wayland, the symbol is `GDK_WINDOWING_WAYLAND`.
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The run time check is performed by looking at the type of the
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[class@Gdk.Display] object. For Wayland, the display objects will be of type
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`GdkWaylandDisplay`.
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