48 lines
1.4 KiB
Markdown
48 lines
1.4 KiB
Markdown
Title: X Window System Interaction
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## X backend-specific functions
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The functions in this section are specific to the GDK X11 backend.
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To use them, you need to include the `<gdk/x11/gdkx.h>` header and use
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the X11-specific pkg-config file `gtk4-x11` to build your application.
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## Checking for the X11 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_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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#include <gdk/wayland/gdkwayland.h>
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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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#ifdef GDK_WINDOWING_WAYLAND
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if (GDK_IS_WAYLAND_DISPLAY (display))
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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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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 X11, the symbol is `GDK_WINDOWING_X11`.
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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 X11, the display objects will be of type
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`GdkX11Display`.
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