3.6.8. GTK+ Graphics Framework

GTK+, or the GIMP Toolkit, is a multi-platform toolkit for creating graphical user interfaces. Offering a complete set of widgets, GTK+ is suitable for projects ranging from small one-off tools to complete application suites.

Please refer to https://www.gtk.org/ for additional details on GTK+.

The PSDK target file system includes the pre-built GTK+ libraries under /usr/lib for GTK+3 over Wayland support. There is also a comprehensive GTK+3 demo application (gtk3-demo) under /usr/bin to demonstrate GTK+3 APIs and their usages.

3.6.8.1. Demos

GTK+ will attempt to interact with a windowing system on startup. If one is not running, or it fails to connect to one for any reason, you will see the following error:

(<application-name>:<pid>): Gtk-WARNING **: 21:21:27.361: cannot open display: <display>

If no display value is returned, then you are more than likely missing the WAYLAND_DISPLAY environment variable. Check the Weston section for more information.