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c++x11gtkmmgtkmm4

gtkmm 4: How to get X window ID from inside widget?

In gtkmm 4, how can one get the X Window ID of type XID as defined in X11/X.h, from inside a class, that inherits from Gtk::Widget?

Solution

  • Not all of them have one.

    Those widgets that do will implement the GtkNative interface, which provides the gtk_native_get_surface function, allowing you to obtain a GdkSurface. In gtkmm, this will correspond to casting to to Gtk::Native and calling get_surface.

    To obtain a Window handle from that, you can use the GDK_SURFACE_XID macro. For that, I don’t think a C++ wrapper exists; you will have to call Gdk::Surface::gobj to obtain a GdkSurface * and use the C API.