Enabling window dragging on specific elements in GTK 4

Platform
1

How I can specify that certain parts of the application should be allowed to start a window dragging operation (when such an operation is supported by the windowing manager)? The -GtkWidget-window-dragging CSS attribute seems to no longer be supported in GTK4 and I don’t know how to proceed without it.

2

You can put your widgets inside a GtkWindowHandle widget. That should do it if I understand your question correctly.

https://developer.gnome.org/gtk4/stable/GtkWindowHandle.html

1 Like
3

Thank you, I wasn’t aware of that widget and it will help in some cases. Could you perhaps explain how I could use that to make a message dialog draggable? I don’t know how to put the dialog inside a widget, as the dialog window is at the root of its own hierarchy. (The message dialog doesn’t have a header bar of its own.)

4

You might use gdk_window_begin_move_drag (GTK3) or gdk_toplevel_begin_move (GTK4).

5

Thanks, gdk_toplevel_begin_move looks useful here, I’ll give it a try.

6

You don’t, but that may make sense to do upstream instead? Having message dialogs be only draggable by a tiny header was never great.

7

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