Window function set_titlebar generate gtk-CRITICAL error messages when moving window

[Weboholics]

Line 41 in sourcefile mainwindow.rs enables moving window by pressing mousebutton over the headerbar in the window. When running the program in shell and moving the window I get this message:

gtk_container_propagate_draw: assertion '_gtk_widget_get_parent (child) == GTK_WIDGET (container)' failed

https://developer.gnome.org/gtk3/stable/GtkHeaderBar.html
(using headerbar with set_titlebar)
For these reasons, GtkHeaderBar is the natural choice for use as the custom titlebar widget of a GtkWindow (see gtk_window_set_titlebar()), as it gives features typical of titlebars while allowing the addition of child widgets.

https://developer.gnome.org/gtk3/stable/GtkWindow.html#gtk-window-set-titlebar
(set-titlebar api)
In gtk refrences it seems that set-titlebar should accept any type of GtkWidget

I am new to rust, gtk, open source and linux programming so excuse stupid misstakes I have made.

example code below
moving_window_error.zip

[greyltc]

I've run into the same thing today. Can anyone offer any help?

[sdroege]

There are a couple of mistakes in the attached example:

• putting the headerbar into a vbox and then afterwards setting it as titlebar, that's not allowed as each widget must only have a single parent. That gets rid of the critical warnings. If you set it as a titlebar then you can move the window on it, if you add it to the vbox then you need to implement the moving yourself
• disabling decorations for the window, this will also disable the titlebar

I'd recommend looking at the example here https://github.com/gtk-rs/examples/blob/master/src/bin/progress_tracker.rs

@GuillaumeGomez Please close this one :)