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gtkgtk4

Size GtkPopover to the composite widget

I want to set a GtkPopover widget to fit the size of the composite widget.

I have been reading around and know that in gtk3 you could listen to the size-allocate signal, but that no longer exists in gtk4. I read in a Q&A thread that it's best to use properties, but GtkWidget and GtkPopover only have width-request. I tried binding the property and nothing changes.

What would be the right way to size the GtkPopover?

Widget structure

GtkWidget (BoxLayout)
|-GtkEntry
|-GtkButton
|-GtkPopover

Update: Thanks to WhiteOwl comment, size-allocate has been removed and told to use resize signal on GtkDrawingArea and GtkGLArea. But since it's a pure composite widget this change is more of a hindrance.

https://docs.gtk.org/gtk4/migrating-3to4.html#adapt-to-gtkwidgets-size-allocation-changes

Have tried getting the size in realize and map on GtkWidget but width returns 0 for get_size with Horizontal.

Solution

  • I ended up reporting an issue on GTK's gitlab. Turns out I was looking in all the wrong places.

    A maintainer replied with

    If you are talking about a generic widget and its snapshot() vfunc, the size of the widget (in application units) is available at snapshot time via gtk_widget_get_width() and gtk_widget_get_height(). To go from application units to device pixels requires to factor in transforms and scale. See https://docs.gtk.org/gtk4/coordinates.html#scaling