Thank you for this tutorial. Until today I haven't found one for gtk4, so this is a blessing.

Currently I'm struggling with a simple question: how to detect a mouse button click in an Entry?

(I want to open a popup when left-click inside an Entry).

In GTK3, I did (in my entry class):

        self.add_events(Gdk.EventMask.BUTTON_PRESS_MASK)
        self.connect("button-press-event", self.onClick)

but GTK4 doesn't have "button-press-event", right?

After some search, I managed to do something like this:

        self.leftClick = Gtk.GestureClick()
        self.leftClick.set_button(1)
        self.leftClick.connect("pressed", self.onClick)
        self.add_controller(self.leftClick)

but the callback works only when I click on the entry's border, but not in the text field.

It would be nice to know how it works.