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image: Also allow drag with middle button

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Closes #138

Part-of: <https://gitlab.gnome.org/Incubator/loupe/-/merge_requests/180>
This commit is contained in:
Sophie Herold 2023-04-17 02:29:22 +02:00 • committed by Marge Bot
parent e5d5841e5d
commit 83b95a58bd
1 changed files with 7 additions and 1 deletions
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8
src/widgets/image.rs
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@ -414,10 +414,16 @@ mod imp {
);
// Drag for moving image around
let drag_gesture = gtk::GestureDrag::new();
let drag_gesture = gtk::GestureDrag::builder().button(0).build();
obj.add_controller(drag_gesture.clone());
drag_gesture.connect_drag_begin(glib::clone!(@weak obj => move |gesture, _, _| {
// Allow only left and middle button
if ![1, 2].contains(&gesture.current_button()) {
gesture.set_state(gtk::EventSequenceState::Denied);
return;
}
if obj.is_hscrollable() || obj.is_vscrollable() {
obj.set_cursor(gdk::Cursor::from_name("grabbing", None).as_ref());
obj.imp().last_drag_value.set(Some((0., 0.)));