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image: Deny drag gesture for touchscreens

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ScrolledWindow can handle the panning in images
better than we can.

This fixes an issue where zoomed in images can't
be zoomed or rotated on touchscreens.

Issue #176

Part-of: <https://gitlab.gnome.org/GNOME/loupe/-/merge_requests/264>
This commit is contained in:
Sophie Herold 2023-07-31 18:29:08 +02:00
parent 936f89eda4
commit c4d8145dd3
1 changed files with 4 additions and 2 deletions
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6
src/widgets/image.rs
View file

@ -421,14 +421,16 @@ mod imp {
drag_gesture.connect_drag_begin(glib::clone!(@weak obj => move |gesture, _, _| {
// Allow only left and middle button
if ![1, 2].contains(&gesture.current_button()) {
if ![1, 2].contains(&gesture.current_button())
// Drag gesture for touchscreens is handled by ScrolledWindow
|| gesture.device().map(|x| x.source()) == Some(gdk::InputSource::Touchscreen)
{
gesture.set_state(gtk::EventSequenceState::Denied);
return;
}
if obj.is_hscrollable() || obj.is_vscrollable() {
obj.cancel_deceleration();
gesture.set_state(gtk::EventSequenceState::Claimed);
obj.set_cursor(gdk::Cursor::from_name("grabbing", None).as_ref());
obj.imp().last_drag_value.set(Some((0., 0.)));
} else {