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ui: Move view with middle mouse button.

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This commit is contained in:
Denis Drakhnia 2023-11-17 08:01:34 +02:00
parent 96c079d29e
commit e78d6f5fb4
1 changed files with 47 additions and 0 deletions
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47
src/ui/graph/graph_view.rs
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@ -93,6 +93,9 @@ mod imp {
// Memorized data for an in-progress zoom gesture
pub zoom_gesture_initial_zoom: Cell<Option<f64>>,
pub zoom_gesture_anchor: Cell<Option<(f64, f64)>>,
// This keeps track of an ongoing move view gesture.
pub move_view_state: Cell<(f64, f64)>,
}
impl Default for GraphView {
@ -108,6 +111,7 @@ mod imp {
port_drag_cursor: Cell::new(Point::new(0.0, 0.0)),
zoom_gesture_initial_zoom: Default::default(),
zoom_gesture_anchor: Default::default(),
move_view_state: Default::default(),
}
}
}
@ -136,6 +140,7 @@ mod imp {
self.setup_port_drag_and_drop();
self.setup_scroll_zooming();
self.setup_zoom_gesture();
self.setup_move_view();
}
fn dispose(&self) {
@ -465,6 +470,48 @@ mod imp {
self.obj().add_controller(zoom_gesture);
}
fn setup_move_view(&self) {
let drag_controller = gtk::GestureDrag::new();
drag_controller.set_button(gtk::gdk::BUTTON_MIDDLE);
// TODO: set `all-scroll` cursor while dragging view
drag_controller.connect_drag_begin(|drag_controller, _, _| {
let widget = drag_controller
.widget()
.downcast::<super::GraphView>()
.unwrap();
widget.imp().move_view_state.set((0.0, 0.0));
});
drag_controller.connect_drag_update(|drag_controller, x, y| {
let widget = drag_controller
.widget()
.downcast::<super::GraphView>()
.unwrap();
let imp = widget.imp();
let state = imp.move_view_state.replace((x, y));
let delta_x = state.0 - x;
let delta_y = state.1 - y;
let hadjustment_ref = imp.hadjustment.borrow();
let vadjustment_ref = imp.vadjustment.borrow();
let hadjustment = hadjustment_ref.as_ref().unwrap();
let vadjustment = vadjustment_ref.as_ref().unwrap();
let new_hadjustment = hadjustment.value() + delta_x;
let new_vadjustment = vadjustment.value() + delta_y;
hadjustment.set_value(new_hadjustment);
vadjustment.set_value(new_vadjustment);
});
self.obj().add_controller(drag_controller);
}
fn draw_link(
&self,
link_cr: &cairo::Context,