Timeline: a press in the time ruler moves the current time (#284)

The ruler moved the current-time indicator only once the pointer had
dragged past egui's drag threshold, or on release for a click. As in
After Effects, the time now jumps to the pointer as soon as the button
goes down in the ruler, then follows the drag.

Test: a_press_in_the_ruler_moves_the_current_time (ui_timeline_zoom).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/ui-egui/src/panels/timeline.rs

@@ -1320,9 +1320,10 @@ pub fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, rect: Rect) {
         }
         s += secs_per_label;
     }
-    // Scrub in the ruler.
+    // Scrub in the ruler: the current time jumps to the pointer as soon as the button goes down
+    // (After Effects), then follows it.
     let rresp = ui.interact(Rect::from_min_max(pos2(graph_x0, ruler.min.y + 12.0), ruler.max), egui::Id::new("tl-ruler"), Sense::click_and_drag());
-    if (rresp.dragged() || rresp.clicked())
+    if ((rresp.is_pointer_button_down_on() && ui.input(|i| i.pointer.primary_down())) || rresp.clicked())
         && let Some(pt) = rresp.interact_pointer_pos()
     {
         let mut secs = tm.t(pt.x).max(0.0);

crates/ui-egui/tests/ui_timeline_zoom.rs

@@ -213,3 +213,31 @@ fn shift_dragging_the_work_area_snaps_to_the_current_time() {
     drag_with(&mut h, mid, to, Modifiers::SHIFT);
     assert!(near(work_area(&h), (3.0, 6.0)), "the bar snaps its end to the CTI: {:?}", work_area(&h));
 }
+
+/// #284: pressing in the time ruler moves the current time there at once, before the pointer
+/// moves or the button comes up (After Effects); dragging on then scrubs.
+#[test]
+fn a_press_in_the_ruler_moves_the_current_time() {
+    let (mut h, _) = harness();
+    // (Opening the comp showed all of it.)
+    h.state_mut().ui.timeline.pps = Some(200.0);
+    h.state_mut().ui.timeline.start = 10.0;
+    h.run_steps(2);
+    let ruler = rect(&h, "timeline.ruler");
+    let (start, _) = visible(&h);
+    // 2 s into the visible span at 200 px/s (the ruler maps time from 6 px in).
+    let at = pos2(ruler.min.x + 6.0 + 400.0, ruler.min.y + 17.0);
+    h.event(Event::PointerMoved(at));
+    h.step();
+    h.event(Event::PointerButton { pos: at, button: egui::PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+    h.step();
+    let now = h.state().session.time().seconds();
+    assert!((now - (start + 2.0)).abs() < 0.05, "the press moved the CTI to {}: {now}", start + 2.0);
+    // Still held: dragging scrubs on.
+    h.event(Event::PointerMoved(at + vec2(100.0, 0.0)));
+    h.step();
+    let now = h.state().session.time().seconds();
+    assert!((now - (start + 2.5)).abs() < 0.05, "{now}");
+    h.event(Event::PointerButton { pos: at + vec2(100.0, 0.0), button: egui::PointerButton::Primary, pressed: false, modifiers: Modifiers::NONE });
+    h.step();
+}