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Rework ScriptThread::handle_input_event for behaviour and performance (#36619)

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Rework `ScriptThread::handle_input_event` for correct behaviour and
better performance
1. Only trigger click event with primary button, according to spec
2. Avoid unnecessary clone of `ConstellationInputEvent`

This is a follow up of #36413 

Testing: Manually tested. Right mouse won't trigger click event now.
Fixes: #35666 
cc @jdm @xiaochengh

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>
This commit is contained in:
Euclid Ye 2025-04-21 11:34:39 +08:00 • committed by GitHub
parent 76ee127af8
commit 990ed8891f
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2 changed files with 31 additions and 33 deletions
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62
components/script/script_thread.rs
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@ -336,11 +336,6 @@ pub struct ScriptThread {
#[no_trace]
layout_factory: Arc<dyn LayoutFactory>,
// Mouse down button: TO BE REMOVED. Not needed as click event should only
// triggered for primary button
#[no_trace]
mouse_down_button: Cell<Option<MouseButton>>,
// Mouse down point.
// In future, this shall be mouse_down_point for primary button
#[no_trace]
@ -959,7 +954,6 @@ impl ScriptThread {
gpu_id_hub: Arc::new(IdentityHub::default()),
inherited_secure_context: state.inherited_secure_context,
layout_factory,
mouse_down_button: Cell::new(None),
relative_mouse_down_point: Cell::new(Point2D::zero()),
}
}
@ -3354,14 +3348,6 @@ impl ScriptThread {
return;
};
if let InputEvent::MouseButton(mouse_button_event) = event.event {
if mouse_button_event.action == MouseButtonAction::Down {
self.mouse_down_button.set(Some(mouse_button_event.button));
self.relative_mouse_down_point.set(mouse_button_event.point)
}
}
document.note_pending_input_event(event.clone());
// Also send a 'click' event with same hit-test result if this is release
// MAYBE? TODO: https://developer.mozilla.org/en-US/docs/Web/API/Element/click_event
@ -3370,30 +3356,42 @@ impl ScriptThread {
// that contained both elements.
// But spec doesn't specify this https://w3c.github.io/uievents/#event-type-click
// "The click event type MUST be dispatched on the topmost event target indicated by
// the pointer, when the user presses down and releases the primary pointer button"
// Servo-specific: Trigger if within 10px of the down point
if let InputEvent::MouseButton(mouse_button_event) = event.event {
if let (Some(mouse_down_button), MouseButtonAction::Up) =
(self.mouse_down_button.get(), mouse_button_event.action)
{
let pixel_dist = self.relative_mouse_down_point.get() - mouse_button_event.point;
let pixel_dist = (pixel_dist.x * pixel_dist.x + pixel_dist.y * pixel_dist.y).sqrt();
if mouse_down_button == mouse_button_event.button &&
pixel_dist < 10.0 * document.window().device_pixel_ratio().get()
{
document.note_pending_input_event(ConstellationInputEvent {
hit_test_result: event.hit_test_result,
pressed_mouse_buttons: event.pressed_mouse_buttons,
active_keyboard_modifiers: event.active_keyboard_modifiers,
event: InputEvent::MouseButton(MouseButtonEvent {
action: MouseButtonAction::Click,
button: mouse_button_event.button,
point: mouse_button_event.point,
}),
});
if let MouseButton::Left = mouse_button_event.button {
match mouse_button_event.action {
MouseButtonAction::Up => {
let pixel_dist =
self.relative_mouse_down_point.get() - mouse_button_event.point;
let pixel_dist =
(pixel_dist.x * pixel_dist.x + pixel_dist.y * pixel_dist.y).sqrt();
if pixel_dist < 10.0 * document.window().device_pixel_ratio().get() {
document.note_pending_input_event(event.clone());
document.note_pending_input_event(ConstellationInputEvent {
hit_test_result: event.hit_test_result,
pressed_mouse_buttons: event.pressed_mouse_buttons,
active_keyboard_modifiers: event.active_keyboard_modifiers,
event: InputEvent::MouseButton(MouseButtonEvent {
action: MouseButtonAction::Click,
button: mouse_button_event.button,
point: mouse_button_event.point,
}),
});
return;
}
},
MouseButtonAction::Down => {
self.relative_mouse_down_point.set(mouse_button_event.point)
},
MouseButtonAction::Click => {},
}
}
}
document.note_pending_input_event(event);
}
/// Handle a "navigate an iframe" message from the constellation.