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Rename InputEvent::MouseLeave to InputEvent::MouseLeftViewport (#38695)

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1. `InputEvent::MouseLeave` indicates that mouse has left the viewport
(fired by embedder) or iframe (synthesized in Constellation
f24f225db8/components/constellation/constellation_webview.rs (L119-L122)).
Its handler in script is named as `handle_mouse_leave_event`, which is
very misleading as we have DOM event
[mouseleave](https://w3c.github.io/uievents/#event-type-mouseleave). I
rename it to `MouseLeftViewport` to be consistent with
`WindowEvent::CursorLeft`:
f24f225db8/ports/servoshell/desktop/headed_window.rs (L632-L638)
2. Add doc and rename function, such as `handle_mouse_move_event` to
`handle_native_mouse_move_event` to be closer to
[spec](https://w3c.github.io/uievents/#handle-native-mouse-move).

Testing: Just renaming + skipping unnecessary hit-test in simple case.
Fixes: Nothing but preparing for #38670 and #38435.

---------

Signed-off-by: Euclid Ye <euclid.ye@huawei.com>
This commit is contained in:
Euclid Ye 2025-08-15 17:54:54 +08:00 • committed by GitHub
parent 8b574539d1
commit 494493ceb7
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GPG key ID: B5690EEEBB952194
6 changed files with 33 additions and 27 deletions
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23
components/script/dom/document_event_handler.rs
View file

@ -14,7 +14,7 @@ use embedder_traits::{
Cursor, EditingActionEvent, EmbedderMsg, GamepadEvent as EmbedderGamepadEvent,
GamepadSupportedHapticEffects, GamepadUpdateType, ImeEvent, InputEvent,
KeyboardEvent as EmbedderKeyboardEvent, MouseButton, MouseButtonAction, MouseButtonEvent,
MouseLeaveEvent, ScrollEvent, TouchEvent as EmbedderTouchEvent, TouchEventType, TouchId,
MouseLeftViewportEvent, ScrollEvent, TouchEvent as EmbedderTouchEvent, TouchEventType, TouchId,
UntrustedNodeAddress, WheelEvent as EmbedderWheelEvent,
};
use euclid::Point2D;
@ -160,13 +160,13 @@ impl DocumentEventHandler {
match event.event.clone() {
InputEvent::MouseButton(mouse_button_event) => {
self.handle_mouse_button_event(mouse_button_event, &event, can_gc);
self.handle_native_mouse_button_event(mouse_button_event, &event, can_gc);
},
InputEvent::MouseMove(_) => {
self.handle_mouse_move_event(&event, can_gc);
self.handle_native_mouse_move_event(&event, can_gc);
},
InputEvent::MouseLeave(mouse_leave_event) => {
self.handle_mouse_leave_event(&event, &mouse_leave_event, can_gc);
InputEvent::MouseLeftViewport(mouse_leave_event) => {
self.handle_mouse_left_viewport_event(&event, &mouse_leave_event, can_gc);
},
InputEvent::Touch(touch_event) => {
self.handle_touch_event(touch_event, &event, can_gc);
@ -221,10 +221,10 @@ impl DocumentEventHandler {
.send_to_embedder(EmbedderMsg::SetCursor(self.window.webview_id(), cursor));
}
fn handle_mouse_leave_event(
fn handle_mouse_left_viewport_event(
&self,
input_event: &ConstellationInputEvent,
mouse_leave_event: &MouseLeaveEvent,
mouse_leave_event: &MouseLeftViewportEvent,
can_gc: CanGc,
) {
if let Some(current_hover_target) = self.current_hover_target.get() {
@ -328,7 +328,8 @@ impl DocumentEventHandler {
}
}
fn handle_mouse_move_event(&self, input_event: &ConstellationInputEvent, can_gc: CanGc) {
/// <https://w3c.github.io/uievents/#handle-native-mouse-move>
fn handle_native_mouse_move_event(&self, input_event: &ConstellationInputEvent, can_gc: CanGc) {
// Ignore all incoming events without a hit test.
let Some(hit_test_result) = self.window.hit_test_from_input_event(input_event) else {
return;
@ -349,8 +350,7 @@ impl DocumentEventHandler {
let target_has_changed = self
.current_hover_target
.get()
.as_ref()
.is_none_or(|old_target| old_target != &new_target);
.is_none_or(|old_target| old_target != new_target);
// Here we know the target has changed, so we must update the state,
// dispatch mouseout to the previous one, mouseover to the new one.
@ -503,7 +503,8 @@ impl DocumentEventHandler {
}
/// <https://w3c.github.io/uievents/#mouseevent-algorithms>
fn handle_mouse_button_event(
/// Handles native mouse down, mouse up, mouse click.
fn handle_native_mouse_button_event(
&self,
event: MouseButtonEvent,
input_event: &ConstellationInputEvent,