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Refactor mouseover code to be more performant

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This increases mouseover/out performance drastically on my machine.
This commit is contained in:
Emilio Cobos Álvarez 2016-02-24 17:37:11 +01:00
parent 73eff81e5d
commit 3662491d8f
3 changed files with 121 additions and 110 deletions
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148
components/script/dom/document.rs
View file

@ -798,81 +798,33 @@ impl Document {
pub fn handle_mouse_move_event(&self,
js_runtime: *mut JSRuntime,
client_point: Option<Point2D<f32>>,
prev_mouse_over_targets: &mut RootedVec<JS<Element>>) {
// Build a list of elements that are currently under the mouse.
let mouse_over_address = client_point.as_ref().map(|client_point| {
let page_point = Point2D::new(client_point.x + self.window.PageXOffset() as f32,
client_point.y + self.window.PageYOffset() as f32);
self.hit_test(&page_point, true)
}).unwrap_or(None);
prev_mouse_over_target: &MutNullableHeap<JS<Element>>) {
let page_point = match client_point {
None => {
// If there's no point, there's no target under the mouse
// FIXME: dispatch mouseout here. We have no point.
prev_mouse_over_target.set(None);
return;
}
Some(ref client_point) => {
Point2D::new(client_point.x + self.window.PageXOffset() as f32,
client_point.y + self.window.PageYOffset() as f32)
}
};
let mut mouse_over_targets = RootedVec::<JS<Element>>::new();
let client_point = client_point.unwrap();
if let Some(address) = mouse_over_address {
let maybe_new_target = self.hit_test(&page_point, true).and_then(|address| {
let node = node::from_untrusted_node_address(js_runtime, address);
for node in node.inclusive_ancestors()
.filter_map(Root::downcast::<Element>) {
mouse_over_targets.push(JS::from_rooted(&node));
}
}
// Werther the topmost element we are hovering now is diffrent than the previous
let is_different_topmost_target = mouse_over_targets.is_empty() ||
prev_mouse_over_targets.is_empty() ||
prev_mouse_over_targets[0].upcast::<Node>().to_trusted_node_address() !=
mouse_over_targets[0].upcast::<Node>().to_trusted_node_address();
// Remove hover from any elements in the previous list that are no longer
// under the mouse.
for (index, target) in prev_mouse_over_targets.iter().enumerate() {
// Hover state is reset as appropiate later
target.set_hover_state(false);
// https://www.w3.org/TR/uievents/#event-type-mouseout
//
// mouseout must be dispatched when the mouse moves off an element or when pointer
// mouse moves from an element onto the boundaries of one of its descendent elements.
let has_to_dispatch_mouse_out = index == 0 && is_different_topmost_target;
if has_to_dispatch_mouse_out {
let target = target.upcast();
if let Some(client_point) = client_point {
self.fire_mouse_event(client_point, &target, "mouseout".to_owned());
}
}
}
// Set hover state for any elements in the current mouse over list.
// Check if any of them changed state to determine whether to
// force a reflow below.
for (index, target) in mouse_over_targets.r().iter().enumerate() {
target.set_hover_state(true);
// https://www.w3.org/TR/uievents/#event-type-mouseover
//
// Mouseover must be fired when a pointing device is moved onto the boundaries of an
// element (we only fire it in the first because it bubbles), or when the pointer has
// moved from our children to ours.
//
// The below condition adresses both situations.
let has_to_dispatch_mouse_over = index == 0 && is_different_topmost_target;
if has_to_dispatch_mouse_over {
let target = target.upcast();
if let Some(client_point) = client_point {
self.fire_mouse_event(client_point, target, "mouseover".to_owned());
}
}
}
// Send mousemove event to topmost target
if let Some(address) = mouse_over_address {
let top_most_node = node::from_untrusted_node_address(js_runtime,
address);
let client_point = client_point.unwrap(); // Must succeed because hit test succeeded.
node.inclusive_ancestors()
.filter_map(Root::downcast::<Element>)
.next()
});
// Send mousemove event to topmost target, and forward it if it's an iframe
if let Some(ref new_target) = maybe_new_target {
// If the target is an iframe, forward the event to the child document.
if let Some(iframe) = top_most_node.downcast::<HTMLIFrameElement>() {
if let Some(iframe) = new_target.downcast::<HTMLIFrameElement>() {
if let Some(pipeline_id) = iframe.pipeline_id() {
let rect = iframe.upcast::<Element>().GetBoundingClientRect();
let child_origin = Point2D::new(rect.X() as f32, rect.Y() as f32);
@ -884,13 +836,59 @@ impl Document {
return;
}
let target = top_most_node.upcast();
self.fire_mouse_event(client_point, target, "mousemove".to_owned());
self.fire_mouse_event(client_point, new_target.upcast(), "mousemove".to_owned());
}
// Store the current mouse over targets for next frame
prev_mouse_over_targets.clear();
prev_mouse_over_targets.append(&mut *mouse_over_targets);
// Nothing more to do here, mousemove is sent,
// and the element under the mouse hasn't changed.
if maybe_new_target == prev_mouse_over_target.get() {
return;
}
let old_target_is_ancestor_of_new_target = match (prev_mouse_over_target.get(), maybe_new_target.as_ref()) {
(Some(old_target), Some(new_target))
=> old_target.upcast::<Node>().is_ancestor_of(new_target.upcast::<Node>()),
_ => false,
};
// Here we know the target has changed, so we must update the state,
// dispatch mouseout to the previous one, mouseover to the new one,
if let Some(old_target) = prev_mouse_over_target.get() {
// If the old target is an ancestor of the new target, this can be skipped
// completely, since the node's hover state will be reseted below.
if !old_target_is_ancestor_of_new_target {
for element in old_target.upcast::<Node>()
.inclusive_ancestors()
.filter_map(Root::downcast::<Element>) {
element.set_hover_state(false);
}
}
// Remove hover state to old target and its parents
self.fire_mouse_event(client_point, old_target.upcast(), "mouseout".to_owned());
// TODO: Fire mouseleave here only if the old target is
// not an ancestor of the new target.
}
if let Some(ref new_target) = maybe_new_target {
for element in new_target.upcast::<Node>()
.inclusive_ancestors()
.filter_map(Root::downcast::<Element>) {
if element.get_hover_state() {
break;
}
element.set_hover_state(true);
}
self.fire_mouse_event(client_point, &new_target.upcast(), "mouseover".to_owned());
// TODO: Fire mouseenter here.
}
// Store the current mouse over target for next frame.
prev_mouse_over_target.set(maybe_new_target.as_ref().map(|target| target.r()));
self.window.reflow(ReflowGoal::ForDisplay,
ReflowQueryType::NoQuery,