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Add comment to explain callback ordering

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Glenn Watson 2016-01-27 09:25:20 +10:00
parent dfaf28d5cd
commit de81d88324
1 changed files with 4 additions and 0 deletions
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4
components/script/dom/document.rs
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@ -1208,6 +1208,10 @@ impl Document {
callback(*timing); callback(*timing);
} }
// Only send the animation change state message after running any callbacks.
// This means that if the animation callback adds a new callback for
// the next frame (which is the common case), we won't send a NoAnimationCallbacksPresent
// message quickly followed by an AnimationCallbacksPresent message.
if self.animation_frame_list.borrow().is_empty() { if self.animation_frame_list.borrow().is_empty() {
let ConstellationChan(ref chan) = self.window.constellation_chan(); let ConstellationChan(ref chan) = self.window.constellation_chan();
let event = ConstellationMsg::ChangeRunningAnimationsState(self.window.pipeline(), let event = ConstellationMsg::ChangeRunningAnimationsState(self.window.pipeline(),