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style: Make sure to set the initial value of the transition even if we don't start it.

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Otherwise we may get to the end of it directly, which is far from what we want.
This commit is contained in:
Emilio Cobos Álvarez 2017-08-20 23:37:38 +02:00
parent 359ef7b7c3
commit 293274fa5e
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1 changed files with 12 additions and 10 deletions
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22
components/style/animation.rs
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@ -437,21 +437,23 @@ pub fn start_transitions_if_applicable(new_animations_sender: &Sender<Animation>
old_style,
Arc::make_mut(new_style));
for property_animation in property_animations {
// Per [1], don't trigger a new transition if the end state for that transition is
// the same as that of a transition that's already running on the same node.
//
// [1]: https://drafts.csswg.org/css-transitions/#starting
if possibly_expired_animations.iter().any(|animation| {
animation.has_the_same_end_value_as(&property_animation)
}) {
continue
}
// Set the property to the initial value.
//
// NB: get_mut is guaranteed to succeed since we called make_mut()
// above.
property_animation.update(Arc::get_mut(new_style).unwrap(), 0.0);
// Per [1], don't trigger a new transition if the end state for that
// transition is the same as that of a transition that's already
// running on the same node.
//
// [1]: https://drafts.csswg.org/css-transitions/#starting
if possibly_expired_animations.iter().any(|animation| {
animation.has_the_same_end_value_as(&property_animation)
}) {
continue
}
// Kick off the animation.
let box_style = new_style.get_box();
let now = timer.seconds();