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style: Break needs_animations_update into pieces.

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To hopefully make some sense out of it.
This commit is contained in:
Emilio Cobos Álvarez 2018-02-24 22:43:00 +01:00
parent e30a4d2ad2
commit f2a808ad58
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1 changed files with 35 additions and 18 deletions
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53
components/style/matching.rs
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@ -238,26 +238,43 @@ trait PrivateMatchMethods: TElement {
None => return has_new_animation_style,
};
let has_animations = self.has_css_animations();
let old_box_style = old.get_box();
let old_display_style = old_box_style.clone_display();
let new_display_style = new_box_style.clone_display();
// If the traverse is triggered by CSS rule changes, we need to
// try to update all CSS animations on the element if the element
// has or will have CSS animation style regardless of whether the
// animation is running or not.
// TODO: We should check which @keyframes changed/added/deleted
// and update only animations corresponding to those @keyframes.
(context.shared.traversal_flags.contains(TraversalFlags::ForCSSRuleChanges) &&
(has_new_animation_style || has_animations)) ||
!old_box_style.animations_equals(new_box_style) ||
(old_display_style == Display::None &&
new_display_style != Display::None &&
has_new_animation_style) ||
(old_display_style != Display::None &&
new_display_style == Display::None &&
has_animations)
let keyframes_could_have_changed =
context.shared.traversal_flags.contains(TraversalFlags::ForCSSRuleChanges);
// If the traversal is triggered due to changes in CSS rules changes, we
// need to try to update all CSS animations on the element if the
// element has or will have CSS animation style regardless of whether
// the animation is running or not.
//
// TODO: We should check which @keyframes were added/changed/deleted and
// update only animations corresponding to those @keyframes.
if keyframes_could_have_changed &&
(has_new_animation_style || self.has_css_animations())
{
return true;
}
// If the animations changed, well...
if !old_box_style.animations_equals(new_box_style) {
return true;
}
let old_display = old_box_style.clone_display();
let new_display = new_box_style.clone_display();
// If we were display: none, we may need to trigger animations.
if old_display == Display::None && new_display != Display::None {
return has_new_animation_style;
}
// If we are becoming display: none, we may need to stop animations.
if old_display != Display::None && new_display == Display::None {
return self.has_css_animations();
}
false
}
/// Create a SequentialTask for resolving descendants in a SMIL display property