void
nsTransitionManager::UpdateAllThrottledStyles()
{
if (PR_CLIST_IS_EMPTY(&mElementData)) {
// no throttled transitions, leave early
mPresContext->TickLastUpdateThrottledStyle();
return;
}
if (mPresContext->ThrottledStyleIsUpToDate()) {
// throttled transitions are up to date, leave early
return;
}
mPresContext->TickLastUpdateThrottledStyle();
TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
nsStyleChangeList changeList;
// update each transitioning element by finding its root-most ancestor with a
// transition, and flushing the style on that ancestor and all its descendants
PRCList *next = PR_LIST_HEAD(&mElementData);
while (next != &mElementData) {
ElementTransitions* et = static_cast<ElementTransitions*>(next);
next = PR_NEXT_LINK(next);
if (et->mFlushGeneration == now) {
// this element has been ticked already
continue;
}
// element is initialised to the starting element (i.e., one we know has
// a transition) and ends up with the root-most transitioning ancestor,
// that is, the element where we begin updates.
dom::Element* element = et->mElement;
// make a list of ancestors
nsTArray<dom::Element*> ancestors;
do {
ancestors.AppendElement(element);
} while ((element = element->GetParentElement()));
// walk down the ancestors until we find one with a throttled transition
for (int32_t i = ancestors.Length() - 1; i >= 0; --i) {
if (GetElementTransitions(ancestors[i],
nsCSSPseudoElements::ePseudo_NotPseudoElement,
false)) {
element = ancestors[i];
break;
}
}
nsIFrame* primaryFrame;
if (element &&
(primaryFrame = nsLayoutUtils::GetStyleFrame(element))) {
UpdateThrottledStylesForSubtree(element,
primaryFrame->StyleContext()->GetParent(), changeList);
}
}
RestyleManager* restyleManager = mPresContext->RestyleManager();
restyleManager->ProcessRestyledFrames(changeList);
restyleManager->FlushOverflowChangedTracker();
}
