void
ServoRestyleManager::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
MOZ_ASSERT(!(aMinChangeHint & nsChangeHint_NeutralChange),
"Didn't expect explicit change hints to be neutral!");
if (MOZ_UNLIKELY(IsDisconnected()) ||
MOZ_UNLIKELY(PresContext()->PresShell()->IsDestroying())) {
return;
}
// We allow posting restyles from within change hint handling, but not from
// within the restyle algorithm itself.
MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal());
if (aRestyleHint == 0 && !aMinChangeHint) {
return; // Nothing to do.
}
// Processing change hints sometimes causes new change hints to be generated,
// and very occasionally, additional restyle hints. We collect the change
// hints manually to avoid re-traversing the DOM to find them.
if (mReentrantChanges && !aRestyleHint) {
mReentrantChanges->AppendElement(ReentrantChange { aElement, aMinChangeHint });
return;
}
if (aRestyleHint & ~eRestyle_AllHintsWithAnimations) {
mHaveNonAnimationRestyles = true;
}
Servo_NoteExplicitHints(aElement, aRestyleHint, aMinChangeHint);
}
void
ServoRestyleManager::AttributeChanged(Element* aElement, int32_t aNameSpaceID,
nsIAtom* aAttribute, int32_t aModType,
const nsAttrValue* aOldValue)
{
MOZ_ASSERT(!mInStyleRefresh);
MOZ_ASSERT_IF(mSnapshots.Get(aElement), mSnapshots.Get(aElement)->HasAttrs());
nsIFrame* primaryFrame = aElement->GetPrimaryFrame();
if (primaryFrame) {
primaryFrame->AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
nsChangeHint hint = aElement->GetAttributeChangeHint(aAttribute, aModType);
if (hint) {
PostRestyleEvent(aElement, nsRestyleHint(0), hint);
}
if (aAttribute == nsGkAtoms::style) {
PostRestyleEvent(aElement, eRestyle_StyleAttribute, nsChangeHint(0));
}
// <td> is affected by the cellpadding on its ancestor table,
// so we should restyle the whole subtree
if (aAttribute == nsGkAtoms::cellpadding && aElement->IsHTMLElement(nsGkAtoms::table)) {
PostRestyleEvent(aElement, eRestyle_Subtree, nsChangeHint(0));
}
if (aElement->IsAttributeMapped(aAttribute)) {
Servo_NoteExplicitHints(aElement, eRestyle_Self, nsChangeHint(0));
}
}
void
ServoRestyleManager::PostRestyleEvent(Element* aElement,
nsRestyleHint aRestyleHint,
nsChangeHint aMinChangeHint)
{
if (MOZ_UNLIKELY(IsDisconnected()) ||
MOZ_UNLIKELY(PresContext()->PresShell()->IsDestroying())) {
return;
}
if (aRestyleHint == 0 && !aMinChangeHint && !HasPendingRestyles()) {
return; // Nothing to do.
}
// We allow posting change hints during restyling, but not restyle hints
// themselves, since those would require us to re-traverse the tree.
MOZ_ASSERT_IF(mInStyleRefresh, aRestyleHint == 0);
// Processing change hints sometimes causes new change hints to be generated.
// Doing this after the gecko post-traversal is problematic, so instead we just
// queue them up for special handling.
if (mReentrantChanges) {
MOZ_ASSERT(aRestyleHint == 0);
mReentrantChanges->AppendElement(ReentrantChange { aElement, aMinChangeHint });
return;
}
// XXX This is a temporary hack to make style attribute change works.
// In the future, we should be able to use this hint directly.
if (aRestyleHint & eRestyle_StyleAttribute) {
aRestyleHint &= ~eRestyle_StyleAttribute;
aRestyleHint |= eRestyle_Self | eRestyle_Subtree;
}
// XXX For now, convert eRestyle_Subtree into (eRestyle_Self |
// eRestyle_SomeDescendants), which Servo will interpret as
// RESTYLE_SELF | RESTYLE_DESCENDANTS, since this is a commonly
// posted restyle hint that doesn't yet align with RestyleHint's
// bits.
if (aRestyleHint & eRestyle_Subtree) {
aRestyleHint &= ~eRestyle_Subtree;
aRestyleHint |= eRestyle_Self | eRestyle_SomeDescendants;
}
if (aRestyleHint || aMinChangeHint) {
Servo_NoteExplicitHints(aElement, aRestyleHint, aMinChangeHint);
}
PostRestyleEventInternal(false);
}
/* static */ void
ServoRestyleManager::PostRestyleEventForAnimations(Element* aElement,
nsRestyleHint aRestyleHint)
{
Servo_NoteExplicitHints(aElement, aRestyleHint, nsChangeHint(0));
}