C++ TreeScope::scopedStyleResolver方法代码示例

ScopedStyleResolver* ScopedStyleResolver::parent() const
{
    for (TreeScope* scope = treeScope().parentTreeScope(); scope; scope = scope->parentTreeScope()) {
        if (ScopedStyleResolver* resolver = scope->scopedStyleResolver())
            return resolver;
    }
    return nullptr;
}

void StyleEngine::updateActiveStyleSheets(StyleResolverUpdateMode updateMode)
{
    ASSERT(isMaster());
    ASSERT(!document().inStyleRecalc());

    if (!document().isActive())
        return;

    if (shouldUpdateDocumentStyleSheetCollection(updateMode))
        documentStyleSheetCollection()->updateActiveStyleSheets(this, updateMode);

    if (shouldUpdateShadowTreeStyleSheetCollection(updateMode)) {
        TreeScopeSet treeScopes = updateMode == FullStyleUpdate ? m_activeTreeScopes : m_dirtyTreeScopes;
        HashSet<TreeScope*> treeScopesRemoved;

        for (TreeScopeSet::iterator it = treeScopes.begin(); it != treeScopes.end(); ++it) {
            TreeScope* treeScope = *it;
            ASSERT(treeScope != m_document);
            ShadowTreeStyleSheetCollection* collection = static_cast<ShadowTreeStyleSheetCollection*>(styleSheetCollectionFor(*treeScope));
            ASSERT(collection);
            collection->updateActiveStyleSheets(this, updateMode);
            if (!collection->hasStyleSheetCandidateNodes()) {
                treeScopesRemoved.add(treeScope);
                // When removing TreeScope from ActiveTreeScopes,
                // its resolver should be destroyed by invoking resetAuthorStyle.
                ASSERT(!treeScope->scopedStyleResolver());
            }
        }
        m_activeTreeScopes.removeAll(treeScopesRemoved);
    }

    InspectorInstrumentation::activeStyleSheetsUpdated(m_document);
    m_usesRemUnits = documentStyleSheetCollection()->usesRemUnits();

    m_dirtyTreeScopes.clear();
    m_documentScopeDirty = false;
}

void ScopedStyleResolver::keyframesRulesAdded(const TreeScope& treeScope) {
  // Called when @keyframes rules are about to be added/removed from a
  // TreeScope. @keyframes rules may apply to animations on elements in the
  // same TreeScope as the stylesheet, or the host element in the parent
  // TreeScope if the TreeScope is a shadow tree.

  ScopedStyleResolver* resolver = treeScope.scopedStyleResolver();
  ScopedStyleResolver* parentResolver =
      treeScope.parentTreeScope()
          ? treeScope.parentTreeScope()->scopedStyleResolver()
          : nullptr;

  bool hadUnresolvedKeyframes = false;
  if (resolver && resolver->m_hasUnresolvedKeyframesRule) {
    resolver->m_hasUnresolvedKeyframesRule = false;
    hadUnresolvedKeyframes = true;
  }
  if (parentResolver && parentResolver->m_hasUnresolvedKeyframesRule) {
    parentResolver->m_hasUnresolvedKeyframesRule = false;
    hadUnresolvedKeyframes = true;
  }

  if (hadUnresolvedKeyframes) {
    // If an animation ended up not being started because no @keyframes
    // rules were found for the animation-name, we need to recalculate style
    // for the elements in the scope, including its shadow host if
    // applicable.
    invalidationRootForTreeScope(treeScope).setNeedsStyleRecalc(
        SubtreeStyleChange, StyleChangeReasonForTracing::create(
                                StyleChangeReason::StyleSheetChange));
    return;
  }

  // If we have animations running, added/removed @keyframes may affect these.
  treeScope.document().timeline().invalidateKeyframeEffects(treeScope);
}