/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * the container for the style sheets that apply to a presentation, and * the internal API that the style system exposes for creating (and * potentially re-creating) style contexts */ #include "mozilla/Util.h" #include "nsStyleSet.h" #include "nsNetUtil.h" #include "nsCSSStyleSheet.h" #include "nsIDocument.h" #include "nsRuleWalker.h" #include "nsStyleContext.h" #include "mozilla/css/StyleRule.h" #include "nsCSSAnonBoxes.h" #include "nsCSSPseudoElements.h" #include "nsCSSRuleProcessor.h" #include "nsIContent.h" #include "nsRuleData.h" #include "nsRuleProcessorData.h" #include "nsTransitionManager.h" #include "nsAnimationManager.h" #include "nsEventStates.h" #include "nsStyleSheetService.h" #include "mozilla/dom/Element.h" #include "sampler.h" using namespace mozilla; using namespace mozilla::dom; NS_IMPL_ISUPPORTS1(nsEmptyStyleRule, nsIStyleRule) /* virtual */ void nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { } #ifdef DEBUG /* virtual */ void nsEmptyStyleRule::List(FILE* out, int32_t aIndent) const { } #endif NS_IMPL_ISUPPORTS1(nsInitialStyleRule, nsIStyleRule) /* virtual */ void nsInitialStyleRule::MapRuleInfoInto(nsRuleData* aRuleData) { // Iterate over the property groups for (nsStyleStructID sid = nsStyleStructID(0); sid < nsStyleStructID_Length; sid = nsStyleStructID(sid + 1)) { if (aRuleData->mSIDs & (1 << sid)) { // Iterate over nsCSSValues within the property group nsCSSValue * const value_start = aRuleData->mValueStorage + aRuleData->mValueOffsets[sid]; for (nsCSSValue *value = value_start, *value_end = value + nsCSSProps::PropertyCountInStruct(sid); value != value_end; ++value) { // If MathML is disabled take care not to set MathML properties (or we // will trigger assertions in nsRuleNode) if (sid == eStyleStruct_Font && !aRuleData->mPresContext->Document()->GetMathMLEnabled()) { size_t index = value - value_start; if (index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_script_level) || index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_script_size_multiplier) || index == nsCSSProps::PropertyIndexInStruct( eCSSProperty_script_min_size)) { continue; } } if (value->GetUnit() == eCSSUnit_Null) { value->SetInitialValue(); } } } } } #ifdef DEBUG /* virtual */ void nsInitialStyleRule::List(FILE* out, int32_t aIndent) const { } #endif static const nsStyleSet::sheetType gCSSSheetTypes[] = { nsStyleSet::eAgentSheet, nsStyleSet::eUserSheet, nsStyleSet::eDocSheet, nsStyleSet::eOverrideSheet }; nsStyleSet::nsStyleSet() : mRuleTree(nullptr), mBatching(0), mInShutdown(false), mAuthorStyleDisabled(false), mInReconstruct(false), mDirty(0), mUnusedRuleNodeCount(0) { } size_t nsStyleSet::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const { size_t n = aMallocSizeOf(this); for (int i = 0; i < eSheetTypeCount; i++) { if (mRuleProcessors[i]) { n += mRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf); } } return n; } nsresult nsStyleSet::Init(nsPresContext *aPresContext) { mFirstLineRule = new nsEmptyStyleRule; mFirstLetterRule = new nsEmptyStyleRule; if (!mFirstLineRule || !mFirstLetterRule) { return NS_ERROR_OUT_OF_MEMORY; } if (!BuildDefaultStyleData(aPresContext)) { mDefaultStyleData.Destroy(0, aPresContext); return NS_ERROR_OUT_OF_MEMORY; } mRuleTree = nsRuleNode::CreateRootNode(aPresContext); if (!mRuleTree) { mDefaultStyleData.Destroy(0, aPresContext); return NS_ERROR_OUT_OF_MEMORY; } GatherRuleProcessors(eAnimationSheet); GatherRuleProcessors(eTransitionSheet); return NS_OK; } nsresult nsStyleSet::BeginReconstruct() { NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?"); NS_ASSERTION(mRuleTree, "Reconstructing before first construction?"); // Create a new rule tree root nsRuleNode* newTree = nsRuleNode::CreateRootNode(mRuleTree->GetPresContext()); if (!newTree) return NS_ERROR_OUT_OF_MEMORY; // Save the old rule tree so we can destroy it later if (!mOldRuleTrees.AppendElement(mRuleTree)) { newTree->Destroy(); return NS_ERROR_OUT_OF_MEMORY; } // We need to keep mRoots so that the rule tree GC will only free the // rule trees that really aren't referenced anymore (which should be // all of them, if there are no bugs in reresolution code). mInReconstruct = true; mRuleTree = newTree; return NS_OK; } void nsStyleSet::EndReconstruct() { NS_ASSERTION(mInReconstruct, "Unmatched begin/end?"); mInReconstruct = false; #ifdef DEBUG for (int32_t i = mRoots.Length() - 1; i >= 0; --i) { nsRuleNode *n = mRoots[i]->GetRuleNode(); while (n->GetParent()) { n = n->GetParent(); } // Since nsStyleContext's mParent and mRuleNode are immutable, and // style contexts own their parents, and nsStyleContext asserts in // its constructor that the style context and its parent are in the // same rule tree, we don't need to check any of the children of // mRoots; we only need to check the rule nodes of mRoots // themselves. NS_ASSERTION(n == mRuleTree, "style context has old rule node"); } #endif // This *should* destroy the only element of mOldRuleTrees, but in // case of some bugs (which would trigger the above assertions), it // won't. GCRuleTrees(); } void nsStyleSet::SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet) { NS_ASSERTION(aQuirkStyleSheet, "Must have quirk sheet if this is called"); NS_ASSERTION(!mQuirkStyleSheet, "Multiple calls to SetQuirkStyleSheet?"); NS_ASSERTION(mSheets[eAgentSheet].IndexOf(aQuirkStyleSheet) != -1, "Quirk style sheet not one of our agent sheets?"); mQuirkStyleSheet = aQuirkStyleSheet; } nsresult nsStyleSet::GatherRuleProcessors(sheetType aType) { mRuleProcessors[aType] = nullptr; if (mAuthorStyleDisabled && (aType == eDocSheet || aType == ePresHintSheet || aType == eStyleAttrSheet)) { //don't regather if this level is disabled return NS_OK; } if (aType == eAnimationSheet) { // We have no sheet for the animations level; just a rule // processor. (XXX: We should probably do this for the other // non-CSS levels too!) mRuleProcessors[aType] = PresContext()->AnimationManager(); return NS_OK; } if (aType == eTransitionSheet) { // We have no sheet for the transitions level; just a rule // processor. (XXX: We should probably do this for the other // non-CSS levels too!) mRuleProcessors[aType] = PresContext()->TransitionManager(); return NS_OK; } if (mSheets[aType].Count()) { switch (aType) { case eAgentSheet: case eUserSheet: case eDocSheet: case eOverrideSheet: { // levels containing CSS stylesheets nsCOMArray& sheets = mSheets[aType]; nsTArray > cssSheets(sheets.Count()); for (int32_t i = 0, i_end = sheets.Count(); i < i_end; ++i) { nsRefPtr cssSheet = do_QueryObject(sheets[i]); NS_ASSERTION(cssSheet, "not a CSS sheet"); cssSheets.AppendElement(cssSheet); } mRuleProcessors[aType] = new nsCSSRuleProcessor(cssSheets, uint8_t(aType)); } break; default: // levels containing non-CSS stylesheets NS_ASSERTION(mSheets[aType].Count() == 1, "only one sheet per level"); mRuleProcessors[aType] = do_QueryInterface(mSheets[aType][0]); break; } } return NS_OK; } nsresult nsStyleSet::AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet) { NS_PRECONDITION(aSheet, "null arg"); NS_ASSERTION(aSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); mSheets[aType].RemoveObject(aSheet); if (!mSheets[aType].AppendObject(aSheet)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } nsresult nsStyleSet::PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet) { NS_PRECONDITION(aSheet, "null arg"); NS_ASSERTION(aSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); mSheets[aType].RemoveObject(aSheet); if (!mSheets[aType].InsertObjectAt(aSheet, 0)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } nsresult nsStyleSet::RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet) { NS_PRECONDITION(aSheet, "null arg"); NS_ASSERTION(aSheet->IsComplete(), "Incomplete sheet being removed from style set"); mSheets[aType].RemoveObject(aSheet); if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } nsresult nsStyleSet::ReplaceSheets(sheetType aType, const nsCOMArray &aNewSheets) { mSheets[aType].Clear(); if (!mSheets[aType].AppendObjects(aNewSheets)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(aType); mDirty |= 1 << aType; return NS_OK; } bool nsStyleSet::GetAuthorStyleDisabled() { return mAuthorStyleDisabled; } nsresult nsStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled) { if (aStyleDisabled == !mAuthorStyleDisabled) { mAuthorStyleDisabled = aStyleDisabled; BeginUpdate(); mDirty |= 1 << eDocSheet | 1 << ePresHintSheet | 1 << eStyleAttrSheet; return EndUpdate(); } return NS_OK; } // -------- Doc Sheets nsresult nsStyleSet::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument) { NS_PRECONDITION(aSheet && aDocument, "null arg"); NS_ASSERTION(aSheet->IsApplicable(), "Inapplicable sheet being placed in style set"); nsCOMArray& docSheets = mSheets[eDocSheet]; docSheets.RemoveObject(aSheet); nsStyleSheetService *sheetService = nsStyleSheetService::gInstance; // lowest index first int32_t newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet); int32_t count = docSheets.Count(); int32_t index; for (index = 0; index < count; index++) { nsIStyleSheet* sheet = docSheets.ObjectAt(index); int32_t sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet); if (sheetDocIndex > newDocIndex) break; // If the sheet is not owned by the document it can be an author // sheet registered at nsStyleSheetService, which means the new // doc sheet should end up before it. if (sheetDocIndex < 0 && sheetService && sheetService->AuthorStyleSheets()->IndexOf(sheet) >= 0) break; } if (!docSheets.InsertObjectAt(aSheet, index)) return NS_ERROR_OUT_OF_MEMORY; if (!mBatching) return GatherRuleProcessors(eDocSheet); mDirty |= 1 << eDocSheet; return NS_OK; } // Batching void nsStyleSet::BeginUpdate() { ++mBatching; } nsresult nsStyleSet::EndUpdate() { NS_ASSERTION(mBatching > 0, "Unbalanced EndUpdate"); if (--mBatching) { // We're not completely done yet. return NS_OK; } for (int i = 0; i < eSheetTypeCount; ++i) { if (mDirty & (1 << i)) { nsresult rv = GatherRuleProcessors(sheetType(i)); NS_ENSURE_SUCCESS(rv, rv); } } mDirty = 0; return NS_OK; } void nsStyleSet::EnableQuirkStyleSheet(bool aEnable) { #ifdef DEBUG bool oldEnabled; { nsCOMPtr domSheet = do_QueryInterface(mQuirkStyleSheet); domSheet->GetDisabled(&oldEnabled); oldEnabled = !oldEnabled; } #endif mQuirkStyleSheet->SetEnabled(aEnable); #ifdef DEBUG // This should always be OK, since SetEnabled should call // ClearRuleCascades. // Note that we can hit this codepath multiple times when document.open() // (potentially implied) happens multiple times. if (mRuleProcessors[eAgentSheet] && aEnable != oldEnabled) { static_cast(static_cast( mRuleProcessors[eAgentSheet]))->AssertQuirksChangeOK(); } #endif } template static bool EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData) { T* data = static_cast(aData); aProcessor->RulesMatching(data); return true; } static inline bool IsMoreSpecificThanAnimation(nsRuleNode *aRuleNode) { return !aRuleNode->IsRoot() && (aRuleNode->GetLevel() == nsStyleSet::eTransitionSheet || aRuleNode->IsImportantRule()); } static nsIStyleRule* GetAnimationRule(nsRuleNode *aRuleNode) { nsRuleNode *n = aRuleNode; while (IsMoreSpecificThanAnimation(n)) { n = n->GetParent(); } if (n->IsRoot() || n->GetLevel() != nsStyleSet::eAnimationSheet) { return nullptr; } return n->GetRule(); } static nsRuleNode* ReplaceAnimationRule(nsRuleNode *aOldRuleNode, nsIStyleRule *aOldAnimRule, nsIStyleRule *aNewAnimRule) { nsTArray moreSpecificNodes; nsRuleNode *n = aOldRuleNode; while (IsMoreSpecificThanAnimation(n)) { moreSpecificNodes.AppendElement(n); n = n->GetParent(); } if (aOldAnimRule) { NS_ABORT_IF_FALSE(n->GetRule() == aOldAnimRule, "wrong rule"); NS_ABORT_IF_FALSE(n->GetLevel() == nsStyleSet::eAnimationSheet, "wrong level"); n = n->GetParent(); } NS_ABORT_IF_FALSE(!IsMoreSpecificThanAnimation(n) && n->GetLevel() != nsStyleSet::eAnimationSheet, "wrong level"); if (aNewAnimRule) { n = n->Transition(aNewAnimRule, nsStyleSet::eAnimationSheet, false); } for (uint32_t i = moreSpecificNodes.Length(); i-- != 0; ) { nsRuleNode *oldNode = moreSpecificNodes[i]; n = n->Transition(oldNode->GetRule(), oldNode->GetLevel(), oldNode->IsImportantRule()); } return n; } /** * |GetContext| implements sharing of style contexts (not just the data * on the rule nodes) between siblings and cousins of the same * generation. (It works for cousins of the same generation since * |aParentContext| could itself be a shared context.) */ already_AddRefed nsStyleSet::GetContext(nsStyleContext* aParentContext, nsRuleNode* aRuleNode, // aVisitedRuleNode may be null; if it is null // it means that we don't need to force creation // of a StyleIfVisited. (But if we make one // because aParentContext has one, then aRuleNode // should be used.) nsRuleNode* aVisitedRuleNode, bool aIsLink, bool aIsVisitedLink, nsIAtom* aPseudoTag, nsCSSPseudoElements::Type aPseudoType, bool aDoAnimations, Element* aElementForAnimation) { NS_PRECONDITION((!aPseudoTag && aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement) || (aPseudoTag && nsCSSPseudoElements::GetPseudoType(aPseudoTag) == aPseudoType), "Pseudo mismatch"); if (aVisitedRuleNode == aRuleNode) { // No need to force creation of a visited style in this case. aVisitedRuleNode = nullptr; } // Ensure |aVisitedRuleNode != nullptr| corresponds to the need to // create an if-visited style context, and that in that case, we have // parentIfVisited set correctly. nsStyleContext *parentIfVisited = aParentContext ? aParentContext->GetStyleIfVisited() : nullptr; if (parentIfVisited) { if (!aVisitedRuleNode) { aVisitedRuleNode = aRuleNode; } } else { if (aVisitedRuleNode) { parentIfVisited = aParentContext; } } if (aIsLink) { // If this node is a link, we want its visited's style context's // parent to be the regular style context of its parent, because // only the visitedness of the relevant link should influence style. parentIfVisited = aParentContext; } nsRefPtr result; if (aParentContext) result = aParentContext->FindChildWithRules(aPseudoTag, aRuleNode, aVisitedRuleNode, aIsVisitedLink); #ifdef NOISY_DEBUG if (result) fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount); else fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount); #endif if (!result) { result = NS_NewStyleContext(aParentContext, aPseudoTag, aPseudoType, aRuleNode); if (!result) return nullptr; if (aVisitedRuleNode) { nsRefPtr resultIfVisited = NS_NewStyleContext(parentIfVisited, aPseudoTag, aPseudoType, aVisitedRuleNode); if (!resultIfVisited) { return nullptr; } if (!parentIfVisited) { mRoots.AppendElement(resultIfVisited); } resultIfVisited->SetIsStyleIfVisited(); result->SetStyleIfVisited(resultIfVisited.forget()); bool relevantLinkVisited = aIsLink ? aIsVisitedLink : (aParentContext && aParentContext->RelevantLinkVisited()); if (relevantLinkVisited) { result->AddStyleBit(NS_STYLE_RELEVANT_LINK_VISITED); } } if (!aParentContext) mRoots.AppendElement(result); } else { NS_ASSERTION(result->GetPseudoType() == aPseudoType, "Unexpected type"); NS_ASSERTION(result->GetPseudo() == aPseudoTag, "Unexpected pseudo"); } if (aDoAnimations) { // Normally the animation manager has already added the correct // style rule. However, if the animation-name just changed, it // might have been wrong. So ask it to double-check based on the // resulting style context. nsIStyleRule *oldAnimRule = GetAnimationRule(aRuleNode); nsIStyleRule *animRule = PresContext()->AnimationManager()-> CheckAnimationRule(result, aElementForAnimation); NS_ABORT_IF_FALSE(result->GetRuleNode() == aRuleNode, "unexpected rule node"); NS_ABORT_IF_FALSE(!result->GetStyleIfVisited() == !aVisitedRuleNode, "unexpected visited rule node"); NS_ABORT_IF_FALSE(!aVisitedRuleNode || result->GetStyleIfVisited()->GetRuleNode() == aVisitedRuleNode, "unexpected visited rule node"); if (oldAnimRule != animRule) { nsRuleNode *ruleNode = ReplaceAnimationRule(aRuleNode, oldAnimRule, animRule); nsRuleNode *visitedRuleNode = aVisitedRuleNode ? ReplaceAnimationRule(aVisitedRuleNode, oldAnimRule, animRule) : nullptr; result = GetContext(aParentContext, ruleNode, visitedRuleNode, aIsLink, aIsVisitedLink, aPseudoTag, aPseudoType, false, nullptr); } } if (aElementForAnimation && aElementForAnimation->IsHTML(nsGkAtoms::body) && aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement && PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) { nsIDocument* doc = aElementForAnimation->GetCurrentDoc(); if (doc && doc->GetBodyElement() == aElementForAnimation) { // Update the prescontext's body color PresContext()->SetBodyTextColor(result->GetStyleColor()->mColor); } } return result.forget(); } void nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode, nsRuleWalker* aRuleWalker) { NS_ASSERTION(aCurrLevelNode && aCurrLevelNode != aLastPrevLevelNode, "How did we get here?"); nsAutoTArray importantRules; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { // We guarantee that we never walk the root node here, so no need // to null-check GetRule(). Furthermore, it must be a CSS rule. NS_ASSERTION(nsRefPtr(do_QueryObject(node->GetRule())), "Unexpected non-CSS rule"); nsIStyleRule* impRule = static_cast(node->GetRule())->GetImportantRule(); if (impRule) importantRules.AppendElement(impRule); } NS_ASSERTION(importantRules.Length() != 0, "Why did we think there were important rules?"); for (uint32_t i = importantRules.Length(); i-- != 0; ) { aRuleWalker->Forward(importantRules[i]); } } #ifdef DEBUG void nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { nsRefPtr rule(do_QueryObject(node->GetRule())); NS_ASSERTION(rule, "Unexpected non-CSS rule"); NS_ASSERTION(!rule->GetImportantRule(), "Unexpected important rule"); } } void nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode, nsRuleNode* aLastPrevLevelNode) { if (!aCurrLevelNode) return; for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode; node = node->GetParent()) { nsIStyleRule *rule = node->GetRule(); nsRefPtr cssRule(do_QueryObject(rule)); NS_ASSERTION(!cssRule || !cssRule->Selector(), "Unexpected CSS rule"); } } #endif // Enumerate the rules in a way that cares about the order of the rules. void nsStyleSet::FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc, void* aData, nsIContent* aContent, nsRuleWalker* aRuleWalker) { SAMPLE_LABEL("nsStyleSet", "FileRules"); // Cascading order: // [least important] // - UA normal rules = Agent normal // - User normal rules = User normal // - Presentation hints = PresHint normal // - Author normal rules = Document normal // - Override normal rules = Override normal // - animation rules = Animation normal // - Author !important rules = Document !important // - Override !important rules = Override !important // - User !important rules = User !important // - UA !important rules = Agent !important // - transition rules = Transition normal // [most important] // Save off the last rule before we start walking our agent sheets; // this will be either the root or one of the restriction rules. nsRuleNode* lastRestrictionRN = aRuleWalker->CurrentNode(); aRuleWalker->SetLevel(eAgentSheet, false, true); if (mRuleProcessors[eAgentSheet]) (*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData); nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode(); bool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules(); aRuleWalker->SetLevel(eUserSheet, false, true); bool skipUserStyles = aContent && aContent->IsInNativeAnonymousSubtree(); if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different (*aCollectorFunc)(mRuleProcessors[eUserSheet], aData); nsRuleNode* lastUserRN = aRuleWalker->CurrentNode(); bool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules(); aRuleWalker->SetLevel(ePresHintSheet, false, false); if (mRuleProcessors[ePresHintSheet]) (*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData); nsRuleNode* lastPresHintRN = aRuleWalker->CurrentNode(); aRuleWalker->SetLevel(eDocSheet, false, true); bool cutOffInheritance = false; if (mBindingManager && aContent) { // We can supply additional document-level sheets that should be walked. mBindingManager->WalkRules(aCollectorFunc, static_cast(aData), &cutOffInheritance); } if (!skipUserStyles && !cutOffInheritance && mRuleProcessors[eDocSheet]) // NOTE: different (*aCollectorFunc)(mRuleProcessors[eDocSheet], aData); aRuleWalker->SetLevel(eStyleAttrSheet, false, aRuleWalker->GetCheckForImportantRules()); if (mRuleProcessors[eStyleAttrSheet]) (*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData); nsRuleNode* lastDocRN = aRuleWalker->CurrentNode(); bool haveImportantDocRules = !aRuleWalker->GetCheckForImportantRules(); aRuleWalker->SetLevel(eOverrideSheet, false, true); if (mRuleProcessors[eOverrideSheet]) (*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData); nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode(); bool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules(); // This needs to match IsMoreSpecificThanAnimation() above. aRuleWalker->SetLevel(eAnimationSheet, false, false); (*aCollectorFunc)(mRuleProcessors[eAnimationSheet], aData); if (haveImportantDocRules) { aRuleWalker->SetLevel(eDocSheet, true, false); AddImportantRules(lastDocRN, lastPresHintRN, aRuleWalker); // doc } #ifdef DEBUG else { AssertNoImportantRules(lastDocRN, lastPresHintRN); } #endif if (haveImportantOverrideRules) { aRuleWalker->SetLevel(eOverrideSheet, true, false); AddImportantRules(lastOvrRN, lastDocRN, aRuleWalker); // override } #ifdef DEBUG else { AssertNoImportantRules(lastOvrRN, lastDocRN); } #endif #ifdef DEBUG AssertNoCSSRules(lastPresHintRN, lastUserRN); #endif if (haveImportantUserRules) { aRuleWalker->SetLevel(eUserSheet, true, false); AddImportantRules(lastUserRN, lastAgentRN, aRuleWalker); //user } #ifdef DEBUG else { AssertNoImportantRules(lastUserRN, lastAgentRN); } #endif if (haveImportantUARules) { aRuleWalker->SetLevel(eAgentSheet, true, false); AddImportantRules(lastAgentRN, lastRestrictionRN, aRuleWalker); //agent } #ifdef DEBUG else { AssertNoImportantRules(lastAgentRN, lastRestrictionRN); } #endif #ifdef DEBUG AssertNoCSSRules(lastRestrictionRN, mRuleTree); #endif #ifdef DEBUG nsRuleNode *lastImportantRN = aRuleWalker->CurrentNode(); #endif aRuleWalker->SetLevel(eTransitionSheet, false, false); (*aCollectorFunc)(mRuleProcessors[eTransitionSheet], aData); #ifdef DEBUG AssertNoCSSRules(aRuleWalker->CurrentNode(), lastImportantRN); #endif } // Enumerate all the rules in a way that doesn't care about the order // of the rules and doesn't walk !important-rules. void nsStyleSet::WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc, RuleProcessorData* aData, bool aWalkAllXBLStylesheets) { if (mRuleProcessors[eAgentSheet]) (*aFunc)(mRuleProcessors[eAgentSheet], aData); bool skipUserStyles = aData->mElement->IsInNativeAnonymousSubtree(); if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different (*aFunc)(mRuleProcessors[eUserSheet], aData); if (mRuleProcessors[ePresHintSheet]) (*aFunc)(mRuleProcessors[ePresHintSheet], aData); bool cutOffInheritance = false; if (mBindingManager) { // We can supply additional document-level sheets that should be walked. if (aWalkAllXBLStylesheets) { mBindingManager->WalkAllRules(aFunc, aData); } else { mBindingManager->WalkRules(aFunc, aData, &cutOffInheritance); } } if (!skipUserStyles && !cutOffInheritance && mRuleProcessors[eDocSheet]) // NOTE: different (*aFunc)(mRuleProcessors[eDocSheet], aData); if (mRuleProcessors[eStyleAttrSheet]) (*aFunc)(mRuleProcessors[eStyleAttrSheet], aData); if (mRuleProcessors[eOverrideSheet]) (*aFunc)(mRuleProcessors[eOverrideSheet], aData); (*aFunc)(mRuleProcessors[eAnimationSheet], aData); (*aFunc)(mRuleProcessors[eTransitionSheet], aData); } bool nsStyleSet::BuildDefaultStyleData(nsPresContext* aPresContext) { NS_ASSERTION(!mDefaultStyleData.mResetData && !mDefaultStyleData.mInheritedData, "leaking default style data"); mDefaultStyleData.mResetData = new (aPresContext) nsResetStyleData; if (!mDefaultStyleData.mResetData) return false; mDefaultStyleData.mInheritedData = new (aPresContext) nsInheritedStyleData; if (!mDefaultStyleData.mInheritedData) return false; #define SSARG_PRESCONTEXT aPresContext #define CREATE_DATA(name, type, args) \ if (!(mDefaultStyleData.m##type##Data->mStyleStructs[eStyleStruct_##name] = \ new (aPresContext) nsStyle##name args)) \ return false; #define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \ CREATE_DATA(name, Inherited, ctor_args) #define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \ CREATE_DATA(name, Reset, ctor_args) #include "nsStyleStructList.h" #undef STYLE_STRUCT_INHERITED #undef STYLE_STRUCT_RESET #undef SSARG_PRESCONTEXT return true; } already_AddRefed nsStyleSet::ResolveStyleFor(Element* aElement, nsStyleContext* aParentContext) { TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aElement->OwnerDoc()); return ResolveStyleFor(aElement, aParentContext, treeContext); } already_AddRefed nsStyleSet::ResolveStyleFor(Element* aElement, nsStyleContext* aParentContext, TreeMatchContext& aTreeMatchContext) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aElement, "aElement must not be null"); nsRuleWalker ruleWalker(mRuleTree); aTreeMatchContext.ResetForUnvisitedMatching(); ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker, aTreeMatchContext); FileRules(EnumRulesMatching, &data, aElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (aTreeMatchContext.HaveRelevantLink()) { aTreeMatchContext.ResetForVisitedMatching(); ruleWalker.Reset(); FileRules(EnumRulesMatching, &data, aElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } return GetContext(aParentContext, ruleNode, visitedRuleNode, nsCSSRuleProcessor::IsLink(aElement), nsCSSRuleProcessor::GetContentState(aElement, aTreeMatchContext). HasState(NS_EVENT_STATE_VISITED), nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement, true, aElement); } already_AddRefed nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext, const nsCOMArray &aRules) { NS_ENSURE_FALSE(mInShutdown, nullptr); nsRuleWalker ruleWalker(mRuleTree); // FIXME: Perhaps this should be passed in, but it probably doesn't // matter. ruleWalker.SetLevel(eDocSheet, false, false); for (int32_t i = 0; i < aRules.Count(); i++) { ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i)); } return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr, false, false, nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement, false, nullptr); } already_AddRefed nsStyleSet::ResolveStyleByAddingRules(nsStyleContext* aBaseContext, const nsCOMArray &aRules) { NS_ENSURE_FALSE(mInShutdown, nullptr); nsRuleWalker ruleWalker(mRuleTree); ruleWalker.SetCurrentNode(aBaseContext->GetRuleNode()); // FIXME: Perhaps this should be passed in, but it probably doesn't // matter. ruleWalker.SetLevel(eDocSheet, false, false); for (int32_t i = 0; i < aRules.Count(); i++) { ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i)); } nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (aBaseContext->GetStyleIfVisited()) { ruleWalker.SetCurrentNode(aBaseContext->GetStyleIfVisited()->GetRuleNode()); for (int32_t i = 0; i < aRules.Count(); i++) { ruleWalker.ForwardOnPossiblyCSSRule(aRules.ObjectAt(i)); } visitedRuleNode = ruleWalker.CurrentNode(); } return GetContext(aBaseContext->GetParent(), ruleNode, visitedRuleNode, aBaseContext->IsLinkContext(), aBaseContext->RelevantLinkVisited(), aBaseContext->GetPseudo(), aBaseContext->GetPseudoType(), false, nullptr); } already_AddRefed nsStyleSet::ResolveStyleForNonElement(nsStyleContext* aParentContext) { return GetContext(aParentContext, mRuleTree, nullptr, false, false, nsCSSAnonBoxes::mozNonElement, nsCSSPseudoElements::ePseudo_AnonBox, false, nullptr); } void nsStyleSet::WalkRestrictionRule(nsCSSPseudoElements::Type aPseudoType, nsRuleWalker* aRuleWalker) { // This needs to match GetPseudoRestriction in nsRuleNode.cpp. aRuleWalker->SetLevel(eAgentSheet, false, false); if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLetter) aRuleWalker->Forward(mFirstLetterRule); else if (aPseudoType == nsCSSPseudoElements::ePseudo_firstLine) aRuleWalker->Forward(mFirstLineRule); } already_AddRefed nsStyleSet::ResolvePseudoElementStyle(Element* aParentElement, nsCSSPseudoElements::Type aType, nsStyleContext* aParentContext) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount, "must have pseudo element type"); NS_ASSERTION(aParentElement, "Must have parent element"); nsRuleWalker ruleWalker(mRuleTree); TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aParentElement->OwnerDoc()); PseudoElementRuleProcessorData data(PresContext(), aParentElement, &ruleWalker, aType, treeContext); WalkRestrictionRule(aType, &ruleWalker); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (treeContext.HaveRelevantLink()) { treeContext.ResetForVisitedMatching(); ruleWalker.Reset(); WalkRestrictionRule(aType, &ruleWalker); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } return GetContext(aParentContext, ruleNode, visitedRuleNode, // For pseudos, |data.IsLink()| being true means that // our parent node is a link. false, false, nsCSSPseudoElements::GetPseudoAtom(aType), aType, aType == nsCSSPseudoElements::ePseudo_before || aType == nsCSSPseudoElements::ePseudo_after, aParentElement); } already_AddRefed nsStyleSet::ProbePseudoElementStyle(Element* aParentElement, nsCSSPseudoElements::Type aType, nsStyleContext* aParentContext) { TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aParentElement->OwnerDoc()); return ProbePseudoElementStyle(aParentElement, aType, aParentContext, treeContext); } already_AddRefed nsStyleSet::ProbePseudoElementStyle(Element* aParentElement, nsCSSPseudoElements::Type aType, nsStyleContext* aParentContext, TreeMatchContext& aTreeMatchContext) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount, "must have pseudo element type"); NS_ASSERTION(aParentElement, "aParentElement must not be null"); nsIAtom* pseudoTag = nsCSSPseudoElements::GetPseudoAtom(aType); nsRuleWalker ruleWalker(mRuleTree); aTreeMatchContext.ResetForUnvisitedMatching(); PseudoElementRuleProcessorData data(PresContext(), aParentElement, &ruleWalker, aType, aTreeMatchContext); WalkRestrictionRule(aType, &ruleWalker); // not the root if there was a restriction rule nsRuleNode *adjustedRoot = ruleWalker.CurrentNode(); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); if (ruleNode == adjustedRoot) { return nullptr; } nsRuleNode *visitedRuleNode = nullptr; if (aTreeMatchContext.HaveRelevantLink()) { aTreeMatchContext.ResetForVisitedMatching(); ruleWalker.Reset(); WalkRestrictionRule(aType, &ruleWalker); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } nsRefPtr result = GetContext(aParentContext, ruleNode, visitedRuleNode, // For pseudos, |data.IsLink()| being true means that // our parent node is a link. false, false, pseudoTag, aType, aType == nsCSSPseudoElements::ePseudo_before || aType == nsCSSPseudoElements::ePseudo_after, aParentElement); // For :before and :after pseudo-elements, having display: none or no // 'content' property is equivalent to not having the pseudo-element // at all. if (result && (pseudoTag == nsCSSPseudoElements::before || pseudoTag == nsCSSPseudoElements::after)) { const nsStyleDisplay *display = result->GetStyleDisplay(); const nsStyleContent *content = result->GetStyleContent(); // XXXldb What is contentCount for |content: ""|? if (display->mDisplay == NS_STYLE_DISPLAY_NONE || content->ContentCount() == 0) { result = nullptr; } } return result.forget(); } already_AddRefed nsStyleSet::ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag, nsStyleContext* aParentContext) { NS_ENSURE_FALSE(mInShutdown, nullptr); #ifdef DEBUG bool isAnonBox = nsCSSAnonBoxes::IsAnonBox(aPseudoTag) #ifdef MOZ_XUL && !nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag) #endif ; NS_PRECONDITION(isAnonBox, "Unexpected pseudo"); #endif nsRuleWalker ruleWalker(mRuleTree); AnonBoxRuleProcessorData data(PresContext(), aPseudoTag, &ruleWalker); FileRules(EnumRulesMatching, &data, nullptr, &ruleWalker); return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr, false, false, aPseudoTag, nsCSSPseudoElements::ePseudo_AnonBox, false, nullptr); } #ifdef MOZ_XUL already_AddRefed nsStyleSet::ResolveXULTreePseudoStyle(Element* aParentElement, nsIAtom* aPseudoTag, nsStyleContext* aParentContext, nsICSSPseudoComparator* aComparator) { NS_ENSURE_FALSE(mInShutdown, nullptr); NS_ASSERTION(aPseudoTag, "must have pseudo tag"); NS_ASSERTION(nsCSSAnonBoxes::IsTreePseudoElement(aPseudoTag), "Unexpected pseudo"); nsRuleWalker ruleWalker(mRuleTree); TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited, aParentElement->OwnerDoc()); XULTreeRuleProcessorData data(PresContext(), aParentElement, &ruleWalker, aPseudoTag, aComparator, treeContext); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); nsRuleNode *ruleNode = ruleWalker.CurrentNode(); nsRuleNode *visitedRuleNode = nullptr; if (treeContext.HaveRelevantLink()) { treeContext.ResetForVisitedMatching(); ruleWalker.Reset(); FileRules(EnumRulesMatching, &data, aParentElement, &ruleWalker); visitedRuleNode = ruleWalker.CurrentNode(); } return GetContext(aParentContext, ruleNode, visitedRuleNode, // For pseudos, |data.IsLink()| being true means that // our parent node is a link. false, false, aPseudoTag, nsCSSPseudoElements::ePseudo_XULTree, false, nullptr); } #endif bool nsStyleSet::AppendFontFaceRules(nsPresContext* aPresContext, nsTArray& aArray) { NS_ENSURE_FALSE(mInShutdown, false); for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) { nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (ruleProc && !ruleProc->AppendFontFaceRules(aPresContext, aArray)) return false; } return true; } bool nsStyleSet::AppendKeyframesRules(nsPresContext* aPresContext, nsTArray& aArray) { NS_ENSURE_FALSE(mInShutdown, false); for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) { nsCSSRuleProcessor *ruleProc = static_cast (mRuleProcessors[gCSSSheetTypes[i]].get()); if (ruleProc && !ruleProc->AppendKeyframesRules(aPresContext, aArray)) return false; } return true; } void nsStyleSet::BeginShutdown(nsPresContext* aPresContext) { mInShutdown = 1; mRoots.Clear(); // no longer valid, since we won't keep it up to date } void nsStyleSet::Shutdown(nsPresContext* aPresContext) { mRuleTree->Destroy(); mRuleTree = nullptr; // We can have old rule trees either because: // (1) we failed the assertions in EndReconstruct, or // (2) we're shutting down within a reconstruct (see bug 462392) for (uint32_t i = mOldRuleTrees.Length(); i > 0; ) { --i; mOldRuleTrees[i]->Destroy(); } mOldRuleTrees.Clear(); mDefaultStyleData.Destroy(0, aPresContext); } static const uint32_t kGCInterval = 300; void nsStyleSet::NotifyStyleContextDestroyed(nsPresContext* aPresContext, nsStyleContext* aStyleContext) { if (mInShutdown) return; // Remove style contexts from mRoots even if mOldRuleTree is non-null. This // could be a style context from the new ruletree! if (!aStyleContext->GetParent()) { mRoots.RemoveElement(aStyleContext); } if (mInReconstruct) return; if (mUnusedRuleNodeCount >= kGCInterval) { GCRuleTrees(); } } void nsStyleSet::GCRuleTrees() { mUnusedRuleNodeCount = 0; // Mark the style context tree by marking all style contexts which // have no parent, which will mark all descendants. This will reach // style contexts in the undisplayed map and "additional style // contexts" since they are descendants of the roots. for (int32_t i = mRoots.Length() - 1; i >= 0; --i) { mRoots[i]->Mark(); } // Sweep the rule tree. #ifdef DEBUG bool deleted = #endif mRuleTree->Sweep(); NS_ASSERTION(!deleted, "Root node must not be gc'd"); // Sweep the old rule trees. for (uint32_t i = mOldRuleTrees.Length(); i > 0; ) { --i; if (mOldRuleTrees[i]->Sweep()) { // It was deleted, as it should be. mOldRuleTrees.RemoveElementAt(i); } else { NS_NOTREACHED("old rule tree still referenced"); } } } static inline nsRuleNode* SkipAnimationRules(nsRuleNode* aRuleNode, Element* aElement, bool isPseudo) { nsRuleNode* ruleNode = aRuleNode; while (!ruleNode->IsRoot() && (ruleNode->GetLevel() == nsStyleSet::eTransitionSheet || ruleNode->GetLevel() == nsStyleSet::eAnimationSheet)) { ruleNode = ruleNode->GetParent(); } if (ruleNode != aRuleNode) { NS_ASSERTION(aElement, "How can we have transition rules but no element?"); // Need to do an animation restyle, just like // nsTransitionManager::WalkTransitionRule and // nsAnimationManager::GetAnimationRule would. nsRestyleHint hint = isPseudo ? eRestyle_Subtree : eRestyle_Self; aRuleNode->GetPresContext()->PresShell()->RestyleForAnimation(aElement, hint); } return ruleNode; } already_AddRefed nsStyleSet::ReparentStyleContext(nsStyleContext* aStyleContext, nsStyleContext* aNewParentContext, Element* aElement) { if (!aStyleContext) { NS_NOTREACHED("must have style context"); return nullptr; } // This short-circuit is OK because we don't call TryStartingTransition // during style reresolution if the style context pointer hasn't changed. if (aStyleContext->GetParent() == aNewParentContext) { aStyleContext->AddRef(); return aStyleContext; } nsIAtom* pseudoTag = aStyleContext->GetPseudo(); nsCSSPseudoElements::Type pseudoType = aStyleContext->GetPseudoType(); nsRuleNode* ruleNode = aStyleContext->GetRuleNode(); // Skip transition rules as needed just like // nsTransitionManager::WalkTransitionRule would. bool skipAnimationRules = PresContext()->IsProcessingRestyles() && !PresContext()->IsProcessingAnimationStyleChange(); if (skipAnimationRules) { // Make sure that we're not using transition rules or animation rules for // our new style context. If we need them, an animation restyle will // provide. ruleNode = SkipAnimationRules(ruleNode, aElement, pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement); } nsRuleNode* visitedRuleNode = nullptr; nsStyleContext* visitedContext = aStyleContext->GetStyleIfVisited(); // Reparenting a style context just changes where we inherit from, // not what rules we match or what our DOM looks like. In // particular, it doesn't change whether this is a style context for // a link. if (visitedContext) { visitedRuleNode = visitedContext->GetRuleNode(); // Again, skip transition rules as needed if (skipAnimationRules) { // FIXME do something here for animations? visitedRuleNode = SkipAnimationRules(visitedRuleNode, aElement, pseudoType != nsCSSPseudoElements::ePseudo_NotPseudoElement); } } // If we're a style context for a link, then we already know whether // our relevant link is visited, since that does not depend on our // parent. Otherwise, we need to match aNewParentContext. bool relevantLinkVisited = aStyleContext->IsLinkContext() ? aStyleContext->RelevantLinkVisited() : aNewParentContext->RelevantLinkVisited(); return GetContext(aNewParentContext, ruleNode, visitedRuleNode, aStyleContext->IsLinkContext(), relevantLinkVisited, pseudoTag, pseudoType, pseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement || pseudoType == nsCSSPseudoElements::ePseudo_before || pseudoType == nsCSSPseudoElements::ePseudo_after, aElement); } struct StatefulData : public StateRuleProcessorData { StatefulData(nsPresContext* aPresContext, Element* aElement, nsEventStates aStateMask, TreeMatchContext& aTreeMatchContext) : StateRuleProcessorData(aPresContext, aElement, aStateMask, aTreeMatchContext), mHint(nsRestyleHint(0)) {} nsRestyleHint mHint; }; static bool SheetHasDocumentStateStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { StatefulData* data = (StatefulData*)aData; if (aProcessor->HasDocumentStateDependentStyle(data)) { data->mHint = eRestyle_Self; return false; // don't continue } return true; // continue } // Test if style is dependent on a document state. bool nsStyleSet::HasDocumentStateDependentStyle(nsPresContext* aPresContext, nsIContent* aContent, nsEventStates aStateMask) { if (!aContent || !aContent->IsElement()) return false; TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aContent->OwnerDoc()); StatefulData data(aPresContext, aContent->AsElement(), aStateMask, treeContext); WalkRuleProcessors(SheetHasDocumentStateStyle, &data, true); return data.mHint != 0; } static bool SheetHasStatefulStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { StatefulData* data = (StatefulData*)aData; nsRestyleHint hint = aProcessor->HasStateDependentStyle(data); data->mHint = nsRestyleHint(data->mHint | hint); return true; // continue } // Test if style is dependent on content state nsRestyleHint nsStyleSet::HasStateDependentStyle(nsPresContext* aPresContext, Element* aElement, nsEventStates aStateMask) { TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aElement->OwnerDoc()); StatefulData data(aPresContext, aElement, aStateMask, treeContext); WalkRuleProcessors(SheetHasStatefulStyle, &data, false); return data.mHint; } struct AttributeData : public AttributeRuleProcessorData { AttributeData(nsPresContext* aPresContext, Element* aElement, nsIAtom* aAttribute, int32_t aModType, bool aAttrHasChanged, TreeMatchContext& aTreeMatchContext) : AttributeRuleProcessorData(aPresContext, aElement, aAttribute, aModType, aAttrHasChanged, aTreeMatchContext), mHint(nsRestyleHint(0)) {} nsRestyleHint mHint; }; static bool SheetHasAttributeStyle(nsIStyleRuleProcessor* aProcessor, void *aData) { AttributeData* data = (AttributeData*)aData; nsRestyleHint hint = aProcessor->HasAttributeDependentStyle(data); data->mHint = nsRestyleHint(data->mHint | hint); return true; // continue } // Test if style is dependent on content state nsRestyleHint nsStyleSet::HasAttributeDependentStyle(nsPresContext* aPresContext, Element* aElement, nsIAtom* aAttribute, int32_t aModType, bool aAttrHasChanged) { TreeMatchContext treeContext(false, nsRuleWalker::eLinksVisitedOrUnvisited, aElement->OwnerDoc()); AttributeData data(aPresContext, aElement, aAttribute, aModType, aAttrHasChanged, treeContext); WalkRuleProcessors(SheetHasAttributeStyle, &data, false); return data.mHint; } bool nsStyleSet::MediumFeaturesChanged(nsPresContext* aPresContext) { // We can't use WalkRuleProcessors without a content node. bool stylesChanged = false; for (uint32_t i = 0; i < ArrayLength(mRuleProcessors); ++i) { nsIStyleRuleProcessor *processor = mRuleProcessors[i]; if (!processor) { continue; } bool thisChanged = processor->MediumFeaturesChanged(aPresContext); stylesChanged = stylesChanged || thisChanged; } if (mBindingManager) { bool thisChanged = false; mBindingManager->MediumFeaturesChanged(aPresContext, &thisChanged); stylesChanged = stylesChanged || thisChanged; } return stylesChanged; } nsCSSStyleSheet::EnsureUniqueInnerResult nsStyleSet::EnsureUniqueInnerOnCSSSheets() { nsAutoTArray queue; for (uint32_t i = 0; i < ArrayLength(gCSSSheetTypes); ++i) { nsCOMArray &sheets = mSheets[gCSSSheetTypes[i]]; for (uint32_t j = 0, j_end = sheets.Count(); j < j_end; ++j) { nsCSSStyleSheet *sheet = static_cast(sheets[j]); if (!queue.AppendElement(sheet)) { return nsCSSStyleSheet::eUniqueInner_CloneFailed; } } } if (mBindingManager) { mBindingManager->AppendAllSheets(queue); } nsCSSStyleSheet::EnsureUniqueInnerResult res = nsCSSStyleSheet::eUniqueInner_AlreadyUnique; while (!queue.IsEmpty()) { uint32_t idx = queue.Length() - 1; nsCSSStyleSheet *sheet = queue[idx]; queue.RemoveElementAt(idx); nsCSSStyleSheet::EnsureUniqueInnerResult sheetRes = sheet->EnsureUniqueInner(); if (sheetRes == nsCSSStyleSheet::eUniqueInner_CloneFailed) { return sheetRes; } if (sheetRes == nsCSSStyleSheet::eUniqueInner_ClonedInner) { res = sheetRes; } // Enqueue all the sheet's children. if (!sheet->AppendAllChildSheets(queue)) { return nsCSSStyleSheet::eUniqueInner_CloneFailed; } } return res; } nsIStyleRule* nsStyleSet::InitialStyleRule() { if (!mInitialStyleRule) { mInitialStyleRule = new nsInitialStyleRule; } return mInitialStyleRule; }