The Tor Browser: layout/style/nsStyleSet.h@7e26c7da4463 (annotated)

layout/style/nsStyleSet.h@7e26c7da4463 (annotated)

layout/style/nsStyleSet.h

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- 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
  */
 #ifndef nsStyleSet_h_
 #define nsStyleSet_h_
 #include "mozilla/Attributes.h"
 #include "mozilla/MemoryReporting.h"
 #include "nsIStyleRuleProcessor.h"
 #include "nsCSSStyleSheet.h"
 #include "nsBindingManager.h"
 #include "nsRuleNode.h"
 #include "nsTArray.h"
 #include "nsCOMArray.h"
 #include "nsAutoPtr.h"
 #include "nsIStyleRule.h"
 #include "nsCSSPseudoElements.h"
 #include "gfxFontFeatures.h"
 class nsCSSFontFaceRule;
 class nsCSSKeyframesRule;
 class nsCSSFontFeatureValuesRule;
 class nsCSSPageRule;
 class nsRuleWalker;
 struct ElementDependentRuleProcessorData;
 struct TreeMatchContext;
 namespace mozilla {
 class EventStates;
 } // namespace mozilla
 class nsEmptyStyleRule MOZ_FINAL : public nsIStyleRule
 {
   NS_DECL_ISUPPORTS
   virtual void MapRuleInfoInto(nsRuleData* aRuleData) MOZ_OVERRIDE;
 #ifdef DEBUG
   virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
 #endif
 };
 class nsInitialStyleRule MOZ_FINAL : public nsIStyleRule
 {
   NS_DECL_ISUPPORTS
   virtual void MapRuleInfoInto(nsRuleData* aRuleData) MOZ_OVERRIDE;
 #ifdef DEBUG
   virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
 #endif
 };
 class nsDisableTextZoomStyleRule MOZ_FINAL : public nsIStyleRule
 {
   NS_DECL_ISUPPORTS
   virtual void MapRuleInfoInto(nsRuleData* aRuleData) MOZ_OVERRIDE;
 #ifdef DEBUG
   virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
 #endif
 };
 // The style set object is created by the document viewer and ownership is
 // then handed off to the PresShell.  Only the PresShell should delete a
 // style set.
 class nsStyleSet
 {
  public:
   nsStyleSet();
   size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
   void Init(nsPresContext *aPresContext);
   nsRuleNode* GetRuleTree() { return mRuleTree; }
   // enable / disable the Quirk style sheet
   void EnableQuirkStyleSheet(bool aEnable);
   // get a style context for a non-pseudo frame.
   already_AddRefed<nsStyleContext>
   ResolveStyleFor(mozilla::dom::Element* aElement,
                   nsStyleContext* aParentContext);
   already_AddRefed<nsStyleContext>
   ResolveStyleFor(mozilla::dom::Element* aElement,
                   nsStyleContext* aParentContext,
                   TreeMatchContext& aTreeMatchContext);
   // Get a style context (with the given parent) for the
   // sequence of style rules in the |aRules| array.
   already_AddRefed<nsStyleContext>
   ResolveStyleForRules(nsStyleContext* aParentContext,
                        const nsTArray< nsCOMPtr<nsIStyleRule> > &aRules);
   // used in ResolveStyleForRules below
   struct RuleAndLevel
   {
     nsIStyleRule* mRule;
     uint8_t mLevel;
   };
   // Get a new style context for aElement for the rules in aRules
   // aRules is an array of rules and their levels in reverse order,
   // that is from the leaf-most to the root-most rule in the rule tree.
   already_AddRefed<nsStyleContext>
   ResolveStyleForRules(nsStyleContext* aParentContext,
                        nsStyleContext* aOldStyle,
                        const nsTArray<RuleAndLevel>& aRules);
   // Get a style context that represents aBaseContext, but as though
   // it additionally matched the rules in the aRules array (in that
   // order, as more specific than any other rules).
   already_AddRefed<nsStyleContext>
   ResolveStyleByAddingRules(nsStyleContext* aBaseContext,
                             const nsCOMArray<nsIStyleRule> &aRules);
   // Get a style context for a non-element (which no rules will match),
   // such as text nodes, placeholder frames, and the nsFirstLetterFrame
   // for everything after the first letter.
   //
   // Perhaps this should go away and we shouldn't even create style
   // contexts for such content nodes.  However, not doing any rule
   // matching for them is a first step.
   already_AddRefed<nsStyleContext>
   ResolveStyleForNonElement(nsStyleContext* aParentContext);
   // Get a style context for a pseudo-element.  aParentElement must be
   // non-null.  aPseudoID is the nsCSSPseudoElements::Type for the
   // pseudo-element.  aPseudoElement must be non-null if the pseudo-element
   // type is one that allows user action pseudo-classes after it; otherwise,
   // it is ignored.
   already_AddRefed<nsStyleContext>
   ResolvePseudoElementStyle(mozilla::dom::Element* aParentElement,
                             nsCSSPseudoElements::Type aType,
                             nsStyleContext* aParentContext,
                             mozilla::dom::Element* aPseudoElement);
   // This functions just like ResolvePseudoElementStyle except that it will
   // return nullptr if there are no explicit style rules for that
   // pseudo element.
   already_AddRefed<nsStyleContext>
   ProbePseudoElementStyle(mozilla::dom::Element* aParentElement,
                           nsCSSPseudoElements::Type aType,
                           nsStyleContext* aParentContext);
   already_AddRefed<nsStyleContext>
   ProbePseudoElementStyle(mozilla::dom::Element* aParentElement,
                           nsCSSPseudoElements::Type aType,
                           nsStyleContext* aParentContext,
                           TreeMatchContext& aTreeMatchContext,
                           mozilla::dom::Element* aPseudoElement = nullptr);
   // Get a style context for an anonymous box.  aPseudoTag is the
   // pseudo-tag to use and must be non-null.
   already_AddRefed<nsStyleContext>
   ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag, nsStyleContext* aParentContext);
 #ifdef MOZ_XUL
   // Get a style context for a XUL tree pseudo.  aPseudoTag is the
   // pseudo-tag to use and must be non-null.  aParentContent must be
   // non-null.  aComparator must be non-null.
   already_AddRefed<nsStyleContext>
   ResolveXULTreePseudoStyle(mozilla::dom::Element* aParentElement,
                             nsIAtom* aPseudoTag,
                             nsStyleContext* aParentContext,
                             nsICSSPseudoComparator* aComparator);
 #endif
   // Append all the currently-active font face rules to aArray.  Return
   // true for success and false for failure.
   bool AppendFontFaceRules(nsPresContext* aPresContext,
                              nsTArray<nsFontFaceRuleContainer>& aArray);
   // Return the winning (in the cascade) @keyframes rule for the given name.
   nsCSSKeyframesRule* KeyframesRuleForName(nsPresContext* aPresContext,
                                            const nsString& aName);
   // Fetch object for looking up font feature values
   already_AddRefed<gfxFontFeatureValueSet> GetFontFeatureValuesLookup();
   // Append all the currently-active font feature values rules to aArray.
   // Return true for success and false for failure.
   bool AppendFontFeatureValuesRules(nsPresContext* aPresContext,
                               nsTArray<nsCSSFontFeatureValuesRule*>& aArray);
   // Append all the currently-active page rules to aArray.  Return
   // true for success and false for failure.
   bool AppendPageRules(nsPresContext* aPresContext,
                        nsTArray<nsCSSPageRule*>& aArray);
   // Begin ignoring style context destruction, to avoid lots of unnecessary
   // work on document teardown.
   void BeginShutdown(nsPresContext* aPresContext);
   // Free all of the data associated with this style set.
   void Shutdown(nsPresContext* aPresContext);
   // Notification that a style context is being destroyed.
   void NotifyStyleContextDestroyed(nsPresContext* aPresContext,
                                    nsStyleContext* aStyleContext);
   // Get a new style context that lives in a different parent
   // The new context will be the same as the old if the new parent is the
   // same as the old parent.
   // aElement should be non-null if this is a style context for an
   // element or pseudo-element; in the latter case it should be the
   // real element the pseudo-element is for.
   already_AddRefed<nsStyleContext>
   ReparentStyleContext(nsStyleContext* aStyleContext,
                        nsStyleContext* aNewParentContext,
                        mozilla::dom::Element* aElement);
   // Test if style is dependent on a document state.
   bool HasDocumentStateDependentStyle(nsPresContext* aPresContext,
                                       nsIContent*    aContent,
                                       mozilla::EventStates aStateMask);
   // Test if style is dependent on content state
   nsRestyleHint HasStateDependentStyle(nsPresContext* aPresContext,
                                        mozilla::dom::Element* aElement,
                                        mozilla::EventStates aStateMask);
   nsRestyleHint HasStateDependentStyle(nsPresContext* aPresContext,
                                        mozilla::dom::Element* aElement,
                                        nsCSSPseudoElements::Type aPseudoType,
                                        mozilla::dom::Element* aPseudoElement,
                                        mozilla::EventStates aStateMask);
   // Test if style is dependent on the presence of an attribute.
   nsRestyleHint HasAttributeDependentStyle(nsPresContext* aPresContext,
                                            mozilla::dom::Element* aElement,
                                            nsIAtom*       aAttribute,
                                            int32_t        aModType,
                                            bool           aAttrHasChanged);
   /*
    * Do any processing that needs to happen as a result of a change in
    * the characteristics of the medium, and return whether style rules
    * may have changed as a result.
    */
   bool MediumFeaturesChanged(nsPresContext* aPresContext);
   // APIs for registering objects that can supply additional
   // rules during processing.
   void SetBindingManager(nsBindingManager* aBindingManager)
   {
     mBindingManager = aBindingManager;
   }
   // The "origins" of the CSS cascade, from lowest precedence to
   // highest (for non-!important rules).
   enum sheetType {
     eAgentSheet, // CSS
     eUserSheet, // CSS
     ePresHintSheet,
     eDocSheet, // CSS
     eScopedDocSheet,
     eStyleAttrSheet,
     eOverrideSheet, // CSS
     eAnimationSheet,
     eTransitionSheet,
     eSheetTypeCount
     // be sure to keep the number of bits in |mDirty| below and in
     // NS_RULE_NODE_LEVEL_MASK updated when changing the number of sheet
     // types
   };
   // APIs to manipulate the style sheet lists.  The sheets in each
   // list are stored with the most significant sheet last.
   nsresult AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
   nsresult PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
   nsresult RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
   nsresult ReplaceSheets(sheetType aType,
                          const nsCOMArray<nsIStyleSheet> &aNewSheets);
   nsresult InsertStyleSheetBefore(sheetType aType, nsIStyleSheet *aNewSheet,
                                   nsIStyleSheet *aReferenceSheet);
   nsresult DirtyRuleProcessors(sheetType aType);
   // Enable/Disable entire author style level (Doc, ScopedDoc & PresHint levels)
   bool GetAuthorStyleDisabled();
   nsresult SetAuthorStyleDisabled(bool aStyleDisabled);
   int32_t SheetCount(sheetType aType) const {
     return mSheets[aType].Count();
   }
   nsIStyleSheet* StyleSheetAt(sheetType aType, int32_t aIndex) const {
     return mSheets[aType].ObjectAt(aIndex);
   }
   nsresult RemoveDocStyleSheet(nsIStyleSheet* aSheet);
   nsresult AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument);
   void     BeginUpdate();
   nsresult EndUpdate();
   // Methods for reconstructing the tree; BeginReconstruct basically moves the
   // old rule tree root and style context roots out of the way,
   // and EndReconstruct destroys the old rule tree when we're done
   nsresult BeginReconstruct();
   // Note: EndReconstruct should not be called if BeginReconstruct fails
   void EndReconstruct();
   // Let the style set know that a particular sheet is the quirks sheet.  This
   // sheet must already have been added to the UA sheets.  The pointer must not
   // be null.  This should only be called once for a given style set.
   void SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet);
   // Return whether the rule tree has cached data such that we need to
   // do dynamic change handling for changes that change the results of
   // media queries or require rebuilding all style data.
   // We don't care whether we have cached rule processors or whether
   // they have cached rule cascades; getting the rule cascades again in
   // order to do rule matching will get the correct rule cascade.
   bool HasCachedStyleData() const {
     return (mRuleTree && mRuleTree->TreeHasCachedData()) || !mRoots.IsEmpty();
   }
   // Notify the style set that a rulenode is no longer in use, or was
   // just created and is not in use yet.
   void RuleNodeUnused() {
     ++mUnusedRuleNodeCount;
   }
   // Notify the style set that a rulenode that wasn't in use now is
   void RuleNodeInUse() {
     --mUnusedRuleNodeCount;
   }
   nsCSSStyleSheet::EnsureUniqueInnerResult EnsureUniqueInnerOnCSSSheets();
   nsIStyleRule* InitialStyleRule();
  private:
   nsStyleSet(const nsStyleSet& aCopy) MOZ_DELETE;
   nsStyleSet& operator=(const nsStyleSet& aCopy) MOZ_DELETE;
   // Run mark-and-sweep GC on mRuleTree and mOldRuleTrees, based on mRoots.
   void GCRuleTrees();
   // Update the rule processor list after a change to the style sheet list.
   nsresult GatherRuleProcessors(sheetType aType);
   void AddImportantRules(nsRuleNode* aCurrLevelNode,
                          nsRuleNode* aLastPrevLevelNode,
                          nsRuleWalker* aRuleWalker);
   // Move aRuleWalker forward by the appropriate rule if we need to add
   // a rule due to property restrictions on pseudo-elements.
   void WalkRestrictionRule(nsCSSPseudoElements::Type aPseudoType,
                            nsRuleWalker* aRuleWalker);
   void WalkDisableTextZoomRule(mozilla::dom::Element* aElement,
                                nsRuleWalker* aRuleWalker);
 #ifdef DEBUG
   // Just like AddImportantRules except it doesn't actually add anything; it
   // just asserts that there are no important rules between aCurrLevelNode and
   // aLastPrevLevelNode.
   void AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
                               nsRuleNode* aLastPrevLevelNode);
   // Just like AddImportantRules except it doesn't actually add anything; it
   // just asserts that there are no CSS rules between aCurrLevelNode and
   // aLastPrevLevelNode.  Mostly useful for the preshint level.
   void AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
                         nsRuleNode* aLastPrevLevelNode);
 #endif
   // Enumerate the rules in a way that cares about the order of the
   // rules.
   // aElement is the element the rules are for.  It might be null.  aData
   // is the closure to pass to aCollectorFunc.  If aContent is not null,
   // aData must be a RuleProcessorData*
   void FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc,
                  RuleProcessorData* aData, mozilla::dom::Element* aElement,
                  nsRuleWalker* aRuleWalker);
   // Enumerate all the rules in a way that doesn't care about the order
   // of the rules and break out if the enumeration is halted.
   void WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc,
                           ElementDependentRuleProcessorData* aData,
                           bool aWalkAllXBLStylesheets);
   /**
    * Bit-flags that can be passed to GetContext() in its parameter 'aFlags'.
    */
   enum {
     eNoFlags =          0,
     eIsLink =           1 << 0,
     eIsVisitedLink =    1 << 1,
     eDoAnimation =      1 << 2,
     // Indicates that we should skip the flex-item-specific chunk of
     // ApplyStyleFixups().  This is useful if our parent has "display: flex"
     // but we can tell it's not going to actually be a flex container (e.g. if
     // it's the outer frame of a button widget, and we're the inline frame for
     // the button's label).
     eSkipFlexItemStyleFixup = 1 << 3
   };
   already_AddRefed<nsStyleContext>
   GetContext(nsStyleContext* aParentContext,
              nsRuleNode* aRuleNode,
              nsRuleNode* aVisitedRuleNode,
              nsIAtom* aPseudoTag,
              nsCSSPseudoElements::Type aPseudoType,
              mozilla::dom::Element* aElementForAnimation,
              uint32_t aFlags);
   nsPresContext* PresContext() { return mRuleTree->PresContext(); }
   // The sheets in each array in mSheets are stored with the most significant
   // sheet last.
   // The arrays for ePresHintSheet, eStyleAttrSheet, eTransitionSheet,
   // and eAnimationSheet are always empty.  (FIXME:  We should reduce
   // the storage needed for them.)
   nsCOMArray<nsIStyleSheet> mSheets[eSheetTypeCount];
   // mRuleProcessors[eScopedDocSheet] is always null; rule processors
   // for scoped style sheets are stored in mScopedDocSheetRuleProcessors.
   nsCOMPtr<nsIStyleRuleProcessor> mRuleProcessors[eSheetTypeCount];
   // Rule processors for HTML5 scoped style sheets, one per scope.
   nsTArray<nsCOMPtr<nsIStyleRuleProcessor> > mScopedDocSheetRuleProcessors;
   // cached instance for enabling/disabling
   nsCOMPtr<nsIStyleSheet> mQuirkStyleSheet;
   nsRefPtr<nsBindingManager> mBindingManager;
   nsRuleNode* mRuleTree; // This is the root of our rule tree.  It is a
                          // lexicographic tree of matched rules that style
                          // contexts use to look up properties.
   uint16_t mBatching;
   unsigned mInShutdown : 1;
   unsigned mAuthorStyleDisabled: 1;
   unsigned mInReconstruct : 1;
   unsigned mInitFontFeatureValuesLookup : 1;
   unsigned mDirty : 9;  // one dirty bit is used per sheet type
   uint32_t mUnusedRuleNodeCount; // used to batch rule node GC
   nsTArray<nsStyleContext*> mRoots; // style contexts with no parent
   // Empty style rules to force things that restrict which properties
   // apply into different branches of the rule tree.
   nsRefPtr<nsEmptyStyleRule> mFirstLineRule, mFirstLetterRule, mPlaceholderRule;
   // Style rule which sets all properties to their initial values for
   // determining when context-sensitive values are in use.
   nsRefPtr<nsInitialStyleRule> mInitialStyleRule;
   // Style rule that sets the internal -x-text-zoom property on
   // <svg:text> elements to disable the effect of text zooming.
   nsRefPtr<nsDisableTextZoomStyleRule> mDisableTextZoomStyleRule;
   // Old rule trees, which should only be non-empty between
   // BeginReconstruct and EndReconstruct, but in case of bugs that cause
   // style contexts to exist too long, may last longer.
   nsTArray<nsRuleNode*> mOldRuleTrees;
   // whether font feature values lookup object needs initialization
   nsRefPtr<gfxFontFeatureValueSet> mFontFeatureValuesLookup;
 };
 #ifdef MOZILLA_INTERNAL_API
 inline
 void nsRuleNode::AddRef()
 {
   if (mRefCnt++ == 0 && !IsRoot()) {
     mPresContext->StyleSet()->RuleNodeInUse();
   }
 }
 inline
 void nsRuleNode::Release()
 {
   if (--mRefCnt == 0 && !IsRoot()) {
     mPresContext->StyleSet()->RuleNodeUnused();
   }
 }
 #endif
 #endif

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layout/style/nsStyleSet.h@7e26c7da4463 (annotated)

layout/style/nsStyleSet.h