mirror of
https://github.com/mozilla/gecko-dev.git
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481 lines
18 KiB
C++
481 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* the container for the style sheets that apply to a presentation, and
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* the internal API that the style system exposes for creating (and
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* potentially re-creating) style contexts
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*/
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#ifndef nsStyleSet_h_
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#define nsStyleSet_h_
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#include "mozilla/Attributes.h"
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#include "mozilla/MemoryReporting.h"
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#include "nsIStyleRuleProcessor.h"
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#include "nsCSSStyleSheet.h"
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#include "nsBindingManager.h"
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#include "nsRuleNode.h"
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#include "nsTArray.h"
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#include "nsCOMArray.h"
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#include "nsAutoPtr.h"
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#include "nsIStyleRule.h"
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#include "nsCSSPseudoElements.h"
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#include "gfxFontFeatures.h"
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class nsIURI;
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class nsCSSFontFaceRule;
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class nsCSSKeyframesRule;
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class nsCSSFontFeatureValuesRule;
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class nsCSSPageRule;
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class nsRuleWalker;
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struct ElementDependentRuleProcessorData;
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struct TreeMatchContext;
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class nsEmptyStyleRule MOZ_FINAL : public nsIStyleRule
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{
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NS_DECL_ISUPPORTS
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virtual void MapRuleInfoInto(nsRuleData* aRuleData) MOZ_OVERRIDE;
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#ifdef DEBUG
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virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
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#endif
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};
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class nsInitialStyleRule MOZ_FINAL : public nsIStyleRule
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{
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NS_DECL_ISUPPORTS
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virtual void MapRuleInfoInto(nsRuleData* aRuleData) MOZ_OVERRIDE;
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#ifdef DEBUG
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virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
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#endif
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};
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class nsDisableTextZoomStyleRule MOZ_FINAL : public nsIStyleRule
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{
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NS_DECL_ISUPPORTS
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virtual void MapRuleInfoInto(nsRuleData* aRuleData) MOZ_OVERRIDE;
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#ifdef DEBUG
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virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
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#endif
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};
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// The style set object is created by the document viewer and ownership is
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// then handed off to the PresShell. Only the PresShell should delete a
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// style set.
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class nsStyleSet
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{
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public:
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nsStyleSet();
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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void Init(nsPresContext *aPresContext);
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nsRuleNode* GetRuleTree() { return mRuleTree; }
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// enable / disable the Quirk style sheet
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void EnableQuirkStyleSheet(bool aEnable);
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// get a style context for a non-pseudo frame.
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already_AddRefed<nsStyleContext>
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ResolveStyleFor(mozilla::dom::Element* aElement,
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nsStyleContext* aParentContext);
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already_AddRefed<nsStyleContext>
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ResolveStyleFor(mozilla::dom::Element* aElement,
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nsStyleContext* aParentContext,
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TreeMatchContext& aTreeMatchContext);
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// Get a style context (with the given parent) for the
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// sequence of style rules in the |aRules| array.
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already_AddRefed<nsStyleContext>
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ResolveStyleForRules(nsStyleContext* aParentContext,
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const nsTArray< nsCOMPtr<nsIStyleRule> > &aRules);
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// used in ResolveStyleForRules below
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struct RuleAndLevel
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{
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nsIStyleRule* mRule;
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uint8_t mLevel;
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};
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// Get a new style context for aElement for the rules in aRules
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// aRules is an array of rules and their levels in reverse order,
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// that is from the leaf-most to the root-most rule in the rule tree.
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already_AddRefed<nsStyleContext>
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ResolveStyleForRules(nsStyleContext* aParentContext,
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nsStyleContext* aOldStyle,
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const nsTArray<RuleAndLevel>& aRules);
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// Get a style context that represents aBaseContext, but as though
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// it additionally matched the rules in the aRules array (in that
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// order, as more specific than any other rules).
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already_AddRefed<nsStyleContext>
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ResolveStyleByAddingRules(nsStyleContext* aBaseContext,
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const nsCOMArray<nsIStyleRule> &aRules);
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// Get a style context for a non-element (which no rules will match),
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// such as text nodes, placeholder frames, and the nsFirstLetterFrame
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// for everything after the first letter.
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//
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// Perhaps this should go away and we shouldn't even create style
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// contexts for such content nodes. However, not doing any rule
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// matching for them is a first step.
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already_AddRefed<nsStyleContext>
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ResolveStyleForNonElement(nsStyleContext* aParentContext);
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// Get a style context for a pseudo-element. aParentElement must be
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// non-null. aPseudoID is the nsCSSPseudoElements::Type for the
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// pseudo-element.
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already_AddRefed<nsStyleContext>
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ResolvePseudoElementStyle(mozilla::dom::Element* aParentElement,
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nsCSSPseudoElements::Type aType,
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nsStyleContext* aParentContext);
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// This functions just like ResolvePseudoElementStyle except that it will
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// return nullptr if there are no explicit style rules for that
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// pseudo element.
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already_AddRefed<nsStyleContext>
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ProbePseudoElementStyle(mozilla::dom::Element* aParentElement,
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nsCSSPseudoElements::Type aType,
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nsStyleContext* aParentContext);
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already_AddRefed<nsStyleContext>
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ProbePseudoElementStyle(mozilla::dom::Element* aParentElement,
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nsCSSPseudoElements::Type aType,
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nsStyleContext* aParentContext,
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TreeMatchContext& aTreeMatchContext);
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// Get a style context for an anonymous box. aPseudoTag is the
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// pseudo-tag to use and must be non-null.
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already_AddRefed<nsStyleContext>
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ResolveAnonymousBoxStyle(nsIAtom* aPseudoTag, nsStyleContext* aParentContext);
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#ifdef MOZ_XUL
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// Get a style context for a XUL tree pseudo. aPseudoTag is the
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// pseudo-tag to use and must be non-null. aParentContent must be
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// non-null. aComparator must be non-null.
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already_AddRefed<nsStyleContext>
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ResolveXULTreePseudoStyle(mozilla::dom::Element* aParentElement,
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nsIAtom* aPseudoTag,
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nsStyleContext* aParentContext,
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nsICSSPseudoComparator* aComparator);
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#endif
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// Append all the currently-active font face rules to aArray. Return
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// true for success and false for failure.
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bool AppendFontFaceRules(nsPresContext* aPresContext,
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nsTArray<nsFontFaceRuleContainer>& aArray);
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// Return the winning (in the cascade) @keyframes rule for the given name.
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nsCSSKeyframesRule* KeyframesRuleForName(nsPresContext* aPresContext,
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const nsString& aName);
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// Fetch object for looking up font feature values
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already_AddRefed<gfxFontFeatureValueSet> GetFontFeatureValuesLookup();
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// Append all the currently-active font feature values rules to aArray.
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// Return true for success and false for failure.
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bool AppendFontFeatureValuesRules(nsPresContext* aPresContext,
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nsTArray<nsCSSFontFeatureValuesRule*>& aArray);
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// Append all the currently-active page rules to aArray. Return
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// true for success and false for failure.
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bool AppendPageRules(nsPresContext* aPresContext,
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nsTArray<nsCSSPageRule*>& aArray);
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// Begin ignoring style context destruction, to avoid lots of unnecessary
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// work on document teardown.
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void BeginShutdown(nsPresContext* aPresContext);
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// Free all of the data associated with this style set.
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void Shutdown(nsPresContext* aPresContext);
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// Notification that a style context is being destroyed.
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void NotifyStyleContextDestroyed(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext);
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// Get a new style context that lives in a different parent
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// The new context will be the same as the old if the new parent is the
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// same as the old parent.
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// aElement should be non-null if this is a style context for an
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// element or pseudo-element; in the latter case it should be the
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// real element the pseudo-element is for.
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already_AddRefed<nsStyleContext>
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ReparentStyleContext(nsStyleContext* aStyleContext,
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nsStyleContext* aNewParentContext,
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mozilla::dom::Element* aElement);
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// Test if style is dependent on a document state.
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bool HasDocumentStateDependentStyle(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsEventStates aStateMask);
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// Test if style is dependent on content state
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nsRestyleHint HasStateDependentStyle(nsPresContext* aPresContext,
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mozilla::dom::Element* aElement,
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nsEventStates aStateMask);
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// Test if style is dependent on the presence of an attribute.
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nsRestyleHint HasAttributeDependentStyle(nsPresContext* aPresContext,
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mozilla::dom::Element* aElement,
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nsIAtom* aAttribute,
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int32_t aModType,
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bool aAttrHasChanged);
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/*
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* Do any processing that needs to happen as a result of a change in
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* the characteristics of the medium, and return whether style rules
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* may have changed as a result.
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*/
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bool MediumFeaturesChanged(nsPresContext* aPresContext);
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// APIs for registering objects that can supply additional
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// rules during processing.
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void SetBindingManager(nsBindingManager* aBindingManager)
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{
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mBindingManager = aBindingManager;
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}
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// The "origins" of the CSS cascade, from lowest precedence to
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// highest (for non-!important rules).
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enum sheetType {
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eAgentSheet, // CSS
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eUserSheet, // CSS
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ePresHintSheet,
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eDocSheet, // CSS
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eScopedDocSheet,
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eStyleAttrSheet,
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eOverrideSheet, // CSS
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eAnimationSheet,
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eTransitionSheet,
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eSheetTypeCount
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// be sure to keep the number of bits in |mDirty| below and in
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// NS_RULE_NODE_LEVEL_MASK updated when changing the number of sheet
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// types
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};
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// APIs to manipulate the style sheet lists. The sheets in each
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// list are stored with the most significant sheet last.
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nsresult AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
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nsresult PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
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nsresult RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
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nsresult ReplaceSheets(sheetType aType,
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const nsCOMArray<nsIStyleSheet> &aNewSheets);
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nsresult InsertStyleSheetBefore(sheetType aType, nsIStyleSheet *aNewSheet,
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nsIStyleSheet *aReferenceSheet);
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nsresult DirtyRuleProcessors(sheetType aType);
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// Enable/Disable entire author style level (Doc, ScopedDoc & PresHint levels)
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bool GetAuthorStyleDisabled();
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nsresult SetAuthorStyleDisabled(bool aStyleDisabled);
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int32_t SheetCount(sheetType aType) const {
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return mSheets[aType].Count();
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}
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nsIStyleSheet* StyleSheetAt(sheetType aType, int32_t aIndex) const {
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return mSheets[aType].ObjectAt(aIndex);
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}
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nsresult RemoveDocStyleSheet(nsIStyleSheet* aSheet);
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nsresult AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument);
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void BeginUpdate();
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nsresult EndUpdate();
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// Methods for reconstructing the tree; BeginReconstruct basically moves the
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// old rule tree root and style context roots out of the way,
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// and EndReconstruct destroys the old rule tree when we're done
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nsresult BeginReconstruct();
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// Note: EndReconstruct should not be called if BeginReconstruct fails
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void EndReconstruct();
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// Let the style set know that a particular sheet is the quirks sheet. This
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// sheet must already have been added to the UA sheets. The pointer must not
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// be null. This should only be called once for a given style set.
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void SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet);
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// Return whether the rule tree has cached data such that we need to
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// do dynamic change handling for changes that change the results of
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// media queries or require rebuilding all style data.
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// We don't care whether we have cached rule processors or whether
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// they have cached rule cascades; getting the rule cascades again in
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// order to do rule matching will get the correct rule cascade.
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bool HasCachedStyleData() const {
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return (mRuleTree && mRuleTree->TreeHasCachedData()) || !mRoots.IsEmpty();
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}
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// Notify the style set that a rulenode is no longer in use, or was
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// just created and is not in use yet.
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void RuleNodeUnused() {
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++mUnusedRuleNodeCount;
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}
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// Notify the style set that a rulenode that wasn't in use now is
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void RuleNodeInUse() {
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--mUnusedRuleNodeCount;
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}
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nsCSSStyleSheet::EnsureUniqueInnerResult EnsureUniqueInnerOnCSSSheets();
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nsIStyleRule* InitialStyleRule();
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private:
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nsStyleSet(const nsStyleSet& aCopy) MOZ_DELETE;
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nsStyleSet& operator=(const nsStyleSet& aCopy) MOZ_DELETE;
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// Run mark-and-sweep GC on mRuleTree and mOldRuleTrees, based on mRoots.
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void GCRuleTrees();
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// Update the rule processor list after a change to the style sheet list.
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nsresult GatherRuleProcessors(sheetType aType);
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void AddImportantRules(nsRuleNode* aCurrLevelNode,
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nsRuleNode* aLastPrevLevelNode,
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nsRuleWalker* aRuleWalker);
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// Move aRuleWalker forward by the appropriate rule if we need to add
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// a rule due to property restrictions on pseudo-elements.
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void WalkRestrictionRule(nsCSSPseudoElements::Type aPseudoType,
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nsRuleWalker* aRuleWalker);
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void WalkDisableTextZoomRule(mozilla::dom::Element* aElement,
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nsRuleWalker* aRuleWalker);
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#ifdef DEBUG
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// Just like AddImportantRules except it doesn't actually add anything; it
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// just asserts that there are no important rules between aCurrLevelNode and
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// aLastPrevLevelNode.
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void AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
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nsRuleNode* aLastPrevLevelNode);
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// Just like AddImportantRules except it doesn't actually add anything; it
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// just asserts that there are no CSS rules between aCurrLevelNode and
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// aLastPrevLevelNode. Mostly useful for the preshint level.
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void AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
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nsRuleNode* aLastPrevLevelNode);
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#endif
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// Enumerate the rules in a way that cares about the order of the
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// rules.
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// aElement is the element the rules are for. It might be null. aData
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// is the closure to pass to aCollectorFunc. If aContent is not null,
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// aData must be a RuleProcessorData*
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void FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc,
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RuleProcessorData* aData, mozilla::dom::Element* aElement,
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nsRuleWalker* aRuleWalker);
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// Enumerate all the rules in a way that doesn't care about the order
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// of the rules and break out if the enumeration is halted.
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void WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc,
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ElementDependentRuleProcessorData* aData,
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bool aWalkAllXBLStylesheets);
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/**
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* Bit-flags that can be passed to GetContext() in its parameter 'aFlags'.
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*/
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enum {
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eNoFlags = 0,
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eIsLink = 1 << 0,
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eIsVisitedLink = 1 << 1,
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eDoAnimation = 1 << 2,
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// Indicates that we should skip the flex-item-specific chunk of
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// ApplyStyleFixups(). This is useful if our parent has "display: flex"
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// but we can tell it's not going to actually be a flex container (e.g. if
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// it's the outer frame of a button widget, and we're the inline frame for
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// the button's label).
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eSkipFlexItemStyleFixup = 1 << 3
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};
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already_AddRefed<nsStyleContext>
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GetContext(nsStyleContext* aParentContext,
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nsRuleNode* aRuleNode,
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nsRuleNode* aVisitedRuleNode,
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nsIAtom* aPseudoTag,
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nsCSSPseudoElements::Type aPseudoType,
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mozilla::dom::Element* aElementForAnimation,
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uint32_t aFlags);
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nsPresContext* PresContext() { return mRuleTree->PresContext(); }
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// The sheets in each array in mSheets are stored with the most significant
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// sheet last.
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// The arrays for ePresHintSheet, eStyleAttrSheet, eTransitionSheet,
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// and eAnimationSheet are always empty. (FIXME: We should reduce
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// the storage needed for them.)
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nsCOMArray<nsIStyleSheet> mSheets[eSheetTypeCount];
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// mRuleProcessors[eScopedDocSheet] is always null; rule processors
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// for scoped style sheets are stored in mScopedDocSheetRuleProcessors.
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nsCOMPtr<nsIStyleRuleProcessor> mRuleProcessors[eSheetTypeCount];
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// Rule processors for HTML5 scoped style sheets, one per scope.
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nsTArray<nsCOMPtr<nsIStyleRuleProcessor> > mScopedDocSheetRuleProcessors;
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// cached instance for enabling/disabling
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nsCOMPtr<nsIStyleSheet> mQuirkStyleSheet;
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nsRefPtr<nsBindingManager> mBindingManager;
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nsRuleNode* mRuleTree; // This is the root of our rule tree. It is a
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// lexicographic tree of matched rules that style
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// contexts use to look up properties.
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uint16_t mBatching;
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unsigned mInShutdown : 1;
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unsigned mAuthorStyleDisabled: 1;
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unsigned mInReconstruct : 1;
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unsigned mInitFontFeatureValuesLookup : 1;
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unsigned mDirty : 9; // one dirty bit is used per sheet type
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uint32_t mUnusedRuleNodeCount; // used to batch rule node GC
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nsTArray<nsStyleContext*> mRoots; // style contexts with no parent
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// Empty style rules to force things that restrict which properties
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// apply into different branches of the rule tree.
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nsRefPtr<nsEmptyStyleRule> mFirstLineRule, mFirstLetterRule, mPlaceholderRule;
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// Style rule which sets all properties to their initial values for
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// determining when context-sensitive values are in use.
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nsRefPtr<nsInitialStyleRule> mInitialStyleRule;
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// Style rule that sets the internal -x-text-zoom property on
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// <svg:text> elements to disable the effect of text zooming.
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nsRefPtr<nsDisableTextZoomStyleRule> mDisableTextZoomStyleRule;
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// Old rule trees, which should only be non-empty between
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// BeginReconstruct and EndReconstruct, but in case of bugs that cause
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// style contexts to exist too long, may last longer.
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nsTArray<nsRuleNode*> mOldRuleTrees;
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// whether font feature values lookup object needs initialization
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nsRefPtr<gfxFontFeatureValueSet> mFontFeatureValuesLookup;
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};
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#ifdef MOZILLA_INTERNAL_API
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inline
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void nsRuleNode::AddRef()
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{
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if (mRefCnt++ == 0 && !IsRoot()) {
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mPresContext->StyleSet()->RuleNodeInUse();
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}
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}
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inline
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void nsRuleNode::Release()
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{
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if (--mRefCnt == 0 && !IsRoot()) {
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mPresContext->StyleSet()->RuleNodeUnused();
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}
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}
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#endif
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#endif
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