1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/style/nsCSSRuleProcessor.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,202 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/*
1.11 + * style rule processor for CSS style sheets, responsible for selector
1.12 + * matching and cascading
1.13 + */
1.14 +
1.15 +#ifndef nsCSSRuleProcessor_h_
1.16 +#define nsCSSRuleProcessor_h_
1.17 +
1.18 +#include "mozilla/Attributes.h"
1.19 +#include "mozilla/EventStates.h"
1.20 +#include "mozilla/MemoryReporting.h"
1.21 +#include "nsIStyleRuleProcessor.h"
1.22 +#include "nsCSSStyleSheet.h"
1.23 +#include "nsTArray.h"
1.24 +#include "nsAutoPtr.h"
1.25 +#include "nsRuleWalker.h"
1.26 +
1.27 +struct CascadeEnumData;
1.28 +struct nsCSSSelector;
1.29 +struct nsCSSSelectorList;
1.30 +struct RuleCascadeData;
1.31 +struct TreeMatchContext;
1.32 +class nsCSSKeyframesRule;
1.33 +class nsCSSPageRule;
1.34 +class nsCSSFontFeatureValuesRule;
1.35 +
1.36 +/**
1.37 + * The CSS style rule processor provides a mechanism for sibling style
1.38 + * sheets to combine their rule processing in order to allow proper
1.39 + * cascading to happen.
1.40 + *
1.41 + * CSS style rule processors keep a live reference on all style sheets
1.42 + * bound to them. The CSS style sheets keep a weak reference to all the
1.43 + * processors that they are bound to (many to many). The CSS style sheet
1.44 + * is told when the rule processor is going away (via DropRuleProcessor).
1.45 + */
1.46 +
1.47 +class nsCSSRuleProcessor: public nsIStyleRuleProcessor {
1.48 +public:
1.49 + typedef nsTArray<nsRefPtr<nsCSSStyleSheet> > sheet_array_type;
1.50 +
1.51 + // aScopeElement must be non-null iff aSheetType is
1.52 + // nsStyleSet::eScopedDocSheet.
1.53 + nsCSSRuleProcessor(const sheet_array_type& aSheets,
1.54 + uint8_t aSheetType,
1.55 + mozilla::dom::Element* aScopeElement);
1.56 + virtual ~nsCSSRuleProcessor();
1.57 +
1.58 + NS_DECL_ISUPPORTS
1.59 +
1.60 +public:
1.61 + nsresult ClearRuleCascades();
1.62 +
1.63 + static nsresult Startup();
1.64 + static void Shutdown();
1.65 + static void FreeSystemMetrics();
1.66 + static bool HasSystemMetric(nsIAtom* aMetric);
1.67 +
1.68 + /*
1.69 + * Returns true if the given aElement matches one of the
1.70 + * selectors in aSelectorList. Note that this method will assume
1.71 + * the given aElement is not a relevant link. aSelectorList must not
1.72 + * include any pseudo-element selectors. aSelectorList is allowed
1.73 + * to be null; in this case false will be returned.
1.74 + */
1.75 + static bool SelectorListMatches(mozilla::dom::Element* aElement,
1.76 + TreeMatchContext& aTreeMatchContext,
1.77 + nsCSSSelectorList* aSelectorList);
1.78 +
1.79 + /*
1.80 + * Helper to get the content state for a content node. This may be
1.81 + * slightly adjusted from IntrinsicState().
1.82 + */
1.83 + static mozilla::EventStates GetContentState(
1.84 + mozilla::dom::Element* aElement,
1.85 + const TreeMatchContext& aTreeMatchContext);
1.86 +
1.87 + /*
1.88 + * Helper to get the content state for :visited handling for an element
1.89 + */
1.90 + static mozilla::EventStates GetContentStateForVisitedHandling(
1.91 + mozilla::dom::Element* aElement,
1.92 + const TreeMatchContext& aTreeMatchContext,
1.93 + nsRuleWalker::VisitedHandlingType aVisitedHandling,
1.94 + bool aIsRelevantLink);
1.95 +
1.96 + /*
1.97 + * Helper to test whether a node is a link
1.98 + */
1.99 + static bool IsLink(mozilla::dom::Element* aElement);
1.100 +
1.101 + // nsIStyleRuleProcessor
1.102 + virtual void RulesMatching(ElementRuleProcessorData* aData) MOZ_OVERRIDE;
1.103 +
1.104 + virtual void RulesMatching(PseudoElementRuleProcessorData* aData) MOZ_OVERRIDE;
1.105 +
1.106 + virtual void RulesMatching(AnonBoxRuleProcessorData* aData) MOZ_OVERRIDE;
1.107 +
1.108 +#ifdef MOZ_XUL
1.109 + virtual void RulesMatching(XULTreeRuleProcessorData* aData) MOZ_OVERRIDE;
1.110 +#endif
1.111 +
1.112 + virtual nsRestyleHint HasStateDependentStyle(StateRuleProcessorData* aData) MOZ_OVERRIDE;
1.113 + virtual nsRestyleHint HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData) MOZ_OVERRIDE;
1.114 +
1.115 + virtual bool HasDocumentStateDependentStyle(StateRuleProcessorData* aData) MOZ_OVERRIDE;
1.116 +
1.117 + virtual nsRestyleHint
1.118 + HasAttributeDependentStyle(AttributeRuleProcessorData* aData) MOZ_OVERRIDE;
1.119 +
1.120 + virtual bool MediumFeaturesChanged(nsPresContext* aPresContext) MOZ_OVERRIDE;
1.121 +
1.122 + virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
1.123 + const MOZ_MUST_OVERRIDE MOZ_OVERRIDE;
1.124 + virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf)
1.125 + const MOZ_MUST_OVERRIDE MOZ_OVERRIDE;
1.126 +
1.127 + // Append all the currently-active font face rules to aArray. Return
1.128 + // true for success and false for failure.
1.129 + bool AppendFontFaceRules(nsPresContext* aPresContext,
1.130 + nsTArray<nsFontFaceRuleContainer>& aArray);
1.131 +
1.132 + nsCSSKeyframesRule* KeyframesRuleForName(nsPresContext* aPresContext,
1.133 + const nsString& aName);
1.134 +
1.135 + bool AppendPageRules(nsPresContext* aPresContext,
1.136 + nsTArray<nsCSSPageRule*>& aArray);
1.137 +
1.138 + bool AppendFontFeatureValuesRules(nsPresContext* aPresContext,
1.139 + nsTArray<nsCSSFontFeatureValuesRule*>& aArray);
1.140 +
1.141 + /**
1.142 + * Returns the scope element for the scoped style sheets this rule
1.143 + * processor is for. If this is not a rule processor for scoped style
1.144 + * sheets, it returns null.
1.145 + */
1.146 + mozilla::dom::Element* GetScopeElement() const { return mScopeElement; }
1.147 +
1.148 +#ifdef DEBUG
1.149 + void AssertQuirksChangeOK() {
1.150 + NS_ASSERTION(!mRuleCascades, "can't toggle quirks style sheet without "
1.151 + "clearing rule cascades");
1.152 + }
1.153 +#endif
1.154 +
1.155 +#ifdef XP_WIN
1.156 + // Cached theme identifier for the moz-windows-theme media query.
1.157 + static uint8_t GetWindowsThemeIdentifier();
1.158 + static void SetWindowsThemeIdentifier(uint8_t aId) {
1.159 + sWinThemeId = aId;
1.160 + }
1.161 +#endif
1.162 +
1.163 + struct StateSelector {
1.164 + StateSelector(mozilla::EventStates aStates, nsCSSSelector* aSelector)
1.165 + : mStates(aStates),
1.166 + mSelector(aSelector)
1.167 + {}
1.168 +
1.169 + mozilla::EventStates mStates;
1.170 + nsCSSSelector* mSelector;
1.171 + };
1.172 +
1.173 +private:
1.174 + static bool CascadeSheet(nsCSSStyleSheet* aSheet, CascadeEnumData* aData);
1.175 +
1.176 + RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
1.177 + void RefreshRuleCascade(nsPresContext* aPresContext);
1.178 +
1.179 + nsRestyleHint HasStateDependentStyle(ElementDependentRuleProcessorData* aData,
1.180 + mozilla::dom::Element* aStatefulElement,
1.181 + nsCSSPseudoElements::Type aPseudoType,
1.182 + mozilla::EventStates aStateMask);
1.183 +
1.184 + // The sheet order here is the same as in nsStyleSet::mSheets
1.185 + sheet_array_type mSheets;
1.186 +
1.187 + // active first, then cached (most recent first)
1.188 + RuleCascadeData* mRuleCascades;
1.189 +
1.190 + // The last pres context for which GetRuleCascades was called.
1.191 + nsPresContext *mLastPresContext;
1.192 +
1.193 + // The scope element for this rule processor's scoped style sheets.
1.194 + // Only used if mSheetType == nsStyleSet::eScopedDocSheet.
1.195 + nsRefPtr<mozilla::dom::Element> mScopeElement;
1.196 +
1.197 + // type of stylesheet using this processor
1.198 + uint8_t mSheetType; // == nsStyleSet::sheetType
1.199 +
1.200 +#ifdef XP_WIN
1.201 + static uint8_t sWinThemeId;
1.202 +#endif
1.203 +};
1.204 +
1.205 +#endif /* nsCSSRuleProcessor_h_ */
