gecko-dev/layout/style/nsCSSRuleProcessor.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:tabstop=2:expandtab:shiftwidth=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/. */
/*
* style rule processor for CSS style sheets, responsible for selector
* matching and cascading
*/
#ifndef nsCSSRuleProcessor_h_
#define nsCSSRuleProcessor_h_
#include "mozilla/Attributes.h"
#include "mozilla/EventStates.h"
#include "mozilla/MemoryReporting.h"
#include "nsIStyleRuleProcessor.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "nsRuleWalker.h"
struct CascadeEnumData;
struct nsCSSSelector;
struct nsCSSSelectorList;
struct RuleCascadeData;
struct TreeMatchContext;
class nsCSSKeyframesRule;
class nsCSSPageRule;
class nsCSSFontFeatureValuesRule;
class nsCSSCounterStyleRule;
namespace mozilla {
class CSSStyleSheet;
} // namespace mozilla
/**
* The CSS style rule processor provides a mechanism for sibling style
* sheets to combine their rule processing in order to allow proper
* cascading to happen.
*
* CSS style rule processors keep a live reference on all style sheets
* bound to them. The CSS style sheets keep a weak reference to all the
* processors that they are bound to (many to many). The CSS style sheet
* is told when the rule processor is going away (via DropRuleProcessor).
*/
class nsCSSRuleProcessor: public nsIStyleRuleProcessor {
public:
typedef nsTArray<nsRefPtr<mozilla::CSSStyleSheet>> sheet_array_type;
// aScopeElement must be non-null iff aSheetType is
// nsStyleSet::eScopedDocSheet.
nsCSSRuleProcessor(const sheet_array_type& aSheets,
uint8_t aSheetType,
mozilla::dom::Element* aScopeElement);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(nsCSSRuleProcessor)
public:
nsresult ClearRuleCascades();
static nsresult Startup();
static void Shutdown();
static void FreeSystemMetrics();
static bool HasSystemMetric(nsIAtom* aMetric);
/*
* Returns true if the given aElement matches one of the
* selectors in aSelectorList. Note that this method will assume
* the given aElement is not a relevant link. aSelectorList must not
* include any pseudo-element selectors. aSelectorList is allowed
* to be null; in this case false will be returned.
*/
static bool SelectorListMatches(mozilla::dom::Element* aElement,
TreeMatchContext& aTreeMatchContext,
nsCSSSelectorList* aSelectorList);
/*
* Helper to get the content state for a content node. This may be
* slightly adjusted from IntrinsicState().
*/
static mozilla::EventStates GetContentState(
mozilla::dom::Element* aElement,
const TreeMatchContext& aTreeMatchContext);
/*
* Helper to get the content state for :visited handling for an element
*/
static mozilla::EventStates GetContentStateForVisitedHandling(
mozilla::dom::Element* aElement,
const TreeMatchContext& aTreeMatchContext,
nsRuleWalker::VisitedHandlingType aVisitedHandling,
bool aIsRelevantLink);
/*
* Helper to test whether a node is a link
*/
static bool IsLink(mozilla::dom::Element* aElement);
// nsIStyleRuleProcessor
virtual void RulesMatching(ElementRuleProcessorData* aData) MOZ_OVERRIDE;
virtual void RulesMatching(PseudoElementRuleProcessorData* aData) MOZ_OVERRIDE;
virtual void RulesMatching(AnonBoxRuleProcessorData* aData) MOZ_OVERRIDE;
#ifdef MOZ_XUL
virtual void RulesMatching(XULTreeRuleProcessorData* aData) MOZ_OVERRIDE;
#endif
virtual nsRestyleHint HasStateDependentStyle(StateRuleProcessorData* aData) MOZ_OVERRIDE;
virtual nsRestyleHint HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData) MOZ_OVERRIDE;
virtual bool HasDocumentStateDependentStyle(StateRuleProcessorData* aData) MOZ_OVERRIDE;
virtual nsRestyleHint
HasAttributeDependentStyle(AttributeRuleProcessorData* aData) MOZ_OVERRIDE;
virtual bool MediumFeaturesChanged(nsPresContext* aPresContext) MOZ_OVERRIDE;
virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
const MOZ_MUST_OVERRIDE MOZ_OVERRIDE;
virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf)
const MOZ_MUST_OVERRIDE MOZ_OVERRIDE;
// 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);
nsCSSKeyframesRule* KeyframesRuleForName(nsPresContext* aPresContext,
const nsString& aName);
nsCSSCounterStyleRule* CounterStyleRuleForName(nsPresContext* aPresContext,
const nsAString& aName);
bool AppendPageRules(nsPresContext* aPresContext,
nsTArray<nsCSSPageRule*>& aArray);
bool AppendFontFeatureValuesRules(nsPresContext* aPresContext,
nsTArray<nsCSSFontFeatureValuesRule*>& aArray);
/**
* Returns the scope element for the scoped style sheets this rule
* processor is for. If this is not a rule processor for scoped style
* sheets, it returns null.
*/
mozilla::dom::Element* GetScopeElement() const { return mScopeElement; }
#ifdef DEBUG
void AssertQuirksChangeOK() {
NS_ASSERTION(!mRuleCascades, "can't toggle quirks style sheet without "
"clearing rule cascades");
}
#endif
#ifdef XP_WIN
// Cached theme identifier for the moz-windows-theme media query.
static uint8_t GetWindowsThemeIdentifier();
static void SetWindowsThemeIdentifier(uint8_t aId) {
sWinThemeId = aId;
}
#endif
struct StateSelector {
StateSelector(mozilla::EventStates aStates, nsCSSSelector* aSelector)
: mStates(aStates),
mSelector(aSelector)
{}
mozilla::EventStates mStates;
nsCSSSelector* mSelector;
};
protected:
virtual ~nsCSSRuleProcessor();
private:
static bool CascadeSheet(mozilla::CSSStyleSheet* aSheet,
CascadeEnumData* aData);
RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
void RefreshRuleCascade(nsPresContext* aPresContext);
nsRestyleHint HasStateDependentStyle(ElementDependentRuleProcessorData* aData,
mozilla::dom::Element* aStatefulElement,
nsCSSPseudoElements::Type aPseudoType,
mozilla::EventStates aStateMask);
void ClearSheets();
// The sheet order here is the same as in nsStyleSet::mSheets
sheet_array_type mSheets;
// active first, then cached (most recent first)
RuleCascadeData* mRuleCascades;
// The last pres context for which GetRuleCascades was called.
nsPresContext *mLastPresContext;
// The scope element for this rule processor's scoped style sheets.
// Only used if mSheetType == nsStyleSet::eScopedDocSheet.
nsRefPtr<mozilla::dom::Element> mScopeElement;
// type of stylesheet using this processor
uint8_t mSheetType; // == nsStyleSet::sheetType
#ifdef XP_WIN
static uint8_t sWinThemeId;
#endif
};
#endif /* nsCSSRuleProcessor_h_ */