mirror of
https://github.com/mozilla/gecko-dev.git
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188 lines
6.4 KiB
C++
188 lines
6.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* style rule processor for CSS style sheets, responsible for selector
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* matching and cascading
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*/
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#ifndef nsCSSRuleProcessor_h_
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#define nsCSSRuleProcessor_h_
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#include "nsIStyleRuleProcessor.h"
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#include "nsCSSStyleSheet.h"
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#include "nsTArray.h"
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#include "nsAutoPtr.h"
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#include "nsCSSRules.h"
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#include "nsRuleWalker.h"
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struct RuleCascadeData;
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struct nsCSSSelectorList;
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struct CascadeEnumData;
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struct TreeMatchContext;
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class nsCSSKeyframesRule;
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/**
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* The CSS style rule processor provides a mechanism for sibling style
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* sheets to combine their rule processing in order to allow proper
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* cascading to happen.
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*
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* CSS style rule processors keep a live reference on all style sheets
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* bound to them. The CSS style sheets keep a weak reference to all the
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* processors that they are bound to (many to many). The CSS style sheet
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* is told when the rule processor is going away (via DropRuleProcessor).
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*/
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class nsCSSRuleProcessor: public nsIStyleRuleProcessor {
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public:
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typedef nsTArray<nsRefPtr<nsCSSStyleSheet> > sheet_array_type;
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nsCSSRuleProcessor(const sheet_array_type& aSheets, PRUint8 aSheetType);
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virtual ~nsCSSRuleProcessor();
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NS_DECL_ISUPPORTS
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public:
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nsresult ClearRuleCascades();
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static nsresult Startup();
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static void Shutdown();
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static void FreeSystemMetrics();
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static bool HasSystemMetric(nsIAtom* aMetric);
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/*
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* Returns true if the given aElement matches one of the
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* selectors in aSelectorList. Note that this method will assume
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* the given aElement is not a relevant link. aSelectorList must not
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* include any pseudo-element selectors. aSelectorList is allowed
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* to be null; in this case PR_FALSE will be returned.
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*/
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static bool SelectorListMatches(mozilla::dom::Element* aElement,
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TreeMatchContext& aTreeMatchContext,
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nsCSSSelectorList* aSelectorList);
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/*
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* Helper to get the content state for a content node. This may be
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* slightly adjusted from IntrinsicState().
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*/
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static nsEventStates GetContentState(mozilla::dom::Element* aElement);
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/*
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* Helper to get the content state for :visited handling for an element
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*/
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static nsEventStates GetContentStateForVisitedHandling(
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mozilla::dom::Element* aElement,
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nsRuleWalker::VisitedHandlingType aVisitedHandling,
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bool aIsRelevantLink);
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/*
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* Helper to test whether a node is a link
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*/
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static bool IsLink(mozilla::dom::Element* aElement);
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// nsIStyleRuleProcessor
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virtual void RulesMatching(ElementRuleProcessorData* aData);
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virtual void RulesMatching(PseudoElementRuleProcessorData* aData);
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virtual void RulesMatching(AnonBoxRuleProcessorData* aData);
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#ifdef MOZ_XUL
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virtual void RulesMatching(XULTreeRuleProcessorData* aData);
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#endif
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virtual nsRestyleHint HasStateDependentStyle(StateRuleProcessorData* aData);
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virtual bool HasDocumentStateDependentStyle(StateRuleProcessorData* aData);
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virtual nsRestyleHint
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HasAttributeDependentStyle(AttributeRuleProcessorData* aData);
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virtual bool MediumFeaturesChanged(nsPresContext* aPresContext);
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virtual PRInt64 SizeOf() const;
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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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bool AppendKeyframesRules(nsPresContext* aPresContext,
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nsTArray<nsCSSKeyframesRule*>& aArray);
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#ifdef DEBUG
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void AssertQuirksChangeOK() {
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NS_ASSERTION(!mRuleCascades, "can't toggle quirks style sheet without "
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"clearing rule cascades");
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}
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#endif
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#ifdef XP_WIN
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// Cached theme identifier for the moz-windows-theme media query.
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static PRUint8 GetWindowsThemeIdentifier();
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static void SetWindowsThemeIdentifier(PRUint8 aId) {
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sWinThemeId = aId;
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}
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#endif
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private:
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static bool CascadeSheet(nsCSSStyleSheet* aSheet, CascadeEnumData* aData);
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RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
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void RefreshRuleCascade(nsPresContext* aPresContext);
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// The sheet order here is the same as in nsStyleSet::mSheets
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sheet_array_type mSheets;
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// active first, then cached (most recent first)
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RuleCascadeData* mRuleCascades;
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// The last pres context for which GetRuleCascades was called.
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nsPresContext *mLastPresContext;
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// type of stylesheet using this processor
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PRUint8 mSheetType; // == nsStyleSet::sheetType
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#ifdef XP_WIN
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static PRUint8 sWinThemeId;
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#endif
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};
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#endif /* nsCSSRuleProcessor_h_ */
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