gecko/layout/style/nsCSSRuleProcessor.h
2011-10-17 10:59:28 -04:00

188 lines
6.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* style rule processor for CSS style sheets, responsible for selector
* matching and cascading
*/
#ifndef nsCSSRuleProcessor_h_
#define nsCSSRuleProcessor_h_
#include "nsIStyleRuleProcessor.h"
#include "nsCSSStyleSheet.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "nsCSSRules.h"
#include "nsRuleWalker.h"
struct RuleCascadeData;
struct nsCSSSelectorList;
struct CascadeEnumData;
struct TreeMatchContext;
class nsCSSKeyframesRule;
/**
* 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<nsCSSStyleSheet> > sheet_array_type;
nsCSSRuleProcessor(const sheet_array_type& aSheets, PRUint8 aSheetType);
virtual ~nsCSSRuleProcessor();
NS_DECL_ISUPPORTS
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 nsEventStates GetContentState(mozilla::dom::Element* aElement);
/*
* Helper to get the content state for :visited handling for an element
*/
static nsEventStates GetContentStateForVisitedHandling(
mozilla::dom::Element* aElement,
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);
virtual void RulesMatching(PseudoElementRuleProcessorData* aData);
virtual void RulesMatching(AnonBoxRuleProcessorData* aData);
#ifdef MOZ_XUL
virtual void RulesMatching(XULTreeRuleProcessorData* aData);
#endif
virtual nsRestyleHint HasStateDependentStyle(StateRuleProcessorData* aData);
virtual bool HasDocumentStateDependentStyle(StateRuleProcessorData* aData);
virtual nsRestyleHint
HasAttributeDependentStyle(AttributeRuleProcessorData* aData);
virtual bool MediumFeaturesChanged(nsPresContext* aPresContext);
virtual PRInt64 SizeOf() const;
// 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);
bool AppendKeyframesRules(nsPresContext* aPresContext,
nsTArray<nsCSSKeyframesRule*>& aArray);
#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 PRUint8 GetWindowsThemeIdentifier();
static void SetWindowsThemeIdentifier(PRUint8 aId) {
sWinThemeId = aId;
}
#endif
private:
static bool CascadeSheet(nsCSSStyleSheet* aSheet, CascadeEnumData* aData);
RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
void RefreshRuleCascade(nsPresContext* aPresContext);
// 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;
// type of stylesheet using this processor
PRUint8 mSheetType; // == nsStyleSet::sheetType
#ifdef XP_WIN
static PRUint8 sWinThemeId;
#endif
};
#endif /* nsCSSRuleProcessor_h_ */