gecko-dev/layout/style/nsStyleSet.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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):
* Daniel Glazman <glazman@netscape.com>
* Brian Ryner <bryner@brianryner.com>
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* 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
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* the provisions above, a recipient may use your version of this file under
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*
* ***** END LICENSE BLOCK ***** */
/*
* the container for the style sheets that apply to a presentation, and
* the internal API that the style system exposes for creating (and
* potentially re-creating) style contexts
*/
#ifndef nsStyleSet_h_
#define nsStyleSet_h_
#include "nsIStyleRuleProcessor.h"
#include "nsICSSStyleSheet.h"
#include "nsBindingManager.h"
#include "nsRuleNode.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsAutoPtr.h"
#include "nsIStyleRule.h"
class nsIURI;
class nsCSSFontFaceRule;
class nsEmptyStyleRule : public nsIStyleRule
{
NS_DECL_ISUPPORTS
NS_IMETHOD MapRuleInfoInto(nsRuleData* aRuleData);
#ifdef DEBUG
NS_IMETHOD List(FILE* out = stdout, PRInt32 aIndent = 0) const;
#endif
};
// The style set object is created by the document viewer and ownership is
// then handed off to the PresShell. Only the PresShell should delete a
// style set.
class nsStyleSet
{
public:
nsStyleSet();
// Initialize the object. You must check the return code and not use
// the nsStyleSet if Init() fails.
nsresult Init(nsPresContext *aPresContext);
// For getting the cached default data in case we hit out-of-memory.
// To be used only by nsRuleNode.
nsCachedStyleData* DefaultStyleData() { return &mDefaultStyleData; }
nsRuleNode* GetRuleTree() { return mRuleTree; }
// enable / disable the Quirk style sheet
void EnableQuirkStyleSheet(PRBool aEnable);
// get a style context for a non-pseudo frame.
already_AddRefed<nsStyleContext>
ResolveStyleFor(nsIContent* aContent, nsStyleContext* aParentContext);
// get a style context from some rules
already_AddRefed<nsStyleContext>
ResolveStyleForRules(nsStyleContext* aParentContext, const nsCOMArray<nsIStyleRule> &rules);
// Get a style context for a non-element (which no rules will match),
// such as text nodes, placeholder frames, and the nsFirstLetterFrame
// for everything after the first letter.
//
// Perhaps this should go away and we shouldn't even create style
// contexts for such content nodes. However, not doing any rule
// matching for them is a first step.
already_AddRefed<nsStyleContext>
ResolveStyleForNonElement(nsStyleContext* aParentContext);
// get a style context for a pseudo-element (i.e.,
// |aPseudoTag == nsCOMPtr<nsIAtom>(do_GetAtom(":first-line"))|, in
// which case aParentContent must be non-null, or an anonymous box, in
// which case it may be null or non-null.
already_AddRefed<nsStyleContext>
ResolvePseudoStyleFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext,
nsICSSPseudoComparator* aComparator = nsnull);
// This functions just like ResolvePseudoStyleFor except that it will
// return nsnull if there are no explicit style rules for that
// pseudo element. It should be used only for pseudo-elements.
already_AddRefed<nsStyleContext>
ProbePseudoStyleFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext);
// Append all the currently-active font face rules to aArray. Return
// true for success and false for failure.
PRBool AppendFontFaceRules(nsPresContext* aPresContext,
nsTArray<nsFontFaceRuleContainer>& aArray);
// Begin ignoring style context destruction, to avoid lots of unnecessary
// work on document teardown.
void BeginShutdown(nsPresContext* aPresContext);
// Free all of the data associated with this style set.
void Shutdown(nsPresContext* aPresContext);
// Notification that a style context is being destroyed.
void NotifyStyleContextDestroyed(nsPresContext* aPresContext,
nsStyleContext* aStyleContext);
// Get a new style context that lives in a different parent
// The new context will be the same as the old if the new parent is the
// same as the old parent.
already_AddRefed<nsStyleContext>
ReParentStyleContext(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsStyleContext* aNewParentContext);
// Test if style is dependent on content state
nsReStyleHint HasStateDependentStyle(nsPresContext* aPresContext,
nsIContent* aContent,
PRInt32 aStateMask);
// Test if style is dependent on the presence of an attribute.
nsReStyleHint HasAttributeDependentStyle(nsPresContext* aPresContext,
nsIContent* aContent,
nsIAtom* aAttribute,
PRInt32 aModType,
PRUint32 aStateMask);
/*
* Do any processing that needs to happen as a result of a change in
* the characteristics of the medium, and return whether style rules
* may have changed as a result.
*/
PRBool MediumFeaturesChanged(nsPresContext* aPresContext);
// APIs for registering objects that can supply additional
// rules during processing.
void SetBindingManager(nsBindingManager* aBindingManager)
{
mBindingManager = aBindingManager;
}
// The "origins" of the CSS cascade, from lowest precedence to
// highest (for non-!important rules).
enum sheetType {
eAgentSheet, // CSS
ePresHintSheet,
eUserSheet, // CSS
eHTMLPresHintSheet,
eDocSheet, // CSS
eStyleAttrSheet,
eOverrideSheet, // CSS
eSheetTypeCount
// be sure to keep the number of bits in |mDirty| below and in
// NS_RULE_NODE_LEVEL_MASK updated when changing the number of sheet
// types
};
// APIs to manipulate the style sheet lists. The sheets in each
// list are stored with the most significant sheet last.
nsresult AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
nsresult PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
nsresult RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet);
nsresult ReplaceSheets(sheetType aType,
const nsCOMArray<nsIStyleSheet> &aNewSheets);
//Enable/Disable entire author style level (Doc & PresHint levels)
PRBool GetAuthorStyleDisabled();
nsresult SetAuthorStyleDisabled(PRBool aStyleDisabled);
PRInt32 SheetCount(sheetType aType) const {
return mSheets[aType].Count();
}
nsIStyleSheet* StyleSheetAt(sheetType aType, PRInt32 aIndex) const {
return mSheets[aType].ObjectAt(aIndex);
}
nsresult AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument);
void BeginUpdate();
nsresult EndUpdate();
// Methods for reconstructing the tree; BeginReconstruct basically moves the
// old rule tree root and style context roots out of the way,
// and EndReconstruct destroys the old rule tree when we're done
nsresult BeginReconstruct();
// Note: EndReconstruct should not be called if BeginReconstruct fails
void EndReconstruct();
// Let the style set know that a particular sheet is the quirks sheet. This
// sheet must already have been added to the UA sheets. The pointer must not
// be null. This should only be called once for a given style set.
void SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet);
// Return whether the rule tree has cached data such that we need to
// do dynamic change handling for changes that change the results of
// media queries or require rebuilding all style data.
// We don't care whether we have cached rule processors or whether
// they have cached rule cascades; getting the rule cascades again in
// order to do rule matching will get the correct rule cascade.
PRBool HasCachedStyleData() const {
return (mRuleTree && mRuleTree->TreeHasCachedData()) || !mRoots.IsEmpty();
}
private:
// Not to be implemented
nsStyleSet(const nsStyleSet& aCopy);
nsStyleSet& operator=(const nsStyleSet& aCopy);
// Returns false on out-of-memory.
PRBool BuildDefaultStyleData(nsPresContext* aPresContext);
// Run mark-and-sweep GC on mRuleTree and mOldRuleTrees, based on mRoots.
void GCRuleTrees();
// Update the rule processor list after a change to the style sheet list.
nsresult GatherRuleProcessors(sheetType aType);
void AddImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode);
// Move mRuleWalker forward by the appropriate rule if we need to add
// a rule due to property restrictions on pseudo-elements.
void WalkRestrictionRule(nsIAtom* aPseudoType);
#ifdef DEBUG
// Just like AddImportantRules except it doesn't actually add anything; it
// just asserts that there are no important rules between aCurrLevelNode and
// aLastPrevLevelNode.
void AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode);
// Just like AddImportantRules except it doesn't actually add anything; it
// just asserts that there are no CSS rules between aCurrLevelNode and
// aLastPrevLevelNode. Mostly useful for the preshint levels.
void AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode);
#endif
// Enumerate the rules in a way that cares about the order of the
// rules.
void FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc,
RuleProcessorData* aData);
// Enumerate all the rules in a way that doesn't care about the order
// of the rules and break out if the enumeration is halted.
void WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc,
RuleProcessorData* aData);
already_AddRefed<nsStyleContext> GetContext(nsPresContext* aPresContext,
nsStyleContext* aParentContext,
nsIAtom* aPseudoTag);
nsPresContext* PresContext() { return mRuleTree->GetPresContext(); }
// The sheets in each array in mSheets are stored with the most significant
// sheet last.
nsCOMArray<nsIStyleSheet> mSheets[eSheetTypeCount];
nsCOMPtr<nsIStyleRuleProcessor> mRuleProcessors[eSheetTypeCount];
// cached instance for enabling/disabling
nsCOMPtr<nsIStyleSheet> mQuirkStyleSheet;
nsRefPtr<nsBindingManager> mBindingManager;
// To be used only in case of emergency, such as being out of memory
// or operating on a deleted rule node. The latter should never
// happen, of course.
nsCachedStyleData mDefaultStyleData;
nsRuleNode* mRuleTree; // This is the root of our rule tree. It is a
// lexicographic tree of matched rules that style
// contexts use to look up properties.
nsRuleWalker* mRuleWalker; // This is an instance of a rule walker that can
// be used to navigate through our tree.
PRInt32 mDestroyedCount; // used to batch style context GC
nsTArray<nsStyleContext*> mRoots; // style contexts with no parent
// Empty style rules to force things that restrict which properties
// apply into different branches of the rule tree.
nsRefPtr<nsEmptyStyleRule> mFirstLineRule, mFirstLetterRule;
PRUint16 mBatching;
// Old rule trees, which should only be non-empty between
// BeginReconstruct and EndReconstruct, but in case of bugs that cause
// style contexts to exist too long, may last longer.
nsTArray<nsRuleNode*> mOldRuleTrees;
unsigned mInShutdown : 1;
unsigned mAuthorStyleDisabled: 1;
unsigned mInReconstruct : 1;
unsigned mDirty : 7; // one dirty bit is used per sheet type
};
#endif