gecko/layout/style/nsCSSStyleSheet.h
2011-10-28 08:35:45 +01:00

322 lines
11 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>
* Pierre Phaneuf <pp@ludusdesign.com>
* Daniel Glazman <glazman@netscape.com>
*
* 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 ***** */
/* representation of a CSS style sheet */
#ifndef nsCSSStyleSheet_h_
#define nsCSSStyleSheet_h_
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsIStyleSheet.h"
#include "nsIDOMCSSStyleSheet.h"
#include "nsICSSLoaderObserver.h"
#include "nsCOMArray.h"
#include "nsTArray.h"
#include "nsString.h"
class nsXMLNameSpaceMap;
class nsCSSRuleProcessor;
class nsMediaList;
class nsIPrincipal;
class nsIURI;
class nsMediaList;
class nsMediaQueryResultCacheKey;
class nsCSSStyleSheet;
class nsPresContext;
template<class E, class A> class nsTArray;
namespace mozilla {
namespace css {
class Rule;
class GroupRule;
class ImportRule;
}
}
// -------------------------------
// CSS Style Sheet Inner Data Container
//
class nsCSSStyleSheetInner {
public:
friend class nsCSSStyleSheet;
friend class nsCSSRuleProcessor;
friend nsresult NS_NewCSSStyleSheet(nsCSSStyleSheet** aInstancePtrResult);
private:
nsCSSStyleSheetInner(nsCSSStyleSheet* aPrimarySheet);
nsCSSStyleSheetInner(nsCSSStyleSheetInner& aCopy,
nsCSSStyleSheet* aPrimarySheet);
~nsCSSStyleSheetInner();
nsCSSStyleSheetInner* CloneFor(nsCSSStyleSheet* aPrimarySheet);
void AddSheet(nsCSSStyleSheet* aSheet);
void RemoveSheet(nsCSSStyleSheet* aSheet);
void RebuildNameSpaces();
// Create a new namespace map
nsresult CreateNamespaceMap();
nsAutoTArray<nsCSSStyleSheet*, 8> mSheets;
nsCOMPtr<nsIURI> mSheetURI; // for error reports, etc.
nsCOMPtr<nsIURI> mOriginalSheetURI; // for GetHref. Can be null.
nsCOMPtr<nsIURI> mBaseURI; // for resolving relative URIs
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCOMArray<mozilla::css::Rule> mOrderedRules;
nsAutoPtr<nsXMLNameSpaceMap> mNameSpaceMap;
// Linked list of child sheets. This is al fundamentally broken, because
// each of the child sheets has a unique parent... We can only hope (and
// currently this is the case) that any time page JS can get ts hands on a
// child sheet that means we've already ensured unique inners throughout its
// parent chain and things are good.
nsRefPtr<nsCSSStyleSheet> mFirstChild;
bool mComplete;
#ifdef DEBUG
bool mPrincipalSet;
#endif
};
// -------------------------------
// CSS Style Sheet
//
class CSSRuleListImpl;
struct ChildSheetListBuilder;
// CID for the nsCSSStyleSheet class
// ca926f30-2a7e-477e-8467-803fb32af20a
#define NS_CSS_STYLE_SHEET_IMPL_CID \
{ 0xca926f30, 0x2a7e, 0x477e, \
{ 0x84, 0x67, 0x80, 0x3f, 0xb3, 0x2a, 0xf2, 0x0a } }
class NS_FINAL_CLASS nsCSSStyleSheet : public nsIStyleSheet,
public nsIDOMCSSStyleSheet,
public nsICSSLoaderObserver
{
public:
nsCSSStyleSheet();
NS_DECL_ISUPPORTS
NS_DECLARE_STATIC_IID_ACCESSOR(NS_CSS_STYLE_SHEET_IMPL_CID)
// nsIStyleSheet interface
virtual nsIURI* GetSheetURI() const;
virtual nsIURI* GetBaseURI() const;
virtual void GetTitle(nsString& aTitle) const;
virtual void GetType(nsString& aType) const;
virtual bool HasRules() const;
virtual bool IsApplicable() const;
virtual void SetEnabled(bool aEnabled);
virtual bool IsComplete() const;
virtual void SetComplete();
virtual nsIStyleSheet* GetParentSheet() const; // may be null
virtual nsIDocument* GetOwningDocument() const; // may be null
virtual void SetOwningDocument(nsIDocument* aDocument);
// Find the ID of the owner inner window.
PRUint64 FindOwningWindowInnerID() const;
#ifdef DEBUG
virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
#endif
void AppendStyleSheet(nsCSSStyleSheet* aSheet);
void InsertStyleSheetAt(nsCSSStyleSheet* aSheet, PRInt32 aIndex);
// XXX do these belong here or are they generic?
void PrependStyleRule(mozilla::css::Rule* aRule);
void AppendStyleRule(mozilla::css::Rule* aRule);
void ReplaceStyleRule(mozilla::css::Rule* aOld, mozilla::css::Rule* aNew);
PRInt32 StyleRuleCount() const;
nsresult GetStyleRuleAt(PRInt32 aIndex, mozilla::css::Rule*& aRule) const;
nsresult DeleteRuleFromGroup(mozilla::css::GroupRule* aGroup, PRUint32 aIndex);
nsresult InsertRuleIntoGroup(const nsAString& aRule, mozilla::css::GroupRule* aGroup, PRUint32 aIndex, PRUint32* _retval);
nsresult ReplaceRuleInGroup(mozilla::css::GroupRule* aGroup, mozilla::css::Rule* aOld, mozilla::css::Rule* aNew);
PRInt32 StyleSheetCount() const;
/**
* SetURIs must be called on all sheets before parsing into them.
* SetURIs may only be called while the sheet is 1) incomplete and 2)
* has no rules in it
*/
void SetURIs(nsIURI* aSheetURI, nsIURI* aOriginalSheetURI, nsIURI* aBaseURI);
/**
* SetPrincipal should be called on all sheets before parsing into them.
* This can only be called once with a non-null principal. Calling this with
* a null pointer is allowed and is treated as a no-op.
*/
void SetPrincipal(nsIPrincipal* aPrincipal);
// Principal() never returns a null pointer.
nsIPrincipal* Principal() const { return mInner->mPrincipal; }
void SetTitle(const nsAString& aTitle) { mTitle = aTitle; }
void SetMedia(nsMediaList* aMedia);
void SetOwningNode(nsIDOMNode* aOwningNode) { mOwningNode = aOwningNode; /* Not ref counted */ }
void SetOwnerRule(mozilla::css::ImportRule* aOwnerRule) { mOwnerRule = aOwnerRule; /* Not ref counted */ }
mozilla::css::ImportRule* GetOwnerRule() const { return mOwnerRule; }
nsXMLNameSpaceMap* GetNameSpaceMap() const { return mInner->mNameSpaceMap; }
already_AddRefed<nsCSSStyleSheet> Clone(nsCSSStyleSheet* aCloneParent,
mozilla::css::ImportRule* aCloneOwnerRule,
nsIDocument* aCloneDocument,
nsIDOMNode* aCloneOwningNode) const;
bool IsModified() const { return mDirty; }
void SetModifiedByChildRule() {
NS_ASSERTION(mDirty,
"sheet must be marked dirty before handing out child rules");
DidDirty();
}
nsresult AddRuleProcessor(nsCSSRuleProcessor* aProcessor);
nsresult DropRuleProcessor(nsCSSRuleProcessor* aProcessor);
/**
* Like the DOM insertRule() method, but doesn't do any security checks
*/
nsresult InsertRuleInternal(const nsAString& aRule,
PRUint32 aIndex, PRUint32* aReturn);
/* Get the URI this sheet was originally loaded from, if any. Can
return null */
virtual nsIURI* GetOriginalURI() const;
// nsICSSLoaderObserver interface
NS_IMETHOD StyleSheetLoaded(nsCSSStyleSheet* aSheet, bool aWasAlternate,
nsresult aStatus);
enum EnsureUniqueInnerResult {
// No work was needed to ensure a unique inner.
eUniqueInner_AlreadyUnique,
// A clone was done to ensure a unique inner (which means the style
// rules in this sheet have changed).
eUniqueInner_ClonedInner,
// A clone was attempted, but it failed.
eUniqueInner_CloneFailed
};
EnsureUniqueInnerResult EnsureUniqueInner();
// Append all of this sheet's child sheets to aArray. Return true
// on success and false on allocation failure.
bool AppendAllChildSheets(nsTArray<nsCSSStyleSheet*>& aArray);
bool UseForPresentation(nsPresContext* aPresContext,
nsMediaQueryResultCacheKey& aKey) const;
// nsIDOMStyleSheet interface
NS_DECL_NSIDOMSTYLESHEET
// nsIDOMCSSStyleSheet interface
NS_DECL_NSIDOMCSSSTYLESHEET
// Function used as a callback to rebuild our inner's child sheet
// list after we clone a unique inner for ourselves.
static bool RebuildChildList(mozilla::css::Rule* aRule, void* aBuilder);
private:
nsCSSStyleSheet(const nsCSSStyleSheet& aCopy,
nsCSSStyleSheet* aParentToUse,
mozilla::css::ImportRule* aOwnerRuleToUse,
nsIDocument* aDocumentToUse,
nsIDOMNode* aOwningNodeToUse);
// These are not supported and are not implemented!
nsCSSStyleSheet(const nsCSSStyleSheet& aCopy);
nsCSSStyleSheet& operator=(const nsCSSStyleSheet& aCopy);
protected:
virtual ~nsCSSStyleSheet();
void ClearRuleCascades();
nsresult WillDirty();
void DidDirty();
// Return success if the subject principal subsumes the principal of our
// inner, error otherwise. This will also succeed if the subject has
// UniversalBrowserWrite.
nsresult SubjectSubsumesInnerPrincipal() const;
// Add the namespace mapping from this @namespace rule to our namespace map
nsresult RegisterNamespaceRule(mozilla::css::Rule* aRule);
protected:
nsString mTitle;
nsRefPtr<nsMediaList> mMedia;
nsRefPtr<nsCSSStyleSheet> mNext;
nsCSSStyleSheet* mParent; // weak ref
mozilla::css::ImportRule* mOwnerRule; // weak ref
CSSRuleListImpl* mRuleCollection;
nsIDocument* mDocument; // weak ref; parents maintain this for their children
nsIDOMNode* mOwningNode; // weak ref
bool mDisabled;
bool mDirty; // has been modified
nsCSSStyleSheetInner* mInner;
nsAutoTArray<nsCSSRuleProcessor*, 8>* mRuleProcessors;
friend class nsMediaList;
friend class nsCSSRuleProcessor;
friend nsresult NS_NewCSSStyleSheet(nsCSSStyleSheet** aInstancePtrResult);
friend struct ChildSheetListBuilder;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsCSSStyleSheet, NS_CSS_STYLE_SHEET_IMPL_CID)
nsresult NS_NewCSSStyleSheet(nsCSSStyleSheet** aInstancePtrResult);
#endif /* !defined(nsCSSStyleSheet_h_) */