gecko-dev/layout/style/Rule.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
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*
* 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/
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*
* 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.
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*
* 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) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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 ***** */
/* base class for all rule types in a CSS style sheet */
#ifndef mozilla_css_Rule_h___
#define mozilla_css_Rule_h___
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#include "nsIStyleRule.h"
#include "nsIDOMCSSRule.h"
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class nsIStyleSheet;
class nsCSSStyleSheet;
struct nsRuleData;
template<class T> struct already_AddRefed;
namespace mozilla {
namespace css {
class GroupRule;
#define DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
virtual void MapRuleInfoInto(nsRuleData* aRuleData);
#define DECL_STYLE_RULE_INHERIT \
DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
virtual nsIDOMCSSRule* GetDOMRule();
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class Rule : public nsIStyleRule {
protected:
Rule()
: mSheet(nsnull),
mParentRule(nsnull)
{
}
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Rule(const Rule& aCopy)
: mSheet(aCopy.mSheet),
mParentRule(aCopy.mParentRule)
{
}
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virtual ~Rule() {}
public:
// for implementing nsISupports
NS_IMETHOD_(nsrefcnt) AddRef();
NS_IMETHOD_(nsrefcnt) Release();
protected:
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
public:
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// The constants in this list must maintain the following invariants:
// If a rule of type N must appear before a rule of type M in stylesheets
// then N < M
// Note that nsCSSStyleSheet::RebuildChildList assumes that no other kinds of
// rules can come between two rules of type IMPORT_RULE.
enum {
UNKNOWN_RULE = 0,
CHARSET_RULE,
IMPORT_RULE,
NAMESPACE_RULE,
STYLE_RULE,
MEDIA_RULE,
FONT_FACE_RULE,
PAGE_RULE,
KEYFRAME_RULE,
KEYFRAMES_RULE,
DOCUMENT_RULE
};
virtual PRInt32 GetType() const = 0;
nsCSSStyleSheet* GetStyleSheet() const { return mSheet; }
virtual void SetStyleSheet(nsCSSStyleSheet* aSheet);
void SetParentRule(GroupRule* aRule) {
// We don't reference count this up reference. The group rule
// will tell us when it's going away or when we're detached from
// it.
mParentRule = aRule;
}
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/**
* Clones |this|. Never returns NULL.
*/
virtual already_AddRefed<Rule> Clone() const = 0;
// Note that this returns null for inline style rules since they aren't
// supposed to have a DOM rule representation (and our code wouldn't work).
virtual nsIDOMCSSRule* GetDOMRule() = 0;
// to implement methods on nsIDOMCSSRule
nsresult GetParentRule(nsIDOMCSSRule** aParentRule);
nsresult GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet);
// This is pure virtual because all of Rule's data members are non-owning and
// thus measured elsewhere.
virtual NS_MUST_OVERRIDE size_t
SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const = 0;
// This is used to measure nsCOMArray<Rule>s.
static size_t SizeOfCOMArrayElementIncludingThis(css::Rule* aElement,
nsMallocSizeOfFun aMallocSizeOf,
void* aData);
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protected:
nsCSSStyleSheet* mSheet;
GroupRule* mParentRule;
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};
} // namespace css
} // namespace mozilla
#endif /* mozilla_css_Rule_h___ */