gecko-dev/layout/style/nsStyleContext.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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):
* David Hyatt <hyatt@netscape.com>
* Pierre Phaneuf <pp@ludusdesign.com>
*
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef _nsStyleContext_h_
#define _nsStyleContext_h_
#include "nsRuleNode.h"
class nsIPresContext;
class nsIAtom;
class nsStyleContext
{
public:
nsStyleContext(nsStyleContext* aParent, nsIAtom* aPseudoTag,
nsRuleNode* aRuleNode, nsIPresContext* aPresContext);
~nsStyleContext();
void* operator new(size_t sz, nsIPresContext* aPresContext) CPP_THROW_NEW;
void Destroy();
nsrefcnt AddRef() {
++mRefCnt;
NS_LOG_ADDREF(this, mRefCnt, "nsStyleContext", sizeof(nsStyleContext));
return mRefCnt;
}
nsrefcnt Release() {
--mRefCnt;
NS_LOG_RELEASE(this, mRefCnt, "nsStyleContext");
if (mRefCnt == 0) {
Destroy();
return 0;
}
return mRefCnt;
}
nsStyleContext* GetParent() const { return mParent; }
nsStyleContext* GetFirstChild() const { return mChild; }
nsIAtom* GetPseudoType() const { return mPseudoTag; }
already_AddRefed<nsStyleContext>
FindChildWithRules(const nsIAtom* aPseudoTag, nsRuleNode* aRules);
PRBool Equals(const nsStyleContext* aOther) const;
PRBool HasTextDecorations() { return mBits & NS_STYLE_HAS_TEXT_DECORATIONS; };
void GetBorderPaddingFor(nsStyleBorderPadding& aBorderPadding);
void SetStyle(nsStyleStructID aSID, nsStyleStruct* aStruct);
nsRuleNode* GetRuleNode() { return mRuleNode; }
void AddStyleBit(const PRUint32& aBit) { mBits |= aBit; }
void GetStyleBits(PRUint32* aBits) { *aBits = mBits; }
/*
* Mark this style context's rule node (and its ancestors) to prevent
* it from being garbage collected.
*/
void Mark();
/*
* Get the style data for a style struct. This is the most important
* member function of nsIStyleContext. It fills in a const pointer
* to a style data struct that is appropriate for the style context's
* frame. This struct may be shared with other contexts (either in
* the rule tree or the style context tree), so it should not be
* modified.
*
* This function will NOT return null (even when out of memory) when
* given a valid style struct ID, so the result does not need to be
* null-checked.
*
* The typesafe functions below are preferred to the use of this
* function.
*
* See also |nsIFrame::GetStyleData| and the other global
* |GetStyleData| in nsIFrame.h.
*/
const nsStyleStruct* GetStyleData(nsStyleStructID aSID);
/**
* Define typesafe getter functions for each style struct by
* preprocessing the list of style structs. These functions are the
* preferred way to get style data. The macro creates functions like:
* const nsStyleBorder* GetStyleBorder();
* const nsStyleColor* GetStyleColor();
*/
#define STYLE_STRUCT(name_, checkdata_cb_, ctor_args_) \
const nsStyle##name_ * GetStyle##name_() { \
return NS_STATIC_CAST(const nsStyle##name_*, \
GetStyleData(eStyleStruct_##name_)); \
}
#include "nsStyleStructList.h"
#undef STYLE_STRUCT
const nsStyleStruct* PeekStyleData(nsStyleStructID aSID);
nsStyleStruct* GetUniqueStyleData(nsIPresContext* aPresContext, const nsStyleStructID& aSID);
void ClearStyleData(nsIPresContext* aPresContext);
nsChangeHint CalcStyleDifference(nsStyleContext* aOther);
#ifdef DEBUG
void DumpRegressionData(nsIPresContext* aPresContext, FILE* out, PRInt32 aIndent);
void List(FILE* out, PRInt32 aIndent);
#endif
protected:
void AppendChild(nsStyleContext* aChild);
void RemoveChild(nsStyleContext* aChild);
void ApplyStyleFixups(nsIPresContext* aPresContext);
nsStyleContext* mParent;
nsStyleContext* mChild;
nsStyleContext* mEmptyChild;
nsStyleContext* mPrevSibling;
nsStyleContext* mNextSibling;
// If this style context is for a pseudo-element, the pseudo-element
// atom. Otherwise, null.
nsCOMPtr<nsIAtom> mPseudoTag;
nsRuleNode* mRuleNode;
// |mCachedStyleData| points to both structs that are owned by this
// style context and structs that are owned by one of this style
// context's ancestors (which are indirectly owned since this style
// context owns a reference to its parent). If the bit in |mBits| is
// set for a struct, that means that the pointer for that struct is
// owned by an ancestor rather than by this style context.
nsCachedStyleData mCachedStyleData; // Our cached style data.
PRUint32 mBits; // Which structs are inherited from the
// parent context.
PRUint32 mRefCnt;
};
already_AddRefed<nsStyleContext>
NS_NewStyleContext(nsStyleContext* aParentContext,
nsIAtom* aPseudoTag,
nsRuleNode* aRuleNode,
nsIPresContext* aPresContext);
#endif