gecko-dev/layout/base/nsGenConList.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
* Esben Mose Hansen.
*
* Contributor(s):
* Esben Mose Hansen <esben@oek.dk> (original author)
* L. David Baron <dbaron@dbaron.org>
*
* 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 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 nsCounterList and nsQuoteList */
#ifndef nsGenConList_h___
#define nsGenConList_h___
#include "nsIFrame.h"
#include "nsStyleStruct.h"
#include "prclist.h"
#include "nsIDOMCharacterData.h"
#include "nsCSSPseudoElements.h"
class nsGenConList;
struct nsGenConNode : public PRCList {
// The wrapper frame for all of the pseudo-element's content. This
// frame generally has useful style data and has the
// NS_FRAME_GENERATED_CONTENT bit set (so we use it to track removal),
// but does not necessarily for |nsCounterChangeNode|s.
nsIFrame* mPseudoFrame;
// Index within the list of things specified by the 'content' property,
// which is needed to do 'content: open-quote open-quote' correctly,
// and needed for similar cases for counters.
const PRInt32 mContentIndex;
// null for 'content:no-open-quote', 'content:no-close-quote' and for
// counter nodes for increments and resets (rather than uses)
nsCOMPtr<nsIDOMCharacterData> mText;
nsGenConNode(PRInt32 aContentIndex)
: mPseudoFrame(nsnull)
, mContentIndex(aContentIndex)
{
}
/**
* Finish initializing the generated content node once we know the
* relevant text frame. This must be called just after
* the textframe has been initialized. This need not be called at all
* for nodes that don't generate text. This will generally set the
* mPseudoFrame, insert the node into aList, and set aTextFrame up
* with the correct text.
* @param aList the list the node belongs to
* @param aPseudoFrame the :before or :after frame
* @param aTextFrame the textframe where the node contents will render
* @return true iff this marked the list dirty
*/
virtual bool InitTextFrame(nsGenConList* aList, nsIFrame* aPseudoFrame,
nsIFrame* aTextFrame)
{
mPseudoFrame = aPseudoFrame;
CheckFrameAssertions();
return false;
}
virtual ~nsGenConNode() {} // XXX Avoid, perhaps?
protected:
void CheckFrameAssertions() {
NS_ASSERTION(mContentIndex <
PRInt32(mPseudoFrame->GetStyleContent()->ContentCount()),
"index out of range");
// We allow negative values of mContentIndex for 'counter-reset' and
// 'counter-increment'.
NS_ASSERTION(mContentIndex < 0 ||
mPseudoFrame->GetStyleContext()->GetPseudo() ==
nsCSSPseudoElements::before ||
mPseudoFrame->GetStyleContext()->GetPseudo() ==
nsCSSPseudoElements::after,
"not :before/:after generated content and not counter change");
NS_ASSERTION(mContentIndex < 0 ||
mPseudoFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT,
"not generated content and not counter change");
}
};
class nsGenConList {
protected:
nsGenConNode* mFirstNode;
PRUint32 mSize;
public:
nsGenConList() : mFirstNode(nsnull), mSize(0) {}
~nsGenConList() { Clear(); }
void Clear();
static nsGenConNode* Next(nsGenConNode* aNode) {
return static_cast<nsGenConNode*>(PR_NEXT_LINK(aNode));
}
static nsGenConNode* Prev(nsGenConNode* aNode) {
return static_cast<nsGenConNode*>(PR_PREV_LINK(aNode));
}
void Insert(nsGenConNode* aNode);
// returns whether any nodes have been destroyed
bool DestroyNodesFor(nsIFrame* aFrame); //destroy all nodes with aFrame as parent
// Return true if |aNode1| is after |aNode2|.
static bool NodeAfter(const nsGenConNode* aNode1,
const nsGenConNode* aNode2);
void Remove(nsGenConNode* aNode) { PR_REMOVE_LINK(aNode); mSize--; }
bool IsLast(nsGenConNode* aNode) { return (Next(aNode) == mFirstNode); }
};
#endif /* nsGenConList_h___ */