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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 Communicator client 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):
*
* 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 ***** */
#ifndef nsFrameList_h___
#define nsFrameList_h___
#include "nsIFrame.h"
/**
* A class for managing a singly linked list of frames. Frames are
* linked together through their next-sibling pointer.
*/
class nsFrameList {
public:
nsFrameList() {
mFirstChild = nsnull;
}
nsFrameList(nsIFrame* aHead) {
mFirstChild = aHead;
#ifdef DEBUG
CheckForLoops();
#endif
}
~nsFrameList() {
}
void DestroyFrames(nsPresContext* aPresContext);
void SetFrames(nsIFrame* aFrameList) {
mFirstChild = aFrameList;
#ifdef DEBUG
CheckForLoops();
#endif
}
void AppendFrames(nsIFrame* aParent, nsIFrame* aFrameList);
void AppendFrames(nsIFrame* aParent, nsFrameList& aFrameList) {
AppendFrames(aParent, aFrameList.mFirstChild);
aFrameList.mFirstChild = nsnull;
}
void AppendFrame(nsIFrame* aParent, nsIFrame* aFrame);
// Take aFrame out of the frame list. This also disconnects aFrame
// from the sibling list. This will return PR_FALSE if aFrame is
// nsnull or if aFrame is not in the list. The second frame is
// a hint for the prev-sibling of aFrame; if the hint is correct,
// then this is O(1) time.
PRBool RemoveFrame(nsIFrame* aFrame, nsIFrame* aPrevSiblingHint = nsnull);
// Remove the first child from the list. The caller is assumed to be
// holding a reference to the first child. This call is equivalent
// in behavior to calling RemoveFrame(FirstChild()).
PRBool RemoveFirstChild();
// Take aFrame out of the frame list and then destroy it. This also
// disconnects aFrame from the sibling list. This will return
// PR_FALSE if aFrame is nsnull or if aFrame is not in the list.
PRBool DestroyFrame(nsPresContext* aPresContext, nsIFrame* aFrame);
void InsertFrame(nsIFrame* aParent,
nsIFrame* aPrevSibling,
nsIFrame* aNewFrame);
void InsertFrames(nsIFrame* aParent,
nsIFrame* aPrevSibling,
nsIFrame* aFrameList);
void InsertFrames(nsIFrame* aParent, nsIFrame* aPrevSibling,
nsFrameList& aFrameList) {
InsertFrames(aParent, aPrevSibling, aFrameList.FirstChild());
aFrameList.mFirstChild = nsnull;
}
PRBool ReplaceFrame(nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame,
PRBool aDestroy);
PRBool Split(nsIFrame* aAfterFrame, nsIFrame** aNextFrameResult);
/**
* Sort the frames according to content order so that the first
* frame in the list is the first in content order. Frames for
* the same content will be ordered so that a prev in flow
* comes before its next in flow.
*/
void SortByContentOrder();
nsIFrame* FirstChild() const {
return mFirstChild;
}
nsIFrame* LastChild() const;
nsIFrame* FrameAt(PRInt32 aIndex) const;
PRBool IsEmpty() const {
return nsnull == mFirstChild;
}
PRBool NotEmpty() const {
return nsnull != mFirstChild;
}
PRBool ContainsFrame(const nsIFrame* aFrame) const;
PRInt32 GetLength() const;
nsIFrame* GetPrevSiblingFor(nsIFrame* aFrame) const;
#ifdef IBMBIDI
/**
* Return the frame before this frame in visual order (after Bidi reordering)
*/
nsIFrame* GetPrevVisualFor(nsIFrame* aFrame) const;
/**
* Return the frame after this frame in visual order (after Bidi reordering)
*/
nsIFrame* GetNextVisualFor(nsIFrame* aFrame) const;
#endif // IBMBIDI
void VerifyParent(nsIFrame* aParent) const;
#ifdef NS_DEBUG
void List(nsPresContext* aPresContext, FILE* out) const;
#endif
private:
PRBool DoReplaceFrame(nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame);
#ifdef DEBUG
void CheckForLoops();
#endif
protected:
nsIFrame* mFirstChild;
};
#endif /* nsFrameList_h___ */
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