gecko-dev/layout/generic/nsFrameList.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
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*
* 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/
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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 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 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 ***** */
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#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;
}
~nsFrameList() {
}
void DestroyFrames(nsIPresContext* aPresContext);
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void SetFrames(nsIFrame* aFrameList) {
mFirstChild = aFrameList;
}
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void AppendFrames(nsIFrame* aParent, nsIFrame* aFrameList);
void AppendFrames(nsIFrame* aParent, nsFrameList& aFrameList) {
AppendFrames(aParent, aFrameList.mFirstChild);
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aFrameList.mFirstChild = nsnull;
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}
void AppendFrame(nsIFrame* aParent, nsIFrame* aFrame);
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// 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.
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PRBool RemoveFrame(nsIFrame* aFrame);
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// 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
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// 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(nsIPresContext* aPresContext, nsIFrame* aFrame);
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void InsertFrame(nsIFrame* aParent,
nsIFrame* aPrevSibling,
nsIFrame* aNewFrame);
void InsertFrames(nsIFrame* aParent,
nsIFrame* aPrevSibling,
nsIFrame* aFrameList);
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void InsertFrames(nsIFrame* aParent, nsIFrame* aPrevSibling,
nsFrameList& aFrameList) {
InsertFrames(aParent, aPrevSibling, aFrameList.FirstChild());
aFrameList.mFirstChild = nsnull;
}
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PRBool ReplaceFrame(nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame);
PRBool ReplaceAndDestroyFrame(nsIPresContext* aPresContext,
nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame);
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PRBool Split(nsIFrame* aAfterFrame, nsIFrame** aNextFrameResult);
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nsIFrame* PullFrame(nsIFrame* aParent,
nsIFrame* aLastChild,
nsFrameList& aFromList);
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nsIFrame* FirstChild() const {
return mFirstChild;
}
nsIFrame* LastChild() const;
nsIFrame* FrameAt(PRInt32 aIndex) const;
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PRBool IsEmpty() const {
return nsnull == mFirstChild;
}
PRBool NotEmpty() const {
return nsnull != mFirstChild;
}
PRBool ContainsFrame(const nsIFrame* aFrame) const;
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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
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void VerifyParent(nsIFrame* aParent) const;
#ifdef NS_DEBUG
void List(nsIPresContext* aPresContext, FILE* out) const;
#endif
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protected:
nsIFrame* mFirstChild;
};
#endif /* nsFrameList_h___ */