mirror of
https://github.com/mozilla/gecko-dev.git
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184 lines
5.6 KiB
C++
184 lines
5.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsFrameList_h___
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#define nsFrameList_h___
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#include "nsIFrame.h"
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/**
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* A class for managing a singly linked list of frames. Frames are
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* linked together through their next-sibling pointer.
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*/
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class nsFrameList {
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public:
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nsFrameList() {
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mFirstChild = nsnull;
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}
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nsFrameList(nsIFrame* aHead) {
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mFirstChild = aHead;
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#ifdef DEBUG
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CheckForLoops();
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#endif
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}
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~nsFrameList() {
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}
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void DestroyFrames(nsPresContext* aPresContext);
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void SetFrames(nsIFrame* aFrameList) {
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mFirstChild = aFrameList;
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#ifdef DEBUG
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CheckForLoops();
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#endif
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}
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void AppendFrames(nsIFrame* aParent, nsIFrame* aFrameList);
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void AppendFrames(nsIFrame* aParent, nsFrameList& aFrameList) {
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AppendFrames(aParent, aFrameList.mFirstChild);
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aFrameList.mFirstChild = nsnull;
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}
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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
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// from the sibling list. This will return PR_FALSE if aFrame is
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// nsnull or if aFrame is not in the list. The second frame is
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// a hint for the prev-sibling of aFrame; if the hint is correct,
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// then this is O(1) time.
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PRBool RemoveFrame(nsIFrame* aFrame, nsIFrame* aPrevSiblingHint = nsnull);
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// Remove the first child from the list. The caller is assumed to be
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// holding a reference to the first child. This call is equivalent
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// in behavior to calling RemoveFrame(FirstChild()).
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PRBool RemoveFirstChild();
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// 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
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// PR_FALSE if aFrame is nsnull or if aFrame is not in the list.
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PRBool DestroyFrame(nsPresContext* aPresContext, nsIFrame* aFrame);
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void InsertFrame(nsIFrame* aParent,
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nsIFrame* aPrevSibling,
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nsIFrame* aNewFrame);
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void InsertFrames(nsIFrame* aParent,
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nsIFrame* aPrevSibling,
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nsIFrame* aFrameList);
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void InsertFrames(nsIFrame* aParent, nsIFrame* aPrevSibling,
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nsFrameList& aFrameList) {
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InsertFrames(aParent, aPrevSibling, aFrameList.FirstChild());
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aFrameList.mFirstChild = nsnull;
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}
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PRBool ReplaceFrame(nsIFrame* aParent,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame,
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PRBool aDestroy);
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PRBool Split(nsIFrame* aAfterFrame, nsIFrame** aNextFrameResult);
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/**
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* Sort the frames according to content order so that the first
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* frame in the list is the first in content order. Frames for
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* the same content will be ordered so that a prev in flow
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* comes before its next in flow.
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*/
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void SortByContentOrder();
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nsIFrame* PullFrame(nsIFrame* aParent,
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nsIFrame* aLastChild,
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nsFrameList& aFromList);
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nsIFrame* FirstChild() const {
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return mFirstChild;
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}
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nsIFrame* LastChild() const;
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nsIFrame* FrameAt(PRInt32 aIndex) const;
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PRBool IsEmpty() const {
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return nsnull == mFirstChild;
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}
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PRBool NotEmpty() const {
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return nsnull != mFirstChild;
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}
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PRBool ContainsFrame(const nsIFrame* aFrame) const;
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PRInt32 GetLength() const;
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nsIFrame* GetPrevSiblingFor(nsIFrame* aFrame) const;
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#ifdef IBMBIDI
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/**
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* Return the frame before this frame in visual order (after Bidi reordering)
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*/
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nsIFrame* GetPrevVisualFor(nsIFrame* aFrame) const;
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/**
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* Return the frame after this frame in visual order (after Bidi reordering)
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*/
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nsIFrame* GetNextVisualFor(nsIFrame* aFrame) const;
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#endif // IBMBIDI
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void VerifyParent(nsIFrame* aParent) const;
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#ifdef NS_DEBUG
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void List(nsPresContext* aPresContext, FILE* out) const;
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#endif
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private:
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PRBool DoReplaceFrame(nsIFrame* aParent,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame);
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#ifdef DEBUG
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void CheckForLoops();
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#endif
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protected:
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nsIFrame* mFirstChild;
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};
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#endif /* nsFrameList_h___ */
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