mirror of
https://github.com/mozilla/gecko-dev.git
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379 lines
9.2 KiB
C++
379 lines
9.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Pierre Phaneuf <pp@ludusdesign.com>
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*/
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#include "nsFrameList.h"
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#ifdef NS_DEBUG
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#include "nsIFrameDebug.h"
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#endif
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void
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nsFrameList::DestroyFrames(nsIPresContext* aPresContext)
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{
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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nsIFrame* next;
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frame->GetNextSibling(&next);
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frame->Destroy(aPresContext);
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mFirstChild = frame = next;
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}
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}
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void
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nsFrameList::AppendFrames(nsIFrame* aParent, nsIFrame* aFrameList)
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{
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NS_PRECONDITION(nsnull != aFrameList, "null ptr");
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if (nsnull != aFrameList) {
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nsIFrame* lastChild = LastChild();
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if (nsnull == lastChild) {
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mFirstChild = aFrameList;
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}
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else {
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lastChild->SetNextSibling(aFrameList);
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}
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if (nsnull != aParent) {
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nsIFrame* frame = aFrameList;
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while (nsnull != frame) {
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frame->SetParent(aParent);
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frame->GetNextSibling(&frame);
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}
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}
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}
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}
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void
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nsFrameList::AppendFrame(nsIFrame* aParent, nsIFrame* aFrame)
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{
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NS_PRECONDITION(nsnull != aFrame, "null ptr");
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if (nsnull != aFrame) {
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nsIFrame* lastChild = LastChild();
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if (nsnull == lastChild) {
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mFirstChild = aFrame;
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}
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else {
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lastChild->SetNextSibling(aFrame);
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}
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if (nsnull != aParent) {
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aFrame->SetParent(aParent);
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}
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}
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}
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PRBool
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nsFrameList::RemoveFrame(nsIFrame* aFrame)
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{
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NS_PRECONDITION(nsnull != aFrame, "null ptr");
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if (nsnull != aFrame) {
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nsIFrame* nextFrame;
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aFrame->GetNextSibling(&nextFrame);
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aFrame->SetNextSibling(nsnull);
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if (aFrame == mFirstChild) {
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mFirstChild = nextFrame;
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return PR_TRUE;
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}
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else {
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nsIFrame* prevSibling = GetPrevSiblingFor(aFrame);
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if (nsnull != prevSibling) {
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prevSibling->SetNextSibling(nextFrame);
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return PR_TRUE;
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}
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}
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}
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return PR_FALSE;
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}
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PRBool
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nsFrameList::RemoveFirstChild()
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{
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if (nsnull != mFirstChild) {
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nsIFrame* nextFrame;
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mFirstChild->GetNextSibling(&nextFrame);
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mFirstChild->SetNextSibling(nsnull);
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mFirstChild = nextFrame;
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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PRBool
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nsFrameList::DestroyFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(nsnull != aFrame, "null ptr");
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if (RemoveFrame(aFrame)) {
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aFrame->Destroy(aPresContext);
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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void
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nsFrameList::InsertFrame(nsIFrame* aParent,
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nsIFrame* aPrevSibling,
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nsIFrame* aNewFrame)
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{
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NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
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if (nsnull != aNewFrame) {
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if (nsnull == aPrevSibling) {
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aNewFrame->SetNextSibling(mFirstChild);
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mFirstChild = aNewFrame;
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}
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else {
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nsIFrame* nextFrame;
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aPrevSibling->GetNextSibling(&nextFrame);
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aPrevSibling->SetNextSibling(aNewFrame);
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aNewFrame->SetNextSibling(nextFrame);
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}
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if (nsnull != aParent) {
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aNewFrame->SetParent(aParent);
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}
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}
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}
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void
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nsFrameList::InsertFrames(nsIFrame* aParent,
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nsIFrame* aPrevSibling,
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nsIFrame* aFrameList)
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{
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NS_PRECONDITION(nsnull != aFrameList, "null ptr");
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if (nsnull != aFrameList) {
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nsIFrame* lastNewFrame = nsnull;
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if (nsnull != aParent) {
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nsIFrame* frame = aFrameList;
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while (nsnull != frame) {
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frame->SetParent(aParent);
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lastNewFrame = frame;
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frame->GetNextSibling(&frame);
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}
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}
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// Get the last new frame if necessary
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if (!lastNewFrame) {
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nsFrameList tmp(aFrameList);
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lastNewFrame = tmp.LastChild();
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}
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// Link the new frames into the child list
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if (nsnull == aPrevSibling) {
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lastNewFrame->SetNextSibling(mFirstChild);
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mFirstChild = aFrameList;
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}
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else {
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nsIFrame* nextFrame;
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aPrevSibling->GetNextSibling(&nextFrame);
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aPrevSibling->SetNextSibling(aFrameList);
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lastNewFrame->SetNextSibling(nextFrame);
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}
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}
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}
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PRBool
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nsFrameList::ReplaceFrame(nsIFrame* aParent,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame)
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{
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NS_PRECONDITION(nsnull != aOldFrame, "null ptr");
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NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
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if ((nsnull != aOldFrame) && (nsnull != aNewFrame)) {
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nsIFrame* nextFrame;
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aOldFrame->GetNextSibling(&nextFrame);
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if (aOldFrame == mFirstChild) {
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mFirstChild = aNewFrame;
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aNewFrame->SetNextSibling(nextFrame);
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}
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else {
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nsIFrame* prevSibling = GetPrevSiblingFor(aOldFrame);
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if (nsnull != prevSibling) {
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prevSibling->SetNextSibling(aNewFrame);
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aNewFrame->SetNextSibling(nextFrame);
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}
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}
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if (nsnull != aParent) {
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aNewFrame->SetParent(aParent);
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}
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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PRBool
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nsFrameList::ReplaceAndDestroyFrame(nsIPresContext* aPresContext,
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nsIFrame* aParent,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame)
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{
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NS_PRECONDITION(nsnull != aOldFrame, "null ptr");
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NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
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if (ReplaceFrame(aParent, aOldFrame, aNewFrame)) {
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aNewFrame->Destroy(aPresContext);
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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PRBool
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nsFrameList::Split(nsIFrame* aAfterFrame, nsIFrame** aNextFrameResult)
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{
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NS_PRECONDITION(nsnull != aAfterFrame, "null ptr");
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NS_PRECONDITION(nsnull != aNextFrameResult, "null ptr");
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NS_ASSERTION(ContainsFrame(aAfterFrame), "split after unknown frame");
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if ((nsnull != aNextFrameResult) && (nsnull != aAfterFrame)) {
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nsIFrame* nextFrame;
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aAfterFrame->GetNextSibling(&nextFrame);
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aAfterFrame->SetNextSibling(nsnull);
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*aNextFrameResult = nextFrame;
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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nsIFrame*
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nsFrameList::PullFrame(nsIFrame* aParent,
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nsIFrame* aLastChild,
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nsFrameList& aFromList)
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{
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NS_PRECONDITION(nsnull != aParent, "null ptr");
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nsIFrame* pulledFrame = nsnull;
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if (nsnull != aParent) {
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pulledFrame = aFromList.FirstChild();
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if (nsnull != pulledFrame) {
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// Take frame off old list
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aFromList.RemoveFirstChild();
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// Put it on the end of this list
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if (nsnull == aLastChild) {
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NS_ASSERTION(nsnull == mFirstChild, "bad aLastChild");
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mFirstChild = pulledFrame;
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}
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else {
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aLastChild->SetNextSibling(pulledFrame);
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}
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pulledFrame->SetParent(aParent);
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}
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}
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return pulledFrame;
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}
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nsIFrame*
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nsFrameList::LastChild() const
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{
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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nsIFrame* next;
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frame->GetNextSibling(&next);
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if (nsnull == next) {
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break;
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}
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frame = next;
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}
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return frame;
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}
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nsIFrame*
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nsFrameList::FrameAt(PRInt32 aIndex) const
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{
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NS_PRECONDITION(aIndex >= 0, "invalid arg");
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if (aIndex < 0) return nsnull;
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nsIFrame* frame = mFirstChild;
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while ((aIndex-- > 0) && (nsnull != frame)) {
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frame->GetNextSibling(&frame);
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}
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return frame;
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}
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PRBool
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nsFrameList::ContainsFrame(const nsIFrame* aFrame) const
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{
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NS_PRECONDITION(nsnull != aFrame, "null ptr");
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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if (frame == aFrame) {
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return PR_TRUE;
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}
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frame->GetNextSibling(&frame);
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}
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return PR_FALSE;
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}
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PRInt32
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nsFrameList::GetLength() const
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{
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PRInt32 count = 0;
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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count++;
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frame->GetNextSibling(&frame);
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}
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return count;
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}
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nsIFrame*
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nsFrameList::GetPrevSiblingFor(nsIFrame* aFrame) const
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{
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NS_PRECONDITION(nsnull != aFrame, "null ptr");
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if (aFrame == mFirstChild) {
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return nsnull;
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}
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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nsIFrame* next;
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frame->GetNextSibling(&next);
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if (next == aFrame) {
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break;
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}
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frame = next;
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}
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return frame;
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}
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void
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nsFrameList::VerifyParent(nsIFrame* aParent) const
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{
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#ifdef NS_DEBUG
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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nsIFrame* parent;
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frame->GetParent(&parent);
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NS_ASSERTION(parent == aParent, "bad parent");
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frame->GetNextSibling(&frame);
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}
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#endif
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}
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#ifdef NS_DEBUG
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void
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nsFrameList::List(nsIPresContext* aPresContext, FILE* out) const
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{
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fputs("<\n", out);
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nsIFrame* frame = mFirstChild;
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while (nsnull != frame) {
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nsIFrameDebug* frameDebug;
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if (NS_SUCCEEDED(frame->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
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frameDebug->List(aPresContext, out, 1);
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}
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frame->GetNextSibling(&frame);
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}
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fputs(">\n", out);
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}
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#endif
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