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/* -*- 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 License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* 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 Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "nsFrameList.h"
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void
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nsFrameList::DeleteFrames(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->DeleteFrame(aPresContext);
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delete frame;
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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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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::DeleteFrame(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->DeleteFrame(aPresContext);
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delete aFrame;
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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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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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nsFrameList tmp(aFrameList);
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nsIFrame* lastNewFrame = tmp.LastChild();
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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::ReplaceAndDeleteFrame(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->DeleteFrame(aPresContext);
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delete aNewFrame;
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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(aAfterFrame != mFirstChild, "bad split");
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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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(aAfterFrame != mFirstChild)) {
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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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PRBool
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nsFrameList::PullFrame(nsIFrame* aParent,
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nsFrameList& aFromList,
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nsIFrame** aResult)
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{
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NS_PRECONDITION(nsnull != aResult, "null ptr");
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if (nsnull != aResult) {
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nsIFrame* pulledFrame = aFromList.FirstChild();
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if (nsnull != pulledFrame) {
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aFromList.RemoveFrame(pulledFrame);
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AppendFrame(aParent, pulledFrame);
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return PR_TRUE;
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}
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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::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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PRBool
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nsFrameList::ContainsFrame(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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@ -0,0 +1,103 @@
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/* -*- 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 License
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||||
* Version 1.0 (the "License"); you may not use this file except in
|
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
|
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
|
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* the License for the specific language governing rights and limitations
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* 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 Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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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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}
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~nsFrameList() {
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}
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void DeleteFrames(nsIPresContext& aPresContext);
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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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}
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void AppendFrame(nsIFrame* aParent, nsIFrame* aFrame);
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PRBool RemoveFrame(nsIFrame* aFrame);
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PRBool DeleteFrame(nsIPresContext& 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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PRBool ReplaceFrame(nsIFrame* aParent,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame);
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PRBool ReplaceAndDeleteFrame(nsIPresContext& aPresContext,
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nsIFrame* aParent,
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nsIFrame* aOldFrame,
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nsIFrame* aNewFrame);
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PRBool Split(nsIFrame* aAfterFrame, nsIFrame** aNextFrameResult);
|
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PRBool PullFrame(nsIFrame* aParent,
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nsFrameList& aFromList,
|
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nsIFrame** aResult);
|
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void Join(nsIFrame* aParent, nsFrameList& aList) {
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AppendFrames(aParent, aList.mFirstChild);
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aList.mFirstChild = nsnull;
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}
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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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PRBool IsEmpty() const {
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return nsnull == mFirstChild;
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}
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PRBool ContainsFrame(nsIFrame* aFrame) const;
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PRInt32 GetLength() const;
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nsIFrame* GetPrevSiblingFor(nsIFrame* aFrame) const;
|
||||
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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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