gecko-dev/layout/generic/nsFrameList.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
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*/
#include "nsFrameList.h"
#ifdef NS_DEBUG
#include "nsIFrameDebug.h"
#endif
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void
nsFrameList::DestroyFrames(nsIPresContext* aPresContext)
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{
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
nsIFrame* next;
frame->GetNextSibling(&next);
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frame->Destroy(aPresContext);
mFirstChild = frame = next;
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}
}
void
nsFrameList::AppendFrames(nsIFrame* aParent, nsIFrame* aFrameList)
{
NS_PRECONDITION(nsnull != aFrameList, "null ptr");
if (nsnull != aFrameList) {
nsIFrame* lastChild = LastChild();
if (nsnull == lastChild) {
mFirstChild = aFrameList;
}
else {
lastChild->SetNextSibling(aFrameList);
}
if (nsnull != aParent) {
nsIFrame* frame = aFrameList;
while (nsnull != frame) {
frame->SetParent(aParent);
frame->GetNextSibling(&frame);
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}
}
}
}
void
nsFrameList::AppendFrame(nsIFrame* aParent, nsIFrame* aFrame)
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
if (nsnull != aFrame) {
nsIFrame* lastChild = LastChild();
if (nsnull == lastChild) {
mFirstChild = aFrame;
}
else {
lastChild->SetNextSibling(aFrame);
}
if (nsnull != aParent) {
aFrame->SetParent(aParent);
}
}
}
PRBool
nsFrameList::RemoveFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
if (nsnull != aFrame) {
nsIFrame* nextFrame;
aFrame->GetNextSibling(&nextFrame);
aFrame->SetNextSibling(nsnull);
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if (aFrame == mFirstChild) {
mFirstChild = nextFrame;
return PR_TRUE;
}
else {
nsIFrame* prevSibling = GetPrevSiblingFor(aFrame);
if (nsnull != prevSibling) {
prevSibling->SetNextSibling(nextFrame);
return PR_TRUE;
}
}
}
return PR_FALSE;
}
PRBool
nsFrameList::RemoveFirstChild()
{
if (nsnull != mFirstChild) {
nsIFrame* nextFrame;
mFirstChild->GetNextSibling(&nextFrame);
mFirstChild->SetNextSibling(nsnull);
mFirstChild = nextFrame;
return PR_TRUE;
}
return PR_FALSE;
}
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PRBool
nsFrameList::DestroyFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
if (RemoveFrame(aFrame)) {
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aFrame->Destroy(aPresContext);
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return PR_TRUE;
}
return PR_FALSE;
}
void
nsFrameList::InsertFrame(nsIFrame* aParent,
nsIFrame* aPrevSibling,
nsIFrame* aNewFrame)
{
NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
if (nsnull != aNewFrame) {
if (nsnull == aPrevSibling) {
aNewFrame->SetNextSibling(mFirstChild);
mFirstChild = aNewFrame;
}
else {
nsIFrame* nextFrame;
aPrevSibling->GetNextSibling(&nextFrame);
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aPrevSibling->SetNextSibling(aNewFrame);
aNewFrame->SetNextSibling(nextFrame);
}
if (nsnull != aParent) {
aNewFrame->SetParent(aParent);
}
}
}
void
nsFrameList::InsertFrames(nsIFrame* aParent,
nsIFrame* aPrevSibling,
nsIFrame* aFrameList)
{
NS_PRECONDITION(nsnull != aFrameList, "null ptr");
if (nsnull != aFrameList) {
nsIFrame* lastNewFrame = nsnull;
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if (nsnull != aParent) {
nsIFrame* frame = aFrameList;
while (nsnull != frame) {
frame->SetParent(aParent);
lastNewFrame = frame;
frame->GetNextSibling(&frame);
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}
}
// Get the last new frame if necessary
if (!lastNewFrame) {
nsFrameList tmp(aFrameList);
lastNewFrame = tmp.LastChild();
}
// Link the new frames into the child list
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if (nsnull == aPrevSibling) {
lastNewFrame->SetNextSibling(mFirstChild);
mFirstChild = aFrameList;
}
else {
nsIFrame* nextFrame;
aPrevSibling->GetNextSibling(&nextFrame);
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aPrevSibling->SetNextSibling(aFrameList);
lastNewFrame->SetNextSibling(nextFrame);
}
}
}
PRBool
nsFrameList::ReplaceFrame(nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
NS_PRECONDITION(nsnull != aOldFrame, "null ptr");
NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
if ((nsnull != aOldFrame) && (nsnull != aNewFrame)) {
nsIFrame* nextFrame;
aOldFrame->GetNextSibling(&nextFrame);
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if (aOldFrame == mFirstChild) {
mFirstChild = aNewFrame;
aNewFrame->SetNextSibling(nextFrame);
}
else {
nsIFrame* prevSibling = GetPrevSiblingFor(aOldFrame);
if (nsnull != prevSibling) {
prevSibling->SetNextSibling(aNewFrame);
aNewFrame->SetNextSibling(nextFrame);
}
}
if (nsnull != aParent) {
aNewFrame->SetParent(aParent);
}
return PR_TRUE;
}
return PR_FALSE;
}
PRBool
nsFrameList::ReplaceAndDestroyFrame(nsIPresContext* aPresContext,
nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
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{
NS_PRECONDITION(nsnull != aOldFrame, "null ptr");
NS_PRECONDITION(nsnull != aNewFrame, "null ptr");
if (ReplaceFrame(aParent, aOldFrame, aNewFrame)) {
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aNewFrame->Destroy(aPresContext);
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return PR_TRUE;
}
return PR_FALSE;
}
PRBool
nsFrameList::Split(nsIFrame* aAfterFrame, nsIFrame** aNextFrameResult)
{
NS_PRECONDITION(nsnull != aAfterFrame, "null ptr");
NS_PRECONDITION(nsnull != aNextFrameResult, "null ptr");
NS_ASSERTION(ContainsFrame(aAfterFrame), "split after unknown frame");
if ((nsnull != aNextFrameResult) && (nsnull != aAfterFrame)) {
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nsIFrame* nextFrame;
aAfterFrame->GetNextSibling(&nextFrame);
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aAfterFrame->SetNextSibling(nsnull);
*aNextFrameResult = nextFrame;
return PR_TRUE;
}
return PR_FALSE;
}
nsIFrame*
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nsFrameList::PullFrame(nsIFrame* aParent,
nsIFrame* aLastChild,
nsFrameList& aFromList)
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{
NS_PRECONDITION(nsnull != aParent, "null ptr");
nsIFrame* pulledFrame = nsnull;
if (nsnull != aParent) {
pulledFrame = aFromList.FirstChild();
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if (nsnull != pulledFrame) {
// Take frame off old list
aFromList.RemoveFirstChild();
// Put it on the end of this list
if (nsnull == aLastChild) {
NS_ASSERTION(nsnull == mFirstChild, "bad aLastChild");
mFirstChild = pulledFrame;
}
else {
aLastChild->SetNextSibling(pulledFrame);
}
pulledFrame->SetParent(aParent);
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}
}
return pulledFrame;
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}
nsIFrame*
nsFrameList::LastChild() const
{
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
nsIFrame* next;
frame->GetNextSibling(&next);
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if (nsnull == next) {
break;
}
frame = next;
}
return frame;
}
nsIFrame*
nsFrameList::FrameAt(PRInt32 aIndex) const
{
NS_PRECONDITION(aIndex >= 0, "invalid arg");
if (aIndex < 0) return nsnull;
nsIFrame* frame = mFirstChild;
while ((aIndex-- > 0) && (nsnull != frame)) {
frame->GetNextSibling(&frame);
}
return frame;
}
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PRBool
nsFrameList::ContainsFrame(const nsIFrame* aFrame) const
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{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
if (frame == aFrame) {
return PR_TRUE;
}
frame->GetNextSibling(&frame);
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}
return PR_FALSE;
}
PRInt32
nsFrameList::GetLength() const
{
PRInt32 count = 0;
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
count++;
frame->GetNextSibling(&frame);
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}
return count;
}
nsIFrame*
nsFrameList::GetPrevSiblingFor(nsIFrame* aFrame) const
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
if (aFrame == mFirstChild) {
return nsnull;
}
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
nsIFrame* next;
frame->GetNextSibling(&next);
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if (next == aFrame) {
break;
}
frame = next;
}
return frame;
}
void
nsFrameList::VerifyParent(nsIFrame* aParent) const
{
#ifdef NS_DEBUG
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
nsIFrame* parent;
frame->GetParent(&parent);
NS_ASSERTION(parent == aParent, "bad parent");
frame->GetNextSibling(&frame);
}
#endif
}
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#ifdef NS_DEBUG
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void
nsFrameList::List(nsIPresContext* aPresContext, FILE* out) const
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{
fputs("<\n", out);
nsIFrame* frame = mFirstChild;
while (nsnull != frame) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(frame->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
frameDebug->List(aPresContext, out, 1);
}
frame->GetNextSibling(&frame);
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}
fputs(">\n", out);
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}
#endif