gecko-dev/layout/generic/nsFrameList.cpp

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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
*
* 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/
*
* 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.
*
* 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* 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 ***** */
#include "nsFrameList.h"
#ifdef NS_DEBUG
#include "nsIFrameDebug.h"
#endif
#ifdef IBMBIDI
#include "nsCOMPtr.h"
#include "nsLayoutAtoms.h"
#include "nsILineIterator.h"
/**
* Helper class for comparing the location of frames. Used by
* GetPrevVisualFor() and GetNextVisualFor()
*/
#define LINE_MIN 0
#define XCOORD_MIN 0x80000000
#define MY_LINE_MAX 0x7fffffff
#define XCOORD_MAX 0x7fffffff
class nsFrameOrigin {
public:
// default constructor
nsFrameOrigin() {
mLine = 0;
mXCoord = 0;
}
nsFrameOrigin(PRInt32 line, nscoord xCoord) {
mLine = line;
mXCoord = xCoord;
}
// copy constructor
nsFrameOrigin(const nsFrameOrigin& aFrameOrigin) {
mLine = aFrameOrigin.mLine;
mXCoord = aFrameOrigin.mXCoord;
}
~nsFrameOrigin() {
}
nsFrameOrigin& operator=(const nsFrameOrigin& aFrameOrigin) {
mLine = aFrameOrigin.mLine;
mXCoord = aFrameOrigin.mXCoord;
return *this;
}
PRBool operator<(const nsFrameOrigin& aFrameOrigin) {
if (mLine < aFrameOrigin.mLine) {
return PR_TRUE;
}
if (mLine > aFrameOrigin.mLine) {
return PR_FALSE;
}
if (mXCoord < aFrameOrigin.mXCoord) {
return PR_TRUE;
}
return PR_FALSE;
}
PRBool operator>(const nsFrameOrigin& aFrameOrigin) {
if (mLine > aFrameOrigin.mLine) {
return PR_TRUE;
}
if (mLine < aFrameOrigin.mLine) {
return PR_FALSE;
}
if (mXCoord > aFrameOrigin.mXCoord) {
return PR_TRUE;
}
return PR_FALSE;
}
PRBool operator==(const nsFrameOrigin& aFrameOrigin) {
if (aFrameOrigin.mLine == mLine && aFrameOrigin.mXCoord == mXCoord) {
return PR_TRUE;
}
return PR_FALSE;
}
protected:
PRInt32 mLine;
nscoord mXCoord;
};
#endif // IBMBIDI
void
nsFrameList::DestroyFrames(nsIPresContext* aPresContext)
{
nsIFrame* next;
for (nsIFrame* frame = mFirstChild; frame; frame = next) {
next = frame->GetNextSibling();
frame->Destroy(aPresContext);
mFirstChild = next;
}
}
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 (aParent) {
for (nsIFrame* frame = aFrameList; frame;
frame = frame->GetNextSibling()) {
frame->SetParent(aParent);
}
}
}
}
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();
aFrame->SetNextSibling(nsnull);
if (aFrame == mFirstChild) {
mFirstChild = nextFrame;
return PR_TRUE;
}
else {
nsIFrame* prevSibling = GetPrevSiblingFor(aFrame);
if (prevSibling) {
prevSibling->SetNextSibling(nextFrame);
return PR_TRUE;
}
}
}
// aFrame was not in the list.
return PR_FALSE;
}
PRBool
nsFrameList::RemoveFirstChild()
{
if (mFirstChild) {
nsIFrame* nextFrame = mFirstChild->GetNextSibling();
mFirstChild->SetNextSibling(nsnull);
mFirstChild = nextFrame;
return PR_TRUE;
}
return PR_FALSE;
}
PRBool
nsFrameList::DestroyFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
if (RemoveFrame(aFrame)) {
aFrame->Destroy(aPresContext);
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();
aPrevSibling->SetNextSibling(aNewFrame);
aNewFrame->SetNextSibling(nextFrame);
}
if (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;
if (aParent) {
for (nsIFrame* frame = aFrameList; frame;
frame = frame->GetNextSibling()) {
frame->SetParent(aParent);
lastNewFrame = frame;
}
}
// Get the last new frame if necessary
if (!lastNewFrame) {
nsFrameList tmp(aFrameList);
lastNewFrame = tmp.LastChild();
}
// Link the new frames into the child list
if (nsnull == aPrevSibling) {
lastNewFrame->SetNextSibling(mFirstChild);
mFirstChild = aFrameList;
}
else {
nsIFrame* nextFrame = aPrevSibling->GetNextSibling();
aPrevSibling->SetNextSibling(aFrameList);
lastNewFrame->SetNextSibling(nextFrame);
}
}
}
PRBool
nsFrameList::DoReplaceFrame(nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame)
{
NS_PRECONDITION(aOldFrame, "null ptr");
NS_PRECONDITION(aNewFrame, "null ptr");
if (!aOldFrame || !aNewFrame) {
return PR_FALSE;
}
nsIFrame* nextFrame = aOldFrame->GetNextSibling();
if (aOldFrame == mFirstChild) {
mFirstChild = aNewFrame;
}
else {
nsIFrame* prevSibling = GetPrevSiblingFor(aOldFrame);
if (!prevSibling) {
NS_WARNING("nsFrameList::ReplaceFrame: aOldFrame not found in list");
return PR_FALSE;
}
prevSibling->SetNextSibling(aNewFrame);
}
aNewFrame->SetNextSibling(nextFrame);
if (aParent) {
aNewFrame->SetParent(aParent);
}
return PR_TRUE;
}
PRBool
nsFrameList::ReplaceFrame(nsIPresContext* aPresContext,
nsIFrame* aParent,
nsIFrame* aOldFrame,
nsIFrame* aNewFrame,
PRBool aDestroy)
{
NS_PRECONDITION(aOldFrame, "null ptr");
NS_PRECONDITION(aNewFrame, "null ptr");
if (DoReplaceFrame(aParent, aOldFrame, aNewFrame)) {
if (aDestroy) {
aOldFrame->Destroy(aPresContext);
}
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 (aNextFrameResult && aAfterFrame) {
nsIFrame* nextFrame = aAfterFrame->GetNextSibling();
aAfterFrame->SetNextSibling(nsnull);
*aNextFrameResult = nextFrame;
return PR_TRUE;
}
return PR_FALSE;
}
nsIFrame*
nsFrameList::PullFrame(nsIFrame* aParent,
nsIFrame* aLastChild,
nsFrameList& aFromList)
{
NS_PRECONDITION(nsnull != aParent, "null ptr");
nsIFrame* pulledFrame = nsnull;
if (nsnull != aParent) {
pulledFrame = aFromList.FirstChild();
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);
}
}
return pulledFrame;
}
nsIFrame*
nsFrameList::LastChild() const
{
nsIFrame* frame = mFirstChild;
if (!frame) {
return nsnull;
}
nsIFrame* next = frame->GetNextSibling();
while (next) {
frame = next;
next = frame->GetNextSibling();
}
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) && frame) {
frame = frame->GetNextSibling();
}
return frame;
}
PRBool
nsFrameList::ContainsFrame(const nsIFrame* aFrame) const
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
nsIFrame* frame = mFirstChild;
while (frame) {
if (frame == aFrame) {
return PR_TRUE;
}
frame = frame->GetNextSibling();
}
return PR_FALSE;
}
PRInt32
nsFrameList::GetLength() const
{
PRInt32 count = 0;
nsIFrame* frame = mFirstChild;
while (frame) {
count++;
frame = frame->GetNextSibling();
}
return count;
}
nsIFrame*
nsFrameList::GetPrevSiblingFor(nsIFrame* aFrame) const
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
if (aFrame == mFirstChild) {
return nsnull;
}
nsIFrame* frame = mFirstChild;
while (frame) {
nsIFrame* next = frame->GetNextSibling();
if (next == aFrame) {
break;
}
frame = next;
}
return frame;
}
void
nsFrameList::VerifyParent(nsIFrame* aParent) const
{
#ifdef NS_DEBUG
for (nsIFrame* frame = mFirstChild; frame;
frame = frame->GetNextSibling()) {
NS_ASSERTION(frame->GetParent() == aParent, "bad parent");
}
#endif
}
#ifdef NS_DEBUG
void
nsFrameList::List(nsIPresContext* aPresContext, FILE* out) const
{
fputs("<\n", out);
for (nsIFrame* frame = mFirstChild; frame;
frame = frame->GetNextSibling()) {
nsIFrameDebug* frameDebug;
if (NS_SUCCEEDED(frame->QueryInterface(NS_GET_IID(nsIFrameDebug), (void**)&frameDebug))) {
frameDebug->List(aPresContext, out, 1);
}
}
fputs(">\n", out);
}
#endif
#ifdef IBMBIDI
nsIFrame*
nsFrameList::GetPrevVisualFor(nsIFrame* aFrame) const
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
nsILineIterator* iter;
if (aFrame->GetType() == nsLayoutAtoms::blockFrame)
return GetPrevSiblingFor(aFrame);
nsIFrame* frame;
nsIFrame* furthestFrame = nsnull;
frame = mFirstChild;
nsIFrame* blockFrame = aFrame->GetParent();
if (!blockFrame)
return GetPrevSiblingFor(aFrame);
nsresult result = blockFrame->QueryInterface(NS_GET_IID(nsILineIterator), (void**)&iter);
if (NS_FAILED(result) || !iter) { // If the parent is not a block frame, just check all the siblings
PRInt32 maxX, limX;
maxX = -0x7fffffff;
limX = aFrame->GetRect().x;
while (frame) {
nsRect tempRect = frame->GetRect();
if (tempRect.x > maxX && tempRect.x < limX) { // we are looking for the highest value less than the current one
maxX = tempRect.x;
furthestFrame = frame;
}
frame = frame->GetNextSibling();
}
return furthestFrame;
}
// Otherwise use the LineIterator to check the siblings on this line and the previous line
if (!blockFrame || !iter)
return nsnull;
nsFrameOrigin maxOrig(LINE_MIN, XCOORD_MIN);
PRInt32 testLine, thisLine;
result = iter->FindLineContaining(aFrame, &thisLine);
if (NS_FAILED(result) || thisLine < 0)
return nsnull;
nsFrameOrigin limOrig(thisLine, aFrame->GetRect().x);
while (frame) {
if (NS_SUCCEEDED(iter->FindLineContaining(frame, &testLine))
&& testLine >= 0
&& (testLine == thisLine || testLine == thisLine - 1)) {
nsFrameOrigin testOrig(testLine, frame->GetRect().x);
if (testOrig > maxOrig && testOrig < limOrig) { // we are looking for the highest value less than the current one
maxOrig = testOrig;
furthestFrame = frame;
}
}
frame = frame->GetNextSibling();
}
return furthestFrame;
}
nsIFrame*
nsFrameList::GetNextVisualFor(nsIFrame* aFrame) const
{
NS_PRECONDITION(nsnull != aFrame, "null ptr");
nsILineIterator* iter;
if (aFrame->GetType() == nsLayoutAtoms::blockFrame) {
return aFrame->GetNextSibling();
}
nsIFrame* frame;
nsIFrame* nearestFrame = nsnull;
frame = mFirstChild;
nsIFrame* blockFrame = aFrame->GetParent();
if (!blockFrame)
return GetPrevSiblingFor(aFrame);
nsresult result = blockFrame->QueryInterface(NS_GET_IID(nsILineIterator), (void**)&iter);
if (NS_FAILED(result) || !iter) { // If the parent is not a block frame, just check all the siblings
PRInt32 minX, limX;
minX = 0x7fffffff;
limX = aFrame->GetRect().x;
while (frame) {
nsRect tempRect = frame->GetRect();
if (tempRect.x < minX && tempRect.x > limX) { // we are looking for the lowest value greater than the current one
minX = tempRect.x;
nearestFrame = frame;
}
frame = frame->GetNextSibling();
}
return nearestFrame;
}
// Otherwise use the LineIterator to check the siblings on this line and the previous line
if (!blockFrame || !iter)
return nsnull;
nsFrameOrigin minOrig(MY_LINE_MAX, XCOORD_MAX);
PRInt32 testLine, thisLine;
result = iter->FindLineContaining(aFrame, &thisLine);
if (NS_FAILED(result) || thisLine < 0)
return nsnull;
nsFrameOrigin limOrig(thisLine, aFrame->GetRect().x);
while (frame) {
if (NS_SUCCEEDED(iter->FindLineContaining(frame, &testLine))
&& testLine >= 0
&& (testLine == thisLine || testLine == thisLine + 1)) {
nsFrameOrigin testOrig(testLine, frame->GetRect().x);
if (testOrig < minOrig && testOrig > limOrig) { // we are looking for the lowest value greater than the current one
minOrig = testOrig;
nearestFrame = frame;
}
}
frame = frame->GetNextSibling();
}
return nearestFrame;
}
#endif