gecko-dev/layout/base/nsStyleChangeList.cpp

122 lines
3.4 KiB
C++

/* -*- 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/
*
* 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.org 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):
*/
#include "nsStyleChangeList.h"
#include "nsStyleConsts.h"
#include "nsIFrame.h"
#include "nsIContent.h"
#include "nsCRT.h"
static const PRUint32 kGrowArrayBy = 10;
MOZ_DECL_CTOR_COUNTER(nsStyleChangeList)
nsStyleChangeList::nsStyleChangeList(void)
: mArray(mBuffer),
mArraySize(kStyleChangeBufferSize),
mCount(0)
{
MOZ_COUNT_CTOR(nsStyleChangeList);
}
nsStyleChangeList::~nsStyleChangeList(void)
{
MOZ_COUNT_DTOR(nsStyleChangeList);
Clear();
}
nsresult
nsStyleChangeList::ChangeAt(PRInt32 aIndex, nsIFrame*& aFrame, nsIContent*& aContent,
PRInt32& aHint) const
{
if ((0 <= aIndex) && (aIndex < mCount)) {
aFrame = mArray[aIndex].mFrame;
aContent = mArray[aIndex].mContent;
aHint = mArray[aIndex].mHint;
return NS_OK;
}
return NS_ERROR_ILLEGAL_VALUE;
}
nsresult
nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent, PRInt32 aHint)
{
NS_ASSERTION(aFrame || (aHint >= NS_STYLE_HINT_FRAMECHANGE), "must have frame");
NS_ASSERTION(aContent || (aHint < NS_STYLE_HINT_FRAMECHANGE), "must have content");
if ((0 < mCount) && (NS_STYLE_HINT_FRAMECHANGE == aHint)) { // filter out all other changes for same content
if (aContent) {
PRInt32 index = mCount;
while (0 < index--) {
if (aContent == mArray[index].mContent) { // remove this change
mCount--;
if (index < mCount) { // move later changes down
nsCRT::memcpy(&(mArray[index]), &(mArray[index + 1]),
(mCount - index) * sizeof(nsStyleChangeData));
}
}
}
}
}
PRInt32 last = mCount - 1;
if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame
if (mArray[last].mHint < aHint) {
mArray[last].mHint = aHint;
}
}
else {
if (mCount == mArraySize) {
PRInt32 newSize = mArraySize + kGrowArrayBy;
nsStyleChangeData* newArray = new nsStyleChangeData[newSize];
if (newArray) {
nsCRT::memcpy(newArray, mArray, mCount * sizeof(nsStyleChangeData));
if (mArray != mBuffer) {
delete [] mArray;
}
mArray = newArray;
mArraySize = newSize;
}
else {
return NS_ERROR_OUT_OF_MEMORY;
}
}
mArray[mCount].mFrame = aFrame;
mArray[mCount].mContent = aContent;
mArray[mCount].mHint = aHint;
mCount++;
}
return NS_OK;
}
void
nsStyleChangeList::Clear()
{
if (mArray != mBuffer) {
delete [] mArray;
mArray = mBuffer;
mArraySize = kStyleChangeBufferSize;
}
mCount = 0;
}