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118 lines
3.3 KiB
C++
118 lines
3.3 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsStyleChangeList.h"
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#include "nsStyleConsts.h"
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#include "nsIFrame.h"
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#include "nsIContent.h"
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#include "nsCRT.h"
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static const PRUint32 kGrowArrayBy = 10;
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MOZ_DECL_CTOR_COUNTER(nsStyleChangeList);
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nsStyleChangeList::nsStyleChangeList(void)
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: mArray(mBuffer),
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mArraySize(kStyleChangeBufferSize),
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mCount(0)
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{
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MOZ_COUNT_CTOR(nsStyleChangeList);
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}
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nsStyleChangeList::~nsStyleChangeList(void)
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{
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MOZ_COUNT_DTOR(nsStyleChangeList);
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Clear();
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}
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nsresult
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nsStyleChangeList::ChangeAt(PRInt32 aIndex, nsIFrame*& aFrame, nsIContent*& aContent,
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PRInt32& aHint) const
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{
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if ((0 <= aIndex) && (aIndex < mCount)) {
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aFrame = mArray[aIndex].mFrame;
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aContent = mArray[aIndex].mContent;
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aHint = mArray[aIndex].mHint;
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return NS_OK;
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}
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return NS_ERROR_ILLEGAL_VALUE;
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}
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nsresult
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nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent, PRInt32 aHint)
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{
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NS_ASSERTION(aFrame || (aHint >= NS_STYLE_HINT_FRAMECHANGE), "must have frame");
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NS_ASSERTION(aContent || (aHint < NS_STYLE_HINT_FRAMECHANGE), "must have content");
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if ((0 < mCount) && (NS_STYLE_HINT_FRAMECHANGE == aHint)) { // filter out all other changes for same content
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if (aContent) {
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PRInt32 index = mCount;
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while (0 < index--) {
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if (aContent == mArray[index].mContent) { // remove this change
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mCount--;
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if (index < mCount) { // move later changes down
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nsCRT::memcpy(&(mArray[index]), &(mArray[index + 1]),
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(mCount - index) * sizeof(nsStyleChangeData));
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}
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}
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}
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}
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}
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PRInt32 last = mCount - 1;
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if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame
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if (mArray[last].mHint < aHint) {
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mArray[last].mHint = aHint;
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}
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}
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else {
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if (mCount == mArraySize) {
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PRInt32 newSize = mArraySize + kGrowArrayBy;
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nsStyleChangeData* newArray = new nsStyleChangeData[newSize];
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if (newArray) {
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nsCRT::memcpy(newArray, mArray, mCount * sizeof(nsStyleChangeData));
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if (mArray != mBuffer) {
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delete [] mArray;
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}
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mArray = newArray;
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mArraySize = newSize;
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}
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else {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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mArray[mCount].mFrame = aFrame;
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mArray[mCount].mContent = aContent;
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mArray[mCount].mHint = aHint;
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mCount++;
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}
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return NS_OK;
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}
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void
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nsStyleChangeList::Clear()
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{
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if (mArray != mBuffer) {
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delete [] mArray;
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mArray = mBuffer;
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mArraySize = kStyleChangeBufferSize;
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}
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mCount = 0;
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}
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