137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* a list of the recomputation that needs to be done in response to a
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* style change
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*/
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#include "nsStyleChangeList.h"
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#include "nsIContent.h"
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#include "nsIFrame.h"
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#include "nsFrameManager.h"
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static const uint32_t kGrowArrayBy = 10;
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nsStyleChangeList::nsStyleChangeList()
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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()
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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(int32_t aIndex, nsIFrame*& aFrame, nsIContent*& aContent,
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nsChangeHint& 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::ChangeAt(int32_t aIndex, const nsStyleChangeData** aChangeData) const
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{
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if ((0 <= aIndex) && (aIndex < mCount)) {
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*aChangeData = &mArray[aIndex];
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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, nsChangeHint aHint)
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{
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NS_ASSERTION(aFrame || (aHint & nsChangeHint_ReconstructFrame),
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"must have frame");
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NS_ASSERTION(aContent || !(aHint & nsChangeHint_ReconstructFrame),
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"must have content");
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// XXXbz we should make this take Element instead of nsIContent
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NS_ASSERTION(!aContent || aContent->IsElement() ||
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// display:contents elements posts the changes for their children:
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(aFrame && aContent->GetParent() &&
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aFrame->PresContext()->FrameManager()->
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GetDisplayContentsStyleFor(aContent->GetParent())),
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"Shouldn't be trying to restyle non-elements directly, "
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"except if it's a display:contents child");
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NS_ASSERTION(!(aHint & nsChangeHint_AllReflowHints) ||
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(aHint & nsChangeHint_NeedReflow),
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"Reflow hint bits set without actually asking for a reflow");
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if ((0 < mCount) && (aHint & nsChangeHint_ReconstructFrame)) { // filter out all other changes for same content
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if (aContent) {
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for (int32_t index = mCount - 1; index >= 0; --index) {
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if (aContent == mArray[index].mContent) { // remove this change
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aContent->Release();
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mCount--;
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if (index < mCount) { // move later changes down
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::memmove(&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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int32_t last = mCount - 1;
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if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame
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NS_UpdateHint(mArray[last].mHint, aHint);
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}
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else {
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if (mCount == mArraySize) {
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int32_t newSize = mArraySize + kGrowArrayBy;
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nsStyleChangeData* newArray = new nsStyleChangeData[newSize];
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if (newArray) {
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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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if (aContent) {
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aContent->AddRef();
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}
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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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for (int32_t index = mCount - 1; index >= 0; --index) {
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nsIContent* content = mArray[index].mContent;
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if (content) {
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content->Release();
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}
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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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