1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/base/nsStyleChangeList.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,129 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/*
1.10 + * a list of the recomputation that needs to be done in response to a
1.11 + * style change
1.12 + */
1.13 +
1.14 +#include "nsStyleChangeList.h"
1.15 +#include "nsIContent.h"
1.16 +
1.17 +static const uint32_t kGrowArrayBy = 10;
1.18 +
1.19 +nsStyleChangeList::nsStyleChangeList()
1.20 + : mArray(mBuffer),
1.21 + mArraySize(kStyleChangeBufferSize),
1.22 + mCount(0)
1.23 +{
1.24 + MOZ_COUNT_CTOR(nsStyleChangeList);
1.25 +}
1.26 +
1.27 +nsStyleChangeList::~nsStyleChangeList()
1.28 +{
1.29 + MOZ_COUNT_DTOR(nsStyleChangeList);
1.30 + Clear();
1.31 +}
1.32 +
1.33 +nsresult
1.34 +nsStyleChangeList::ChangeAt(int32_t aIndex, nsIFrame*& aFrame, nsIContent*& aContent,
1.35 + nsChangeHint& aHint) const
1.36 +{
1.37 + if ((0 <= aIndex) && (aIndex < mCount)) {
1.38 + aFrame = mArray[aIndex].mFrame;
1.39 + aContent = mArray[aIndex].mContent;
1.40 + aHint = mArray[aIndex].mHint;
1.41 + return NS_OK;
1.42 + }
1.43 + return NS_ERROR_ILLEGAL_VALUE;
1.44 +}
1.45 +
1.46 +nsresult
1.47 +nsStyleChangeList::ChangeAt(int32_t aIndex, const nsStyleChangeData** aChangeData) const
1.48 +{
1.49 + if ((0 <= aIndex) && (aIndex < mCount)) {
1.50 + *aChangeData = &mArray[aIndex];
1.51 + return NS_OK;
1.52 + }
1.53 + return NS_ERROR_ILLEGAL_VALUE;
1.54 +}
1.55 +
1.56 +nsresult
1.57 +nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint)
1.58 +{
1.59 + NS_ASSERTION(aFrame || (aHint & nsChangeHint_ReconstructFrame),
1.60 + "must have frame");
1.61 + NS_ASSERTION(aContent || !(aHint & nsChangeHint_ReconstructFrame),
1.62 + "must have content");
1.63 + // XXXbz we should make this take Element instead of nsIContent
1.64 + NS_ASSERTION(!aContent || aContent->IsElement(),
1.65 + "Shouldn't be trying to restyle non-elements directly");
1.66 + NS_ASSERTION(!(aHint & nsChangeHint_AllReflowHints) ||
1.67 + (aHint & nsChangeHint_NeedReflow),
1.68 + "Reflow hint bits set without actually asking for a reflow");
1.69 +
1.70 + if ((0 < mCount) && (aHint & nsChangeHint_ReconstructFrame)) { // filter out all other changes for same content
1.71 + if (aContent) {
1.72 + for (int32_t index = mCount - 1; index >= 0; --index) {
1.73 + if (aContent == mArray[index].mContent) { // remove this change
1.74 + aContent->Release();
1.75 + mCount--;
1.76 + if (index < mCount) { // move later changes down
1.77 + ::memmove(&mArray[index], &mArray[index + 1],
1.78 + (mCount - index) * sizeof(nsStyleChangeData));
1.79 + }
1.80 + }
1.81 + }
1.82 + }
1.83 + }
1.84 +
1.85 + int32_t last = mCount - 1;
1.86 + if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame
1.87 + NS_UpdateHint(mArray[last].mHint, aHint);
1.88 + }
1.89 + else {
1.90 + if (mCount == mArraySize) {
1.91 + int32_t newSize = mArraySize + kGrowArrayBy;
1.92 + nsStyleChangeData* newArray = new nsStyleChangeData[newSize];
1.93 + if (newArray) {
1.94 + memcpy(newArray, mArray, mCount * sizeof(nsStyleChangeData));
1.95 + if (mArray != mBuffer) {
1.96 + delete [] mArray;
1.97 + }
1.98 + mArray = newArray;
1.99 + mArraySize = newSize;
1.100 + }
1.101 + else {
1.102 + return NS_ERROR_OUT_OF_MEMORY;
1.103 + }
1.104 + }
1.105 + mArray[mCount].mFrame = aFrame;
1.106 + mArray[mCount].mContent = aContent;
1.107 + if (aContent) {
1.108 + aContent->AddRef();
1.109 + }
1.110 + mArray[mCount].mHint = aHint;
1.111 + mCount++;
1.112 + }
1.113 + return NS_OK;
1.114 +}
1.115 +
1.116 +void
1.117 +nsStyleChangeList::Clear()
1.118 +{
1.119 + for (int32_t index = mCount - 1; index >= 0; --index) {
1.120 + nsIContent* content = mArray[index].mContent;
1.121 + if (content) {
1.122 + content->Release();
1.123 + }
1.124 + }
1.125 + if (mArray != mBuffer) {
1.126 + delete [] mArray;
1.127 + mArray = mBuffer;
1.128 + mArraySize = kStyleChangeBufferSize;
1.129 + }
1.130 + mCount = 0;
1.131 +}
1.132 +
