1 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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17 : * The Initial Developer of the Original Code is
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19 : * Portions created by the Initial Developer are Copyright (C) 1998
20 : * the Initial Developer. All Rights Reserved.
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22 : * Contributor(s):
23 : *
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37 :
38 : /*
39 : * a list of the recomputation that needs to be done in response to a
40 : * style change
41 : */
42 :
43 : #include "nsStyleChangeList.h"
44 : #include "nsStyleConsts.h"
45 : #include "nsIFrame.h"
46 : #include "nsIContent.h"
47 : #include "nsCRT.h"
48 :
49 : static const PRUint32 kGrowArrayBy = 10;
50 :
51 0 : nsStyleChangeList::nsStyleChangeList()
52 : : mArray(mBuffer),
53 : mArraySize(kStyleChangeBufferSize),
54 0 : mCount(0)
55 : {
56 0 : MOZ_COUNT_CTOR(nsStyleChangeList);
57 0 : }
58 :
59 0 : nsStyleChangeList::~nsStyleChangeList()
60 : {
61 0 : MOZ_COUNT_DTOR(nsStyleChangeList);
62 0 : Clear();
63 0 : }
64 :
65 : nsresult
66 0 : nsStyleChangeList::ChangeAt(PRInt32 aIndex, nsIFrame*& aFrame, nsIContent*& aContent,
67 : nsChangeHint& aHint) const
68 : {
69 0 : if ((0 <= aIndex) && (aIndex < mCount)) {
70 0 : aFrame = mArray[aIndex].mFrame;
71 0 : aContent = mArray[aIndex].mContent;
72 0 : aHint = mArray[aIndex].mHint;
73 0 : return NS_OK;
74 : }
75 0 : return NS_ERROR_ILLEGAL_VALUE;
76 : }
77 :
78 : nsresult
79 0 : nsStyleChangeList::ChangeAt(PRInt32 aIndex, const nsStyleChangeData** aChangeData) const
80 : {
81 0 : if ((0 <= aIndex) && (aIndex < mCount)) {
82 0 : *aChangeData = &mArray[aIndex];
83 0 : return NS_OK;
84 : }
85 0 : return NS_ERROR_ILLEGAL_VALUE;
86 : }
87 :
88 : nsresult
89 0 : nsStyleChangeList::AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint)
90 : {
91 0 : NS_ASSERTION(aFrame || (aHint & nsChangeHint_ReconstructFrame),
92 : "must have frame");
93 0 : NS_ASSERTION(aContent || !(aHint & nsChangeHint_ReconstructFrame),
94 : "must have content");
95 : // XXXbz we should make this take Element instead of nsIContent
96 0 : NS_ASSERTION(!aContent || aContent->IsElement(),
97 : "Shouldn't be trying to restyle non-elements directly");
98 0 : NS_ASSERTION(!(aHint & nsChangeHint_ReflowFrame) ||
99 : (aHint & nsChangeHint_NeedReflow),
100 : "Reflow hint bits set without actually asking for a reflow");
101 :
102 0 : if ((0 < mCount) && (aHint & nsChangeHint_ReconstructFrame)) { // filter out all other changes for same content
103 0 : if (aContent) {
104 0 : for (PRInt32 index = mCount - 1; index >= 0; --index) {
105 0 : if (aContent == mArray[index].mContent) { // remove this change
106 0 : aContent->Release();
107 0 : mCount--;
108 0 : if (index < mCount) { // move later changes down
109 0 : ::memmove(&mArray[index], &mArray[index + 1],
110 0 : (mCount - index) * sizeof(nsStyleChangeData));
111 : }
112 : }
113 : }
114 : }
115 : }
116 :
117 0 : PRInt32 last = mCount - 1;
118 0 : if ((0 < mCount) && aFrame && (aFrame == mArray[last].mFrame)) { // same as last frame
119 0 : NS_UpdateHint(mArray[last].mHint, aHint);
120 : }
121 : else {
122 0 : if (mCount == mArraySize) {
123 0 : PRInt32 newSize = mArraySize + kGrowArrayBy;
124 0 : nsStyleChangeData* newArray = new nsStyleChangeData[newSize];
125 0 : if (newArray) {
126 0 : memcpy(newArray, mArray, mCount * sizeof(nsStyleChangeData));
127 0 : if (mArray != mBuffer) {
128 0 : delete [] mArray;
129 : }
130 0 : mArray = newArray;
131 0 : mArraySize = newSize;
132 : }
133 : else {
134 0 : return NS_ERROR_OUT_OF_MEMORY;
135 : }
136 : }
137 0 : mArray[mCount].mFrame = aFrame;
138 0 : mArray[mCount].mContent = aContent;
139 0 : if (aContent) {
140 0 : aContent->AddRef();
141 : }
142 0 : mArray[mCount].mHint = aHint;
143 0 : mCount++;
144 : }
145 0 : return NS_OK;
146 : }
147 :
148 : void
149 0 : nsStyleChangeList::Clear()
150 : {
151 0 : for (PRInt32 index = mCount - 1; index >= 0; --index) {
152 0 : nsIContent* content = mArray[index].mContent;
153 0 : if (content) {
154 0 : content->Release();
155 : }
156 : }
157 0 : if (mArray != mBuffer) {
158 0 : delete [] mArray;
159 0 : mArray = mBuffer;
160 0 : mArraySize = kStyleChangeBufferSize;
161 : }
162 0 : mCount = 0;
163 0 : }
164 :
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