1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* base class for rendering objects that can be split across lines,
* columns, or pages
*/
#include "nsSplittableFrame.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsStyleContext.h"
NS_IMPL_FRAMEARENA_HELPERS(nsSplittableFrame)
NS_IMETHODIMP
nsSplittableFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsresult rv = nsFrame::Init(aContent, aParent, aPrevInFlow);
if (aPrevInFlow) {
// Hook the frame into the flow
SetPrevInFlow(aPrevInFlow);
aPrevInFlow->SetNextInFlow(this);
}
return rv;
}
void
nsSplittableFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
// Disconnect from the flow list
if (mPrevContinuation || mNextContinuation) {
RemoveFromFlow(this);
}
// Let the base class destroy the frame
nsFrame::DestroyFrom(aDestructRoot);
}
nsSplittableType
nsSplittableFrame::GetSplittableType() const
{
return NS_FRAME_SPLITTABLE;
}
nsIFrame* nsSplittableFrame::GetPrevContinuation() const
{
return mPrevContinuation;
}
NS_METHOD nsSplittableFrame::SetPrevContinuation(nsIFrame* aFrame)
{
NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev continuation with incorrect type!");
NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
mPrevContinuation = aFrame;
RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetNextContinuation() const
{
return mNextContinuation;
}
NS_METHOD nsSplittableFrame::SetNextContinuation(nsIFrame* aFrame)
{
NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a next continuation with incorrect type!");
NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
mNextContinuation = aFrame;
if (aFrame)
aFrame->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetFirstContinuation() const
{
nsSplittableFrame* firstContinuation = const_cast<nsSplittableFrame*>(this);
while (firstContinuation->mPrevContinuation) {
firstContinuation = static_cast<nsSplittableFrame*>(firstContinuation->mPrevContinuation);
}
NS_POSTCONDITION(firstContinuation, "illegal state in continuation chain.");
return firstContinuation;
}
nsIFrame* nsSplittableFrame::GetLastContinuation() const
{
nsSplittableFrame* lastContinuation = const_cast<nsSplittableFrame*>(this);
while (lastContinuation->mNextContinuation) {
lastContinuation = static_cast<nsSplittableFrame*>(lastContinuation->mNextContinuation);
}
NS_POSTCONDITION(lastContinuation, "illegal state in continuation chain.");
return lastContinuation;
}
#ifdef DEBUG
bool nsSplittableFrame::IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
int32_t iterations = 0;
while (aFrame1 && iterations < 10) {
// Bail out after 10 iterations so we don't bog down debug builds too much
if (aFrame1 == aFrame2)
return true;
aFrame1 = aFrame1->GetPrevContinuation();
++iterations;
}
return false;
}
bool nsSplittableFrame::IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
int32_t iterations = 0;
while (aFrame1 && iterations < 10) {
// Bail out after 10 iterations so we don't bog down debug builds too much
if (aFrame1 == aFrame2)
return true;
aFrame1 = aFrame1->GetNextContinuation();
++iterations;
}
return false;
}
#endif
nsIFrame* nsSplittableFrame::GetPrevInFlow() const
{
return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nullptr;
}
NS_METHOD nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
{
NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev in flow with incorrect type!");
NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
mPrevContinuation = aFrame;
AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetNextInFlow() const
{
return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ?
mNextContinuation : nullptr;
}
NS_METHOD nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
{
NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a next in flow with incorrect type!");
NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
mNextContinuation = aFrame;
if (aFrame)
aFrame->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
return NS_OK;
}
nsIFrame* nsSplittableFrame::GetFirstInFlow() const
{
nsSplittableFrame* firstInFlow = const_cast<nsSplittableFrame*>(this);
while (nsIFrame *prev = firstInFlow->GetPrevInFlow()) {
firstInFlow = static_cast<nsSplittableFrame*>(prev);
}
NS_POSTCONDITION(firstInFlow, "illegal state in flow chain.");
return firstInFlow;
}
nsIFrame* nsSplittableFrame::GetLastInFlow() const
{
nsSplittableFrame* lastInFlow = const_cast<nsSplittableFrame*>(this);
while (nsIFrame* next = lastInFlow->GetNextInFlow()) {
lastInFlow = static_cast<nsSplittableFrame*>(next);
}
NS_POSTCONDITION(lastInFlow, "illegal state in flow chain.");
return lastInFlow;
}
// Remove this frame from the flow. Connects prev in flow and next in flow
void
nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
{
nsIFrame* prevContinuation = aFrame->GetPrevContinuation();
nsIFrame* nextContinuation = aFrame->GetNextContinuation();
// The new continuation is fluid only if the continuation on both sides
// of the removed frame was fluid
if (aFrame->GetPrevInFlow() && aFrame->GetNextInFlow()) {
if (prevContinuation) {
prevContinuation->SetNextInFlow(nextContinuation);
}
if (nextContinuation) {
nextContinuation->SetPrevInFlow(prevContinuation);
}
} else {
if (prevContinuation) {
prevContinuation->SetNextContinuation(nextContinuation);
}
if (nextContinuation) {
nextContinuation->SetPrevContinuation(prevContinuation);
}
}
aFrame->SetPrevInFlow(nullptr);
aFrame->SetNextInFlow(nullptr);
}
#ifdef DEBUG
void
nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, int32_t aIndent)
{
nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent);
if (nullptr != mNextContinuation) {
IndentBy(out, aIndent);
fprintf(out, "<next-continuation va=\"%p\"/>\n", (void*)mNextContinuation);
}
if (nullptr != mPrevContinuation) {
IndentBy(out, aIndent);
fprintf(out, "<prev-continuation va=\"%p\"/>\n", (void*)mPrevContinuation);
}
}
#endif
|
