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
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/core/layout/layout_object_child_list.h"
#include "third_party/blink/renderer/core/accessibility/ax_object_cache.h"
#include "third_party/blink/renderer/core/layout/layout_counter.h"
#include "third_party/blink/renderer/core/layout/layout_inline.h"
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/paint/object_paint_invalidator.h"
namespace blink {
namespace {
// Invalidate InineItems() in LayoutNGText.
//
// They need to be invalidated when moving across inline formatting context
// (i.e., to a different LayoutBlockFlow.)
void InvalidateInlineItems(LayoutObject* object) {
if (object->IsInLayoutNGInlineFormattingContext())
object->SetFirstInlineFragment(nullptr);
if (object->IsText()) {
ToLayoutText(object)->InvalidateInlineItems();
} else if (object->IsLayoutInline()) {
// When moving without |notify_layout_object|, only top-level objects are
// moved. Ensure to invalidate all LayoutNGText in this inline formatting
// context.
for (LayoutObject* curr = object->SlowFirstChild(); curr;
curr = curr->NextSibling())
InvalidateInlineItems(curr);
}
}
} // namespace
void LayoutObjectChildList::DestroyLeftoverChildren() {
while (FirstChild()) {
// List markers are owned by their enclosing list and so don't get destroyed
// by this container.
if (FirstChild()->IsListMarkerIncludingNG()) {
FirstChild()->Remove();
continue;
}
// Destroy any anonymous children remaining in the layout tree, as well as
// implicit (shadow) DOM elements like those used in the engine-based text
// fields.
if (FirstChild()->GetNode())
FirstChild()->GetNode()->SetLayoutObject(nullptr);
FirstChild()->Destroy();
}
}
LayoutObject* LayoutObjectChildList::RemoveChildNode(
LayoutObject* owner,
LayoutObject* old_child,
bool notify_layout_object) {
DCHECK_EQ(old_child->Parent(), owner);
DCHECK_EQ(this, owner->VirtualChildren());
if (old_child->IsFloatingOrOutOfFlowPositioned())
ToLayoutBox(old_child)->RemoveFloatingOrPositionedChildFromBlockLists();
if (!owner->DocumentBeingDestroyed()) {
// So that we'll get the appropriate dirty bit set (either that a normal
// flow child got yanked or that a positioned child got yanked). We also
// issue paint invalidations, so that the area exposed when the child
// disappears gets paint invalidated properly.
if (notify_layout_object && old_child->EverHadLayout()) {
old_child->SetNeedsLayoutAndPrefWidthsRecalc(
layout_invalidation_reason::kRemovedFromLayout);
}
InvalidatePaintOnRemoval(*old_child);
}
// If we have a line box wrapper, delete it.
if (old_child->IsBox())
ToLayoutBox(old_child)->DeleteLineBoxWrapper();
if (!owner->DocumentBeingDestroyed()) {
owner->NotifyOfSubtreeChange();
if (notify_layout_object) {
LayoutCounter::LayoutObjectSubtreeWillBeDetached(old_child);
old_child->WillBeRemovedFromTree();
} else if (old_child->IsBox() &&
ToLayoutBox(old_child)->IsOrthogonalWritingModeRoot()) {
ToLayoutBox(old_child)->UnmarkOrthogonalWritingModeRoot();
}
}
// WARNING: There should be no code running between willBeRemovedFromTree and
// the actual removal below.
// This is needed to avoid race conditions where willBeRemovedFromTree would
// dirty the tree's structure and the code running here would force an
// untimely rebuilding, leaving |oldChild| dangling.
if (old_child->PreviousSibling())
old_child->PreviousSibling()->SetNextSibling(old_child->NextSibling());
if (old_child->NextSibling())
old_child->NextSibling()->SetPreviousSibling(old_child->PreviousSibling());
if (FirstChild() == old_child)
first_child_ = old_child->NextSibling();
if (LastChild() == old_child)
last_child_ = old_child->PreviousSibling();
old_child->SetPreviousSibling(nullptr);
old_child->SetNextSibling(nullptr);
old_child->SetParent(nullptr);
old_child->RegisterSubtreeChangeListenerOnDescendants(
old_child->ConsumesSubtreeChangeNotification());
if (AXObjectCache* cache = owner->GetDocument().ExistingAXObjectCache())
cache->ChildrenChanged(owner);
return old_child;
}
DISABLE_CFI_PERF
void LayoutObjectChildList::InsertChildNode(LayoutObject* owner,
LayoutObject* new_child,
LayoutObject* before_child,
bool notify_layout_object) {
DCHECK(!new_child->Parent());
DCHECK_EQ(this, owner->VirtualChildren());
DCHECK(!owner->IsLayoutBlockFlow() ||
(!new_child->IsTableSection() && !new_child->IsTableRow() &&
!new_child->IsTableCell()));
while (before_child && before_child->Parent() &&
before_child->Parent() != owner)
before_child = before_child->Parent();
// This should never happen, but if it does prevent layout tree corruption
// where child->parent() ends up being owner but
// child->nextSibling()->parent() is not owner.
if (before_child && before_child->Parent() != owner) {
NOTREACHED();
return;
}
new_child->SetParent(owner);
if (FirstChild() == before_child)
first_child_ = new_child;
if (before_child) {
LayoutObject* previous_sibling = before_child->PreviousSibling();
if (previous_sibling)
previous_sibling->SetNextSibling(new_child);
new_child->SetPreviousSibling(previous_sibling);
new_child->SetNextSibling(before_child);
before_child->SetPreviousSibling(new_child);
} else {
if (LastChild())
LastChild()->SetNextSibling(new_child);
new_child->SetPreviousSibling(LastChild());
last_child_ = new_child;
}
if (!owner->DocumentBeingDestroyed()) {
if (notify_layout_object) {
new_child->InsertedIntoTree();
LayoutCounter::LayoutObjectSubtreeAttached(new_child);
} else if (RuntimeEnabledFeatures::LayoutNGEnabled()) {
// |notify_layout_object| is an optimization to skip notifications when
// moving within the same tree. Inline items need to be invalidated even
// when moving.
InvalidateInlineItems(new_child);
}
}
// Propagate the need to notify ancestors down into any
// child nodes.
if (owner->HasSubtreeChangeListenerRegistered())
new_child->RegisterSubtreeChangeListenerOnDescendants(true);
// If the inserted node is currently marked as needing to notify children then
// we have to propagate that mark up the tree.
if (new_child->WasNotifiedOfSubtreeChange())
owner->NotifyAncestorsOfSubtreeChange();
// Clear NeedsCollectInlines to ensure the marking doesn't stop on
// |new_child|.
new_child->ClearNeedsCollectInlines();
new_child->SetNeedsLayoutAndPrefWidthsRecalc(
layout_invalidation_reason::kAddedToLayout);
new_child->SetShouldDoFullPaintInvalidation(
PaintInvalidationReason::kAppeared);
new_child->AddSubtreePaintPropertyUpdateReason(
SubtreePaintPropertyUpdateReason::kContainerChainMayChange);
new_child->SetNeedsOverflowRecalc();
if (!owner->NormalChildNeedsLayout()) {
owner->SetChildNeedsLayout(); // We may supply the static position for an
// absolute positioned child.
} else {
owner->MarkContainerNeedsCollectInlines();
}
if (!owner->DocumentBeingDestroyed())
owner->NotifyOfSubtreeChange();
if (AXObjectCache* cache = owner->GetDocument().ExistingAXObjectCache())
cache->ChildrenChanged(owner);
}
void LayoutObjectChildList::InvalidatePaintOnRemoval(LayoutObject& old_child) {
if (!old_child.IsRooted())
return;
if (old_child.IsBody() && old_child.View())
old_child.View()->SetShouldDoFullPaintInvalidation();
ObjectPaintInvalidator paint_invalidator(old_child);
paint_invalidator.SlowSetPaintingLayerNeedsRepaint();
}
} // namespace blink
|
