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
246
247
248
249
250
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "MutationObservers.h"
#include "nsContentUtils.h"
#include "nsCSSPseudoElements.h"
#include "nsINode.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/Element.h"
#include "nsIMutationObserver.h"
#include "mozilla/EventListenerManager.h"
#include "PLDHashTable.h"
#include "nsCOMArray.h"
#include "nsPIDOMWindow.h"
#include "nsXULElement.h"
#include "nsGenericHTMLElement.h"
#include "mozilla/AnimationTarget.h"
#include "mozilla/Assertions.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/dom/Animation.h"
#include "mozilla/dom/KeyframeEffect.h"
#include "mozilla/PresShell.h"
#include "nsWrapperCacheInlines.h"
#include "nsDOMMutationObserver.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "mozilla/dom/ShadowRoot.h"
using namespace mozilla;
using namespace mozilla::dom;
#define NOTIFY_PRESSHELL(notify_) \
if (PresShell* presShell = doc->GetObservingPresShell()) { \
notify_(presShell); \
}
#define NOTIFIER(func_, ...) \
[&](nsIMutationObserver* aObserver) { aObserver->func_(__VA_ARGS__); }
template <typename NotifyObserver>
static inline nsINode* ForEachAncestorObserver(nsINode* aNode,
NotifyObserver& aFunc,
uint32_t aCallback) {
nsINode* last;
nsINode* node = aNode;
do {
mozilla::SafeDoublyLinkedList<nsIMutationObserver>* observers =
node->GetMutationObservers();
if (observers) {
for (auto iter = observers->begin(); iter != observers->end(); ++iter) {
if (iter->IsCallbackEnabled(aCallback)) {
aFunc(&*iter);
}
}
}
last = node;
if (!(node = node->GetParentNode())) {
if (ShadowRoot* shadow = ShadowRoot::FromNode(last)) {
node = shadow->GetHost();
}
}
} while (node);
return last;
}
// Whether to notify to the PresShell about a mutation.
// For removals, the pres shell gets notified first, since it needs to operate
// on the "old" DOM shape.
enum class NotifyPresShell { No, Before, After };
template <NotifyPresShell aNotifyPresShell = NotifyPresShell::After,
typename NotifyObserver>
static inline void Notify(nsINode* aNode, NotifyObserver&& aNotify,
uint32_t aCallback) {
Document* doc = aNode->OwnerDoc();
nsDOMMutationEnterLeave enterLeave(doc);
#ifdef DEBUG
const bool wasConnected = aNode->IsInComposedDoc();
#endif
if constexpr (aNotifyPresShell == NotifyPresShell::Before) {
if (aNode->IsInComposedDoc()) {
NOTIFY_PRESSHELL(aNotify);
}
}
nsINode* last = ForEachAncestorObserver(aNode, aNotify, aCallback);
// For non-removals, the pres shell gets notified last, since it needs to
// operate on the "final" DOM shape.
if constexpr (aNotifyPresShell == NotifyPresShell::After) {
if (last == doc) {
NOTIFY_PRESSHELL(aNotify);
}
}
MOZ_ASSERT((last == doc) == wasConnected,
"If we were connected we should notify all ancestors all the "
"way to the document");
}
#define IMPL_ANIMATION_NOTIFICATION(func_, content_, params_) \
PR_BEGIN_MACRO \
nsDOMMutationEnterLeave enterLeave(doc); \
auto forEach = [&](nsIMutationObserver* aObserver) { \
if (nsCOMPtr<nsIAnimationObserver> obs = do_QueryInterface(aObserver)) { \
obs->func_ params_; \
} \
}; \
ForEachAncestorObserver(content_, forEach, nsIMutationObserver::k##func_); \
PR_END_MACRO
namespace mozilla {
void MutationObservers::NotifyCharacterDataWillChange(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
Notify(aContent, NOTIFIER(CharacterDataWillChange, aContent, aInfo),
nsIMutationObserver::kCharacterDataWillChange);
}
void MutationObservers::NotifyCharacterDataChanged(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
aContent->OwnerDoc()->Changed();
Notify(aContent, NOTIFIER(CharacterDataChanged, aContent, aInfo),
nsIMutationObserver::kCharacterDataChanged);
}
void MutationObservers::NotifyAttributeWillChange(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
Notify(aElement,
NOTIFIER(AttributeWillChange, aElement, aNameSpaceID, aAttribute,
aModType),
nsIMutationObserver::kAttributeWillChange);
}
void MutationObservers::NotifyAttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue) {
aElement->OwnerDoc()->Changed();
Notify(aElement,
NOTIFIER(AttributeChanged, aElement, aNameSpaceID, aAttribute,
aModType, aOldValue),
nsIMutationObserver::kAttributeChanged);
}
void MutationObservers::NotifyAttributeSetToCurrentValue(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute) {
Notify(
aElement,
NOTIFIER(AttributeSetToCurrentValue, aElement, aNameSpaceID, aAttribute),
nsIMutationObserver::kAttributeSetToCurrentValue);
}
void MutationObservers::NotifyContentAppended(nsIContent* aContainer,
nsIContent* aFirstNewContent) {
aContainer->OwnerDoc()->Changed();
Notify(aContainer, NOTIFIER(ContentAppended, aFirstNewContent),
nsIMutationObserver::kContentAppended);
}
void MutationObservers::NotifyContentInserted(nsINode* aContainer,
nsIContent* aChild) {
MOZ_ASSERT(aContainer->IsContent() || aContainer->IsDocument(),
"container must be an nsIContent or an Document");
aContainer->OwnerDoc()->Changed();
Notify(aContainer, NOTIFIER(ContentInserted, aChild),
nsIMutationObserver::kContentInserted);
}
void MutationObservers::NotifyContentRemoved(nsINode* aContainer,
nsIContent* aChild,
nsIContent* aPreviousSibling) {
MOZ_ASSERT(aContainer->IsContent() || aContainer->IsDocument(),
"container must be an nsIContent or an Document");
aContainer->OwnerDoc()->Changed();
MOZ_ASSERT(aChild->GetParentNode() == aContainer,
"We expect the parent link to be still around at this point");
Notify<NotifyPresShell::Before>(
aContainer, NOTIFIER(ContentRemoved, aChild, aPreviousSibling),
nsIMutationObserver::kContentRemoved);
}
void MutationObservers::NotifyARIAAttributeDefaultWillChange(
mozilla::dom::Element* aElement, nsAtom* aAttribute, int32_t aModType) {
Notify<NotifyPresShell::No>(
aElement,
NOTIFIER(ARIAAttributeDefaultWillChange, aElement, aAttribute, aModType),
nsIMutationObserver::kARIAAttributeDefaultWillChange);
}
void MutationObservers::NotifyARIAAttributeDefaultChanged(
mozilla::dom::Element* aElement, nsAtom* aAttribute, int32_t aModType) {
Notify<NotifyPresShell::No>(
aElement,
NOTIFIER(ARIAAttributeDefaultChanged, aElement, aAttribute, aModType),
nsIMutationObserver::kARIAAttributeDefaultChanged);
}
} // namespace mozilla
void MutationObservers::NotifyAnimationMutated(
dom::Animation* aAnimation, AnimationMutationType aMutatedType) {
MOZ_ASSERT(aAnimation);
NonOwningAnimationTarget target = aAnimation->GetTargetForAnimation();
if (!target) {
return;
}
// A pseudo element and its parent element use the same owner doc.
Document* doc = target.mElement->OwnerDoc();
if (doc->MayHaveAnimationObservers()) {
// we use the its parent element as the subject in DOM Mutation Observer.
Element* elem = target.mElement;
switch (aMutatedType) {
case AnimationMutationType::Added:
IMPL_ANIMATION_NOTIFICATION(AnimationAdded, elem, (aAnimation));
break;
case AnimationMutationType::Changed:
IMPL_ANIMATION_NOTIFICATION(AnimationChanged, elem, (aAnimation));
break;
case AnimationMutationType::Removed:
IMPL_ANIMATION_NOTIFICATION(AnimationRemoved, elem, (aAnimation));
break;
default:
MOZ_ASSERT_UNREACHABLE("unexpected mutation type");
}
}
}
void MutationObservers::NotifyAnimationAdded(dom::Animation* aAnimation) {
NotifyAnimationMutated(aAnimation, AnimationMutationType::Added);
}
void MutationObservers::NotifyAnimationChanged(dom::Animation* aAnimation) {
NotifyAnimationMutated(aAnimation, AnimationMutationType::Changed);
}
void MutationObservers::NotifyAnimationRemoved(dom::Animation* aAnimation) {
NotifyAnimationMutated(aAnimation, AnimationMutationType::Removed);
}
|
