gecko-dev/dom/base/MutationObservers.cpp

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C++

/* -*- 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"
#ifdef MOZ_XUL
# include "nsXULElement.h"
#endif
#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;
using mozilla::AutoJSContext;
enum class IsRemoveNotification {
Yes,
No,
};
#ifdef DEBUG
# define COMPOSED_DOC_DECL \
const bool wasInComposedDoc = !!node->GetComposedDoc();
#else
# define COMPOSED_DOC_DECL
#endif
#define CALL_BINDING_MANAGER(func_, params_) \
do { \
} while (0)
// This macro expects the ownerDocument of content_ to be in scope as
// |Document* doc|
#define IMPL_MUTATION_NOTIFICATION(func_, content_, params_, remove_) \
PR_BEGIN_MACRO \
bool needsEnterLeave = doc->MayHaveDOMMutationObservers(); \
if (needsEnterLeave) { \
nsDOMMutationObserver::EnterMutationHandling(); \
} \
nsINode* node = content_; \
COMPOSED_DOC_DECL \
NS_ASSERTION(node->OwnerDoc() == doc, "Bogus document"); \
if (remove_ == IsRemoveNotification::Yes && node->GetComposedDoc()) { \
if (PresShell* presShell = doc->GetObservingPresShell()) { \
presShell->func_ params_; \
} \
} \
CALL_BINDING_MANAGER(func_, params_); \
nsINode* last; \
do { \
nsINode::nsSlots* slots = node->GetExistingSlots(); \
if (slots && !slots->mMutationObservers.IsEmpty()) { \
NS_OBSERVER_AUTO_ARRAY_NOTIFY_OBSERVERS( \
slots->mMutationObservers, nsIMutationObserver, 1, func_, params_); \
} \
last = node; \
if (ShadowRoot* shadow = ShadowRoot::FromNode(node)) { \
node = shadow->GetHost(); \
} else { \
node = node->GetParentNode(); \
} \
} while (node); \
/* Whitelist NativeAnonymousChildListChange removal notifications from \
* the assertion since it runs from UnbindFromTree, and thus we don't \
* reach the document, but doesn't matter. */ \
MOZ_ASSERT((last == doc) == wasInComposedDoc || \
(remove_ == IsRemoveNotification::Yes && \
!strcmp(#func_, "NativeAnonymousChildListChange"))); \
if (remove_ == IsRemoveNotification::No && last == doc) { \
if (PresShell* presShell = doc->GetObservingPresShell()) { \
presShell->func_ params_; \
} \
} \
if (needsEnterLeave) { \
nsDOMMutationObserver::LeaveMutationHandling(); \
} \
PR_END_MACRO
#define IMPL_ANIMATION_NOTIFICATION(func_, content_, params_) \
PR_BEGIN_MACRO \
bool needsEnterLeave = doc->MayHaveDOMMutationObservers(); \
if (needsEnterLeave) { \
nsDOMMutationObserver::EnterMutationHandling(); \
} \
nsINode* node = content_; \
do { \
nsINode::nsSlots* slots = node->GetExistingSlots(); \
if (slots && !slots->mMutationObservers.IsEmpty()) { \
NS_OBSERVER_AUTO_ARRAY_NOTIFY_OBSERVERS_WITH_QI( \
slots->mMutationObservers, nsIMutationObserver, 1, \
nsIAnimationObserver, func_, params_); \
} \
if (ShadowRoot* shadow = ShadowRoot::FromNode(node)) { \
node = shadow->GetHost(); \
} else { \
node = node->GetParentNode(); \
} \
} while (node); \
if (needsEnterLeave) { \
nsDOMMutationObserver::LeaveMutationHandling(); \
} \
PR_END_MACRO
namespace mozilla {
void MutationObservers::NotifyCharacterDataWillChange(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
Document* doc = aContent->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(CharacterDataWillChange, aContent,
(aContent, aInfo), IsRemoveNotification::No);
}
void MutationObservers::NotifyCharacterDataChanged(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
Document* doc = aContent->OwnerDoc();
doc->Changed();
IMPL_MUTATION_NOTIFICATION(CharacterDataChanged, aContent, (aContent, aInfo),
IsRemoveNotification::No);
}
void MutationObservers::NotifyAttributeWillChange(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
Document* doc = aElement->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(AttributeWillChange, aElement,
(aElement, aNameSpaceID, aAttribute, aModType),
IsRemoveNotification::No);
}
void MutationObservers::NotifyAttributeChanged(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue) {
Document* doc = aElement->OwnerDoc();
doc->Changed();
IMPL_MUTATION_NOTIFICATION(
AttributeChanged, aElement,
(aElement, aNameSpaceID, aAttribute, aModType, aOldValue),
IsRemoveNotification::No);
}
void MutationObservers::NotifyAttributeSetToCurrentValue(Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute) {
Document* doc = aElement->OwnerDoc();
IMPL_MUTATION_NOTIFICATION(AttributeSetToCurrentValue, aElement,
(aElement, aNameSpaceID, aAttribute),
IsRemoveNotification::No);
}
void MutationObservers::NotifyContentAppended(nsIContent* aContainer,
nsIContent* aFirstNewContent) {
Document* doc = aContainer->OwnerDoc();
doc->Changed();
IMPL_MUTATION_NOTIFICATION(ContentAppended, aContainer, (aFirstNewContent),
IsRemoveNotification::No);
}
void MutationObservers::NotifyNativeAnonymousChildListChange(
nsIContent* aContent, bool aIsRemove) {
Document* doc = aContent->OwnerDoc();
auto isRemove =
aIsRemove ? IsRemoveNotification::Yes : IsRemoveNotification::No;
IMPL_MUTATION_NOTIFICATION(NativeAnonymousChildListChange, aContent,
(aContent, aIsRemove), isRemove);
}
void MutationObservers::NotifyContentInserted(nsINode* aContainer,
nsIContent* aChild) {
MOZ_ASSERT(aContainer->IsContent() || aContainer->IsDocument(),
"container must be an nsIContent or an Document");
Document* doc = aContainer->OwnerDoc();
doc->Changed();
IMPL_MUTATION_NOTIFICATION(ContentInserted, aContainer, (aChild),
IsRemoveNotification::No);
}
void MutationObservers::NotifyContentRemoved(nsINode* aContainer,
nsIContent* aChild,
nsIContent* aPreviousSibling) {
MOZ_ASSERT(aContainer->IsContent() || aContainer->IsDocument(),
"container must be an nsIContent or an Document");
Document* doc = aContainer->OwnerDoc();
doc->Changed();
MOZ_ASSERT(aChild->GetParentNode() == aContainer,
"We expect the parent link to be still around at this point");
IMPL_MUTATION_NOTIFICATION(ContentRemoved, aContainer,
(aChild, aPreviousSibling),
IsRemoveNotification::Yes);
}
} // 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);
}