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/* -*- 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/. */
#ifndef nsIMutationObserver_h
#define nsIMutationObserver_h
#include "nsISupports.h"
class nsAttrValue;
class nsIAtom;
class nsIContent;
class nsIDocument;
class nsINode;
namespace mozilla {
namespace dom {
class Element;
} // namespace dom
} // namespace mozilla
#define NS_IMUTATION_OBSERVER_IID \
{ 0x6d674c17, 0x0fbc, 0x4633, \
{ 0x8f, 0x46, 0x73, 0x4e, 0x87, 0xeb, 0xf0, 0xc7 } }
/**
* Information details about a characterdata change. Basically, we
* view all changes as replacements of a length of text at some offset
* with some other text (of possibly some other length).
*/
struct CharacterDataChangeInfo
{
/**
* True if this character data change is just an append.
*/
bool mAppend;
/**
* The offset in the text where the change occurred.
*/
uint32_t mChangeStart;
/**
* The offset such that mChangeEnd - mChangeStart is equal to the length of
* the text we removed. If this was a pure insert or append, this is equal to
* mChangeStart.
*/
uint32_t mChangeEnd;
/**
* The length of the text that was inserted in place of the removed text. If
* this was a pure text removal, this is 0.
*/
uint32_t mReplaceLength;
/**
* The net result is that mChangeStart characters at the beginning of the
* text remained as they were. The next mChangeEnd - mChangeStart characters
* were removed, and mReplaceLength characters were inserted in their place.
* The text that used to begin at mChangeEnd now begins at
* mChangeStart + mReplaceLength.
*/
struct MOZ_STACK_CLASS Details {
enum {
eMerge, // two text nodes are merged as a result of normalize()
eSplit // a text node is split as a result of splitText()
} mType;
/**
* For eMerge it's the text node that will be removed, for eSplit it's the
* new text node.
*/
nsIContent* MOZ_NON_OWNING_REF mNextSibling;
};
/**
* Used for splitText() and normalize(), otherwise null.
*/
Details* mDetails;
};
/**
* Mutation observer interface
*
* See nsINode::AddMutationObserver, nsINode::RemoveMutationObserver for how to
* attach or remove your observers.
*
* WARNING: During these notifications, you are not allowed to perform
* any mutations to the current or any other document, or start a
* network load. If you need to perform such operations do that
* during the _last_ nsIDocumentObserver::EndUpdate notification. The
* expection for this is ParentChainChanged, where mutations should be
* done from an async event, as the notification might not be
* surrounded by BeginUpdate/EndUpdate calls.
*/
class nsIMutationObserver : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IMUTATION_OBSERVER_IID)
/**
* Notification that the node value of a data node (text, cdata, pi, comment)
* will be changed.
*
* This notification is not sent when a piece of content is
* added/removed from the document (the other notifications are used
* for that).
*
* @param aDocument The owner-document of aContent. Can be null.
* @param aContent The piece of content that changed. Is never null.
* @param aInfo The structure with information details about the change.
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void CharacterDataWillChange(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo) = 0;
/**
* Notification that the node value of a data node (text, cdata, pi, comment)
* has changed.
*
* This notification is not sent when a piece of content is
* added/removed from the document (the other notifications are used
* for that).
*
* @param aDocument The owner-document of aContent. Can be null.
* @param aContent The piece of content that changed. Is never null.
* @param aInfo The structure with information details about the change.
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void CharacterDataChanged(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo) = 0;
/**
* Notification that an attribute of an element will change. This
* can happen before the BeginUpdate for the change and may not
* always be followed by an AttributeChanged (in particular, if the
* attribute doesn't actually change there will be no corresponding
* AttributeChanged).
*
* @param aDocument The owner-document of aContent. Can be null.
* @param aContent The element whose attribute will change
* @param aNameSpaceID The namespace id of the changing attribute
* @param aAttribute The name of the changing attribute
* @param aModType Whether or not the attribute will be added, changed, or
* removed. The constants are defined in
* nsIDOMMutationEvent.h.
* @param aNewValue The new value, IF it has been preparsed by
* BeforeSetAttr, otherwise null.
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void AttributeWillChange(nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue) = 0;
/**
* Notification that an attribute of an element has changed.
*
* @param aDocument The owner-document of aContent. Can be null.
* @param aElement The element whose attribute changed
* @param aNameSpaceID The namespace id of the changed attribute
* @param aAttribute The name of the changed attribute
* @param aModType Whether or not the attribute was added, changed, or
* removed. The constants are defined in
* nsIDOMMutationEvent.h.
* @param aOldValue The old value, if either the old value or the new
* value are StoresOwnData() (or absent); null otherwise.
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void AttributeChanged(nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue) = 0;
/**
* Notification that the root of a native anonymous has been added
* or removed.
*
* @param aDocument Owner doc of aContent
* @param aContent Anonymous node that's been added or removed
* @param aIsRemove True if it's a removal, false if an addition
*/
virtual void NativeAnonymousChildListChange(nsIDocument* aDocument,
nsIContent* aContent,
bool aIsRemove) {}
/**
* Notification that an attribute of an element has been
* set to the value it already had.
*
* @param aDocument The owner-document of aContent.
* @param aElement The element whose attribute changed
* @param aNameSpaceID The namespace id of the changed attribute
* @param aAttribute The name of the changed attribute
*/
virtual void AttributeSetToCurrentValue(nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute) {}
/**
* Notification that one or more content nodes have been appended to the
* child list of another node in the tree.
*
* @param aDocument The owner-document of aContent. Can be null.
* @param aContainer The container that had new children appended. Is never
* null.
* @param aFirstNewContent the node at aIndexInContainer in aContainer.
* @param aNewIndexInContainer the index in the container of the first
* new child
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer) = 0;
/**
* Notification that a content node has been inserted as child to another
* node in the tree.
*
* @param aDocument The owner-document of aContent, or, when aContainer
* is null, the container that had the child inserted.
* Can be null.
* @param aContainer The container that had new a child inserted. Can be
* null to indicate that the child was inserted into
* aDocument
* @param aChild The newly inserted child.
* @param aIndexInContainer The index in the container of the new child.
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void ContentInserted(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer) = 0;
/**
* Notification that a content node has been removed from the child list of
* another node in the tree.
*
* @param aDocument The owner-document of aContent, or, when aContainer
* is null, the container that had the child removed.
* Can be null.
* @param aContainer The container that had new a child removed. Can be
* null to indicate that the child was removed from
* aDocument.
* @param aChild The child that was removed.
* @param aIndexInContainer The index in the container which the child used
* to have.
* @param aPreviousSibling The previous sibling to the child that was removed.
* Can be null if there was no previous sibling.
*
* @note Callers of this method might not hold a strong reference to the
* observer. The observer is responsible for making sure it stays
* alive for the duration of the call as needed. The observer may
* assume that this call will happen when there are script blockers on
* the stack.
*/
virtual void ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling) = 0;
/**
* The node is in the process of being destroyed. Calling QI on the node is
* not supported, however it is possible to get children and flags through
* nsINode as well as calling IsNodeOfType(eCONTENT) and casting to
* nsIContent to get attributes.
*
* NOTE: This notification is only called on observers registered directly
* on the node. This is because when the node is destroyed it can not have
* any ancestors. If you want to know when a descendant node is being
* removed from the observed node, use the ContentRemoved notification.
*
* @param aNode The node being destroyed.
*
* @note Callers of this method might not hold a strong reference to
* the observer. The observer is responsible for making sure it
* stays alive for the duration of the call as needed.
*/
virtual void NodeWillBeDestroyed(const nsINode *aNode) = 0;
/**
* Notification that the node's parent chain has changed. This
* happens when either the node or one of its ancestors is inserted
* or removed as a child of another node.
*
* Note that when a node is inserted this notification is sent to
* all descendants of that node, since all such nodes have their
* parent chain changed.
*
* @param aContent The piece of content that had its parent changed.
*
* @note Callers of this method might not hold a strong reference to
* the observer. The observer is responsible for making sure it
* stays alive for the duration of the call as needed.
*/
virtual void ParentChainChanged(nsIContent *aContent) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIMutationObserver, NS_IMUTATION_OBSERVER_IID)
#define NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE \
virtual void CharacterDataWillChange(nsIDocument* aDocument, \
nsIContent* aContent, \
CharacterDataChangeInfo* aInfo) override;
#define NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED \
virtual void CharacterDataChanged(nsIDocument* aDocument, \
nsIContent* aContent, \
CharacterDataChangeInfo* aInfo) override;
#define NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE \
virtual void AttributeWillChange(nsIDocument* aDocument, \
mozilla::dom::Element* aElement, \
int32_t aNameSpaceID, \
nsIAtom* aAttribute, \
int32_t aModType, \
const nsAttrValue* aNewValue) override;
#define NS_DECL_NSIMUTATIONOBSERVER_NATIVEANONYMOUSCHILDLISTCHANGE \
virtual void NativeAnonymousChildListChange(nsIDocument* aDocument, \
nsIContent* aContent, \
bool aIsRemove) override;
#define NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED \
virtual void AttributeChanged(nsIDocument* aDocument, \
mozilla::dom::Element* aElement, \
int32_t aNameSpaceID, \
nsIAtom* aAttribute, \
int32_t aModType, \
const nsAttrValue* aOldValue) override;
#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED \
virtual void ContentAppended(nsIDocument* aDocument, \
nsIContent* aContainer, \
nsIContent* aFirstNewContent, \
int32_t aNewIndexInContainer) override;
#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED \
virtual void ContentInserted(nsIDocument* aDocument, \
nsIContent* aContainer, \
nsIContent* aChild, \
int32_t aIndexInContainer) override;
#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED \
virtual void ContentRemoved(nsIDocument* aDocument, \
nsIContent* aContainer, \
nsIContent* aChild, \
int32_t aIndexInContainer, \
nsIContent* aPreviousSibling) override;
#define NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED \
virtual void NodeWillBeDestroyed(const nsINode* aNode) override;
#define NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED \
virtual void ParentChainChanged(nsIContent *aContent) override;
#define NS_DECL_NSIMUTATIONOBSERVER \
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE \
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED \
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE \
NS_DECL_NSIMUTATIONOBSERVER_NATIVEANONYMOUSCHILDLISTCHANGE \
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED \
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED \
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED \
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED \
NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED \
NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
#define NS_IMPL_NSIMUTATIONOBSERVER_CORE_STUB(_class) \
void \
_class::NodeWillBeDestroyed(const nsINode* aNode) \
{ \
}
#define NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(_class) \
void \
_class::CharacterDataWillChange(nsIDocument* aDocument, \
nsIContent* aContent, \
CharacterDataChangeInfo* aInfo) \
{ \
} \
void \
_class::CharacterDataChanged(nsIDocument* aDocument, \
nsIContent* aContent, \
CharacterDataChangeInfo* aInfo) \
{ \
} \
void \
_class::AttributeWillChange(nsIDocument* aDocument, \
mozilla::dom::Element* aElement, \
int32_t aNameSpaceID, \
nsIAtom* aAttribute, \
int32_t aModType, \
const nsAttrValue* aNewValue) \
{ \
} \
void \
_class::NativeAnonymousChildListChange(nsIDocument* aDocument, \
nsIContent* aContent, \
bool aIsRemove) \
{ \
} \
void \
_class::AttributeChanged(nsIDocument* aDocument, \
mozilla::dom::Element* aElement, \
int32_t aNameSpaceID, \
nsIAtom* aAttribute, \
int32_t aModType, \
const nsAttrValue* aOldValue) \
{ \
} \
void \
_class::ContentAppended(nsIDocument* aDocument, \
nsIContent* aContainer, \
nsIContent* aFirstNewContent, \
int32_t aNewIndexInContainer) \
{ \
} \
void \
_class::ContentInserted(nsIDocument* aDocument, \
nsIContent* aContainer, \
nsIContent* aChild, \
int32_t aIndexInContainer) \
{ \
} \
void \
_class::ContentRemoved(nsIDocument* aDocument, \
nsIContent* aContainer, \
nsIContent* aChild, \
int32_t aIndexInContainer, \
nsIContent* aPreviousSibling) \
{ \
} \
void \
_class::ParentChainChanged(nsIContent *aContent) \
{ \
}
#endif /* nsIMutationObserver_h */
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