forked from mirrors/gecko-dev
372 lines
16 KiB
C++
372 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsIMutationObserver_h
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#define nsIMutationObserver_h
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#include "nsISupports.h"
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class nsAttrValue;
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class nsAtom;
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class nsIContent;
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class nsINode;
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namespace mozilla {
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namespace dom {
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class Element;
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} // namespace dom
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} // namespace mozilla
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#define NS_IMUTATION_OBSERVER_IID \
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{ \
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0x6d674c17, 0x0fbc, 0x4633, { \
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0x8f, 0x46, 0x73, 0x4e, 0x87, 0xeb, 0xf0, 0xc7 \
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} \
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}
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/**
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* Information details about a characterdata change. Basically, we
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* view all changes as replacements of a length of text at some offset
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* with some other text (of possibly some other length).
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*/
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struct CharacterDataChangeInfo {
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/**
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* True if this character data change is just an append.
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*/
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bool mAppend;
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/**
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* The offset in the text where the change occurred.
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*/
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uint32_t mChangeStart;
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/**
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* The offset such that mChangeEnd - mChangeStart is equal to the length of
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* the text we removed. If this was a pure insert or append, this is equal to
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* mChangeStart.
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*/
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uint32_t mChangeEnd;
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/**
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* The length of the text that was inserted in place of the removed text. If
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* this was a pure text removal, this is 0.
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*/
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uint32_t mReplaceLength;
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/**
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* The net result is that mChangeStart characters at the beginning of the
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* text remained as they were. The next mChangeEnd - mChangeStart characters
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* were removed, and mReplaceLength characters were inserted in their place.
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* The text that used to begin at mChangeEnd now begins at
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* mChangeStart + mReplaceLength.
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*/
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struct MOZ_STACK_CLASS Details {
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enum {
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eMerge, // two text nodes are merged as a result of normalize()
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eSplit // a text node is split as a result of splitText()
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} mType;
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/**
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* For eMerge it's the text node that will be removed, for eSplit it's the
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* new text node.
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*/
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nsIContent* MOZ_NON_OWNING_REF mNextSibling;
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};
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/**
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* Used for splitText() and normalize(), otherwise null.
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*/
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Details* mDetails;
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};
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/**
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* Mutation observer interface
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*
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* See nsINode::AddMutationObserver, nsINode::RemoveMutationObserver for how to
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* attach or remove your observers.
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*
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* WARNING: During these notifications, you are not allowed to perform
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* any mutations to the current or any other document, or start a
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* network load. If you need to perform such operations do that
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* during the _last_ nsIDocumentObserver::EndUpdate notification. The
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* expection for this is ParentChainChanged, where mutations should be
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* done from an async event, as the notification might not be
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* surrounded by BeginUpdate/EndUpdate calls.
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*/
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class nsIMutationObserver : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IMUTATION_OBSERVER_IID)
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/**
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* Notification that the node value of a data node (text, cdata, pi, comment)
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* will be changed.
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*
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* This notification is not sent when a piece of content is
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* added/removed from the document (the other notifications are used
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* for that).
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*
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* @param aContent The piece of content that changed. Is never null.
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* @param aInfo The structure with information details about the change.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void CharacterDataWillChange(nsIContent* aContent,
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const CharacterDataChangeInfo&) = 0;
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/**
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* Notification that the node value of a data node (text, cdata, pi, comment)
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* has changed.
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*
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* This notification is not sent when a piece of content is
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* added/removed from the document (the other notifications are used
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* for that).
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*
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* @param aContent The piece of content that changed. Is never null.
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* @param aInfo The structure with information details about the change.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void CharacterDataChanged(nsIContent* aContent,
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const CharacterDataChangeInfo&) = 0;
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/**
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* Notification that an attribute of an element will change. This
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* can happen before the BeginUpdate for the change and may not
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* always be followed by an AttributeChanged (in particular, if the
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* attribute doesn't actually change there will be no corresponding
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* AttributeChanged).
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*
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* @param aContent The element whose attribute will change
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* @param aNameSpaceID The namespace id of the changing attribute
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* @param aAttribute The name of the changing attribute
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* @param aModType Whether or not the attribute will be added, changed, or
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* removed. The constants are defined in
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* MutationEvent.webidl.
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* @param aNewValue The new value, IF it has been preparsed by
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* BeforeSetAttr, otherwise null.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void AttributeWillChange(mozilla::dom::Element* aElement,
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int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) = 0;
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/**
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* Notification that an attribute of an element has changed.
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*
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* @param aElement The element whose attribute changed
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* @param aNameSpaceID The namespace id of the changed attribute
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* @param aAttribute The name of the changed attribute
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* @param aModType Whether or not the attribute was added, changed, or
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* removed. The constants are defined in
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* MutationEvent.webidl.
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* @param aOldValue The old value, if either the old value or the new
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* value are StoresOwnData() (or absent); null otherwise.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void AttributeChanged(mozilla::dom::Element* aElement,
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int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType,
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const nsAttrValue* aOldValue) = 0;
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/**
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* Notification that the root of a native anonymous has been added
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* or removed.
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*
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* @param aContent Anonymous node that's been added or removed
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* @param aIsRemove True if it's a removal, false if an addition
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*/
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virtual void NativeAnonymousChildListChange(nsIContent* aContent,
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bool aIsRemove) {}
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/**
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* Notification that an attribute of an element has been
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* set to the value it already had.
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*
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* @param aElement The element whose attribute changed
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* @param aNameSpaceID The namespace id of the changed attribute
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* @param aAttribute The name of the changed attribute
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*/
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virtual void AttributeSetToCurrentValue(mozilla::dom::Element* aElement,
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int32_t aNameSpaceID,
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nsAtom* aAttribute) {}
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/**
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* Notification that one or more content nodes have been appended to the
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* child list of another node in the tree.
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*
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* @param aFirstNewContent the first node appended.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void ContentAppended(nsIContent* aFirstNewContent) = 0;
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/**
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* Notification that a content node has been inserted as child to another
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* node in the tree.
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*
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* @param aChild The newly inserted child.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void ContentInserted(nsIContent* aChild) = 0;
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/**
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* Notification that a content node has been removed from the child list of
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* another node in the tree.
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*
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* @param aChild The child that was removed.
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* @param aPreviousSibling The previous sibling to the child that was removed.
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* Can be null if there was no previous sibling.
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*
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* @note Callers of this method might not hold a strong reference to the
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* observer. The observer is responsible for making sure it stays
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* alive for the duration of the call as needed. The observer may
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* assume that this call will happen when there are script blockers on
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* the stack.
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*/
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virtual void ContentRemoved(nsIContent* aChild,
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nsIContent* aPreviousSibling) = 0;
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/**
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* The node is in the process of being destroyed. Calling QI on the node is
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* not supported, however it is possible to get children and flags through
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* nsINode as well as calling IsContent and casting to nsIContent to get
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* attributes.
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*
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* NOTE: This notification is only called on observers registered directly
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* on the node. This is because when the node is destroyed it can not have
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* any ancestors. If you want to know when a descendant node is being
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* removed from the observed node, use the ContentRemoved notification.
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*
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* @param aNode The node being destroyed.
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*
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* @note Callers of this method might not hold a strong reference to
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* the observer. The observer is responsible for making sure it
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* stays alive for the duration of the call as needed.
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*/
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virtual void NodeWillBeDestroyed(const nsINode* aNode) = 0;
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/**
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* Notification that the node's parent chain has changed. This
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* happens when either the node or one of its ancestors is inserted
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* or removed as a child of another node.
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*
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* Note that when a node is inserted this notification is sent to
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* all descendants of that node, since all such nodes have their
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* parent chain changed.
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*
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* @param aContent The piece of content that had its parent changed.
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*
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* @note Callers of this method might not hold a strong reference to
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* the observer. The observer is responsible for making sure it
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* stays alive for the duration of the call as needed.
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*/
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virtual void ParentChainChanged(nsIContent* aContent) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIMutationObserver, NS_IMUTATION_OBSERVER_IID)
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#define NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE \
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virtual void CharacterDataWillChange( \
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nsIContent* aContent, const CharacterDataChangeInfo& aInfo) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED \
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virtual void CharacterDataChanged( \
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nsIContent* aContent, const CharacterDataChangeInfo& aInfo) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE \
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virtual void AttributeWillChange(mozilla::dom::Element* aElement, \
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int32_t aNameSpaceID, nsAtom* aAttribute, \
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int32_t aModType) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_NATIVEANONYMOUSCHILDLISTCHANGE \
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virtual void NativeAnonymousChildListChange(nsIContent* aContent, \
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bool aIsRemove) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED \
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virtual void AttributeChanged(mozilla::dom::Element* aElement, \
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int32_t aNameSpaceID, nsAtom* aAttribute, \
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int32_t aModType, \
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const nsAttrValue* aOldValue) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED \
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virtual void ContentAppended(nsIContent* aFirstNewContent) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED \
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virtual void ContentInserted(nsIContent* aChild) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED \
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virtual void ContentRemoved(nsIContent* aChild, \
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nsIContent* aPreviousSibling) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED \
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virtual void NodeWillBeDestroyed(const nsINode* aNode) override;
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#define NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED \
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virtual void ParentChainChanged(nsIContent* aContent) override;
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#define NS_DECL_NSIMUTATIONOBSERVER \
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NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE \
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NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED \
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NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE \
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NS_DECL_NSIMUTATIONOBSERVER_NATIVEANONYMOUSCHILDLISTCHANGE \
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NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED \
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED \
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED \
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NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED \
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NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED \
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NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
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#define NS_IMPL_NSIMUTATIONOBSERVER_CORE_STUB(_class) \
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void _class::NodeWillBeDestroyed(const nsINode* aNode) {}
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#define NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(_class) \
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void _class::CharacterDataWillChange( \
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nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {} \
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void _class::CharacterDataChanged(nsIContent* aContent, \
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const CharacterDataChangeInfo& aInfo) {} \
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void _class::AttributeWillChange(mozilla::dom::Element* aElement, \
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int32_t aNameSpaceID, nsAtom* aAttribute, \
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int32_t aModType) {} \
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void _class::NativeAnonymousChildListChange(nsIContent* aContent, \
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bool aIsRemove) {} \
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void _class::AttributeChanged( \
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mozilla::dom::Element* aElement, int32_t aNameSpaceID, \
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nsAtom* aAttribute, int32_t aModType, const nsAttrValue* aOldValue) {} \
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void _class::ContentAppended(nsIContent* aFirstNewContent) {} \
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void _class::ContentInserted(nsIContent* aChild) {} \
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void _class::ContentRemoved(nsIContent* aChild, \
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nsIContent* aPreviousSibling) {} \
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void _class::ParentChainChanged(nsIContent* aContent) {}
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#endif /* nsIMutationObserver_h */
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