nsNodeUtils.h
/* -*- 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 nsNodeUtils_h___
#define nsNodeUtils_h___
#include "nsIContent.h" // for use in inline function (ParentChainChanged)
#include "nsIMutationObserver.h" // for use in inline function (ParentChainChanged)
#include "js/TypeDecls.h"
#include "nsCOMArray.h"
struct CharacterDataChangeInfo;
template<class E> class nsCOMArray;
class nsCycleCollectionTraversalCallback;
namespace mozilla {
namespace dom {
class Animation;
} // namespace dom
} // namespace mozilla
class nsNodeUtils
{
public:
/**
* Send CharacterDataWillChange notifications to nsIMutationObservers.
* @param aContent Node whose data changed
* @param aInfo Struct with information details about the change
* @see nsIMutationObserver::CharacterDataWillChange
*/
static void CharacterDataWillChange(nsIContent* aContent,
CharacterDataChangeInfo* aInfo);
/**
* Send CharacterDataChanged notifications to nsIMutationObservers.
* @param aContent Node whose data changed
* @param aInfo Struct with information details about the change
* @see nsIMutationObserver::CharacterDataChanged
*/
static void CharacterDataChanged(nsIContent* aContent,
CharacterDataChangeInfo* aInfo);
/**
* Send AttributeWillChange notifications to nsIMutationObservers.
* @param aElement Element whose data will change
* @param aNameSpaceID Namespace of changing attribute
* @param aAttribute Local-name of changing attribute
* @param aModType Type of change (add/change/removal)
* @param aNewValue The parsed new value, but only if BeforeSetAttr
* preparsed it!!!
* @see nsIMutationObserver::AttributeWillChange
*/
static void AttributeWillChange(mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue);
/**
* Send AttributeChanged notifications to nsIMutationObservers.
* @param aElement Element whose data changed
* @param aNameSpaceID Namespace of changed attribute
* @param aAttribute Local-name of changed attribute
* @param aModType Type of change (add/change/removal)
* @param aOldValue If the old value was StoresOwnData() (or absent),
* that value, otherwise null
* @see nsIMutationObserver::AttributeChanged
*/
static void AttributeChanged(mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue);
/**
* Send AttributeSetToCurrentValue notifications to nsIMutationObservers.
* @param aElement Element whose data changed
* @param aNameSpaceID Namespace of the attribute
* @param aAttribute Local-name of the attribute
* @see nsIMutationObserver::AttributeSetToCurrentValue
*/
static void AttributeSetToCurrentValue(mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute);
/**
* Send ContentAppended notifications to nsIMutationObservers
* @param aContainer Node into which new child/children were added
* @param aFirstNewContent First new child
* @param aNewIndexInContainer Index of first new child
* @see nsIMutationObserver::ContentAppended
*/
static void ContentAppended(nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer);
/**
* Send NativeAnonymousChildList notifications to nsIMutationObservers
* @param aContent Anonymous node that's been added or removed
* @param aIsRemove True if it's a removal, false if an addition
* @see nsIMutationObserver::NativeAnonymousChildListChange
*/
static void NativeAnonymousChildListChange(nsIContent* aContent,
bool aIsRemove);
/**
* Send ContentInserted notifications to nsIMutationObservers
* @param aContainer Node into which new child was inserted
* @param aChild Newly inserted child
* @param aIndexInContainer Index of new child
* @see nsIMutationObserver::ContentInserted
*/
static void ContentInserted(nsINode* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer);
/**
* Send ContentRemoved notifications to nsIMutationObservers
* @param aContainer Node from which child was removed
* @param aChild Removed child
* @param aIndexInContainer Index of removed child
* @see nsIMutationObserver::ContentRemoved
*/
static void ContentRemoved(nsINode* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling);
/**
* Send ParentChainChanged notifications to nsIMutationObservers
* @param aContent The piece of content that had its parent changed.
* @see nsIMutationObserver::ParentChainChanged
*/
static inline void ParentChainChanged(nsIContent *aContent)
{
nsINode::nsSlots* slots = aContent->GetExistingSlots();
if (slots && !slots->mMutationObservers.IsEmpty()) {
NS_OBSERVER_ARRAY_NOTIFY_OBSERVERS(slots->mMutationObservers,
nsIMutationObserver,
ParentChainChanged,
(aContent));
}
}
static mozilla::dom::Element*
GetTargetForAnimation(const mozilla::dom::Animation* aAnimation);
static void AnimationAdded(mozilla::dom::Animation* aAnimation);
static void AnimationChanged(mozilla::dom::Animation* aAnimation);
static void AnimationRemoved(mozilla::dom::Animation* aAnimation);
/**
* To be called when reference count of aNode drops to zero.
* @param aNode The node which is going to be deleted.
*/
static void LastRelease(nsINode* aNode);
/**
* Clones aNode, its attributes and, if aDeep is true, its descendant nodes
* If aNewNodeInfoManager is not null, it is used to create new nodeinfos for
* the clones. aNodesWithProperties will be filled with all the nodes that
* have properties, and every node in it will be followed by its clone.
*
* @param aNode Node to clone.
* @param aDeep If true the function will be called recursively on
* descendants of the node
* @param aNewNodeInfoManager The nodeinfo manager to use to create new
* nodeinfos for aNode and its attributes and
* descendants. May be null if the nodeinfos
* shouldn't be changed.
* @param aNodesWithProperties All nodes (from amongst aNode and its
* descendants) with properties. Every node will
* be followed by its clone.
* @param aResult *aResult will contain the cloned node.
*/
static nsresult Clone(nsINode *aNode, bool aDeep,
nsNodeInfoManager *aNewNodeInfoManager,
nsCOMArray<nsINode> &aNodesWithProperties,
nsINode **aResult)
{
return CloneAndAdopt(aNode, true, aDeep, aNewNodeInfoManager,
nullptr, aNodesWithProperties, nullptr, aResult);
}
/**
* Clones aNode, its attributes and, if aDeep is true, its descendant nodes
*/
static nsresult Clone(nsINode *aNode, bool aDeep, nsINode **aResult)
{
nsCOMArray<nsINode> dummyNodeWithProperties;
return CloneAndAdopt(aNode, true, aDeep, nullptr, nullptr,
dummyNodeWithProperties, aNode->GetParent(), aResult);
}
/**
* Walks aNode, its attributes and descendant nodes. If aNewNodeInfoManager is
* not null, it is used to create new nodeinfos for the nodes. Also reparents
* the XPConnect wrappers for the nodes into aReparentScope if non-null.
* aNodesWithProperties will be filled with all the nodes that have
* properties.
*
* @param aNode Node to adopt.
* @param aNewNodeInfoManager The nodeinfo manager to use to create new
* nodeinfos for aNode and its attributes and
* descendants. May be null if the nodeinfos
* shouldn't be changed.
* @param aReparentScope New scope for the wrappers, or null if no reparenting
* should be done.
* @param aNodesWithProperties All nodes (from amongst aNode and its
* descendants) with properties.
*/
static nsresult Adopt(nsINode *aNode, nsNodeInfoManager *aNewNodeInfoManager,
JS::Handle<JSObject*> aReparentScope,
nsCOMArray<nsINode> &aNodesWithProperties)
{
nsCOMPtr<nsINode> node;
nsresult rv = CloneAndAdopt(aNode, false, true, aNewNodeInfoManager,
aReparentScope, aNodesWithProperties,
nullptr, getter_AddRefs(node));
nsMutationGuard::DidMutate();
return rv;
}
/**
* Helper for the cycle collector to traverse the DOM UserData for aNode.
*
* @param aNode the node to traverse UserData for
* @param aCb the cycle collection callback
*/
static void TraverseUserData(nsINode* aNode,
nsCycleCollectionTraversalCallback &aCb);
/**
* A basic implementation of the DOM cloneNode method. Calls nsINode::Clone to
* do the actual cloning of the node.
*
* @param aNode the node to clone
* @param aDeep if true all descendants will be cloned too
* @param aResult the clone
*/
static nsresult CloneNodeImpl(nsINode *aNode, bool aDeep, nsINode **aResult);
/**
* Release the UserData for aNode.
*
* @param aNode the node to release the UserData for
*/
static void UnlinkUserData(nsINode *aNode);
/**
* Returns a true if the node is a HTMLTemplate element.
*
* @param aNode a node to test for HTMLTemplate elementness.
*/
static bool IsTemplateElement(const nsINode *aNode);
/**
* Returns the first child of a node or the first child of
* a template element's content if the provided node is a
* template element.
*
* @param aNode A node from which to retrieve the first child.
*/
static nsIContent* GetFirstChildOfTemplateOrNode(nsINode* aNode);
private:
/**
* Walks aNode, its attributes and, if aDeep is true, its descendant nodes.
* If aClone is true the nodes will be cloned. If aNewNodeInfoManager is
* not null, it is used to create new nodeinfos for the nodes. Also reparents
* the XPConnect wrappers for the nodes into aReparentScope if non-null.
* aNodesWithProperties will be filled with all the nodes that have
* properties.
*
* @param aNode Node to adopt/clone.
* @param aClone If true the node will be cloned and the cloned node will
* be in aResult.
* @param aDeep If true the function will be called recursively on
* descendants of the node
* @param aNewNodeInfoManager The nodeinfo manager to use to create new
* nodeinfos for aNode and its attributes and
* descendants. May be null if the nodeinfos
* shouldn't be changed.
* @param aReparentScope Scope into which wrappers should be reparented, or
* null if no reparenting should be done.
* @param aNodesWithProperties All nodes (from amongst aNode and its
* descendants) with properties. If aClone is
* true every node will be followed by its
* clone.
* @param aParent If aClone is true the cloned node will be appended to
* aParent's children. May be null. If not null then aNode
* must be an nsIContent.
* @param aResult If aClone is true then *aResult will contain the cloned
* node.
*/
static nsresult CloneAndAdopt(nsINode *aNode, bool aClone, bool aDeep,
nsNodeInfoManager *aNewNodeInfoManager,
JS::Handle<JSObject*> aReparentScope,
nsCOMArray<nsINode> &aNodesWithProperties,
nsINode *aParent, nsINode **aResult);
};
#endif // nsNodeUtils_h___
