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gecko-dev/content/base/public/nsINode.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.org code.
*
* The Initial Developer of the Original Code is Mozilla.com.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Boris Zbarsky <bzbarsky@mit.edu> (Original Author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsINode_h___
#define nsINode_h___
#include "nsIDOMGCParticipant.h"
#include "nsEvent.h"
#include "nsPropertyTable.h"
#include "nsTObserverArray.h"
#include "nsINodeInfo.h"
#include "nsCOMPtr.h"
class nsIContent;
class nsIDocument;
class nsIDOMEvent;
class nsPresContext;
class nsEventChainPreVisitor;
class nsEventChainPostVisitor;
class nsIEventListenerManager;
class nsIPrincipal;
class nsVoidArray;
class nsIMutationObserver;
// This bit will be set if the node doesn't have nsSlots
#define NODE_DOESNT_HAVE_SLOTS 0x00000001U
// This bit will be set if the node has a listener manager in the listener
// manager hash
#define NODE_HAS_LISTENERMANAGER 0x00000002U
// Whether this node has had any properties set on it
#define NODE_HAS_PROPERTIES 0x00000004U
// Whether this node is anonymous
// NOTE: Should only be used on nsIContent nodes
#define NODE_IS_ANONYMOUS 0x00000008U
// Whether this node is anonymous for events
// NOTE: Should only be used on nsIContent nodes
#define NODE_IS_ANONYMOUS_FOR_EVENTS 0x00000010U
// Whether this node may have a frame
// NOTE: Should only be used on nsIContent nodes
#define NODE_MAY_HAVE_FRAME 0x00000020U
// Four bits for the script-type ID
#define NODE_SCRIPT_TYPE_OFFSET 6
// Remaining bits are node type specific.
#define NODE_TYPE_SPECIFIC_BITS_OFFSET 0x0a
// Useful macro for getting a node given an nsIContent and an nsIDocument
// Returns the first argument cast to nsINode if it is non-null, otherwise
// returns the second (which may be null)
#define NODE_FROM(content_, document_) \
((content_) ? NS_STATIC_CAST(nsINode*, (content_)) : \
NS_STATIC_CAST(nsINode*, (document_)))
// IID for the nsINode interface
#define NS_INODE_IID \
{ 0x3d3a28b7, 0x6666, 0x4f93, \
{ 0xb7, 0xe7, 0xa9, 0x56, 0xd5, 0xaf, 0xf7, 0x57 } }
// hack to make egcs / gcc 2.95.2 happy
class nsINode_base : public nsIDOMGCParticipant {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID)
};
/**
* An internal interface that abstracts some DOMNode-related parts that both
* nsIContent and nsIDocument share. An instance of this interface has a list
* of nsIContent children and provides access to them.
*/
class nsINode : public nsINode_base {
public:
friend class nsNodeUtils;
#ifdef MOZILLA_INTERNAL_API
nsINode(nsINodeInfo* aNodeInfo)
: mNodeInfo(aNodeInfo),
mParentPtrBits(0),
mFlagsOrSlots(NODE_DOESNT_HAVE_SLOTS)
{
}
#endif
virtual ~nsINode();
/**
* Bit-flags to pass (or'ed together) to IsNodeOfType()
*/
enum {
/** nsIContent nodes */
eCONTENT = 1 << 0,
/** nsIDocument nodes */
eDOCUMENT = 1 << 1,
/** nsIAttribute nodes */
eATTRIBUTE = 1 << 2,
/** elements */
eELEMENT = 1 << 3,
/** text nodes */
eTEXT = 1 << 4,
/** xml processing instructions */
ePROCESSING_INSTRUCTION = 1 << 5,
/** comment nodes */
eCOMMENT = 1 << 6,
/** html elements */
eHTML = 1 << 7,
/** form control elements */
eHTML_FORM_CONTROL = 1 << 8,
/** XUL elements */
eXUL = 1 << 9,
/** svg elements */
eSVG = 1 << 10,
/** document fragments */
eDOCUMENT_FRAGMENT = 1 << 11,
/** data nodes (comments, PIs, text). Nodes of this type always
returns a non-null value for nsIContent::GetText() */
eDATA_NODE = 1 << 12
};
/**
* API for doing a quick check if a content is of a given
* type, such as HTML, XUL, Text, ... Use this when you can instead of
* checking the tag.
*
* @param aFlags what types you want to test for (see above)
* @return whether the content matches ALL flags passed in
*/
virtual PRBool IsNodeOfType(PRUint32 aFlags) const = 0;
/**
* Get the number of children
* @return the number of children
*/
virtual PRUint32 GetChildCount() const = 0;
/**
* Get a child by index
* @param aIndex the index of the child to get
* @return the child, or null if index out of bounds
*/
virtual nsIContent* GetChildAt(PRUint32 aIndex) const = 0;
/**
* Get the index of a child within this content
* @param aPossibleChild the child to get the index of.
* @return the index of the child, or -1 if not a child
*
* If the return value is not -1, then calling GetChildAt() with that value
* will return aPossibleChild.
*/
virtual PRInt32 IndexOf(nsINode* aPossibleChild) const = 0;
/**
* Return the "owner document" of this node. Note that this is not the same
* as the DOM ownerDocument -- that's null for Document nodes, whereas for a
* nsIDocument GetOwnerDocument returns the document itself. For nsIContent
* implementations the two are the same.
*/
nsIDocument *GetOwnerDoc() const
{
return mNodeInfo->GetDocument();
}
/**
* Returns true if the content has an ancestor that is a document.
*
* @return whether this content is in a document tree
*/
PRBool IsInDoc() const
{
return mParentPtrBits & PARENT_BIT_INDOCUMENT;
}
/**
* Get the document that this content is currently in, if any. This will be
* null if the content has no ancestor that is a document.
*
* @return the current document
*/
nsIDocument *GetCurrentDoc() const
{
return IsInDoc() ? GetOwnerDoc() : nsnull;
}
/**
* Insert a content node at a particular index. This method handles calling
* BindToTree on the child appropriately.
*
* @param aKid the content to insert
* @param aIndex the index it is being inserted at (the index it will have
* after it is inserted)
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the insert has
* occurred
*
* @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
* than one element node as a child of a document. Doing this will also
* assert -- you shouldn't be doing it! Check with
* nsIDocument::GetRootContent() first if you're not sure. Apart from this
* one constraint, this doesn't do any checking on whether aKid is a valid
* child of |this|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
virtual nsresult InsertChildAt(nsIContent* aKid, PRUint32 aIndex,
PRBool aNotify) = 0;
/**
* Append a content node to the end of the child list. This method handles
* calling BindToTree on the child appropriately.
*
* @param aKid the content to append
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the append has
* occurred
*
* @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
* than one element node as a child of a document. Doing this will also
* assert -- you shouldn't be doing it! Check with
* nsIDocument::GetRootContent() first if you're not sure. Apart from this
* one constraint, this doesn't do any checking on whether aKid is a valid
* child of |this|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
nsresult AppendChildTo(nsIContent* aKid, PRBool aNotify)
{
return InsertChildAt(aKid, GetChildCount(), aNotify);
}
/**
* Remove a child from this node. This method handles calling UnbindFromTree
* on the child appropriately.
*
* @param aIndex the index of the child to remove
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the remove has
* occurred
*
* Note: If there is no child at aIndex, this method will simply do nothing.
*/
virtual nsresult RemoveChildAt(PRUint32 aIndex, PRBool aNotify) = 0;
/**
* Get a property associated with this node.
*
* @param aPropertyName name of property to get.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
void* GetProperty(nsIAtom *aPropertyName,
nsresult *aStatus = nsnull) const
{
return GetProperty(0, aPropertyName, aStatus);
}
/**
* Get a property associated with this node.
*
* @param aCategory category of property to get.
* @param aPropertyName name of property to get.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
virtual void* GetProperty(PRUint16 aCategory,
nsIAtom *aPropertyName,
nsresult *aStatus = nsnull) const;
/**
* Set a property to be associated with this node. This will overwrite an
* existing value if one exists. The existing value is destroyed using the
* destructor function given when that value was set.
*
* @param aPropertyName name of property to set.
* @param aValue new value of property.
* @param aDtor destructor function to be used when this property
* is destroyed.
* @param aTransfer if PR_TRUE the property will not be deleted when the
* ownerDocument of the node changes, if PR_FALSE it
* will be deleted.
*
* @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
* was already set
* @throws NS_ERROR_OUT_OF_MEMORY if that occurs
*/
nsresult SetProperty(nsIAtom *aPropertyName,
void *aValue,
NSPropertyDtorFunc aDtor = nsnull,
PRBool aTransfer = PR_FALSE)
{
return SetProperty(0, aPropertyName, aValue, aDtor, aTransfer);
}
/**
* Set a property to be associated with this node. This will overwrite an
* existing value if one exists. The existing value is destroyed using the
* destructor function given when that value was set.
*
* @param aCategory category of property to set.
* @param aPropertyName name of property to set.
* @param aValue new value of property.
* @param aDtor destructor function to be used when this property
* is destroyed.
* @param aTransfer if PR_TRUE the property will not be deleted when the
* ownerDocument of the node changes, if PR_FALSE it
* will be deleted.
* @param aOldValue [out] previous value of property.
*
* @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
* was already set
* @throws NS_ERROR_OUT_OF_MEMORY if that occurs
*/
virtual nsresult SetProperty(PRUint16 aCategory,
nsIAtom *aPropertyName,
void *aValue,
NSPropertyDtorFunc aDtor = nsnull,
PRBool aTransfer = PR_FALSE,
void **aOldValue = nsnull);
/**
* Destroys a property associated with this node. The value is destroyed
* using the destruction function given when that value was set.
*
* @param aPropertyName name of property to destroy.
*
* @throws NS_PROPTABLE_PROP_NOT_THERE if the property was not set
*/
nsresult DeleteProperty(nsIAtom *aPropertyName)
{
return DeleteProperty(0, aPropertyName);
}
/**
* Destroys a property associated with this node. The value is destroyed
* using the destruction function given when that value was set.
*
* @param aCategory category of property to destroy.
* @param aPropertyName name of property to destroy.
*
* @throws NS_PROPTABLE_PROP_NOT_THERE if the property was not set
*/
virtual nsresult DeleteProperty(PRUint16 aCategory, nsIAtom *aPropertyName);
/**
* Unset a property associated with this node. The value will not be
* destroyed but rather returned. It is the caller's responsibility to
* destroy the value after that point.
*
* @param aPropertyName name of property to unset.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
void* UnsetProperty(nsIAtom *aPropertyName,
nsresult *aStatus = nsnull)
{
return UnsetProperty(0, aPropertyName, aStatus);
}
/**
* Unset a property associated with this node. The value will not be
* destroyed but rather returned. It is the caller's responsibility to
* destroy the value after that point.
*
* @param aCategory category of property to unset.
* @param aPropertyName name of property to unset.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
virtual void* UnsetProperty(PRUint16 aCategory,
nsIAtom *aPropertyName,
nsresult *aStatus = nsnull);
PRBool HasProperties() const
{
return HasFlag(NODE_HAS_PROPERTIES);
}
/**
* Return the principal of this node. This is guaranteed to never be a null
* pointer.
*/
nsIPrincipal* NodePrincipal() const {
return mNodeInfo->NodeInfoManager()->DocumentPrincipal();
}
/**
* Called before the capture phase of the event flow.
* This is used to create the event target chain and implementations
* should set the necessary members of nsEventChainPreVisitor.
* At least aVisitor.mCanHandle must be set,
* usually also aVisitor.mParentTarget if mCanHandle is PR_TRUE.
* First one tells that this object can handle the aVisitor.mEvent event and
* the latter one is the possible parent object for the event target chain.
* @see nsEventDispatcher.h for more documentation about aVisitor.
*
* @param aVisitor the visitor object which is used to create the
* event target chain for event dispatching.
*
* @note Only nsEventDispatcher should call this method.
*/
virtual nsresult PreHandleEvent(nsEventChainPreVisitor& aVisitor) = 0;
/**
* Called after the bubble phase of the system event group.
* The default handling of the event should happen here.
* @param aVisitor the visitor object which is used during post handling.
*
* @see nsEventDispatcher.h for documentation about aVisitor.
* @note Only nsEventDispatcher should call this method.
*/
virtual nsresult PostHandleEvent(nsEventChainPostVisitor& aVisitor) = 0;
/**
* Dispatch an event.
* @param aEvent the event that is being dispatched.
* @param aDOMEvent the event that is being dispatched, use if you want to
* dispatch nsIDOMEvent, not only nsEvent.
* @param aPresContext the current presentation context, can be nsnull.
* @param aEventStatus the status returned from the function, can be nsnull.
*
* @note If both aEvent and aDOMEvent are used, aEvent must be the internal
* event of the aDOMEvent.
*
* If aDOMEvent is not nsnull (in which case aEvent can be nsnull) it is used
* for dispatching, otherwise aEvent is used.
*
* @deprecated This method is here just until all the callers outside Gecko
* have been converted to use nsIDOMEventTarget::dispatchEvent.
*/
virtual nsresult DispatchDOMEvent(nsEvent* aEvent,
nsIDOMEvent* aDOMEvent,
nsPresContext* aPresContext,
nsEventStatus* aEventStatus) = 0;
/**
* Get the event listener manager, the guy you talk to to register for events
* on this node.
* @param aCreateIfNotFound If PR_FALSE, returns a listener manager only if
* one already exists. [IN]
* @param aResult The event listener manager [OUT]
*/
NS_IMETHOD GetListenerManager(PRBool aCreateIfNotFound,
nsIEventListenerManager** aResult);
/**
* Get the parent nsIContent for this node.
* @return the parent, or null if no parent or the parent is not an nsIContent
*/
nsIContent* GetParent() const
{
return NS_LIKELY(mParentPtrBits & PARENT_BIT_PARENT_IS_CONTENT) ?
NS_REINTERPRET_CAST(nsIContent*,
mParentPtrBits & ~kParentBitMask) :
nsnull;
}
/**
* Get the parent nsINode for this node. This can be either an nsIContent,
* an nsIDocument or an nsIAttribute.
* @return the parent node
*/
nsINode* GetNodeParent() const
{
return NS_REINTERPRET_CAST(nsINode*, mParentPtrBits & ~kParentBitMask);
}
/**
* Adds a mutation observer to be notified when this node, or any of its
* descendants, are modified. The node will hold a weak reference to the
* observer, which means that it is the responsibility of the observer to
* remove itself in case it dies before the node.
*/
virtual void AddMutationObserver(nsIMutationObserver* aMutationObserver);
/**
* Removes a mutation observer.
*/
virtual void RemoveMutationObserver(nsIMutationObserver* aMutationObserver);
/**
* Clones this node. This needs to be overriden by all node classes. aNodeInfo
* should be identical to this node's nodeInfo, except for the document which
* may be different. When cloning an element, all attributes of the element
* will be cloned. The children of the node will not be cloned.
*
* @param aNodeInfo the nodeinfo to use for the clone
* @param aResult the clone
*/
virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const = 0;
// This class can be extended by subclasses that wish to store more
// information in the slots.
class nsSlots
{
public:
nsSlots(PtrBits aFlags) : mFlags(aFlags)
{
}
// If needed we could remove the vtable pointer this dtor causes by
// putting a DestroySlots function on nsINode
virtual ~nsSlots()
{
}
/**
* Storage for flags for this node. These are the same flags as the
* mFlagsOrSlots member, but these are used when the slots class
* is allocated.
*/
PtrBits mFlags;
/**
* A list of mutation observers
*/
nsTObserverArray<nsIMutationObserver> mMutationObservers;
};
protected:
/**
* Functions for managing flags and slots
*/
// Override this function to create a custom slots class.
virtual nsINode::nsSlots* CreateSlots();
PRBool HasSlots() const
{
return !(mFlagsOrSlots & NODE_DOESNT_HAVE_SLOTS);
}
nsSlots* FlagsAsSlots() const
{
NS_ASSERTION(HasSlots(), "check HasSlots first");
return NS_REINTERPRET_CAST(nsSlots*, mFlagsOrSlots);
}
nsSlots* GetExistingSlots() const
{
return HasSlots() ? FlagsAsSlots() : nsnull;
}
nsSlots* GetSlots()
{
if (HasSlots()) {
return FlagsAsSlots();
}
nsSlots* slots = CreateSlots();
if (slots) {
mFlagsOrSlots = NS_REINTERPRET_CAST(PtrBits, slots);
}
return slots;
}
PtrBits GetFlags() const
{
return NS_UNLIKELY(HasSlots()) ? FlagsAsSlots()->mFlags : mFlagsOrSlots;
}
PRBool HasFlag(PtrBits aFlag) const
{
return !!(GetFlags() & aFlag);
}
void SetFlags(PtrBits aFlagsToSet)
{
NS_ASSERTION(!(aFlagsToSet & (NODE_IS_ANONYMOUS | NODE_MAY_HAVE_FRAME)) ||
IsNodeOfType(eCONTENT),
"Flag only permitted on nsIContent nodes");
PtrBits* flags = HasSlots() ? &FlagsAsSlots()->mFlags :
&mFlagsOrSlots;
*flags |= aFlagsToSet;
}
void UnsetFlags(PtrBits aFlagsToUnset)
{
PtrBits* flags = HasSlots() ? &FlagsAsSlots()->mFlags :
&mFlagsOrSlots;
*flags &= ~aFlagsToUnset;
}
nsCOMPtr<nsINodeInfo> mNodeInfo;
enum { PARENT_BIT_INDOCUMENT = 1 << 0, PARENT_BIT_PARENT_IS_CONTENT = 1 << 1 };
enum { kParentBitMask = 0x3 };
PtrBits mParentPtrBits;
/**
* Used for either storing flags for this node or a pointer to
* this contents nsContentSlots. See the definition of the
* NODE_* macros for the layout of the bits in this
* member.
*/
PtrBits mFlagsOrSlots;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsINode_base, NS_INODE_IID)
#endif /* nsINode_h___ */
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