gecko-dev/content/events/public/nsPIDOMEventTarget.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.org.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Olli Pettay <Olli.Pettay@helsinki.fi> (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 nsPIDOMEventTarget_h_
#define nsPIDOMEventTarget_h_
#include "nsISupports.h"
#include "nsEvent.h"
class nsIDOMEvent;
class nsPresContext;
class nsEventChainPreVisitor;
class nsEventChainPostVisitor;
class nsIEventListenerManager;
class nsIDOMEventListener;
class nsIDOMEventGroup;
class nsIScriptContext;
// e6579895-a23c-4afc-872a-d53da71def5d
#define NS_PIDOMEVENTTARGET_IID \
{ 0xe6579895, 0xa23c, 0x4afc, \
{ 0x87, 0x2a, 0xd5, 0x3d, 0xa7, 0x1d, 0xef, 0x5d } }
class nsPIDOMEventTarget : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_PIDOMEVENTTARGET_IID)
/**
* Returns the nsPIDOMEventTarget object which should be used as the target
* of DOMEvents.
* Usually |this| is returned, but for example global object returns
* the outer object.
*/
virtual nsPIDOMEventTarget* GetTargetForDOMEvent() { return this; }
/**
* Returns the nsPIDOMEventTarget object which should be used as the target
* of the event and when constructing event target chain.
* Usually |this| is returned, but for example global object returns
* the inner object.
*/
virtual nsPIDOMEventTarget* GetTargetForEventTargetChain() { return this; }
/**
* 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;
/**
* If nsEventChainPreVisitor.mWantsWillHandleEvent is set PR_TRUE,
* called just before possible event handlers on this object will be called.
*/
virtual nsresult WillHandleEvent(nsEventChainPostVisitor& aVisitor)
{
return NS_OK;
}
/**
* 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 aMayCreate If PR_FALSE, returns a listener manager only if
* one already exists.
*/
virtual nsIEventListenerManager* GetListenerManager(PRBool aMayCreate) = 0;
/**
* Add an event listener for nsIID.
*/
virtual nsresult AddEventListenerByIID(nsIDOMEventListener *aListener,
const nsIID& aIID) = 0;
/**
* Remove event listener for nsIID.
*/
virtual nsresult RemoveEventListenerByIID(nsIDOMEventListener *aListener,
const nsIID& aIID) = 0;
/**
* Get the system event group.
*/
virtual nsresult GetSystemEventGroup(nsIDOMEventGroup** aGroup) = 0;
/**
* Get the script context in which the event handlers should be run.
* May return null.
* @note Caller *must* check the value of aRv.
*/
virtual nsIScriptContext* GetContextForEventHandlers(nsresult* aRv) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsPIDOMEventTarget, NS_PIDOMEVENTTARGET_IID)
#endif // !defined(nsPIDOMEventTarget_h_)