gecko/dom/base/nsIJSEventListener.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
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 nsIJSEventListener_h__
#define nsIJSEventListener_h__
#include "nsIScriptContext.h"
#include "jsapi.h"
#include "nsIDOMEventListener.h"
class nsIScriptObjectOwner;
class nsIAtom;
#define NS_IJSEVENTLISTENER_IID \
{ 0x92f9212b, 0xa6aa, 0x4867, \
{ 0x93, 0x8a, 0x56, 0xbe, 0x17, 0x67, 0x4f, 0xd4 } }
// Implemented by script event listeners. Used to retrieve the
// script object corresponding to the event target and the handler itself.
// (Note this interface is now used to store script objects for all
// script languages, so is no longer JS specific)
//
// Note, mTarget is a raw pointer and the owner of the nsIJSEventListener object
// is expected to call Disconnect()!
class nsIJSEventListener : public nsIDOMEventListener
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSEVENTLISTENER_IID)
nsIJSEventListener(nsIScriptContext* aContext, JSObject* aScopeObject,
nsISupports *aTarget, JSObject *aHandler)
: mContext(aContext), mScopeObject(aScopeObject), mHandler(aHandler)
{
nsCOMPtr<nsISupports> base = do_QueryInterface(aTarget);
mTarget = base.get();
}
nsIScriptContext *GetEventContext() const
{
return mContext;
}
nsISupports *GetEventTarget() const
{
return mTarget;
}
void Disconnect()
{
mTarget = nsnull;
}
JSObject* GetEventScope() const
{
return mScopeObject;
}
JSObject *GetHandler() const
{
return mHandler;
}
// Set a handler for this event listener. Must not be called if
// there is already a handler! The handler must already be bound to
// the right target.
virtual void SetHandler(JSObject *aHandler) = 0;
// Among the sub-classes that inherit (directly or indirectly) from nsINode,
// measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - nsIJSEventListener: mEventName
//
virtual size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
return 0;
// Measurement of the following members may be added later if DMD finds it
// is worthwhile:
// - mContext
// - mTarget
//
// The following members are not measured:
// - mScopeObject, mHandler: because they're measured by the JS memory
// reporters
}
virtual size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
protected:
virtual ~nsIJSEventListener()
{
NS_ASSERTION(!mTarget, "Should have called Disconnect()!");
}
nsCOMPtr<nsIScriptContext> mContext;
JSObject* mScopeObject;
nsISupports* mTarget;
JSObject *mHandler;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSEventListener, NS_IJSEVENTLISTENER_IID)
/* factory function. aHandler must already be bound to aTarget */
nsresult NS_NewJSEventListener(nsIScriptContext *aContext,
JSObject* aScopeObject, nsISupports* aTarget,
nsIAtom* aType, JSObject* aHandler,
nsIJSEventListener **aReturn);
#endif // nsIJSEventListener_h__