зеркало из https://github.com/mozilla/gecko-dev.git
125 строки
4.2 KiB
C++
125 строки
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIJSEventListener_h__
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#define nsIJSEventListener_h__
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#include "nsIScriptContext.h"
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class nsIScriptObjectOwner;
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class nsIDOMEventListener;
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class nsIAtom;
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#define NS_IJSEVENTLISTENER_IID \
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{ 0xa6cf9118, 0x15b3, 0x11d2, \
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{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
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// Implemented by script event listeners. Used to retrieve the
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// script object corresponding to the event target.
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// (Note this interface is now used to store script objects for all
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// script languages, so is no longer JS specific)
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class nsIJSEventListener : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IJSEVENTLISTENER_IID)
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nsIJSEventListener(nsIScriptContext *aContext, void *aScopeObject,
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nsISupports *aTarget)
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: mContext(aContext), mScopeObject(aScopeObject), mTarget(nsnull)
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{
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// We keep a weak-ref to the event target to prevent cycles that prevent
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// GC from cleaning up our global in all cases. However, as this is a
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// weak-ref, we must ensure it is the identity of the event target and
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// not a "tear-off" or similar that may not live as long as we expect.
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aTarget->QueryInterface(NS_GET_IID(nsISupports),
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NS_REINTERPRET_CAST(void **, &mTarget));
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if (mTarget)
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// We keep a weak-ref, so remove the reference the QI added.
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mTarget->Release();
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else {
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NS_ERROR("Failed to get identity pointer");
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}
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// To help debug such leaks, we keep a counter of the event listeners
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// currently alive. If you change |mTarget| to a strong-ref, this never
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// hits zero (running seamonkey.)
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#ifdef NS_DEBUG
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PR_AtomicIncrement(&sNumJSEventListeners);
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#endif
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}
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nsIScriptContext *GetEventContext()
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{
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return mContext;
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}
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nsISupports *GetEventTarget()
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{
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return mTarget;
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}
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void *GetEventScope()
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{
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return mScopeObject;
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}
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virtual void SetEventName(nsIAtom* aName) = 0;
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#ifdef NS_DEBUG
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static PRInt32 sNumJSEventListeners;
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#endif
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protected:
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virtual ~nsIJSEventListener()
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{
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#ifdef NS_DEBUG
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PR_AtomicDecrement(&sNumJSEventListeners);
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#endif
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}
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nsCOMPtr<nsIScriptContext> mContext;
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void *mScopeObject;
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nsISupports *mTarget; // weak ref.
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSEventListener, NS_IJSEVENTLISTENER_IID)
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/* factory function */
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nsresult NS_NewJSEventListener(nsIScriptContext *aContext,
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void *aScopeObject, nsISupports *aObject,
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nsIDOMEventListener **aReturn);
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#endif // nsIJSEventListener_h__
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