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114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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#include "jsapi.h"
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#include "xpcpublic.h"
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#include "nsIDOMEventListener.h"
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class nsIAtom;
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#define NS_IJSEVENTLISTENER_IID \
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{ 0x92f9212b, 0xa6aa, 0x4867, \
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{ 0x93, 0x8a, 0x56, 0xbe, 0x17, 0x67, 0x4f, 0xd4 } }
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// Implemented by script event listeners. Used to retrieve the
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// script object corresponding to the event target and the handler itself.
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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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//
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// Note, mTarget is a raw pointer and the owner of the nsIJSEventListener object
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// is expected to call Disconnect()!
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class nsIJSEventListener : public nsIDOMEventListener
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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, JSObject* aScopeObject,
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nsISupports *aTarget, JSObject *aHandler)
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: mContext(aContext), mScopeObject(aScopeObject), mHandler(aHandler)
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{
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nsCOMPtr<nsISupports> base = do_QueryInterface(aTarget);
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mTarget = base.get();
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}
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nsIScriptContext *GetEventContext() const
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{
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return mContext;
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}
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nsISupports *GetEventTarget() const
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{
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return mTarget;
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}
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void Disconnect()
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{
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mTarget = nsnull;
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}
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JSObject* GetEventScope() const
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{
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return xpc_UnmarkGrayObject(mScopeObject);
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}
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JSObject *GetHandler() const
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{
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return xpc_UnmarkGrayObject(mHandler);
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}
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// Set a handler for this event listener. Must not be called if
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// there is already a handler! The handler must already be bound to
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// the right target.
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virtual void SetHandler(JSObject *aHandler) = 0;
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// Among the sub-classes that inherit (directly or indirectly) from nsINode,
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// measurement of the following members may be added later if DMD finds it is
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// worthwhile:
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// - nsIJSEventListener: mEventName
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//
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virtual size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const
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{
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return 0;
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// Measurement of the following members may be added later if DMD finds it
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// is worthwhile:
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// - mContext
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// - mTarget
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//
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// The following members are not measured:
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// - mScopeObject, mHandler: because they're measured by the JS memory
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// reporters
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}
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virtual size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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protected:
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virtual ~nsIJSEventListener()
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{
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NS_ASSERTION(!mTarget, "Should have called Disconnect()!");
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}
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nsCOMPtr<nsIScriptContext> mContext;
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JSObject* mScopeObject;
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nsISupports* mTarget;
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JSObject *mHandler;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIJSEventListener, NS_IJSEVENTLISTENER_IID)
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/* factory function. aHandler must already be bound to aTarget */
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nsresult NS_NewJSEventListener(nsIScriptContext *aContext,
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JSObject* aScopeObject, nsISupports* aTarget,
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nsIAtom* aType, JSObject* aHandler,
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nsIJSEventListener **aReturn);
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#endif // nsIJSEventListener_h__
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