gecko-dev/dom/base/nsIJSEventListener.h

114 строки
3.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsIJSEventListener_h__
#define nsIJSEventListener_h__
#include "nsIScriptContext.h"
#include "jsapi.h"
#include "xpcpublic.h"
#include "nsIDOMEventListener.h"
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 = nullptr;
}
JSObject* GetEventScope() const
{
return xpc_UnmarkGrayObject(mScopeObject);
}
JSObject *GetHandler() const
{
return xpc_UnmarkGrayObject(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__