sbBaseDeviceEventTarget.h

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/* vim: set sw=2 :miv */
/*
//
// BEGIN SONGBIRD GPL
//
// This file is part of the Songbird web player.
//
// Copyright(c) 2005-2008 POTI, Inc.
// http://songbirdnest.com
//
// This file may be licensed under the terms of of the
// GNU General Public License Version 2 (the "GPL").
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// express or implied. See the GPL for the specific language
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*/
#ifndef SBBASEDEVICEEVENTTARGET_H
#define SBBASEDEVICEEVENTTARGET_H

#include "sbIDeviceEventTarget.h"

#include <nsCOMArray.h>
#include <nsDeque.h>
#include <nsWeakReference.h>
#include <prmon.h>

class sbIDeviceEventListener;

class sbBaseDeviceEventTarget : public sbIDeviceEventTarget
{
public:
  NS_DECL_SBIDEVICEEVENTTARGET;
  sbBaseDeviceEventTarget();

protected:
  virtual ~sbBaseDeviceEventTarget();

protected:
  nsresult DispatchEventInternal(nsCOMPtr<sbIDeviceEvent> aEvent);

protected:
  // the listener array should always be accessed from the main thread
  nsCOMArray<sbIDeviceEventListener> mListeners;

  struct DispatchState {
    // these are indices into mListeners
    PRInt32 index; // the currently processing listener index
    PRInt32 length;  // the number of listeners at the start of this dispatch
  };
  // our stack of states (holds *pointers* to DispatchStates)
  nsDeque mStates;
  friend class sbDeviceEventTargetRemovalHelper;

  nsCOMPtr<nsIWeakReference> mParentEventTarget;

private:
  PRMonitor* mMonitor;
};

#endif