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//
// nsRepeatService
//
#ifndef nsRepeatService_h__
#define nsRepeatService_h__

#include "nsCOMPtr.h"
#include "nsITimer.h"

#define INITAL_REPEAT_DELAY 250

#ifdef XP_MACOSX
#define REPEAT_DELAY        25
#else
#define REPEAT_DELAY        50
#endif

class nsITimer;

class nsRepeatService : public nsITimerCallback
{
public:

  typedef void (* Callback)(void* aData);
    
  NS_DECL_NSITIMERCALLBACK

  // Start dispatching timer events to the callback. There is no memory
  // management of aData here; it is the caller's responsibility to call
  // Stop() before aData's memory is released.
  void Start(Callback aCallback, void* aData,
             PRUint32 aInitialDelay = INITAL_REPEAT_DELAY);
  // Stop dispatching timer events to the callback. If the repeat service
  // is not currently configured with the given callback and data, this
  // is just ignored.
  void Stop(Callback aCallback, void* aData);

  static nsRepeatService* GetInstance();
  static void Shutdown();

  NS_DECL_ISUPPORTS
  virtual ~nsRepeatService();

protected:
  nsRepeatService();

private:
  Callback           mCallback;
  void*              mCallbackData;
  nsCOMPtr<nsITimer> mRepeatTimer;
  static nsRepeatService* gInstance;

}; // class nsRepeatService

#endif
