recursiveTimer.h

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/*******************************************************************************
** Copyright (c) 2007 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/
/*******************************************************************************
** $RCSfile: recursiveTimer.h,v $ $Revision: 1.3 $ $State: Exp $
*******************************************************************************/


#include <QTimer>
#include <QPointer>
#include <QMap>
#include <QTimerEvent>
#include <QApplication>

#include "tmqt/tmqtDefines.h"


class DT_DLL_tmqt DtRecursiveTimer : public QObject
{
   Q_OBJECT
public:
   DtRecursiveTimer(QObject *parent = 0) : QObject(parent), counter(-1)
   {
   }

   ~DtRecursiveTimer()
   {
      qDeleteAll(timers.keys());
      timers.clear();
   }

   int start(QObject *object, int duration, bool singleShot = false)
   {
      TimerInfo info;
      info.id = --counter;
      info.object = object;
      info.singleShot = singleShot;
      QTimer *timer = new QTimer(this);
      connect(timer, SIGNAL(timeout()), this, SLOT(onTimerInvoked()));
      timers[timer] = info;
      timer->start(duration);
      return info.id;
   }
   
   void stop(int id)
   {
      QMap<QTimer *, TimerInfo>::iterator iter = timers.begin();

      while(iter != timers.end())
      {
         if ((*iter).id == id)
         {
            QTimer* timer = iter.key();
            timers.erase(iter);
            delete timer;

            return;
         }

         ++iter;
      }
   }

private slots:
   void onTimerInvoked()
   {
      QTimer *timer = qobject_cast<QTimer*>(sender());
      Q_ASSERT(timers.contains(timer));
      const TimerInfo &info = timers.value(timer);
      if (info.object)
      {
         QTimerEvent *ev = new QTimerEvent(info.id);
         qApp->postEvent(info.object, ev);
         if (!info.singleShot)
         {
            return;
         }
      }
      timers.remove(timer);
      delete timer;
   }
   
private:

   struct TimerInfo
   {
      int id;
      QPointer<QObject> object;
      bool singleShot;
   };

   QMap<QTimer *, TimerInfo> timers;
   int counter;
};