ATimer.h

#pragma once
/*
AWind.h - Arduino window library support for Color TFT LCD Boards
Copyright (C)2016 Andrei Degtiarev. All right reserved


You can always find the latest version of the library at
https://github.com/AndreiDegtiarev/AWind


This library is free software; you can redistribute it and/or
modify it under the terms of the CC BY-NC-SA 3.0 license.
Please see the included documents for further information.

Commercial use of this library requires you to buy a license that
will allow commercial use. This includes using the library,
modified or not, as a tool to sell products.

The license applies to all part of the library including the
examples and tools supplied with the library.
*/
#include <ITimerEventReceiver.h>

class ATimer
{
    ITimerEventReceiver *_timerEventReceiver;   
    uint32_t _msStart;                          
    uint32_t _msInterval;                       
    bool _isAutoreset;                          
    bool _isEnabled;                            
public:
    ATimer()
    {
        _isAutoreset = false;
        _isEnabled = false;
        _timerEventReceiver = NULL;
    }
    void RegisterTimerEventReceiver(ITimerEventReceiver *timerEventReceiver)
    {
        _timerEventReceiver = timerEventReceiver;
    }
    void SetAutoReset(bool isAutoreset)
    {
        _isAutoreset = isAutoreset;
    }
    void SetInterval(uint32_t milliseconds)
    {
        _msInterval = milliseconds;
    }
    bool IsEnabled()
    {
        return _isEnabled;
    }
    void Enable()
    {
        _isEnabled = true;
        _msStart = millis();
    }
    void Reset()
    {
        _isEnabled = false;
    }
    uint32_t Elapsed()
    {
        return millis() - _msStart;
    }
    //Is called by AWind framework 
    void loop()
    {
        if (_isEnabled && Elapsed() >= _msInterval && _timerEventReceiver != NULL)
        {
            _timerEventReceiver->NotifyTimer(this);
            if (_isAutoreset)
                Enable();
            else
                Reset();
        }

    }
};