/elec/propeller-clock

#include <Arduino.h>

#include <button.h>

Button::Button( int pin )

	:

	_pin( pin ),

	_last_state( digitalRead( pin )? true : false ),

	_last_millis( millis() )

{

}

void Button::add_event_at( int duration, int event_id )

{

	_press_events[ duration ] = event_id;

}

int Button::update()

{

	// reset event

	_event_id = 0;

	// get time

	int millis = ::millis();

	// get state and check for change

	bool state = digitalRead( _pin )? true : false;

	if( state != _last_state )

	{

		// if the button has become unpressed

		if( !state )

		{

			// check through events to see if it had been pressed long enough

			// to trigger one

			int duration = millis - _last_millis;

			for( std::map< int, int >::iterator i = _press_events.begin();

				 i != _press_events.end(); i++ )

			{

				if( duration > i->first )

					_event_id = i->second;

				else

					break;

			}

		}

		// update last state

		_last_state = state;

		_last_millis = millis;

	}

	return _event_id;

}

int Button::get_triggered_event()

{

	return _event_id;

}