Button.cpp

/*
 * Button.cpp
 *
 * Created: 4/30/2014 9:11:02 AM
 *  Author: Ketil Wright
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "Button.h"
#include "MessagePump.h"
#include "MessageHandler.h"
#include "ReadButtonState.h"
extern MessagePump g_pump;

Button::Button(ReadButtonState *buttonStateReader, int pin, MsgCode code, bool activeState)
    :
		m_buttonStateReader(buttonStateReader),
        m_activeState(activeState),         // HIGH or LOW, depending on HW impl
        m_mcuPin(pin),                      // arduino pin we're attached to
        m_code(code),                       // code which gets packed into m_msg
        m_logicState(!activeState),         // assume the button is unpressed.
        m_msg(eButtonActionNone, code)      // dispatched to the message pump
{
	m_buttonStateReader->setPinMode(m_mcuPin, INPUT);
}

// Returns true if the button is pressed.
bool Button::isPressed() const
{
    return m_logicState == m_activeState;
}


// Returns information about the current
// state of the button.
Msg& Button::getMsg()
{
	m_msg.m_type = eButtonActionNone;
    unsigned long curState = m_buttonStateReader->isPressed(m_mcuPin);
    if(curState != m_logicState)
    {
        if(curState == m_activeState)
        {
            m_msg.m_type = eButtonActionPress;
        }
        else
        {
            m_msg.m_type = eButtonActionRelease;
        }
    }
    m_logicState = curState;
    return m_msg;
}