MomentaryButton.h

#pragma once

#if defined(ARDUINO) && ARDUINO >= 100
  #include "Arduino.h"
#else
  #include "WProgram.h"
#endif

// Any button press >= HOLD_THRESHOLD milliseconds is considered a hold,
//	not a click.
#define HOLD_THRESHOLD   2000

/**
 * Encapsulate tracking pushes on a normally-open momentary button.
 *
 * After a call to check(), the button may report that it:
 *  - wasClicked(): tapped briefly
 *  - wasHeld(): pressed for a longer period of time (and perhaps still closed)
 * The next call to check() will not report on that previous event.
 */
class MomentaryButton {
private:
	// Was this button pushed (closed) when last checked?
	boolean wasClosed;
	// Only report a hold once (even though the condition
	//	is satisfied continuously).
	boolean holdReported;
	// When was this button pushed (closed)?
	unsigned long closeTimeMillis;
	const int pin;
	boolean clicked, held; // At last check, was this button clicked (held)?
public:
	MomentaryButton(int inputPin);

	void setup();

	void check();

	boolean wasClicked();

	boolean wasHeld();
};