Button click, long click and double click

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Wanted to share the code that i had written to handle single click, double click and long click from ISR for any button.

Code can be found at GitHub - m-santh/Arduino-Multiclick: Arduino code for multiple click

class MultiButton {

private:
static const int DEBOUNCE_DELAY = 50; // ms
static const int DOUBLECLICK_DELAY = 250; // ms
static const int LONGCLICK_DELAY = 350; // ms

static const int STATE_IDLE = 0;
static const int STATE_SINGLE_CLICK = 1;
static const int STATE_DOUBLE_CLICK = 2;
static const int STATE_LONG_CLICK = 3;

unsigned int _lastTransition;
int _state;
bool _singleClick;
bool _longPress;
bool _doubleClick;
int _pin;

public:

/**

  • MultiButton constructor.
    */
    MultiButton(int pin) : _lastTransition(millis()), _state(LOW), _singleClick(false), _longPress(false), _doubleClick(false), _pin(pin) {
    };

/**

  • Decode hardware button state into clean clicks (single, double, long).
  • The state of isClick() etc is valid until the next call to update().
  • Periodically call update() with the current (raw, non-debounced)
  • state of a (hardware) button.
  • Suggestion is to put it in e.g. loop(), but make sure to call it at
  • least every ~20ms.
  • @param pressed {bool} Whether raw button is currently pressed
    */
    int checkPress() {
    bool previousPressed = (_state == HIGH);
    bool pressed = (PCF_01.digitalRead(_pin) == HIGH);
    int currentClick = STATE_IDLE;

unsigned int now = millis();
int diff = now - _lastTransition;

// Pressed state change
if(pressed && !previousPressed) {
_lastTransition = now;
_state = HIGH;
_singleClick = true;
currentClick = STATE_SINGLE_CLICK;

if(_doubleClick && diff <= DOUBLECLICK_DELAY) {
_longPress = false;
}
else {
_longPress = true;
_doubleClick = false;
}
}

// Release state change
if(!pressed && previousPressed) {

// Check if long press
if(_doubleClick) {
currentClick = STATE_DOUBLE_CLICK;
_doubleClick = false;
}
else if(_longPress && diff > LONGCLICK_DELAY) {
currentClick = STATE_LONG_CLICK;
_doubleClick = false;
}
else {
_doubleClick = true;
}
_state = LOW;
_singleClick = false;
_longPress = false;
}

return currentClick;
}

};