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#include "MomentaryButton.h"
#define MULTI_CLICK_WINDOW_MS 280
MomentaryButton::MomentaryButton(int8_t pin, int long_press_millis, bool reverse, bool pulldownup, bool multiclick) {
_pin = pin;
_reverse = reverse;
_pull = pulldownup;
down_at = 0;
prev = _reverse ? HIGH : LOW;
cancel = 0;
_long_millis = long_press_millis;
_threshold = 0;
_click_count = 0;
_last_click_time = 0;
_multi_click_window = multiclick ? MULTI_CLICK_WINDOW_MS : 0;
_pending_click = false;
}
MomentaryButton::MomentaryButton(int8_t pin, int long_press_millis, int analog_threshold) {
_pin = pin;
_reverse = false;
_pull = false;
down_at = 0;
prev = LOW;
cancel = 0;
_long_millis = long_press_millis;
_threshold = analog_threshold;
_click_count = 0;
_last_click_time = 0;
_multi_click_window = MULTI_CLICK_WINDOW_MS;
_pending_click = false;
}
void MomentaryButton::begin() {
if (_pin >= 0 && _threshold == 0) {
pinMode(_pin, _pull ? (_reverse ? INPUT_PULLUP : INPUT_PULLDOWN) : INPUT);
}
}
bool MomentaryButton::isPressed() const {
int btn = _threshold > 0 ? (analogRead(_pin) < _threshold) : digitalRead(_pin);
return isPressed(btn);
}
void MomentaryButton::cancelClick() {
cancel = 1;
down_at = 0;
_click_count = 0;
_last_click_time = 0;
_pending_click = false;
}
bool MomentaryButton::isPressed(int level) const {
if (_threshold > 0) {
return level;
}
if (_reverse) {
return level == LOW;
} else {
return level != LOW;
}
}
int MomentaryButton::check(bool repeat_click) {
if (_pin < 0) return BUTTON_EVENT_NONE;
int event = BUTTON_EVENT_NONE;
int btn = _threshold > 0 ? (analogRead(_pin) < _threshold) : digitalRead(_pin);
if (btn != prev) {
if (isPressed(btn)) {
down_at = millis();
} else {
// button UP
if (_long_millis > 0) {
if (down_at > 0 && (unsigned long)(millis() - down_at) < _long_millis) { // only a CLICK if still within the long_press millis
_click_count++;
_last_click_time = millis();
_pending_click = true;
}
} else {
_click_count++;
_last_click_time = millis();
_pending_click = true;
}
if (event == BUTTON_EVENT_CLICK && cancel) {
event = BUTTON_EVENT_NONE;
_click_count = 0;
_last_click_time = 0;
_pending_click = false;
}
down_at = 0;
}
prev = btn;
}
if (!isPressed(btn) && cancel) { // always clear the pending 'cancel' once button is back in UP state
cancel = 0;
}
if (_long_millis > 0 && down_at > 0 && (unsigned long)(millis() - down_at) >= _long_millis) {
if (_pending_click) {
// long press during multi-click detection - cancel pending clicks
cancelClick();
} else {
event = BUTTON_EVENT_LONG_PRESS;
down_at = 0;
_click_count = 0;
_last_click_time = 0;
_pending_click = false;
}
}
if (down_at > 0 && repeat_click) {
unsigned long diff = (unsigned long)(millis() - down_at);
if (diff >= 700) {
event = BUTTON_EVENT_CLICK; // wait 700 millis before repeating the click events
}
}
if (_pending_click && (millis() - _last_click_time) >= _multi_click_window) {
if (down_at > 0) {
// still pressed - wait for button release before processing clicks
return event;
}
switch (_click_count) {
case 1:
event = BUTTON_EVENT_CLICK;
break;
case 2:
event = BUTTON_EVENT_DOUBLE_CLICK;
break;
case 3:
event = BUTTON_EVENT_TRIPLE_CLICK;
break;
default:
// For 4+ clicks, treat as triple click?
event = BUTTON_EVENT_TRIPLE_CLICK;
break;
}
_click_count = 0;
_last_click_time = 0;
_pending_click = false;
}
return event;
}
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