* UI revamp for companion radios

src/helpers/ui/MomentaryButton.cpp

@@ -0,0 +1,74 @@
+#include "MomentaryButton.h"
+
+MomentaryButton::MomentaryButton(int8_t pin, int long_press_millis, bool reverse) { 
+  _pin = pin;
+  _reverse = reverse;
+  down_at = 0; 
+  prev = _reverse ? HIGH : LOW;
+  cancel = 0;
+  _long_millis = long_press_millis;
+}
+
+void MomentaryButton::begin(bool pulldownup) {
+  if (_pin >= 0) {
+    pinMode(_pin, pulldownup ? (_reverse ? INPUT_PULLUP : INPUT_PULLDOWN) : INPUT);
+  }
+}
+
+bool  MomentaryButton::isPressed() const {
+  return isPressed(digitalRead(_pin));
+}
+
+void MomentaryButton::cancelClick() {
+  cancel = 1;
+}
+
+bool MomentaryButton::isPressed(int level) const {
+  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 = 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
+          event = BUTTON_EVENT_CLICK;
+        }
+      } else {
+        event = BUTTON_EVENT_CLICK;  // any UP results in CLICK event when NOT using long_press feature
+      }
+      if (event == BUTTON_EVENT_CLICK && cancel) {
+        event = BUTTON_EVENT_NONE;
+      }
+      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) {
+    event = BUTTON_EVENT_LONG_PRESS;
+    down_at = 0;
+  }
+  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
+    }
+  }
+
+  return event;
+}