* UI revamp for companion radios

src/helpers/ui/MomentaryButton.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <Arduino.h>
+
+#define BUTTON_EVENT_NONE        0
+#define BUTTON_EVENT_CLICK       1
+#define BUTTON_EVENT_LONG_PRESS  2
+
+class MomentaryButton {
+  int8_t _pin;
+  int8_t prev, cancel;
+  bool _reverse;
+  int _long_millis;
+  unsigned long down_at;
+
+  bool isPressed(int level) const;
+
+public:
+  MomentaryButton(int8_t pin, int long_press_mills=0, bool reverse=false);
+  void begin(bool pulldownup=false);
+  int check(bool repeat_click=false);  // returns one of BUTTON_EVENT_*
+  void cancelClick();  // suppress next BUTTON_EVENT_CLICK (if already in DOWN state)
+  uint8_t getPin() { return _pin; }
+  bool isPressed() const;
+};