* UI revamp for companion radios

src/helpers/ui/UIScreen.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "DisplayDriver.h"
+
+#define KEY_LEFT     0xB4
+#define KEY_UP       0xB5
+#define KEY_DOWN     0xB6
+#define KEY_RIGHT    0xB7
+#define KEY_SELECT     10
+#define KEY_ENTER      13
+#define KEY_BACK       27   // Esc
+
+class UIScreen {
+protected:
+  UIScreen() { }
+public:
+  virtual int render(DisplayDriver& display) =0;   // return value is number of millis until next render
+  virtual bool handleInput(char c) { return false; }
+  virtual void poll() { }
+};
+