1 files changed, 42 insertions, 0 deletions
diff --git a/src/displayapp/screens/Screen.h b/src/displayapp/screens/Screen.h
new file mode 100644
index 00000000..6b1d0eec
--- /dev/null
+++ b/src/displayapp/screens/Screen.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <cstdint>
+#include "../TouchEvents.h"
+
+namespace Pinetime {
+  namespace Applications {
+    class DisplayApp;
+    namespace Screens {
+      class Screen {
+        public:
+          explicit Screen(DisplayApp* app) : app{app} {}
+          virtual ~Screen() = default;
+
+          /**
+           * Most of the time, apps only react to events (touch events, for example).
+           * In this case you don't need to do anything in this method.
+           *
+           * For example, InfiniPaint does nothing in Refresh().
+           * But, if you want to update your display periodically, draw an animation...
+           * you cannot do it in a touch event handler because these handlers are not
+           * called if the user does not touch the screen.
+           *
+           * That's why Refresh() is there: update the display periodically.
+           *
+           * @return false if the app can be closed, true if it must continue to run
+           **/
+          virtual bool Refresh() = 0;
+
+          /** @return false if the button hasn't been handled by the app, true if it has been handled */
+          virtual bool OnButtonPushed() { return false; }
+
+          /** @return false if the event hasn't been handled by the app, true if it has been handled */
+          virtual bool OnTouchEvent(TouchEvents event) { return false; }
+          virtual bool OnTouchEvent(uint16_t x, uint16_t y) { return false; }
+
+        protected:
+          DisplayApp* app;
+      };
+    }
+  }
+}