Standalone imp (#2791)

* Moved ui elements to common folder in standalone, and add screen parameters to the api v4

* pass it as a pointer, so if standalone app supports it can change

firmware/standalone/common/ui/ui_focus.hpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ *
+ * This file is part of PortaPack.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __UI_FOCUS_H__
+#define __UI_FOCUS_H__
+
+#include "ui.hpp"
+
+namespace ui {
+
+class Widget;
+
+class FocusManager {
+   public:
+    Widget* focus_widget() const;
+    void set_focus_widget(Widget* const new_focus_widget);
+
+    void update(Widget* const top_widget, const KeyEvent event);
+    // void update(Widget* const top_widget, const TouchEvent event);
+
+   private:
+    Widget* focus_widget_{nullptr};
+};
+
+} /* namespace ui */
+
+#endif /*__UI_FOCUS_H__*/