Fixes and enhancements from my MCPE repository. (https://github.com/mschiller890/mcpe64)

src/client/gui/screens/UsernameScreen.h

@@ -0,0 +1,37 @@
+#ifndef NET_MINECRAFT_CLIENT_GUI_SCREENS__UsernameScreen_H__
+#define NET_MINECRAFT_CLIENT_GUI_SCREENS__UsernameScreen_H__
+
+#include "../Screen.h"
+#include "../components/Button.h"
+#include <string>
+
+class UsernameScreen : public Screen
+{
+    typedef Screen super;
+public:
+    UsernameScreen();
+    virtual ~UsernameScreen();
+
+    void init();
+    virtual void setupPositions() override;
+    void render(int xm, int ym, float a);
+    void tick();
+
+    virtual bool isPauseScreen() { return false; }
+
+    virtual void keyPressed(int eventKey);
+    virtual void keyboardNewChar(char inputChar);
+    virtual bool handleBackEvent(bool isDown) { return true; } // block back/escape
+    virtual void removed();
+    virtual void mouseClicked(int x, int y, int button);
+
+protected:
+    virtual void buttonClicked(Button* button);
+
+private:
+    Button _btnDone;
+    std::string _input;
+    int _cursorBlink;
+};
+
+#endif /*NET_MINECRAFT_CLIENT_GUI_SCREENS__UsernameScreen_H__*/