/*!
 * @file proto_singleton.h
 * @brief Definition of the GLGuiHandler singleton Class
*/

#ifndef _GLGUI_HANDLER_H
#define _GLGUI_HANDLER_H

#include "event_listener.h"
#include "glgui_widget.h"

namespace OrxGui
{
 // FORWARD DECLARATION
  class GLGuiCursor;


  //! A singleton class for the GLGui-Handler
  class GLGuiHandler : public EventListener
  {
    ObjectListDeclaration(GLGuiHandler);
  public:
    /** @returns a Pointer to the only object of this Class */
    inline static GLGuiHandler* getInstance(void) { if (!GLGuiHandler::singletonRef) GLGuiHandler::singletonRef = new GLGuiHandler();  return GLGuiHandler::singletonRef; };
    /** @brief deletes the instance if it exists */
    inline static void deleteInstance() { if (GLGuiHandler::singletonRef) delete GLGuiHandler::singletonRef; };

    void activateCursor();
    void deactivateCursor(/** ignore param */ bool deleteCursor = true);
    GLGuiCursor* cursor() const { return this->_cursor; }

    const Vector2D& cursorPositionOverFocusedWidget() const;
    const Vector2D& cursorPositionAbs() const;
    Vector2D cursorPositionRel(const GLGuiWidget* const widget) const;

    const Vector2D& resolution();

    void selectNext();
    void selectPrevious();

    void activate();
    void deactivate();

    void checkFocus();

    virtual void process(const Event &event);
    void draw();
    void tick(float dt);

  private:
    GLGuiHandler(void);
    virtual ~GLGuiHandler(void);
    static GLGuiHandler* singletonRef;


    bool                 isActive;
    GLGuiCursor*         _cursor;
    Vector2D             _resolution;

  };
}

#endif /* _GLGUI_HANDLER_H */