#ifndef ZOOMEDIT_GUI_RENDERAREA_H_
#define ZOOMEDIT_GUI_RENDERAREA_H_

#include <gtkmm/drawingarea.h>
#include <gtkmm/scrollbar.h>
#include <libglademm/xml.h>
#include <gtk/gtkgl.h>

namespace ZoomEdit {
namespace Gui {

class RenderArea : public Gtk::DrawingArea {
  public:
    RenderArea(BaseObjectType *cobject, const Glib::RefPtr<Gnome::Glade::Xml> &xml);
    
  private:
    static GdkGLConfig *glconfig;
    
    Gtk::HScrollbar *hScrollbar;
    Gtk::VScrollbar *vScrollbar;
    
    float xCenter, yCenter;
    
    int zoomLevel;
    float scale;
    
    void onRealize();
    bool onConfigureEvent(GdkEventConfigure *event);
    bool onExposeEvent(GdkEventExpose *event);
    bool onScrollEvent(GdkEventScroll *event);
    
    void zoom(int zoom, float x = 0.5f, float y = 0.5f);
    
    void updateViewport();
    void updateScrollbars(float x = 0.5f, float y = 0.5f);
    void updateScrolling();
    
    void drawGrid();
    
    float getViewWidth() const {
      return get_width()/scale;
    }
    
    float getViewHeight() const {
      return get_height()/scale;
    }
    
    float getImageWidth() const {return 10;}
    float getImageHeight() const {return 10;}
    
    bool gdkGLBegin() {
      GtkWidget *widget = GTK_WIDGET(gobj());
      
      return gdk_gl_drawable_gl_begin(gtk_widget_get_gl_drawable(widget), gtk_widget_get_gl_context(widget));
    }
    
    void gdkSwapBuffers() {
      gdk_gl_drawable_swap_buffers(gtk_widget_get_gl_drawable(GTK_WIDGET(gobj())));
    }
    
    void gdkGLEnd() {
      gdk_gl_drawable_gl_end(gtk_widget_get_gl_drawable(GTK_WIDGET(gobj())));
    }
};

}
}

#endif /*ZOOMEDIT_GUI_RENDERAREA_H_*/