sprite.LastDrawArea = sprite.DrawArea;

using DeltaEngine.Commands;
using DeltaEngine.Content;
using DeltaEngine.Datatypes;
using DeltaEngine.Input;
using DeltaEngine.Rendering2D;
using DeltaEngine.Rendering2D.Shapes;

namespace TestDEWS
{
    class Class1
    {
        //private Sprite m_Window;
        private FilledRect m_Window;
        private Rectangle  m_WindowRectScrSpace = Rectangle.Unused;
        private Line2D     m_WindowBorder;
        private bool       m_bDragging = false;
        
        public Class1 ()
	    {
            m_Window = new FilledRect(m_WindowRectScrSpace,Color.DarkGray);
            //m_Window = new Sprite("Verdana12Font", Rectangle.Unused); This works!
            m_Window.RenderLayer = 100;

            m_WindowBorder = new Line2D(Vector2D.Unused, Vector2D.Unused, Color.Yellow);
            m_WindowBorder.RenderLayer = 101;

            m_WindowRectScrSpace = new Rectangle(0.0f, 0.0f, 0.2f, 0.2f);
            RepositionWindow(new Vector2D(0.2f,0.2f));

            new Command(position => onMouseDown(position)).Add(new MouseButtonTrigger(MouseButton.Left, State.Pressing));
            new Command(position => onMouseUp(position)).Add(new MouseButtonTrigger(MouseButton.Left, State.Releasing));
            new Command(position => onMouseMove(position)).Add(new MousePositionTrigger(MouseButton.Left, State.Pressed));            
	    }

        public void RepositionWindow(Vector2D vPosition)
        {
            m_WindowRectScrSpace = new Rectangle(vPosition, m_WindowRectScrSpace.Size);
            m_Window.DrawArea = m_WindowRectScrSpace;
            //m_Window.LastDrawArea = m_Window.DrawArea; Does not work for filled rect
            m_WindowBorder.StartPoint = m_WindowRectScrSpace.TopLeft;
            m_WindowBorder.EndPoint = m_WindowRectScrSpace.BottomRight;
        }

        private void onMouseDown(Vector2D vPosition)
        {
            m_bDragging = true;
            RepositionWindow(vPosition);
        }

        private void onMouseUp(Vector2D vPosition)
        {
            m_bDragging = false;
        }

        private void onMouseMove(Vector2D vPosition)
        {
            if (!m_bDragging) return; // Todo: Only register event when in drag mode.
            RepositionWindow(vPosition);
        }
    }    
}