source: trunk/sources/HeuristicLab.Visualization/MouseEventListener.cs @ 1045

using System.Drawing;
using System.Windows.Forms;

namespace HeuristicLab.Visualization {
  public interface IMouseEventListener {
    void MouseMove(object sender, MouseEventArgs e);
    void MouseUp(object sender, MouseEventArgs e);

    event MouseEventHandler OnMouseMove;
    event MouseEventHandler OnMouseUp;
  }

  public delegate void SetNewClippingAreaHandler(RectangleD newClippingArea);

  public delegate void DrawRectangleHandler(Rectangle rectangle);

  public class PanListener : IMouseEventListener {
    private readonly Rectangle viewPort;
    private readonly RectangleD clippingArea;
    private readonly Point startPoint;

    public PanListener(Rectangle viewPort, RectangleD clippingArea, Point startPoint) {
      this.viewPort = viewPort;
      this.clippingArea = clippingArea;
      this.startPoint = startPoint;
    }

    #region IMouseEventListener Members

    public event SetNewClippingAreaHandler SetNewClippingArea;
    public event MouseEventHandler OnMouseMove;
    public event MouseEventHandler OnMouseUp;

    public void MouseMove(object sender, MouseEventArgs e) {
      PointD worldStartPoint = Transform.ToWorld(startPoint, viewPort, clippingArea);
      PointD worldActualPoint = Transform.ToWorld(e.Location, viewPort, clippingArea);

      double xDiff = worldActualPoint.X - worldStartPoint.X;
      double yDiff = worldActualPoint.Y - worldStartPoint.Y;

      RectangleD newClippingArea = new RectangleD();
      newClippingArea.X1 = clippingArea.X1 - xDiff;
      newClippingArea.X2 = clippingArea.X2 - xDiff;
      newClippingArea.Y1 = clippingArea.Y1 - yDiff;
      newClippingArea.Y2 = clippingArea.Y2 - yDiff;

      if (SetNewClippingArea != null) {
        SetNewClippingArea(newClippingArea);
      }

      if (OnMouseMove != null) {
        OnMouseMove(sender, e);
      }
    }

    public void MouseUp(object sender, MouseEventArgs e) {
      if (OnMouseUp != null) {
        OnMouseUp(sender, e);
      }
    }

    #endregion
  }

  public class ZoomListener : IMouseEventListener {
    private readonly Point startPoint;

    public event DrawRectangleHandler DrawRectangle;

    public ZoomListener(Point startPoint) {
      this.startPoint = startPoint;
    }

    #region IMouseEventListener Members

    public event MouseEventHandler OnMouseMove;
    public event MouseEventHandler OnMouseUp;

    public void MouseMove(object sender, MouseEventArgs e) {
      Rectangle r = new Rectangle();
      Point actualPoint = e.Location;

      if (startPoint.X < actualPoint.X) {
        r.X = startPoint.X;
        r.Width = actualPoint.X - startPoint.X;
      } else {
        r.X = actualPoint.X;
        r.Width = startPoint.X - actualPoint.X;
      }

      if (startPoint.Y < actualPoint.Y) {
        r.Y = startPoint.Y;
        r.Height = actualPoint.Y - startPoint.Y;
      } else {
        r.Y = actualPoint.Y;
        r.Height = startPoint.Y - actualPoint.Y;
      }

      if(DrawRectangle != null) {
        DrawRectangle(r);
      }

      if (OnMouseMove != null) {
        OnMouseMove(sender, e);
      }
    }

    public void MouseUp(object sender, MouseEventArgs e) {
      if (OnMouseUp != null) {
        OnMouseUp(sender, e);
      }
    }

    #endregion
  }
}