source: trunk/HeuristicLab.ExtLibs/HeuristicLab.Netron/3.0.2672.12446/Netron.Diagramming.Core-3.0.2672.12446/Tools/MultiLineTool.cs

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

namespace Netron.Diagramming.Core {

  class MultiLineTool : AbstractTool, IMouseListener, IKeyboardListener {

    #region Fields
    /// <summary>
    /// the location of the mouse when the motion starts
    /// </summary>

    private bool doDraw;
    private Point[] points;
    #endregion

    #region Constructor
    /// <summary>
    /// Initializes a new instance of the <see cref="T:MultiLineTool"/> class.
    /// </summary>
    /// <param name="name">The name of the tool.</param>
    public MultiLineTool(string name)
      : base(name) {
    }
    #endregion

    #region Methods

    /// <summary>
    /// Called when the tool is activated.
    /// </summary>
    protected override void OnActivateTool() {
      Controller.View.CurrentCursor = CursorPalette.Cross;
      this.SuspendOtherTools();
      doDraw = false;
      points = new Point[1];
    }

    /// <summary>
    /// Handles the mouse down event
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    /// <returns>Returns 'true' if the event was handled, otherwise 'false'.</returns>
    public bool MouseDown(MouseEventArgs e) {
      if (e == null)
        throw new ArgumentNullException("The argument object is 'null'");
      if (e.Button == MouseButtons.Left && Enabled && !IsSuspended) {
        Point p = e.Location;
        if (Closure(p)) {
          points[points.Length - 1] = points[0];
          doDraw = false;
          DeactivateTool();
          Package();

          return true;
        }
        Array.Resize<Point>(ref points, points.Length + 1);
        points[points.Length - 2] = p;
        doDraw = true;
        return true;
      }
      return false;
    }
    private bool Closure(Point p) {
      for (int k = 0; k < points.Length - 1; k++) {
        if (new Rectangle(points[k].X - 6, points[k].Y - 6, 12, 12).Contains(p)) {
          DialogResult res = MessageBox.Show("Do you wish to close the curve?", "Closure?", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
          if (res == DialogResult.Yes)
            return true;

        }
      }
      return false;
    }
    /// <summary>
    /// Handles the mouse move event
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseMove(MouseEventArgs e) {
      if (e == null)
        throw new ArgumentNullException("The argument object is 'null'");
      Point point = e.Location;
      if (IsActive && doDraw) {
        points[points.Length - 1] = e.Location;
        Controller.View.PaintGhostLine(MultiPointType.Straight, points);
        //Controller.View.Invalidate(System.Drawing.Rectangle.Inflate(Controller.View.Ghost.Rectangle, 20, 20));
        //TODO: find a more performant way to invalidate the area
        Controller.View.Invalidate();
      }
    }
    /// <summary>
    /// 
    /// </summary>
    /// <param name="e">The <see cref="T:System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
    public void MouseUp(MouseEventArgs e) {
      if (IsActive) {

      }
    }
    private void Package() {
      if ((points == null) ||
         (points.Length < 1) ||
         (points[0] == Point.Empty)) {
        return;
      }

      MultiPointShape shape = new MultiPointShape(
          this.Controller.Model,
          points,
          MultiPointType.Straight);

      AddMultiPointShapeCommand cmd = new AddMultiPointShapeCommand(this.Controller, shape);
      this.Controller.UndoManager.AddUndoCommand(cmd);
      this.Controller.View.ResetGhost();
      cmd.Redo();
    }
    #endregion

    #region IKeyboardListener Members

    public void KeyDown(KeyEventArgs e) {
      if (e.KeyData == Keys.Escape && IsActive) {
        DeactivateTool();
        Package();
        e.Handled = true;
      }
    }

    public void KeyUp(KeyEventArgs e) {
    }

    public void KeyPress(KeyPressEventArgs e) {
    }

    #endregion
  }

}