source: branches/PersistenceOverhaul/HeuristicLab.ExtLibs/HeuristicLab.Netron/3.0.2672.12446/Netron.Diagramming.Core-3.0.2672.12446/UndoRedo/Commands/MoveCommand.cs

using System.Drawing;
namespace Netron.Diagramming.Core {
  /// <summary>
  /// ICommand implementation of the move action
  /// </summary>
  class MoveCommand : Command {
    #region Fields
    IBundle bundle;
    IController controller;
    Point delta;
    #endregion

    #region Properties

    /// <summary>
    /// Gets the shape.
    /// </summary>
    /// <value>The shape.</value>
    public CollectionBase<IDiagramEntity> Entities {
      get { return bundle.Entities; }
    }

    #endregion

    #region Constructor
    /// <summary>
    /// Initializes a new instance of the <see cref="T:MoveCommand"/> class.
    /// </summary>
    /// <param name="controller">The controller.</param>
    /// <param name="bundle">The bundle.</param>
    /// <param name="delta">The delta.</param>
    public MoveCommand(IController controller, IBundle bundle, Point delta)
      : base(controller) {
      this.Text = "Move " + bundle.EntityName;
      this.controller = controller;
      this.delta = delta;
      this.bundle = bundle;
    }
    #endregion

    #region Methods

    /// <summary>
    /// Perform redo of this command.
    /// </summary>
    public override void Redo() {
      bundle.MoveBy(delta);
      //invalidate the space before the move
      Rectangle rec = bundle.Rectangle;
      rec.Offset(-delta.X, -delta.Y);
      rec.Inflate(20, 20);
      bundle.Invalidate(rec);//same as an invalidate on the controller level
      //invalidate the current neighborhood of the bundle
      bundle.Invalidate();

    }

    /// <summary>
    /// Perform undo of this command.
    /// </summary>
    public override void Undo() {
      bundle.MoveBy(new Point(-delta.X, -delta.Y)); //invert the vector
      //invalidate the space before the move
      Rectangle rec = bundle.Rectangle;
      rec.Offset(delta.X, delta.Y);
      rec.Inflate(20, 20);
      bundle.Invalidate(rec);//same as an invalidate on the controller level
      //invalidate the current neighborhood of the bundle
      bundle.Invalidate();
    }


    #endregion
  }

}