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

using System.Windows.Forms;

namespace Netron.Diagramming.Core {
  // ----------------------------------------------------------------------
  /// <summary>
  /// Tool to align shapes in various ways
  /// </summary>
  // ----------------------------------------------------------------------
  public class AlignTool : AbstractTool {

    #region Fields

    // ------------------------------------------------------------------
    /// <summary>
    /// The type of alignment to apply.
    /// </summary>
    // ------------------------------------------------------------------
    private ShapeAlignment mAlignment;

    // ------------------------------------------------------------------
    /// <summary>
    /// Gets or sets the type of alignment to apply.
    /// </summary>
    // ------------------------------------------------------------------
    public ShapeAlignment Alignment {
      get { return mAlignment; }
      set { mAlignment = value; }
    }


    #endregion

    #region Constructor

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

    #region Methods

    /// <summary>
    /// Called when the tool is activated.
    /// </summary>
    protected override void OnActivateTool() {
      bool valid = true;

      #region Validation of the selection

      //make sure we have the correct stuff on the table
      if (this.Controller.Model.Selection.SelectedItems == null || this.Controller.Model.Selection.SelectedItems.Count == 0) {
        MessageBox.Show("Nothing is selected, you need to select an existing group.", "Nothing selected.", MessageBoxButtons.OK, MessageBoxIcon.Hand);
        valid = false;
      } else if (this.Controller.Model.Selection.SelectedItems.Count != 1) {
        MessageBox.Show("Multiple items are selected, select only one group.", "Multiple items", MessageBoxButtons.OK, MessageBoxIcon.Hand);
        valid = false;
      } else if (!(this.Controller.Model.Selection.SelectedItems[0] is IGroup)) {
        MessageBox.Show("The selected item is not a group.", "Not a group.", MessageBoxButtons.OK, MessageBoxIcon.Hand);
        valid = false;
      }
      #endregion

      if (valid) {
        UngroupCommand cmd = new UngroupCommand(
            this.Controller,
           this.Controller.Model.Selection.SelectedItems[0] as IGroup);

        this.Controller.UndoManager.AddUndoCommand(cmd);
        cmd.Redo();
      }
      DeactivateTool();
      return;
    }


    #endregion


  }

}