using System.Collections;
using System.Collections.Generic;
namespace Netron.Diagramming.Core {
  /// <summary>
  /// Group tool
  /// </summary>
  class SendToBackTool : AbstractTool {

    #region Fields

    #endregion

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

    #region Methods

    /// <summary>
    /// Called when the tool is activated.
    /// </summary>
    protected override void OnActivateTool() {
      if (this.Controller.Model.Selection.SelectedItems != null && this.Controller.Model.Selection.SelectedItems.Count > 0) {
        #region Preparation of the ordering
        //the items have to be moved in the inverse order of the Paintables
        //Usually this is a good moment to make a little drawing or example
        //to see how things function.

        SortedList<int, IDiagramEntity> list = new SortedList<int, IDiagramEntity>();
        foreach (IDiagramEntity entity in this.Controller.Model.Selection.FlattenedSelectionItems) {
          //the addition will automatically put the item in increasing order
          list.Add(this.Controller.Model.Paintables.IndexOf(entity), entity);
        }
        #endregion
        //send them backwards
        for (int k = list.Count - 1; k >= 0; k--) {
          this.Controller.Model.SendToBack(list.Values[k]);
        }
      }
      DeactivateTool();
    }

    #endregion


  }

}