source: branches/3.2/sources/HeuristicLab.PluginInfrastructure/Advanced/MultiSelectListView.cs

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace HeuristicLab.PluginInfrastructure.Advanced {
  internal partial class MultiSelectListView : ListView {
    public MultiSelectListView() {
      InitializeComponent();
    }

    private bool inhibitAutoCheck;
    protected override void OnMouseDown(MouseEventArgs e) {
      inhibitAutoCheck = true;
      base.OnMouseDown(e);
    }

    protected override void OnMouseUp(MouseEventArgs e) {
      base.OnMouseUp(e);
      inhibitAutoCheck = false;
    }

    // item check is raised for each selected item that was not directly clicked (those should be ignored)
    // and then one the item whose checkbox was clicked
    protected override void OnItemCheck(ItemCheckEventArgs ice) {
      // don't change the checked state of items that were not clicked directly
      if (inhibitAutoCheck) {
        ice.NewValue = ice.CurrentValue;
      }
      // if this item was directly clicked then check if it is selected as well
      var item = Items[ice.Index];
      if (!item.Selected) {
        // when the item was not selected previously 
        // clear any selection 
        List<ListViewItem> selectedItems = new List<ListViewItem>(SelectedItems.OfType<ListViewItem>());
        selectedItems.ForEach(x => x.Selected = false);
        // select only the clicked item
        item.Selected = true;
      }
      base.OnItemCheck(ice);
    }

    private bool suppressItemCheckedEvents;
    public bool SuppressItemCheckedEvents {
      get {
        return suppressItemCheckedEvents;
      }
      set {
        suppressItemCheckedEvents = value;
      }
    }
    protected override void OnItemChecked(ItemCheckedEventArgs e) {
      if (!suppressItemCheckedEvents)
        base.OnItemChecked(e);
    }

    public void CheckItems(IEnumerable<ListViewItem> items) {
      suppressItemCheckedEvents = true;

      foreach (var item in items)
        item.Checked = true;
      suppressItemCheckedEvents = false;
    }

    public void UncheckItems(IEnumerable<ListViewItem> items) {
      suppressItemCheckedEvents = true;

      foreach (var item in items)
        item.Checked = false;
      suppressItemCheckedEvents = false;
    }

  }
}