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source: trunk/sources/HeuristicLab.Core.Views/3.3/ItemSetView.cs @ 5815

Last change on this file since 5815 was 5744, checked in by swagner, 14 years ago

Implemented dragging of multiple items in all collection views and refactored drag & drop code (#1112)

File size: 2.8 KB
RevLine 
[2655]1#region License Information
2/* HeuristicLab
[5445]3 * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
[2655]4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
[5744]22using System.Collections;
[2655]23using System.Windows.Forms;
24using HeuristicLab.MainForm;
25
26namespace HeuristicLab.Core.Views {
[2917]27  [View("ItemSet View")]
[2727]28  [Content(typeof(ItemSet<>), true)]
[3393]29  [Content(typeof(IItemSet<>), false)]
[2655]30  public partial class ItemSetView<T> : ItemCollectionView<T> where T : class, IItem {
[5744]31    protected bool draggedItemsAlreadyContained;
32
[3393]33    public new IItemSet<T> Content {
34      get { return (IItemSet<T>)base.Content; }
[2713]35      set { base.Content = value; }
[2655]36    }
37
38    public ItemSetView() {
39      InitializeComponent();
40    }
[5380]41
[5744]42    protected override void itemsListView_DragEnter(object sender, DragEventArgs e) {
43      base.itemsListView_DragEnter(sender, e);
44      draggedItemsAlreadyContained = false;
45      if (validDragOperation) {
46        if (e.Data.GetData("HeuristicLab") is T) {
47          draggedItemsAlreadyContained = Content.Contains((T)e.Data.GetData("HeuristicLab"));
48        } else if (e.Data.GetData("HeuristicLab") is IEnumerable) {
49          IEnumerable items = (IEnumerable)e.Data.GetData("HeuristicLab");
50          foreach (object item in items)
51            draggedItemsAlreadyContained = draggedItemsAlreadyContained || Content.Contains((T)item);
52        }
[5380]53      }
54    }
[5744]55    protected override void itemsListView_DragOver(object sender, DragEventArgs e) {
56      e.Effect = DragDropEffects.None;
57      if (validDragOperation) {
58        if (((e.KeyState & 32) == 32) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Link;  // ALT key
59        else if (((e.KeyState & 4) == 4) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Move;  // SHIFT key
60        else if (e.AllowedEffect.HasFlag(DragDropEffects.Copy)) e.Effect = DragDropEffects.Copy;
61        else if (e.AllowedEffect.HasFlag(DragDropEffects.Move) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Move;
62        else if (e.AllowedEffect.HasFlag(DragDropEffects.Link) && !draggedItemsAlreadyContained) e.Effect = DragDropEffects.Link;
63      }
64    }
[2655]65  }
66}
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