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source: trunk/sources/HeuristicLab.Core.Views/3.3/ItemCollectionView.cs @ 6535

Last change on this file since 6535 was 6527, checked in by swagner, 13 years ago

Corrected cloning of multiple dropped items (#1564)
File size: 18.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2011 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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
22using System;
23using System.Collections;
24using System.Collections.Generic;
25using System.Linq;
26using System.Windows.Forms;
27using HeuristicLab.Collections;
28using HeuristicLab.Common;
29using HeuristicLab.MainForm;
30using HeuristicLab.MainForm.WindowsForms;
31using HeuristicLab.PluginInfrastructure;
32
33namespace HeuristicLab.Core.Views {
34  [View("ItemCollection View")]
35  [Content(typeof(ItemCollection<>), true)]
36  [Content(typeof(IItemCollection<>), false)]
37  public partial class ItemCollectionView<T> : ItemView where T : class, IItem {
38    protected Dictionary<T, List<ListViewItem>> itemListViewItemMapping;
39    protected TypeSelectorDialog typeSelectorDialog;
40    protected bool validDragOperation;
41
42    public new IItemCollection<T> Content {
43      get { return (IItemCollection<T>)base.Content; }
44      set { base.Content = value; }
45    }
46
47    public ListView ItemsListView {
48      get { return itemsListView; }
49    }
50
51    public ItemCollectionView() {
52      InitializeComponent();
53      itemListViewItemMapping = new Dictionary<T, List<ListViewItem>>();
54    }
55
56    protected override void Dispose(bool disposing) {
57      if (disposing) {
58        if (typeSelectorDialog != null) typeSelectorDialog.Dispose();
59        if (components != null) components.Dispose();
60      }
61      base.Dispose(disposing);
62    }
63
64    protected override void DeregisterContentEvents() {
65      Content.ItemsAdded -= new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded);
66      Content.ItemsRemoved -= new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved);
67      Content.CollectionReset -= new CollectionItemsChangedEventHandler<T>(Content_CollectionReset);
68      foreach (T item in itemListViewItemMapping.Keys) {
69        DeregisterItemEvents(item);
70      }
71      base.DeregisterContentEvents();
72    }
73    protected override void RegisterContentEvents() {
74      base.RegisterContentEvents();
75      Content.ItemsAdded += new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded);
76      Content.ItemsRemoved += new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved);
77      Content.CollectionReset += new CollectionItemsChangedEventHandler<T>(Content_CollectionReset);
78    }
79    protected virtual void DeregisterItemEvents(T item) {
80      item.ItemImageChanged -= new EventHandler(Item_ItemImageChanged);
81      item.ToStringChanged -= new EventHandler(Item_ToStringChanged);
82    }
83    protected virtual void RegisterItemEvents(T item) {
84      item.ItemImageChanged += new EventHandler(Item_ItemImageChanged);
85      item.ToStringChanged += new EventHandler(Item_ToStringChanged);
86    }
87
88    protected override void OnContentChanged() {
89      base.OnContentChanged();
90      itemsListView.Items.Clear();
91      itemListViewItemMapping.Clear();
92      RebuildImageList();
93      viewHost.Content = null;
94      if (Content != null) {
95        Caption += " (" + Content.GetType().Name + ")";
96        foreach (T item in Content)
97          AddListViewItem(CreateListViewItem(item));
98        AdjustListViewColumnSizes();
99        SortItemsListView(SortOrder.Ascending);
100      }
101    }
102
103    protected override void SetEnabledStateOfControls() {
104      base.SetEnabledStateOfControls();
105      if (Content == null) {
106        addButton.Enabled = false;
107        sortAscendingButton.Enabled = false;
108        sortDescendingButton.Enabled = false;
109        removeButton.Enabled = false;
110        itemsListView.Enabled = false;
111        detailsGroupBox.Enabled = false;
112      } else {
113        addButton.Enabled = !Content.IsReadOnly && !ReadOnly;
114        sortAscendingButton.Enabled = itemsListView.Items.Count > 1;
115        sortDescendingButton.Enabled = itemsListView.Items.Count > 1;
116        removeButton.Enabled = !Content.IsReadOnly && !ReadOnly && itemsListView.SelectedItems.Count > 0;
117        itemsListView.Enabled = true;
118        detailsGroupBox.Enabled = itemsListView.SelectedItems.Count == 1;
119      }
120    }
121
122    protected virtual T CreateItem() {
123      if (typeSelectorDialog == null) {
124        typeSelectorDialog = new TypeSelectorDialog();
125        typeSelectorDialog.Caption = "Select Item";
126        typeSelectorDialog.TypeSelector.Caption = "Available Items";
127        typeSelectorDialog.TypeSelector.Configure(typeof(T), false, true);
128      }
129
130      if (typeSelectorDialog.ShowDialog(this) == DialogResult.OK) {
131        try {
132          return (T)typeSelectorDialog.TypeSelector.CreateInstanceOfSelectedType();
133        }
134        catch (Exception ex) {
135          ErrorHandling.ShowErrorDialog(this, ex);
136        }
137      }
138      return null;
139    }
140    protected virtual ListViewItem CreateListViewItem(T item) {
141      ListViewItem listViewItem = new ListViewItem();
142      if (item == null) {
143        listViewItem.Text = "null";
144        itemsListView.SmallImageList.Images.Add(HeuristicLab.Common.Resources.VSImageLibrary.Nothing);
145        listViewItem.ImageIndex = itemsListView.SmallImageList.Images.Count - 1;
146      } else {
147        listViewItem.Text = item.ToString();
148        listViewItem.ToolTipText = item.ItemName + ": " + item.ItemDescription;
149        itemsListView.SmallImageList.Images.Add(item.ItemImage);
150        listViewItem.ImageIndex = itemsListView.SmallImageList.Images.Count - 1;
151        listViewItem.Tag = item;
152      }
153      return listViewItem;
154    }
155    protected virtual void AddListViewItem(ListViewItem listViewItem) {
156      if (listViewItem == null) throw new ArgumentNullException();
157      T item = (listViewItem.Tag as T);
158      itemsListView.Items.Add(listViewItem);
159      if (item != null) {
160        if (!itemListViewItemMapping.ContainsKey(item)) {
161          RegisterItemEvents(item);
162          itemListViewItemMapping.Add(item, new List<ListViewItem>());
163        }
164        itemListViewItemMapping[item].Add(listViewItem);
165      }
166      sortAscendingButton.Enabled = itemsListView.Items.Count > 1;
167      sortDescendingButton.Enabled = itemsListView.Items.Count > 1;
168    }
169    protected virtual void RemoveListViewItem(ListViewItem listViewItem) {
170      if (listViewItem == null) throw new ArgumentNullException();
171      T item = (listViewItem.Tag as T);
172      if (item != null) {
173        itemListViewItemMapping[item].Remove(listViewItem);
174        if (itemListViewItemMapping[item].Count == 0) {
175          itemListViewItemMapping.Remove(item);
176          DeregisterItemEvents(item);
177        }
178      }
179      listViewItem.Remove();
180      sortAscendingButton.Enabled = itemsListView.Items.Count > 1;
181      sortDescendingButton.Enabled = itemsListView.Items.Count > 1;
182    }
183    protected virtual void UpdateListViewItemImage(ListViewItem listViewItem) {
184      if (listViewItem == null) throw new ArgumentNullException();
185      T item = listViewItem.Tag as T;
186      int i = listViewItem.ImageIndex;
187      itemsListView.SmallImageList.Images[i] = item == null ? HeuristicLab.Common.Resources.VSImageLibrary.Nothing : item.ItemImage;
188      listViewItem.ImageIndex = -1;
189      listViewItem.ImageIndex = i;
190    }
191    protected virtual void UpdateListViewItemText(ListViewItem listViewItem) {
192      if (listViewItem == null) throw new ArgumentNullException();
193      T item = listViewItem.Tag as T;
194      listViewItem.Text = item == null ? "null" : item.ToString();
195      listViewItem.ToolTipText = item == null ? string.Empty : item.ItemName + ": " + item.ItemDescription;
196    }
197    protected virtual IEnumerable<ListViewItem> GetListViewItemsForItem(T item) {
198      if (item == null) {
199        List<ListViewItem> listViewItems = new List<ListViewItem>();
200        foreach (ListViewItem listViewItem in itemsListView.Items) {
201          if (listViewItem.Tag == null) listViewItems.Add(listViewItem);
202        }
203        return listViewItems;
204      } else {
205        List<ListViewItem> listViewItems = null;
206        itemListViewItemMapping.TryGetValue(item, out listViewItems);
207        return listViewItems == null ? Enumerable.Empty<ListViewItem>() : listViewItems;
208      }
209    }
210
211    #region ListView Events
212    protected virtual void itemsListView_SelectedIndexChanged(object sender, EventArgs e) {
213      removeButton.Enabled = (Content != null) && !Content.IsReadOnly && !ReadOnly && itemsListView.SelectedItems.Count > 0;
214      AdjustListViewColumnSizes();
215      if (showDetailsCheckBox.Checked) {
216        if (itemsListView.SelectedItems.Count == 1) {
217          T item = (T)itemsListView.SelectedItems[0].Tag;
218          detailsGroupBox.Enabled = true;
219          viewHost.Content = item;
220        } else {
221          viewHost.Content = null;
222          detailsGroupBox.Enabled = false;
223        }
224      }
225    }
226    protected virtual void itemsListView_KeyDown(object sender, KeyEventArgs e) {
227      if (e.KeyCode == Keys.Delete) {
228        if ((itemsListView.SelectedItems.Count > 0) && !Content.IsReadOnly && !ReadOnly) {
229          foreach (ListViewItem item in itemsListView.SelectedItems)
230            Content.Remove((T)item.Tag);
231        }
232      }
233    }
234    protected virtual void itemsListView_DoubleClick(object sender, EventArgs e) {
235      if (itemsListView.SelectedItems.Count == 1) {
236        T item = itemsListView.SelectedItems[0].Tag as T;
237        if (item != null) {
238          IContentView view = MainFormManager.MainForm.ShowContent(item);
239          if (view != null) {
240            view.ReadOnly = ReadOnly;
241            view.Locked = Locked;
242          }
243        }
244      }
245    }
246    protected virtual void itemsListView_ItemDrag(object sender, ItemDragEventArgs e) {
247      if (!Locked) {
248        List<T> items = new List<T>();
249        foreach (ListViewItem listViewItem in itemsListView.SelectedItems) {
250          T item = listViewItem.Tag as T;
251          if (item != null) items.Add(item);
252        }
253
254        if (items.Count > 0) {
255          DataObject data = new DataObject();
256          if (items.Count == 1) data.SetData(HeuristicLab.Common.Constants.DragDropDataFormat, items[0]);
257          else data.SetData(HeuristicLab.Common.Constants.DragDropDataFormat, items);
258          if (Content.IsReadOnly || ReadOnly) {
259            DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
260          } else {
261            DragDropEffects result = DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link | DragDropEffects.Move);
262            if ((result & DragDropEffects.Move) == DragDropEffects.Move) {
263              foreach (T item in items) Content.Remove(item);
264            }
265          }
266        }
267      }
268    }
269    protected virtual void itemsListView_DragEnter(object sender, DragEventArgs e) {
270      validDragOperation = false;
271      if (!Content.IsReadOnly && !ReadOnly && (e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is T)) {
272        validDragOperation = true;
273      } else if (!Content.IsReadOnly && !ReadOnly && (e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is IEnumerable)) {
274        validDragOperation = true;
275        IEnumerable items = (IEnumerable)e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat);
276        foreach (object item in items)
277          validDragOperation = validDragOperation && (item is T);
278      }
279    }
280    protected virtual void itemsListView_DragOver(object sender, DragEventArgs e) {
281      e.Effect = DragDropEffects.None;
282      if (validDragOperation) {
283        if ((e.KeyState & 32) == 32) e.Effect = DragDropEffects.Link;  // ALT key
284        else if ((e.KeyState & 4) == 4) e.Effect = DragDropEffects.Move;  // SHIFT key
285        else if (e.AllowedEffect.HasFlag(DragDropEffects.Copy)) e.Effect = DragDropEffects.Copy;
286        else if (e.AllowedEffect.HasFlag(DragDropEffects.Move)) e.Effect = DragDropEffects.Move;
287        else if (e.AllowedEffect.HasFlag(DragDropEffects.Link)) e.Effect = DragDropEffects.Link;
288      }
289    }
290    protected virtual void itemsListView_DragDrop(object sender, DragEventArgs e) {
291      if (e.Effect != DragDropEffects.None) {
292        if (e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is T) {
293          T item = (T)e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat);
294          Content.Add(e.Effect.HasFlag(DragDropEffects.Copy) ? (T)item.Clone() : item);
295        } else if (e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat) is IEnumerable) {
296          IEnumerable<T> items = ((IEnumerable)e.Data.GetData(HeuristicLab.Common.Constants.DragDropDataFormat)).Cast<T>();
297          if (e.Effect.HasFlag(DragDropEffects.Copy)) {
298            Cloner cloner = new Cloner();
299            items = items.Select(x => cloner.Clone(x));
300          }
301          foreach (T item in items)
302            Content.Add(item);
303        }
304      }
305    }
306    #endregion
307
308    #region Button Events
309    protected virtual void addButton_Click(object sender, EventArgs e) {
310      T item = CreateItem();
311      if (item != null)
312        Content.Add(item);
313    }
314    protected virtual void sortAscendingButton_Click(object sender, EventArgs e) {
315      SortItemsListView(SortOrder.Ascending);
316    }
317    protected virtual void sortDescendingButton_Click(object sender, EventArgs e) {
318      SortItemsListView(SortOrder.Descending);
319    }
320    protected virtual void removeButton_Click(object sender, EventArgs e) {
321      if (itemsListView.SelectedItems.Count > 0) {
322        foreach (ListViewItem item in itemsListView.SelectedItems)
323          Content.Remove((T)item.Tag);
324        itemsListView.SelectedItems.Clear();
325      }
326    }
327    #endregion
328
329    #region CheckBox Events
330    protected virtual void showDetailsCheckBox_CheckedChanged(object sender, EventArgs e) {
331      if (showDetailsCheckBox.Checked) {
332        splitContainer.Panel2Collapsed = false;
333        detailsGroupBox.Enabled = itemsListView.SelectedItems.Count == 1;
334        viewHost.Content = itemsListView.SelectedItems.Count == 1 ? (T)itemsListView.SelectedItems[0].Tag : null;
335      } else {
336        splitContainer.Panel2Collapsed = true;
337        viewHost.Content = null;
338      }
339    }
340    #endregion
341
342    #region Content Events
343    protected virtual void Content_ItemsAdded(object sender, CollectionItemsChangedEventArgs<T> e) {
344      if (InvokeRequired)
345        Invoke(new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded), sender, e);
346      else {
347        foreach (T item in e.Items)
348          AddListViewItem(CreateListViewItem(item));
349        AdjustListViewColumnSizes();
350      }
351
352    }
353    protected virtual void Content_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<T> e) {
354      if (InvokeRequired)
355        Invoke(new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved), sender, e);
356      else {
357        foreach (T item in e.Items) {
358          //remove only the first matching ListViewItem, because the IItem could be contained multiple times in the ItemCollection
359          ListViewItem listviewItem = GetListViewItemsForItem(item).FirstOrDefault();
360          if (listviewItem != null) RemoveListViewItem(listviewItem);
361        }
362        RebuildImageList();
363      }
364    }
365    protected virtual void Content_CollectionReset(object sender, CollectionItemsChangedEventArgs<T> e) {
366      if (InvokeRequired)
367        Invoke(new CollectionItemsChangedEventHandler<T>(Content_CollectionReset), sender, e);
368      else {
369        foreach (T item in e.OldItems) {
370          //remove only the first matching ListViewItem, because the IItem could be contained multiple times in the ItemCollection
371          ListViewItem listviewItem = GetListViewItemsForItem(item).FirstOrDefault();
372          if (listviewItem != null) RemoveListViewItem(listviewItem);
373        }
374        RebuildImageList();
375        foreach (T item in e.Items)
376          AddListViewItem(CreateListViewItem(item));
377      }
378    }
379    #endregion
380
381    #region Item Events
382    protected virtual void Item_ItemImageChanged(object sender, EventArgs e) {
383      if (InvokeRequired)
384        Invoke(new EventHandler(Item_ItemImageChanged), sender, e);
385      else {
386        T item = (T)sender;
387        foreach (ListViewItem listViewItem in GetListViewItemsForItem(item))
388          UpdateListViewItemImage(listViewItem);
389      }
390    }
391    protected virtual void Item_ToStringChanged(object sender, EventArgs e) {
392      if (InvokeRequired)
393        Invoke(new EventHandler(Item_ToStringChanged), sender, e);
394      else {
395        T item = (T)sender;
396        foreach (ListViewItem listViewItem in GetListViewItemsForItem(item))
397          UpdateListViewItemText(listViewItem);
398      }
399    }
400    #endregion
401
402    #region Helpers
403    protected virtual void SortItemsListView(SortOrder sortOrder) {
404      itemsListView.Sorting = SortOrder.None;
405      itemsListView.Sorting = sortOrder;
406      itemsListView.Sorting = SortOrder.None;
407    }
408    protected virtual void AdjustListViewColumnSizes() {
409      if (itemsListView.Items.Count > 0) {
410        for (int i = 0; i < itemsListView.Columns.Count; i++)
411          itemsListView.Columns[i].AutoResize(ColumnHeaderAutoResizeStyle.ColumnContent);
412      }
413    }
414    protected virtual void RebuildImageList() {
415      itemsListView.SmallImageList.Images.Clear();
416      foreach (ListViewItem listViewItem in itemsListView.Items) {
417        T item = listViewItem.Tag as T;
418        itemsListView.SmallImageList.Images.Add(item == null ? HeuristicLab.Common.Resources.VSImageLibrary.Nothing : item.ItemImage);
419        listViewItem.ImageIndex = itemsListView.SmallImageList.Images.Count - 1;
420      }
421    }
422    #endregion
423  }
424}
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