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source: trunk/sources/HeuristicLab.Core.Views/3.3/ItemCollectionView.cs @ 2818

Last change on this file since 2818 was 2818, checked in by swagner, 14 years ago

Operator architecture refactoring (#95)

  • corrected several bugs in order to get SGA working
File size: 11.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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.Generic;
24using System.Windows.Forms;
25using HeuristicLab.Collections;
26using HeuristicLab.MainForm;
27using HeuristicLab.MainForm.WindowsForms;
28
29namespace HeuristicLab.Core.Views {
30  [Content(typeof(ItemCollection<>), true)]
31  [Content(typeof(IObservableCollection<>), false)]
32  public partial class ItemCollectionView<T> : ContentView where T : class, IItem {
33    public new IObservableCollection<T> Content {
34      get { return (IObservableCollection<T>)base.Content; }
35      set { base.Content = value; }
36    }
37
38    public ListView ItemsListView {
39      get { return itemsListView; }
40    }
41
42    public ItemCollectionView() {
43      InitializeComponent();
44      Caption = "Item Collection";
45    }
46    public ItemCollectionView(IObservableCollection<T> content)
47      : this() {
48      Content = content;
49    }
50
51    protected override void DeregisterContentEvents() {
52      Content.ItemsAdded -= new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded);
53      Content.ItemsRemoved -= new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved);
54      Content.CollectionReset -= new CollectionItemsChangedEventHandler<T>(Content_CollectionReset);
55      base.DeregisterContentEvents();
56    }
57    protected override void RegisterContentEvents() {
58      base.RegisterContentEvents();
59      Content.ItemsAdded += new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded);
60      Content.ItemsRemoved += new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved);
61      Content.CollectionReset += new CollectionItemsChangedEventHandler<T>(Content_CollectionReset);
62    }
63
64    protected override void OnContentChanged() {
65      base.OnContentChanged();
66      Caption = "Item Collection";
67      while (itemsListView.Items.Count > 0) RemoveListViewItem(itemsListView.Items[0]);
68      itemsListView.Enabled = false;
69      detailsGroupBox.Enabled = false;
70      viewHost.Content = null;
71      addButton.Enabled = false;
72      sortAscendingButton.Enabled = false;
73      sortDescendingButton.Enabled = false;
74      removeButton.Enabled = false;
75
76      if (Content != null) {
77        Caption += " (" + Content.GetType().Name + ")";
78        itemsListView.Enabled = true;
79        addButton.Enabled = !Content.IsReadOnly;
80        foreach (T item in Content)
81          AddListViewItem(CreateListViewItem(item));
82        sortAscendingButton.Enabled = itemsListView.Items.Count > 0;
83        sortDescendingButton.Enabled = itemsListView.Items.Count > 0;
84        SortItemsListView(SortOrder.Ascending);
85      }
86    }
87
88    protected virtual T CreateItem() {
89      try {
90        return (T)Activator.CreateInstance(typeof(T));
91      } catch(Exception ex) {
92        Auxiliary.ShowErrorMessageBox(ex);
93        return null;
94      }
95    }
96    protected virtual ListViewItem CreateListViewItem(T item) {
97      if (!itemsListView.SmallImageList.Images.ContainsKey(item.GetType().FullName))
98        itemsListView.SmallImageList.Images.Add(item.GetType().FullName, item.ItemImage);
99
100      ListViewItem listViewItem = new ListViewItem();
101      listViewItem.Text = item.ToString();
102      listViewItem.ToolTipText = item.ItemName + ": " + item.ItemDescription;
103      listViewItem.ImageIndex = itemsListView.SmallImageList.Images.IndexOfKey(item.GetType().FullName);
104      listViewItem.Tag = item;
105      return listViewItem;
106    }
107    protected virtual void AddListViewItem(ListViewItem listViewItem) {
108      itemsListView.Items.Add(listViewItem);
109      ((T)listViewItem.Tag).Changed += new ChangedEventHandler(Item_Changed);
110      sortAscendingButton.Enabled = itemsListView.Items.Count > 0;
111      sortDescendingButton.Enabled = itemsListView.Items.Count > 0;
112    }
113    protected virtual void RemoveListViewItem(ListViewItem listViewItem) {
114      ((T)listViewItem.Tag).Changed -= new ChangedEventHandler(Item_Changed);
115      listViewItem.Remove();
116      sortAscendingButton.Enabled = itemsListView.Items.Count > 0;
117      sortDescendingButton.Enabled = itemsListView.Items.Count > 0;
118    }
119    protected virtual void UpdateListViewItem(ListViewItem listViewItem) {
120      if (!listViewItem.Text.Equals(listViewItem.Tag.ToString())) {
121        listViewItem.Text = listViewItem.Tag.ToString();
122        itemsListView.Sort();
123      }
124    }
125    protected virtual IEnumerable<ListViewItem> GetListViewItemsForItem(T item) {
126      foreach (ListViewItem listViewItem in itemsListView.Items) {
127        if (((T)listViewItem.Tag) == item)
128          yield return listViewItem;
129      }
130    }
131
132    #region ListView Events
133    protected virtual void itemsListView_SelectedIndexChanged(object sender, EventArgs e) {
134      removeButton.Enabled = itemsListView.SelectedItems.Count > 0 && !Content.IsReadOnly;
135      if (itemsListView.SelectedItems.Count == 1) {
136        T item = (T)itemsListView.SelectedItems[0].Tag;
137        viewHost.Content = item;
138        detailsGroupBox.Enabled = true;
139      } else {
140        viewHost.Content = null;
141        detailsGroupBox.Enabled = false;
142      }
143    }
144    protected virtual void itemsListView_SizeChanged(object sender, EventArgs e) {
145      if (itemsListView.Columns.Count > 0)
146        itemsListView.Columns[0].Width = Math.Max(0, itemsListView.Width - 25);
147    }
148    protected virtual void itemsListView_KeyDown(object sender, KeyEventArgs e) {
149      if (e.KeyCode == Keys.Delete) {
150        if ((itemsListView.SelectedItems.Count > 0) && !Content.IsReadOnly) {
151          foreach (ListViewItem item in itemsListView.SelectedItems)
152            Content.Remove((T)item.Tag);
153        }
154      }
155    }
156    protected virtual void itemsListView_DoubleClick(object sender, EventArgs e) {
157      if (itemsListView.SelectedItems.Count == 1) {
158        T item = (T)itemsListView.SelectedItems[0].Tag;
159        IView view = MainFormManager.CreateDefaultView(item);
160        if (view != null) view.Show();
161      }
162    }
163    protected virtual void itemsListView_ItemDrag(object sender, ItemDragEventArgs e) {
164      ListViewItem listViewItem = (ListViewItem)e.Item;
165      T item = (T)listViewItem.Tag;
166      DataObject data = new DataObject();
167      data.SetData("Type", item.GetType());
168      data.SetData("Value", item);
169      if (Content.IsReadOnly) {
170        DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
171      } else {
172        DragDropEffects result = DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link | DragDropEffects.Move);
173        if ((result & DragDropEffects.Move) == DragDropEffects.Move)
174          Content.Remove(item);
175      }
176    }
177    protected virtual void itemsListView_DragEnterOver(object sender, DragEventArgs e) {
178      e.Effect = DragDropEffects.None;
179      Type type = e.Data.GetData("Type") as Type;
180      if ((!Content.IsReadOnly) && (type != null) && (typeof(T).IsAssignableFrom(type))) {
181        if ((e.KeyState & 8) == 8) e.Effect = DragDropEffects.Copy;  // CTRL key
182        else if ((e.KeyState & 4) == 4) e.Effect = DragDropEffects.Move;  // SHIFT key
183        else if ((e.AllowedEffect & DragDropEffects.Link) == DragDropEffects.Link) e.Effect = DragDropEffects.Link;
184        else if ((e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy) e.Effect = DragDropEffects.Copy;
185        else if ((e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move) e.Effect = DragDropEffects.Move;
186      }
187    }
188    protected virtual void itemsListView_DragDrop(object sender, DragEventArgs e) {
189      if (e.Effect != DragDropEffects.None) {
190        T item = e.Data.GetData("Value") as T;
191        if ((e.Effect & DragDropEffects.Copy) == DragDropEffects.Copy) item = (T)item.Clone();
192        Content.Add(item);
193      }
194    }
195    #endregion
196
197    #region Button Events
198    protected virtual void addButton_Click(object sender, EventArgs e) {
199      T item = CreateItem();
200      if (item != null)
201        Content.Add(item);
202    }
203    protected virtual void sortAscendingButton_Click(object sender, EventArgs e) {
204      SortItemsListView(SortOrder.Ascending);
205    }
206    protected virtual void sortDescendingButton_Click(object sender, EventArgs e) {
207      SortItemsListView(SortOrder.Descending);
208    }
209    protected virtual void removeButton_Click(object sender, EventArgs e) {
210      if (itemsListView.SelectedItems.Count > 0) {
211        foreach (ListViewItem item in itemsListView.SelectedItems)
212          Content.Remove((T)item.Tag);
213        itemsListView.SelectedItems.Clear();
214      }
215    }
216    #endregion
217
218    #region Content Events
219    protected virtual void Content_ItemsAdded(object sender, CollectionItemsChangedEventArgs<T> e) {
220      if (InvokeRequired)
221        Invoke(new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded), sender, e);
222      else
223        foreach (T item in e.Items)
224          AddListViewItem(CreateListViewItem(item));
225    }
226    protected virtual void Content_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<T> e) {
227      if (InvokeRequired)
228        Invoke(new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved), sender, e);
229      else {
230        foreach (T item in e.Items) {
231          foreach (ListViewItem listViewItem in GetListViewItemsForItem(item)) {
232            RemoveListViewItem(listViewItem);
233            break;
234          }
235        }
236      }
237    }
238    protected virtual void Content_CollectionReset(object sender, CollectionItemsChangedEventArgs<T> e) {
239      if (InvokeRequired)
240        Invoke(new CollectionItemsChangedEventHandler<T>(Content_CollectionReset), sender, e);
241      else {
242        foreach (T item in e.OldItems) {
243          foreach (ListViewItem listViewItem in GetListViewItemsForItem(item)) {
244            RemoveListViewItem(listViewItem);
245            break;
246          }
247        }
248        foreach (T item in e.Items)
249          AddListViewItem(CreateListViewItem(item));
250      }
251    }
252    #endregion
253
254    #region Item Events
255    protected virtual void Item_Changed(object sender, ChangedEventArgs e) {
256      if (InvokeRequired)
257        Invoke(new ChangedEventHandler(Item_Changed), sender, e);
258      else {
259        T item = (T)sender;
260        foreach (ListViewItem listViewItem in GetListViewItemsForItem(item))
261          UpdateListViewItem(listViewItem);
262      }
263    }
264    #endregion
265
266    #region Helpers
267    protected virtual void SortItemsListView(SortOrder sortOrder) {
268      itemsListView.Sorting = sortOrder;
269      itemsListView.Sort();
270      itemsListView.Sorting = SortOrder.None;
271    }
272    #endregion
273  }
274}
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