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source: trunk/sources/HeuristicLab.Core.Views/3.3/ItemCollectionView.cs @ 2903

Last change on this file since 2903 was 2892, checked in by mkommend, 14 years ago

removed accidentally commited resize events on ItemCollectionsView (ticket #85)
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
47    public ItemCollectionView(IObservableCollection<T> content)
48      : this() {
49      Content = content;
50    }
51
52    protected override void DeregisterContentEvents() {
53      Content.ItemsAdded -= new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded);
54      Content.ItemsRemoved -= new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved);
55      Content.CollectionReset -= new CollectionItemsChangedEventHandler<T>(Content_CollectionReset);
56      base.DeregisterContentEvents();
57    }
58    protected override void RegisterContentEvents() {
59      base.RegisterContentEvents();
60      Content.ItemsAdded += new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded);
61      Content.ItemsRemoved += new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved);
62      Content.CollectionReset += new CollectionItemsChangedEventHandler<T>(Content_CollectionReset);
63    }
64
65    protected override void OnContentChanged() {
66      base.OnContentChanged();
67      Caption = "Item Collection";
68      while (itemsListView.Items.Count > 0) RemoveListViewItem(itemsListView.Items[0]);
69      itemsListView.Enabled = false;
70      detailsGroupBox.Enabled = false;
71      viewHost.Content = null;
72      addButton.Enabled = false;
73      sortAscendingButton.Enabled = false;
74      sortDescendingButton.Enabled = false;
75      removeButton.Enabled = false;
76
77      if (Content != null) {
78        Caption += " (" + Content.GetType().Name + ")";
79        itemsListView.Enabled = true;
80        addButton.Enabled = !Content.IsReadOnly;
81        foreach (T item in Content)
82          AddListViewItem(CreateListViewItem(item));
83        sortAscendingButton.Enabled = itemsListView.Items.Count > 0;
84        sortDescendingButton.Enabled = itemsListView.Items.Count > 0;
85        SortItemsListView(SortOrder.Ascending);
86      }
87    }
88
89    protected virtual T CreateItem() {
90      try {
91        return (T)Activator.CreateInstance(typeof(T));
92      } catch(Exception ex) {
93        Auxiliary.ShowErrorMessageBox(ex);
94        return null;
95      }
96    }
97    protected virtual ListViewItem CreateListViewItem(T item) {
98      if (!itemsListView.SmallImageList.Images.ContainsKey(item.GetType().FullName))
99        itemsListView.SmallImageList.Images.Add(item.GetType().FullName, item.ItemImage);
100
101      ListViewItem listViewItem = new ListViewItem();
102      listViewItem.Text = item.ToString();
103      listViewItem.ToolTipText = item.ItemName + ": " + item.ItemDescription;
104      listViewItem.ImageIndex = itemsListView.SmallImageList.Images.IndexOfKey(item.GetType().FullName);
105      listViewItem.Tag = item;
106      return listViewItem;
107    }
108    protected virtual void AddListViewItem(ListViewItem listViewItem) {
109      itemsListView.Items.Add(listViewItem);
110      ((T)listViewItem.Tag).Changed += new ChangedEventHandler(Item_Changed);
111      sortAscendingButton.Enabled = itemsListView.Items.Count > 0;
112      sortDescendingButton.Enabled = itemsListView.Items.Count > 0;
113    }
114    protected virtual void RemoveListViewItem(ListViewItem listViewItem) {
115      ((T)listViewItem.Tag).Changed -= new ChangedEventHandler(Item_Changed);
116      listViewItem.Remove();
117      sortAscendingButton.Enabled = itemsListView.Items.Count > 0;
118      sortDescendingButton.Enabled = itemsListView.Items.Count > 0;
119    }
120    protected virtual void UpdateListViewItem(ListViewItem listViewItem) {
121      if (!listViewItem.Text.Equals(listViewItem.Tag.ToString())) {
122        listViewItem.Text = listViewItem.Tag.ToString();
123        itemsListView.Sort();
124      }
125    }
126    protected virtual IEnumerable<ListViewItem> GetListViewItemsForItem(T item) {
127      foreach (ListViewItem listViewItem in itemsListView.Items) {
128        if (((T)listViewItem.Tag) == item)
129          yield return listViewItem;
130      }
131    }
132
133    #region ListView Events
134    protected virtual void itemsListView_SelectedIndexChanged(object sender, EventArgs e) {
135      removeButton.Enabled = itemsListView.SelectedItems.Count > 0 && !Content.IsReadOnly;
136      if (itemsListView.SelectedItems.Count == 1) {
137        T item = (T)itemsListView.SelectedItems[0].Tag;
138        detailsGroupBox.Enabled = true;
139        viewHost.Content = item;
140      } else {
141        viewHost.Content = null;
142        detailsGroupBox.Enabled = false;
143      }
144    }
145    protected virtual void itemsListView_SizeChanged(object sender, EventArgs e) {
146      if (itemsListView.Columns.Count > 0)
147        itemsListView.Columns[0].Width = Math.Max(0, itemsListView.Width - 25);
148    }
149    protected virtual void itemsListView_KeyDown(object sender, KeyEventArgs e) {
150      if (e.KeyCode == Keys.Delete) {
151        if ((itemsListView.SelectedItems.Count > 0) && !Content.IsReadOnly) {
152          foreach (ListViewItem item in itemsListView.SelectedItems)
153            Content.Remove((T)item.Tag);
154        }
155      }
156    }
157    protected virtual void itemsListView_DoubleClick(object sender, EventArgs e) {
158      if (itemsListView.SelectedItems.Count == 1) {
159        T item = (T)itemsListView.SelectedItems[0].Tag;
160        IView view = MainFormManager.CreateDefaultView(item);
161        if (view != null) view.Show();
162      }
163    }
164    protected virtual void itemsListView_ItemDrag(object sender, ItemDragEventArgs e) {
165      ListViewItem listViewItem = (ListViewItem)e.Item;
166      T item = (T)listViewItem.Tag;
167      DataObject data = new DataObject();
168      data.SetData("Type", item.GetType());
169      data.SetData("Value", item);
170      if (Content.IsReadOnly) {
171        DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
172      } else {
173        DragDropEffects result = DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link | DragDropEffects.Move);
174        if ((result & DragDropEffects.Move) == DragDropEffects.Move)
175          Content.Remove(item);
176      }
177    }
178    protected virtual void itemsListView_DragEnterOver(object sender, DragEventArgs e) {
179      e.Effect = DragDropEffects.None;
180      Type type = e.Data.GetData("Type") as Type;
181      if ((!Content.IsReadOnly) && (type != null) && (typeof(T).IsAssignableFrom(type))) {
182        if ((e.KeyState & 8) == 8) e.Effect = DragDropEffects.Copy;  // CTRL key
183        else if ((e.KeyState & 4) == 4) e.Effect = DragDropEffects.Move;  // SHIFT key
184        else if ((e.AllowedEffect & DragDropEffects.Link) == DragDropEffects.Link) e.Effect = DragDropEffects.Link;
185        else if ((e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy) e.Effect = DragDropEffects.Copy;
186        else if ((e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move) e.Effect = DragDropEffects.Move;
187      }
188    }
189    protected virtual void itemsListView_DragDrop(object sender, DragEventArgs e) {
190      if (e.Effect != DragDropEffects.None) {
191        T item = e.Data.GetData("Value") as T;
192        if ((e.Effect & DragDropEffects.Copy) == DragDropEffects.Copy) item = (T)item.Clone();
193        Content.Add(item);
194      }
195    }
196    #endregion
197
198    #region Button Events
199    protected virtual void addButton_Click(object sender, EventArgs e) {
200      T item = CreateItem();
201      if (item != null)
202        Content.Add(item);
203    }
204    protected virtual void sortAscendingButton_Click(object sender, EventArgs e) {
205      SortItemsListView(SortOrder.Ascending);
206    }
207    protected virtual void sortDescendingButton_Click(object sender, EventArgs e) {
208      SortItemsListView(SortOrder.Descending);
209    }
210    protected virtual void removeButton_Click(object sender, EventArgs e) {
211      if (itemsListView.SelectedItems.Count > 0) {
212        foreach (ListViewItem item in itemsListView.SelectedItems)
213          Content.Remove((T)item.Tag);
214        itemsListView.SelectedItems.Clear();
215      }
216    }
217    #endregion
218
219    #region Content Events
220    protected virtual void Content_ItemsAdded(object sender, CollectionItemsChangedEventArgs<T> e) {
221      if (InvokeRequired)
222        Invoke(new CollectionItemsChangedEventHandler<T>(Content_ItemsAdded), sender, e);
223      else
224        foreach (T item in e.Items)
225          AddListViewItem(CreateListViewItem(item));
226    }
227    protected virtual void Content_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<T> e) {
228      if (InvokeRequired)
229        Invoke(new CollectionItemsChangedEventHandler<T>(Content_ItemsRemoved), sender, e);
230      else {
231        foreach (T item in e.Items) {
232          foreach (ListViewItem listViewItem in GetListViewItemsForItem(item)) {
233            RemoveListViewItem(listViewItem);
234            break;
235          }
236        }
237      }
238    }
239    protected virtual void Content_CollectionReset(object sender, CollectionItemsChangedEventArgs<T> e) {
240      if (InvokeRequired)
241        Invoke(new CollectionItemsChangedEventHandler<T>(Content_CollectionReset), sender, e);
242      else {
243        foreach (T item in e.OldItems) {
244          foreach (ListViewItem listViewItem in GetListViewItemsForItem(item)) {
245            RemoveListViewItem(listViewItem);
246            break;
247          }
248        }
249        foreach (T item in e.Items)
250          AddListViewItem(CreateListViewItem(item));
251      }
252    }
253    #endregion
254
255    #region Item Events
256    protected virtual void Item_Changed(object sender, ChangedEventArgs e) {
257      if (InvokeRequired)
258        Invoke(new ChangedEventHandler(Item_Changed), sender, e);
259      else {
260        T item = (T)sender;
261        foreach (ListViewItem listViewItem in GetListViewItemsForItem(item))
262          UpdateListViewItem(listViewItem);
263      }
264    }
265    #endregion
266
267    #region Helpers
268    protected virtual void SortItemsListView(SortOrder sortOrder) {
269      itemsListView.Sorting = sortOrder;
270      itemsListView.Sort();
271      itemsListView.Sorting = SortOrder.None;
272    }
273    #endregion
274  }
275}
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