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source: trunk/sources/HeuristicLab.Core.Views/3.3/ItemListView.cs @ 2701

Last change on this file since 2701 was 2694, checked in by swagner, 15 years ago

Operator architecture refactoring (#95)

  • finished implemented ideas which came up during yesterday's presentation of HeuristicLab.Core and related plugins
File size: 15.1 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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.ComponentModel;
25using System.Data;
26using System.Drawing;
27using System.Text;
28using System.Windows.Forms;
29using HeuristicLab.Collections;
30using HeuristicLab.Common;
31using HeuristicLab.MainForm;
32
33namespace HeuristicLab.Core.Views {
34  /// <summary>
35  /// The visual representation of all variables in a specified scope.
36  /// </summary>
37  public partial class ItemListView<T> : ObjectView where T : class, IItem {
38    /// <summary>
39    /// Gets or sets the scope whose variables to represent visually.
40    /// </summary>
41    /// <remarks>Uses property <see cref="ViewBase.Item"/> of base class <see cref="ViewBase"/>.
42    /// No won data storage present.</remarks>
43    public IObservableList<T> ItemList {
44      get { return (IObservableList<T>)Object; }
45      set { base.Object = value; }
46    }
47
48    public ListView ItemsListView {
49      get { return itemsListView; }
50    }
51
52    /// <summary>
53    /// Initializes a new instance of <see cref="VariablesScopeView"/> with caption "Variables Scope View".
54    /// </summary>
55    public ItemListView() {
56      InitializeComponent();
57      Caption = "Item List";
58    }
59
60    /// <summary>
61    /// Removes the eventhandlers from the underlying <see cref="IScope"/>.
62    /// </summary>
63    /// <remarks>Calls <see cref="ViewBase.RemoveItemEvents"/> of base class <see cref="ViewBase"/>.</remarks>
64    protected override void DeregisterObjectEvents() {
65      ItemList.ItemsAdded -= new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsAdded);
66      ItemList.ItemsRemoved -= new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsRemoved);
67      ItemList.ItemsReplaced -= new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsReplaced);
68      ItemList.ItemsMoved -= new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsMoved);
69      ItemList.CollectionReset -= new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_CollectionReset);
70      base.DeregisterObjectEvents();
71    }
72
73    /// <summary>
74    /// Adds eventhandlers to the underlying <see cref="IScope"/>.
75    /// </summary>
76    /// <remarks>Calls <see cref="ViewBase.AddItemEvents"/> of base class <see cref="ViewBase"/>.</remarks>
77    protected override void RegisterObjectEvents() {
78      base.RegisterObjectEvents();
79      ItemList.ItemsAdded += new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsAdded);
80      ItemList.ItemsRemoved += new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsRemoved);
81      ItemList.ItemsReplaced += new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsReplaced);
82      ItemList.ItemsMoved += new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsMoved);
83      ItemList.CollectionReset += new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_CollectionReset);
84    }
85
86    protected override void OnObjectChanged() {
87      base.OnObjectChanged();
88      Caption = "Item List";
89      while (itemsListView.Items.Count > 0) RemoveListViewItem(itemsListView.Items[0]);
90      itemsListView.Enabled = false;
91      detailsGroupBox.Enabled = false;
92      viewHost.Object = null;
93      addButton.Enabled = false;
94      moveUpButton.Enabled = false;
95      moveDownButton.Enabled = false;
96      removeButton.Enabled = false;
97
98      if (ItemList != null) {
99        Caption += " (" + ItemList.GetType().Name + ")";
100        itemsListView.Enabled = true;
101        addButton.Enabled = !ItemList.IsReadOnly;
102        foreach (T item in ItemList)
103          AddListViewItem(CreateListViewItem(item));
104      }
105    }
106
107    protected virtual T CreateItem() {
108      try {
109        return (T)Activator.CreateInstance(typeof(T));
110      }
111      catch (Exception ex) {
112        Auxiliary.ShowErrorMessageBox(ex);
113        return null;
114      }
115    }
116    protected virtual ListViewItem CreateListViewItem(T item) {
117      if (!itemsListView.SmallImageList.Images.ContainsKey(item.GetType().FullName))
118        itemsListView.SmallImageList.Images.Add(item.GetType().FullName, item.ItemImage);
119
120      ListViewItem listViewItem = new ListViewItem();
121      listViewItem.Text = item.ToString();
122      listViewItem.ToolTipText = item.ItemName + ": " + item.ItemDescription;
123      listViewItem.ImageIndex = itemsListView.SmallImageList.Images.IndexOfKey(item.GetType().FullName);
124      listViewItem.Tag = item;
125      return listViewItem;
126    }
127    protected virtual void AddListViewItem(ListViewItem listViewItem) {
128      itemsListView.Items.Add(listViewItem);
129      ((T)listViewItem.Tag).Changed += new ChangedEventHandler(Item_Changed);
130    }
131    protected virtual void InsertListViewItem(int index, ListViewItem listViewItem) {
132      itemsListView.Items.Insert(index, listViewItem);
133      ((T)listViewItem.Tag).Changed += new ChangedEventHandler(Item_Changed);
134    }
135    protected virtual void RemoveListViewItem(ListViewItem listViewItem) {
136      ((T)listViewItem.Tag).Changed -= new ChangedEventHandler(Item_Changed);
137      listViewItem.Remove();
138    }
139    protected virtual void UpdateListViewItem(ListViewItem listViewItem) {
140      T item = (T)listViewItem.Tag;
141      if (!itemsListView.SmallImageList.Images.ContainsKey(item.GetType().FullName))
142        itemsListView.SmallImageList.Images.Add(item.GetType().FullName, item.ItemImage);
143
144      listViewItem.Text = item.ToString();
145      listViewItem.ToolTipText = item.ItemName + ": " + item.ItemDescription;
146      listViewItem.ImageIndex = itemsListView.SmallImageList.Images.IndexOfKey(item.GetType().FullName);
147    }
148
149    protected virtual void itemsListView_SelectedIndexChanged(object sender, EventArgs e) {
150      moveUpButton.Enabled = itemsListView.SelectedItems.Count == 1 &&
151                             itemsListView.SelectedIndices[0] != 0 &&
152                             !ItemList.IsReadOnly;
153      moveDownButton.Enabled = itemsListView.SelectedItems.Count == 1 &&
154                               itemsListView.SelectedIndices[0] != itemsListView.Items.Count - 1 &&
155                               !ItemList.IsReadOnly;
156      removeButton.Enabled = itemsListView.SelectedItems.Count > 0 &&
157                             !ItemList.IsReadOnly;
158
159      if (itemsListView.SelectedItems.Count == 1) {
160        T item = (T)itemsListView.SelectedItems[0].Tag;
161        viewHost.Object = item;
162        detailsGroupBox.Enabled = true;
163      } else {
164        viewHost.Object = null;
165        detailsGroupBox.Enabled = false;
166      }
167    }
168
169    #region ListView Events
170    protected virtual void itemsListView_SizeChanged(object sender, EventArgs e) {
171      if (itemsListView.Columns.Count > 0)
172        itemsListView.Columns[0].Width = Math.Max(0, itemsListView.Width - 25);
173    }
174
175    protected virtual void itemsListView_KeyDown(object sender, KeyEventArgs e) {
176      if (e.KeyCode == Keys.Delete) {
177        if ((itemsListView.SelectedItems.Count > 0) && !ItemList.IsReadOnly) {
178          foreach (ListViewItem item in itemsListView.SelectedItems)
179            ItemList.RemoveAt(item.Index);
180        }
181      }
182    }
183
184    protected virtual void itemsListView_DoubleClick(object sender, EventArgs e) {
185      if (itemsListView.SelectedItems.Count == 1) {
186        T item = (T)itemsListView.SelectedItems[0].Tag;
187        IView view = MainFormManager.CreateDefaultView(item);
188        if (view != null) MainFormManager.MainForm.ShowView(view);
189      }
190    }
191
192    protected virtual void itemsListView_ItemDrag(object sender, ItemDragEventArgs e) {
193      ListViewItem listViewItem = (ListViewItem)e.Item;
194      T item = (T)listViewItem.Tag;
195      DataObject data = new DataObject();
196      data.SetData("Type", item.GetType());
197      data.SetData("Value", item);
198      if (ItemList.IsReadOnly) {
199        DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link);
200      } else {
201        DragDropEffects result = DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Link | DragDropEffects.Move);
202        if ((result & DragDropEffects.Move) == DragDropEffects.Move)
203          ItemList.RemoveAt(listViewItem.Index);
204      }
205    }
206    protected virtual void itemsListView_DragEnterOver(object sender, DragEventArgs e) {
207      e.Effect = DragDropEffects.None;
208      Type type = e.Data.GetData("Type") as Type;
209      if ((!ItemList.IsReadOnly) && (type != null) && (typeof(T).IsAssignableFrom(type))) {
210        if ((e.KeyState & 8) == 8) e.Effect = DragDropEffects.Copy;  // CTRL key
211        else if ((e.KeyState & 4) == 4) e.Effect = DragDropEffects.Move;  // SHIFT key
212        else if ((e.AllowedEffect & DragDropEffects.Link) == DragDropEffects.Link) e.Effect = DragDropEffects.Link;
213        else if ((e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy) e.Effect = DragDropEffects.Copy;
214        else if ((e.AllowedEffect & DragDropEffects.Move) == DragDropEffects.Move) e.Effect = DragDropEffects.Move;
215      }
216    }
217    protected virtual void itemsListView_DragDrop(object sender, DragEventArgs e) {
218      if (e.Effect != DragDropEffects.None) {
219        T item = e.Data.GetData("Value") as T;
220        if ((e.Effect & DragDropEffects.Copy) == DragDropEffects.Copy) item = (T)item.Clone();
221
222        Point p = itemsListView.PointToClient(new Point(e.X, e.Y));
223        ListViewItem listViewItem = itemsListView.GetItemAt(p.X, p.Y);
224        if (listViewItem != null) ItemList.Insert(listViewItem.Index, item);
225        else ItemList.Add(item);
226      }
227    }
228    #endregion
229
230    #region Button Events
231    protected virtual void addButton_Click(object sender, EventArgs e) {
232      T item = CreateItem();
233      if (item != null)
234        ItemList.Add(item);
235    }
236    protected virtual void moveUpButton_Click(object sender, EventArgs e) {
237      if (itemsListView.SelectedItems.Count == 1) {
238        int index = itemsListView.SelectedIndices[0];
239        T item = ItemList[index - 1];
240        ItemList[index - 1] = ItemList[index];
241        itemsListView.Items[index].Selected = false;
242        itemsListView.Items[index - 1].Selected = true;
243        ItemList[index] = item;
244      }
245    }
246    protected virtual void moveDownButton_Click(object sender, EventArgs e) {
247      if (itemsListView.SelectedItems.Count == 1) {
248        int index = itemsListView.SelectedIndices[0];
249        T item = ItemList[index + 1];
250        ItemList[index + 1] = ItemList[index];
251        itemsListView.Items[index].Selected = false;
252        itemsListView.Items[index + 1].Selected = true;
253        ItemList[index] = item;
254      }
255    }
256    protected virtual void removeButton_Click(object sender, EventArgs e) {
257      if (itemsListView.SelectedItems.Count > 0) {
258        foreach (ListViewItem item in itemsListView.SelectedItems)
259          ItemList.RemoveAt(item.Index);
260      }
261    }
262    #endregion
263
264    #region NamedItemCollection Events
265    protected virtual void ItemList_ItemsAdded(object sender, CollectionItemsChangedEventArgs<IndexedItem<T>> e) {
266      if (InvokeRequired)
267        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsAdded), sender, e);
268      else
269        foreach (IndexedItem<T> item in e.Items)
270          InsertListViewItem(item.Index, CreateListViewItem(item.Value));
271    }
272    protected virtual void ItemList_ItemsRemoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<T>> e) {
273      if (InvokeRequired)
274        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsRemoved), sender, e);
275      else {
276        List<ListViewItem> listViewItems = new List<ListViewItem>();
277        foreach (IndexedItem<T> item in e.Items)
278          listViewItems.Add(itemsListView.Items[item.Index]);
279        foreach (ListViewItem listViewItem in listViewItems)
280          RemoveListViewItem(listViewItem);
281      }
282    }
283    protected virtual void ItemList_ItemsReplaced(object sender, CollectionItemsChangedEventArgs<IndexedItem<T>> e) {
284      if (InvokeRequired)
285        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsReplaced), sender, e);
286      else {
287        int[] selected = new int[itemsListView.SelectedIndices.Count];
288        itemsListView.SelectedIndices.CopyTo(selected, 0);
289
290        List<ListViewItem> listViewItems = new List<ListViewItem>();
291        foreach (IndexedItem<T> item in e.OldItems)
292          listViewItems.Add(itemsListView.Items[item.Index]);
293        foreach (ListViewItem listViewItem in listViewItems)
294          RemoveListViewItem(listViewItem);
295
296        foreach (IndexedItem<T> item in e.Items)
297          InsertListViewItem(item.Index, CreateListViewItem(item.Value));
298
299        for (int i = 0; i < selected.Length; i++)
300          itemsListView.Items[selected[i]].Selected = true;
301      }
302    }
303    protected virtual void ItemList_ItemsMoved(object sender, CollectionItemsChangedEventArgs<IndexedItem<T>> e) {
304      if (InvokeRequired)
305        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_ItemsMoved), sender, e);
306      else {
307        foreach (IndexedItem<T> item in e.Items) {
308          ListViewItem listViewItem = itemsListView.Items[item.Index];
309          listViewItem.Tag = item.Value;
310          UpdateListViewItem(listViewItem);
311        }
312      }
313    }
314    protected virtual void ItemList_CollectionReset(object sender, CollectionItemsChangedEventArgs<IndexedItem<T>> e) {
315      if (InvokeRequired)
316        Invoke(new CollectionItemsChangedEventHandler<IndexedItem<T>>(ItemList_CollectionReset), sender, e);
317      else {
318        List<ListViewItem> listViewItems = new List<ListViewItem>();
319        foreach (IndexedItem<T> item in e.OldItems)
320          listViewItems.Add(itemsListView.Items[item.Index]);
321        foreach (ListViewItem listViewItem in listViewItems)
322          RemoveListViewItem(listViewItem);
323
324        foreach (IndexedItem<T> item in e.Items)
325          InsertListViewItem(item.Index, CreateListViewItem(item.Value));
326      }
327    }
328    #endregion
329
330    #region Item Events
331    protected virtual void Item_Changed(object sender, ChangedEventArgs e) {
332      if (InvokeRequired)
333        Invoke(new ChangedEventHandler(Item_Changed), sender, e);
334      else {
335        T item = (T)sender;
336        foreach (ListViewItem listViewItem in itemsListView.Items) {
337          if (((T)listViewItem.Tag) == item)
338            UpdateListViewItem(listViewItem);
339        }
340      }
341    }
342    #endregion
343  }
344}
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