mcs/class/System.Design/System.ComponentModel.Design/CollectionEditor.cs

   1 //
   2 // System.ComponentModel.Design.CollectionEditor
   3 //
   4 // Authors:
   5 //      Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 // (C) 2007 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33
  34 using System;
  35 using System.Reflection;
  36 using System.Collections;
  37 using System.ComponentModel;
  38 using System.Drawing.Design;
  39 using System.Windows.Forms;
  40 using System.Windows.Forms.Design;
  41
  42 namespace System.ComponentModel.Design
  43 {
  44         public class CollectionEditor : UITypeEditor
  45         {
  46                 protected abstract class CollectionForm : Form
  47                 {
  48                         private CollectionEditor editor;
  49                         private object editValue;
  50
  51                         public CollectionForm (CollectionEditor editor)
  52                         {
  53                                 this.editor = editor;
  54                         }
  55
  56                         protected Type CollectionItemType
  57                         {
  58                                 get { return editor.CollectionItemType; }
  59                         }
  60
  61                         protected Type CollectionType
  62                         {
  63                                 get { return editor.CollectionType; }
  64                         }
  65
  66                         protected ITypeDescriptorContext Context
  67                         {
  68                                 get { return editor.Context; }
  69                         }
  70
  71                         public object EditValue
  72                         {
  73                                 get { return editValue; }
  74                                 set
  75                                 {
  76                                         editValue = value;
  77                                         OnEditValueChanged ();
  78                                 }
  79                         }
  80
  81                         protected object[] Items
  82                         {
  83                                 get { return editor.GetItems (editValue); }
  84                                 set { editor.SetItems (editValue, value); }
  85                         }
  86
  87                         protected Type[] NewItemTypes
  88                         {
  89                                 get { return editor.NewItemTypes; }
  90                         }
  91
  92                         protected bool CanRemoveInstance (object value)
  93                         {
  94                                 return editor.CanRemoveInstance (value);
  95                         }
  96
  97                         protected virtual bool CanSelectMultipleInstances ()
  98                         {
  99                                 return editor.CanSelectMultipleInstances ();
 100                         }
 101
 102                         protected object CreateInstance (Type itemType)
 103                         {
 104                                 return editor.CreateInstance (itemType);
 105                         }
 106
 107                         protected void DestroyInstance (object instance)
 108                         {
 109                                 editor.DestroyInstance (instance);
 110                         }
 111
 112                         protected virtual void DisplayError (Exception e)
 113                         {
 114                                 MessageBox.Show (e.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Information);
 115                         }
 116
 117                         protected override object GetService (Type serviceType)
 118                         {
 119                                 return editor.GetService (serviceType);
 120                         }
 121
 122                         protected abstract void OnEditValueChanged ();
 123
 124                         protected internal virtual DialogResult ShowEditorDialog (IWindowsFormsEditorService edSvc)
 125                         {
 126                                 return edSvc.ShowDialog (this);
 127                         }
 128                 }
 129
 130                 private class ConcreteCollectionForm : CollectionForm
 131                 {
 132                         internal class ObjectContainerConverter : TypeConverter
 133                         {
 134                                 private class ObjectContainerPropertyDescriptor : TypeConverter.SimplePropertyDescriptor
 135                                 {
 136                                         private AttributeCollection attributes;
 137
 138                                         public ObjectContainerPropertyDescriptor (Type componentType, Type propertyType)
 139                                                 : base (componentType, "Value", propertyType)
 140                                         {
 141                                                 CategoryAttribute cat = new CategoryAttribute (propertyType.Name);
 142                                                 attributes = new AttributeCollection (new Attribute[] { cat });
 143                                         }
 144
 145                                         public override object GetValue (object component)
 146                                         {
 147                                                 ObjectContainer container = (ObjectContainer)component;
 148                                                 return container.Object;
 149                                         }
 150
 151                                         public override void SetValue (object component, object value)
 152                                         {
 153                                                 ObjectContainer container = (ObjectContainer)component;
 154                                                 container.Object = value;
 155                                         }
 156
 157                                         public override AttributeCollection Attributes
 158                                         {
 159                                                 get { return attributes; }
 160                                         }
 161                                 }
 162
 163                                 public override PropertyDescriptorCollection GetProperties (ITypeDescriptorContext context, object value, Attribute[] attributes)
 164                                 {
 165                                         ObjectContainer container = (ObjectContainer)value;
 166                                         ObjectContainerPropertyDescriptor desc = new ObjectContainerPropertyDescriptor (value.GetType (), container.editor.CollectionItemType);
 167                                         PropertyDescriptor[] properties = new PropertyDescriptor[] { desc };
 168                                         PropertyDescriptorCollection pc = new PropertyDescriptorCollection (properties);
 169                                         return pc;
 170                                 }
 171
 172                                 public override bool GetPropertiesSupported (ITypeDescriptorContext context)
 173                                 {
 174                                         return true;
 175                                 }
 176                         }
 177
 178                         [TypeConverter (typeof (ObjectContainerConverter))]
 179                         private class ObjectContainer
 180                         {
 181                                 internal string Name;
 182                                 internal object Object;
 183                                 internal CollectionEditor editor;
 184
 185                                 public ObjectContainer (string name, object obj, CollectionEditor editor)
 186                                 {
 187                                         this.Name = name;
 188                                         this.Object = obj;
 189                                         this.editor = editor;
 190                                 }
 191
 192                                 public override string ToString ()
 193                                 {
 194                                         return Name;
 195                                 }
 196                         }
 197
 198                         private class UpdateableListbox : ListBox
 199                         {
 200                                 public void DoRefreshItem (int index)
 201                                 {
 202                                         base.RefreshItem (index);
 203                                 }
 204                         }
 205
 206                         private CollectionEditor editor;
 207
 208                         private System.Windows.Forms.Label labelMember;
 209                         private System.Windows.Forms.Label labelProperty;
 210                         private UpdateableListbox itemsList;
 211                         private System.Windows.Forms.PropertyGrid itemDisplay;
 212                         private System.Windows.Forms.Button doClose;
 213                         private System.Windows.Forms.Button moveUp;
 214                         private System.Windows.Forms.Button moveDown;
 215                         private System.Windows.Forms.Button doAdd;
 216                         private System.Windows.Forms.Button doRemove;
 217                         private System.Windows.Forms.Button doCancel;
 218                         private System.Windows.Forms.ComboBox addType;
 219
 220                         public ConcreteCollectionForm (CollectionEditor editor)
 221                                 : base (editor)
 222                         {
 223                                 this.editor = editor;
 224
 225                                 this.labelMember = new System.Windows.Forms.Label ();
 226                                 this.labelProperty = new System.Windows.Forms.Label ();
 227                                 this.itemsList = new UpdateableListbox ();
 228                                 this.itemDisplay = new System.Windows.Forms.PropertyGrid ();
 229                                 this.doClose = new System.Windows.Forms.Button ();
 230                                 this.moveUp = new System.Windows.Forms.Button ();
 231                                 this.moveDown = new System.Windows.Forms.Button ();
 232                                 this.doAdd = new System.Windows.Forms.Button ();
 233                                 this.doRemove = new System.Windows.Forms.Button ();
 234                                 this.doCancel = new System.Windows.Forms.Button ();
 235                                 this.addType = new System.Windows.Forms.ComboBox ();
 236                                 this.SuspendLayout ();
 237                                 //
 238                                 // labelMember
 239                                 //
 240                                 this.labelMember.Location = new System.Drawing.Point (12, 9);
 241                                 this.labelMember.Size = new System.Drawing.Size (55, 13);
 242                                 this.labelMember.Text = "Members:";
 243                                 //
 244                                 // labelProperty
 245                                 //
 246                                 this.labelProperty.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left)
 247                                                         | System.Windows.Forms.AnchorStyles.Right)));
 248                                 this.labelProperty.Location = new System.Drawing.Point (172, 9);
 249                                 this.labelProperty.Size = new System.Drawing.Size (347, 13);
 250                                 this.labelProperty.Text = "Properties:";
 251                                 //
 252                                 // itemsList
 253                                 //
 254                                 this.itemsList.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
 255                                                         | System.Windows.Forms.AnchorStyles.Left)));
 256                                 this.itemsList.HorizontalScrollbar = true;
 257                                 this.itemsList.Location = new System.Drawing.Point (12, 25);
 258                                 this.itemsList.SelectionMode = System.Windows.Forms.SelectionMode.MultiExtended;
 259                                 this.itemsList.Size = new System.Drawing.Size (120, 290);
 260                                 this.itemsList.TabIndex = 0;
 261                                 this.itemsList.SelectedIndexChanged += new System.EventHandler (this.itemsList_SelectedIndexChanged);
 262                                 //
 263                                 // itemDisplay
 264                                 //
 265                                 this.itemDisplay.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
 266                                                         | System.Windows.Forms.AnchorStyles.Left)
 267                                                         | System.Windows.Forms.AnchorStyles.Right)));
 268                                 this.itemDisplay.HelpVisible = false;
 269                                 this.itemDisplay.Location = new System.Drawing.Point (175, 25);
 270                                 this.itemDisplay.Size = new System.Drawing.Size (344, 314);
 271                                 this.itemDisplay.TabIndex = 6;
 272                                 this.itemDisplay.PropertyValueChanged += new System.Windows.Forms.PropertyValueChangedEventHandler (this.itemDisplay_PropertyValueChanged);
 273                                 //
 274                                 // doClose
 275                                 //
 276                                 this.doClose.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
 277                                 this.doClose.Location = new System.Drawing.Point (341, 345);
 278                                 this.doClose.Size = new System.Drawing.Size (86, 26);
 279                                 this.doClose.TabIndex = 7;
 280                                 this.doClose.Text = "OK";
 281                                 this.doClose.Click += new System.EventHandler (this.doClose_Click);
 282                                 //
 283                                 // moveUp
 284                                 //
 285                                 this.moveUp.Location = new System.Drawing.Point (138, 25);
 286                                 this.moveUp.Size = new System.Drawing.Size (31, 28);
 287                                 this.moveUp.TabIndex = 4;
 288                                 this.moveUp.Text = "Up";
 289                                 this.moveUp.Click += new System.EventHandler (this.moveUp_Click);
 290                                 //
 291                                 // moveDown
 292                                 //
 293                                 this.moveDown.Location = new System.Drawing.Point (138, 59);
 294                                 this.moveDown.Size = new System.Drawing.Size (31, 28);
 295                                 this.moveDown.TabIndex = 5;
 296                                 this.moveDown.Text = "Dn";
 297                                 this.moveDown.Click += new System.EventHandler (this.moveDown_Click);
 298                                 //
 299                                 // doAdd
 300                                 //
 301                                 this.doAdd.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
 302                                 this.doAdd.Location = new System.Drawing.Point (12, 346);
 303                                 this.doAdd.Size = new System.Drawing.Size (59, 25);
 304                                 this.doAdd.TabIndex = 1;
 305                                 this.doAdd.Text = "Add";
 306                                 this.doAdd.Click += new System.EventHandler (this.doAdd_Click);
 307                                 //
 308                                 // doRemove
 309                                 //
 310                                 this.doRemove.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
 311                                 this.doRemove.Location = new System.Drawing.Point (77, 346);
 312                                 this.doRemove.Size = new System.Drawing.Size (55, 25);
 313                                 this.doRemove.TabIndex = 2;
 314                                 this.doRemove.Text = "Remove";
 315                                 this.doRemove.Click += new System.EventHandler (this.doRemove_Click);
 316                                 //
 317                                 // doCancel
 318                                 //
 319                                 this.doCancel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
 320                                 this.doCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
 321                                 this.doCancel.Location = new System.Drawing.Point (433, 345);
 322                                 this.doCancel.Size = new System.Drawing.Size (86, 26);
 323                                 this.doCancel.TabIndex = 8;
 324                                 this.doCancel.Text = "Cancel";
 325                                 this.doCancel.Click += new System.EventHandler (this.doCancel_Click);
 326                                 //
 327                                 // addType
 328                                 //
 329                                 this.addType.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));
 330                                 this.addType.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
 331                                 this.addType.Location = new System.Drawing.Point (12, 319);
 332                                 this.addType.Size = new System.Drawing.Size (120, 21);
 333                                 this.addType.TabIndex = 3;
 334                                 //
 335                                 // DesignerForm
 336                                 //
 337                                 this.AcceptButton = this.doClose;
 338                                 this.CancelButton = this.doCancel;
 339                                 this.ClientSize = new System.Drawing.Size (531, 381);
 340                                 this.ControlBox = false;
 341                                 this.Controls.Add (this.addType);
 342                                 this.Controls.Add (this.doCancel);
 343                                 this.Controls.Add (this.doRemove);
 344                                 this.Controls.Add (this.doAdd);
 345                                 this.Controls.Add (this.moveDown);
 346                                 this.Controls.Add (this.moveUp);
 347                                 this.Controls.Add (this.doClose);
 348                                 this.Controls.Add (this.itemDisplay);
 349                                 this.Controls.Add (this.itemsList);
 350                                 this.Controls.Add (this.labelProperty);
 351                                 this.Controls.Add (this.labelMember);
 352                                 this.HelpButton = true;
 353                                 this.MaximizeBox = false;
 354                                 this.MinimizeBox = false;
 355                                 this.MinimumSize = new System.Drawing.Size (400, 300);
 356                                 this.ShowInTaskbar = false;
 357                                 this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
 358                                 this.ResumeLayout (false);
 359
 360 #if NET_2_0
 361                                 if (editor.CollectionType.IsGenericType)
 362                                         this.Text = editor.CollectionItemType.Name + " Collection Editor";
 363                                 else
 364                                         this.Text = editor.CollectionType.Name + " Collection Editor";
 365 #else
 366                                 this.Text = editor.CollectionType.Name + " Collection Editor";
 367 #endif
 368                                 foreach (Type type in editor.NewItemTypes)
 369                                         addType.Items.Add (type.Name);
 370                                 if (addType.Items.Count > 0)
 371                                         addType.SelectedIndex = 0;
 372                         }
 373
 374                         private void AddItems ()
 375                         {
 376                                 foreach (object o in editor.GetItems (EditValue))
 377                                 {
 378                                         this.itemsList.Items.Add (new ObjectContainer (editor.GetDisplayText (o), o, editor));
 379                                 }
 380                                 if (itemsList.Items.Count > 0)
 381                                         itemsList.SelectedIndex = 0;
 382                         }
 383
 384                         private void doClose_Click (object sender, EventArgs e)
 385                         {
 386                                 object[] items = new object[itemsList.Items.Count];
 387                                 for (int i = 0; i < itemsList.Items.Count; i++)
 388                                         items[i] = ((ObjectContainer)itemsList.Items[i]).Object;
 389                                 EditValue = editor.SetItems (EditValue, items);
 390                                 this.Close ();
 391                         }
 392
 393                         private void doCancel_Click (object sender, EventArgs e)
 394                         {
 395                                 editor.CancelChanges ();
 396                                 this.Close ();
 397                         }
 398
 399                         private void itemsList_SelectedIndexChanged (object sender, EventArgs e)
 400                         {
 401                                 if (itemsList.SelectedIndex <= 0 || itemsList.SelectedItems.Count > 1)
 402                                         moveUp.Enabled = false;
 403                                 else
 404                                         moveUp.Enabled = true;
 405                                 if (itemsList.SelectedIndex > itemsList.Items.Count - 2 || itemsList.SelectedItems.Count > 1)
 406                                         moveDown.Enabled = false;
 407                                 else
 408                                         moveDown.Enabled = true;
 409
 410                                 if (itemsList.SelectedIndex == -1)
 411                                         return;
 412
 413                                 if (itemsList.SelectedItems.Count == 1)
 414                                 {
 415                                         ObjectContainer o = (ObjectContainer)itemsList.SelectedItem;
 416                                         if (Type.GetTypeCode (o.Object.GetType ()) != TypeCode.Object)
 417                                                 itemDisplay.SelectedObject = o;
 418                                         else
 419                                                 itemDisplay.SelectedObject = o.Object;
 420                                 }
 421                                 else
 422                                 {
 423                                         object[] items = new object[itemsList.SelectedItems.Count];
 424                                         for (int i = 0; i < itemsList.SelectedItems.Count; i++)
 425                                         {
 426                                                 ObjectContainer o = (ObjectContainer)itemsList.SelectedItem;
 427                                                 if (Type.GetTypeCode (o.Object.GetType ()) != TypeCode.Object)
 428                                                         items[i] = ((ObjectContainer)itemsList.SelectedItems[i]);
 429                                                 else
 430                                                         items[i] = ((ObjectContainer)itemsList.SelectedItems[i]).Object;
 431                                         }
 432                                         itemDisplay.SelectedObjects = items;
 433                                 }
 434                                 labelProperty.Text = ((ObjectContainer)itemsList.SelectedItem).Name + " properties:";
 435                         }
 436
 437                         private void itemDisplay_PropertyValueChanged (object sender, EventArgs e)
 438                         {
 439                                 int[] indices = new int[itemsList.SelectedIndices.Count];
 440                                 itemsList.SelectedIndices.CopyTo (indices, 0);
 441                                 for (int i = 0; i < indices.Length; i++)
 442                                 {
 443                                         ObjectContainer o = (ObjectContainer)itemsList.Items [indices[i]];
 444                                         o.Name = editor.GetDisplayText (o.Object);
 445                                         itemsList.DoRefreshItem (indices[i]);
 446                                 }
 447                                 for (int i = 0; i < indices.Length; i++)
 448                                         itemsList.SetSelected (indices[i], true);
 449                         }
 450
 451                         private void moveUp_Click (object sender, EventArgs e)
 452                         {
 453                                 if (itemsList.SelectedIndex <= 0)
 454                                         return;
 455
 456                                 object selected = itemsList.SelectedItem;
 457                                 int index = itemsList.SelectedIndex;
 458                                 itemsList.Items.RemoveAt (index);
 459                                 itemsList.Items.Insert (index - 1, selected);
 460                                 itemsList.SelectedIndex = index - 1;
 461                         }
 462
 463                         private void moveDown_Click (object sender, EventArgs e)
 464                         {
 465                                 if (itemsList.SelectedIndex > itemsList.Items.Count - 2)
 466                                         return;
 467
 468                                 object selected = itemsList.SelectedItem;
 469                                 int index = itemsList.SelectedIndex;
 470                                 itemsList.Items.RemoveAt (index);
 471                                 itemsList.Items.Insert (index + 1, selected);
 472                                 itemsList.SelectedIndex = index + 1;
 473                         }
 474
 475                         private void doAdd_Click (object sender, EventArgs e)
 476                         {
 477                                 object o;
 478                                 try
 479                                 {
 480                                         o = editor.CreateInstance (editor.NewItemTypes[addType.SelectedIndex]);
 481                                 }
 482                                 catch (Exception ex)
 483                                 {
 484                                         DisplayError (ex);
 485                                         return;
 486                                 }
 487                                 itemsList.Items.Add (new ObjectContainer (editor.GetDisplayText (o), o, editor));
 488                         }
 489
 490                         private void doRemove_Click (object sender, EventArgs e)
 491                         {
 492                                 if (itemsList.SelectedIndex != -1)
 493                                         itemsList.Items.RemoveAt (itemsList.SelectedIndex);
 494                         }
 495
 496                         protected override void OnEditValueChanged ()
 497                         {
 498                                 AddItems ();
 499                         }
 500                 }
 501
 502                 private Type type;
 503                 private Type collectionItemType;
 504                 private Type[] newItemTypes;
 505                 private ITypeDescriptorContext context;
 506                 private IServiceProvider provider;
 507                 private IWindowsFormsEditorService editorService;
 508
 509                 public CollectionEditor (Type type)
 510                 {
 511                         this.type = type;
 512                         this.collectionItemType = CreateCollectionItemType ();
 513                         this.newItemTypes = CreateNewItemTypes ();
 514                 }
 515
 516                 protected Type CollectionItemType
 517                 {
 518                         get { return collectionItemType; }
 519                 }
 520
 521                 protected Type CollectionType
 522                 {
 523                         get { return type; }
 524                 }
 525
 526                 protected ITypeDescriptorContext Context
 527                 {
 528                         get { return context; }
 529                 }
 530
 531                 protected virtual string HelpTopic
 532                 {
 533                         get { return "CollectionEditor"; }
 534                 }
 535
 536                 protected Type[] NewItemTypes
 537                 {
 538                         get { return newItemTypes; }
 539                 }
 540
 541                 protected virtual void CancelChanges ()
 542                 {
 543                 }
 544
 545                 protected virtual bool CanRemoveInstance (object value)
 546                 {
 547                         return true;
 548                 }
 549
 550                 protected virtual bool CanSelectMultipleInstances ()
 551                 {
 552                         return true;
 553                 }
 554
 555                 protected virtual CollectionEditor.CollectionForm CreateCollectionForm ()
 556                 {
 557                         return new ConcreteCollectionForm (this);
 558                 }
 559
 560                 protected virtual Type CreateCollectionItemType ()
 561                 {
 562                         PropertyInfo info = type.GetProperty ("Item");
 563                         return info.PropertyType;
 564                 }
 565
 566                 protected virtual object CreateInstance (Type itemType)
 567                 {
 568 #if NET_2_0
 569                         return TypeDescriptor.CreateInstance (provider, itemType, null, null);
 570 #else
 571                         return Activator.CreateInstance (itemType);
 572 #endif
 573                 }
 574
 575                 protected virtual Type[] CreateNewItemTypes ()
 576                 {
 577                         return new Type[] { collectionItemType };
 578                 }
 579
 580                 protected virtual void DestroyInstance (object instance)
 581                 {
 582                         //FIXME: I've got NO clue what this does and the documentation isn't helpfull either
 583                 }
 584
 585                 public override object EditValue (ITypeDescriptorContext context, IServiceProvider provider, object value)
 586                 {
 587                         this.context = context;
 588                         this.provider = provider;
 589
 590                         if (context != null && provider != null)
 591                         {
 592                                 editorService = (IWindowsFormsEditorService)provider.GetService (typeof (IWindowsFormsEditorService));
 593                                 if (editorService != null)
 594                                 {
 595                                         CollectionForm editorForm = CreateCollectionForm ();
 596                                         editorForm.EditValue = value;
 597
 598                                         editorForm.ShowEditorDialog (editorService);
 599
 600                                         return editorForm.EditValue;
 601                                 }
 602                         }
 603                         return base.EditValue (context, provider, value);
 604                 }
 605
 606                 protected virtual string GetDisplayText (object value)
 607                 {
 608                         if (value == null)
 609                                 return string.Empty;
 610
 611                         PropertyInfo nameProperty = value.GetType ().GetProperty ("Name");
 612                         if (nameProperty != null)
 613                         {
 614                                 string data = (nameProperty.GetValue (value, null)) as string;
 615                                 if (data != null)
 616                                         if (data.Length != 0)
 617                                                 return data;
 618                         }
 619
 620                         if (Type.GetTypeCode (value.GetType ()) == TypeCode.Object)
 621                                 return value.GetType ().Name;
 622                         else
 623                                 return value.ToString ();
 624                 }
 625
 626                 public override UITypeEditorEditStyle GetEditStyle (ITypeDescriptorContext context)
 627                 {
 628                         return UITypeEditorEditStyle.Modal;
 629                 }
 630
 631                 protected virtual object[] GetItems (object editValue)
 632                 {
 633                         if (editValue == null)
 634                                 return null;
 635                         ICollection collection = editValue as ICollection;
 636                         if (collection == null)
 637                                 return new object[0];
 638
 639                         object[] result = new object[collection.Count];
 640                         collection.CopyTo (result, 0);
 641                         return result;
 642                 }
 643
 644                 protected virtual IList GetObjectsFromInstance (object instance)
 645                 {
 646                         ArrayList list = new ArrayList ();
 647                         list.Add (instance);
 648                         return list;
 649                 }
 650
 651                 protected object GetService (Type serviceType)
 652                 {
 653                         return context.GetService (serviceType);
 654                 }
 655
 656                 protected virtual object SetItems (object editValue, object[] value)
 657                 {
 658                         IList list;
 659
 660                         if (editValue == null)
 661                                 return null;
 662
 663                         if (!(editValue is IList))
 664                                 list = new ArrayList ();
 665                         else
 666                         {
 667                                 list = editValue as IList;
 668                                 list.Clear ();
 669                         }
 670
 671                         foreach (object o in value)
 672                                 list.Add (o);
 673
 674                         return list;
 675                 }
 676
 677                 protected virtual void ShowHelp ()
 678                 {
 679                         //TODO: Fixme Add parent and URL
 680                         Help.ShowHelp (null, "", HelpTopic);
 681                 }
 682         }
 683 }