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

   1 //
   2 // System.ComponentModel.Design.SelectionService
   3 //
   4 // Authors:
   5 //        Ivan N. Zlatev (contact i-nZ.net)
   6 //
   7 // (C) 2006-2007 Ivan N. Zlatev
   8
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29 using System;
  30 using System.Collections;
  31 using System.ComponentModel;
  32 using System.ComponentModel.Design;
  33 using System.Windows.Forms;
  34
  35 namespace System.ComponentModel.Design
  36 {
  37
  38         internal class SelectionService : ISelectionService
  39         {
  40
  41                 private IServiceProvider _serviceProvider;
  42                 private ArrayList _selection;
  43                 private IComponent _primarySelection;
  44
  45                 public SelectionService (IServiceProvider provider)
  46                 {
  47                         _serviceProvider = provider;
  48                         _selection = new ArrayList();
  49
  50                         IComponentChangeService changeService = provider.GetService (typeof (IComponentChangeService)) as IComponentChangeService;
  51                         if (changeService != null)
  52                                 changeService.ComponentRemoving += new ComponentEventHandler (OnComponentRemoving);
  53                 }
  54
  55                 private void OnComponentRemoving (object sender, ComponentEventArgs args)
  56                 {
  57                         if (this.GetComponentSelected (args.Component))
  58 #if NET_2_0
  59                                 this.SetSelectedComponents (new IComponent[] { args.Component }, SelectionTypes.Remove);
  60 #else
  61                                 this.SetSelectedComponents (new IComponent[] { this.RootComponent }, SelectionTypes.Click);
  62 #endif
  63                 }
  64
  65                 public event EventHandler SelectionChanging;
  66                 public event EventHandler SelectionChanged;
  67
  68                 public ICollection GetSelectedComponents()
  69                 {
  70                         if (_selection != null)
  71                                 return _selection.ToArray ();
  72
  73                         return new object[0];
  74                 }
  75
  76                 protected virtual void OnSelectionChanging ()
  77                 {
  78                         if (SelectionChanging != null)
  79                                 SelectionChanging (this, EventArgs.Empty);
  80                 }
  81
  82                 protected virtual void OnSelectionChanged ()
  83                 {
  84                         if (SelectionChanged != null)
  85                                 SelectionChanged (this, EventArgs.Empty);
  86                 }
  87
  88                 public object PrimarySelection {
  89                         get { return _primarySelection; }
  90                 }
  91
  92                 public int SelectionCount {
  93                         get {
  94                                 if (_selection != null)
  95                                         return _selection.Count;
  96
  97                                 return 0;
  98                         }
  99                 }
 100
 101
 102                 private IComponent RootComponent {
 103                         get {
 104                                 if (_serviceProvider != null) {
 105                                         IDesignerHost designerHost = _serviceProvider.GetService (typeof (IDesignerHost)) as IDesignerHost;
 106                                         if (designerHost != null)
 107                                                 return designerHost.RootComponent;
 108
 109                                 }
 110                                 return null;
 111                         }
 112                 }
 113
 114                 public bool GetComponentSelected (object component)
 115                 {
 116                         if (_selection != null)
 117                                 return _selection.Contains (component);
 118
 119                         return false;
 120                 }
 121
 122                 public void SetSelectedComponents (ICollection components)
 123                 {
 124 #if NET_2_0
 125                         SetSelectedComponents (components, SelectionTypes.Auto);
 126 #else
 127                         SetSelectedComponents (components, SelectionTypes.Normal);
 128 #endif
 129                 }
 130
 131                 // If the array is a null reference or does not contain any components,
 132                 // SetSelectedComponents selects the top-level component in the designer.
 133                 //
 134                 public void SetSelectedComponents (ICollection components, SelectionTypes selectionType)
 135                 {
 136                         bool primary, add, remove, replace, toggle, auto;
 137                         primary = add = remove = replace = toggle = auto = false;
 138
 139                         OnSelectionChanging ();
 140
 141                         if (_selection == null)
 142                                 throw new InvalidOperationException("_selection == null");
 143
 144                         if (components == null || components.Count == 0) {
 145                                 components = new ArrayList ();
 146                                 ((ArrayList) components).Add (this.RootComponent);
 147                                 selectionType = SelectionTypes.Replace;
 148                         }
 149
 150                         if (!Enum.IsDefined (typeof (SelectionTypes), selectionType)) {
 151 #if NET_2_0
 152                                 selectionType = SelectionTypes.Auto;
 153 #else
 154                                 selectionType = SelectionTypes.Normal;
 155 #endif
 156                         }
 157
 158 #if NET_2_0
 159                         auto = ((selectionType & SelectionTypes.Auto) == SelectionTypes.Auto);
 160 #else
 161                         if ((selectionType & SelectionTypes.Normal) == SelectionTypes.Normal ||
 162                                 (selectionType & SelectionTypes.MouseDown) == SelectionTypes.MouseDown ||
 163                                 (selectionType & SelectionTypes.MouseUp) == SelectionTypes.MouseUp) {
 164
 165                                         auto = true;
 166                         }
 167 #endif
 168
 169
 170                         if (auto) {
 171                                 if ((((Control.ModifierKeys & Keys.Control) == Keys.Control) || ((Control.ModifierKeys & Keys.Shift) == Keys.Shift))) {
 172                                         toggle = true;
 173                                 }
 174                                 else if (components.Count == 1) {
 175                                         object component = null;
 176                                         foreach (object c in components) {
 177                                                 component = c;
 178                                                 break;
 179                                         }
 180
 181                                         if (this.GetComponentSelected (component))
 182                                                 primary = true;
 183                                         else
 184                                                 replace = true;
 185                                 }
 186                                 else {
 187                                         replace = true;
 188                                 }
 189                         }
 190                         else {
 191 #if NET_2_0
 192                                 primary = ((selectionType & SelectionTypes.Primary) == SelectionTypes.Primary);
 193                                 add = ((selectionType & SelectionTypes.Add) == SelectionTypes.Add);
 194                                 remove = ((selectionType & SelectionTypes.Remove) == SelectionTypes.Remove);
 195                                 toggle = ((selectionType & SelectionTypes.Toggle) == SelectionTypes.Toggle);
 196 #else
 197                                 primary = ((selectionType & SelectionTypes.Click) == SelectionTypes.Click);
 198 #endif
 199                                 replace = ((selectionType & SelectionTypes.Replace) == SelectionTypes.Replace);
 200
 201                         }
 202
 203
 204                         if (replace) {
 205                                 _selection.Clear ();
 206                                 add = true;
 207                         }
 208
 209                         if (add) {
 210                                 foreach (object component in components) {
 211                                         if (component is IComponent && !_selection.Contains (component)) {
 212                                                 _selection.Add (component);
 213                                                 _primarySelection = (IComponent) component;
 214                                         }
 215                                 }
 216                         }
 217
 218                         if (remove) {
 219                                 foreach (object component in components) {
 220                                         if (component is IComponent && _selection.Contains (component)) {
 221                                                 _selection.Remove (component);
 222                                         }
 223                                 }
 224                                 if (_selection.Count == 0) {
 225                                         _primarySelection = this.RootComponent;
 226                                         _selection.Add (this.RootComponent);
 227                                 }
 228                         }
 229
 230                         if (toggle) {
 231                                 foreach (object component in components) {
 232                                         if (component is IComponent) {
 233                                                 if (_selection.Contains (component)) {
 234                                                         _selection.Remove (component);
 235                                                         if (component == _primarySelection)
 236                                                                 _primarySelection = this.RootComponent;
 237                                                 }
 238                                                 else {
 239                                                         _selection.Add (component);
 240                                                         _primarySelection = (IComponent) component;
 241                                                 }
 242                                         }
 243                                 }
 244                         }
 245
 246                         if (primary) {
 247                                 object primarySelection = null;
 248
 249                                 foreach (object component in components) {
 250                                         primarySelection = component;
 251                                         break;
 252                                 }
 253
 254                                 if (!this.GetComponentSelected (primarySelection))
 255                                         _selection.Add (_primarySelection);
 256
 257                                 _primarySelection = (IComponent) primarySelection;
 258                         }
 259
 260                         OnSelectionChanged ();
 261                 }
 262         }
 263 }