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

   1 //
   2 // System.ComponentModel.Design.ReferenceService
   3 //
   4 // Authors:
   5 //  Ivan N. Zlatev (contact i-nZ.net)
   6 //
   7 // (C) 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
  30 #if NET_2_0
  31
  32 using System;
  33 using System.Collections.Generic;
  34 using System.Globalization;
  35 using System.ComponentModel;
  36
  37 namespace System.ComponentModel.Design
  38 {
  39
  40         internal class ReferenceService : IReferenceService, IDisposable
  41         {
  42
  43                 private List<IComponent> _references;
  44
  45                 internal ReferenceService (IServiceProvider provider)
  46                 {
  47                         if (provider == null)
  48                                 throw new ArgumentNullException ("provider");
  49
  50                         _references = new List<IComponent>();
  51                         IComponentChangeService serv = provider.GetService (typeof (IComponentChangeService)) as IComponentChangeService;
  52                         if (serv != null) {
  53                                 serv.ComponentAdded += OnComponentAdded;
  54                                 serv.ComponentRemoved += OnComponentRemoved;
  55                         }
  56                 }
  57
  58                 private void OnComponentAdded (object sender, ComponentEventArgs args)
  59                 {
  60                         _references.Add (args.Component);
  61                 }
  62
  63                 private void OnComponentRemoved (object sender, ComponentEventArgs args)
  64                 {
  65                         _references.Remove (args.Component);
  66                 }
  67
  68                 public IComponent GetComponent (object reference)
  69                 {
  70                         return reference as IComponent;
  71                 }
  72
  73                 public string GetName (object reference)
  74                 {
  75                         IComponent comp = reference as IComponent;
  76                         if (comp != null && comp.Site != null)
  77                                 return comp.Site.Name;
  78                         return null;
  79                 }
  80
  81                 public object GetReference (string name)
  82                 {
  83                         foreach (IComponent component in _references)
  84                                 if (component.Site != null && component.Site.Name == name)
  85                                         return component;
  86                         return null;
  87                 }
  88
  89                 public object[] GetReferences ()
  90                 {
  91                         IComponent[] references = new IComponent[_references.Count];
  92                         _references.CopyTo (references);
  93                         return references;
  94                 }
  95
  96                 public object[] GetReferences (Type baseType)
  97                 {
  98                         List<IComponent> references = new List<IComponent>();
  99
 100                         foreach (IComponent component in _references)
 101                                 if (baseType.IsAssignableFrom ((component.GetType ())))
 102                                         references.Add (component);
 103
 104                         IComponent[] refArray = new IComponent[references.Count];
 105                         references.CopyTo (refArray);
 106                         return refArray;
 107                 }
 108
 109                 public void Dispose ()
 110                 {
 111                         _references.Clear ();
 112                 }
 113         }
 114 }
 115 #endif