class/System.Design/System.ComponentModel.Design.Serialization/EventCodeDomSerializer.cs

   1 //
   2 // System.ComponentModel.Design.Serialization.EventCodeDomSerializer
   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.ComponentModel;
  34 using System.ComponentModel.Design;
  35
  36 using System.CodeDom;
  37
  38 namespace System.ComponentModel.Design.Serialization
  39 {
  40         internal class EventCodeDomSerializer : MemberCodeDomSerializer
  41         {
  42
  43                 private CodeThisReferenceExpression _thisReference;
  44
  45                 public EventCodeDomSerializer ()
  46                 {
  47                         // don't waste memory on something that is constant when generating the
  48                         // event codedom code - keep it as a field.
  49                         _thisReference = new CodeThisReferenceExpression ();
  50                 }
  51
  52
  53                 public override void Serialize (IDesignerSerializationManager manager, object value, MemberDescriptor descriptor,
  54                                                 CodeStatementCollection statements)
  55                 {
  56                         if (statements == null)
  57                                 throw new ArgumentNullException ("statements");
  58                         if (manager == null)
  59                                 throw new ArgumentNullException ("manager");
  60                         if (value == null)
  61                                 throw new ArgumentNullException ("value");
  62                         if (descriptor == null)
  63                                 throw new ArgumentNullException ("descriptor");
  64
  65                         IEventBindingService service = manager.GetService (typeof (IEventBindingService)) as IEventBindingService;
  66                         if (service != null) {
  67                                 EventDescriptor eventDescriptor = (EventDescriptor) descriptor;
  68                                 string methodName = (string) service.GetEventProperty (eventDescriptor).GetValue (value);
  69
  70                                 if (methodName != null) {
  71                                         CodeDelegateCreateExpression listener = new CodeDelegateCreateExpression (new CodeTypeReference (eventDescriptor.EventType),
  72                                                                                                                                                                                            _thisReference, methodName);
  73                                         CodeExpression targetObject = base.SerializeToExpression (manager, value);
  74                                         CodeEventReferenceExpression eventRef = new CodeEventReferenceExpression (targetObject, eventDescriptor.Name);
  75                                         statements.Add (new CodeAttachEventStatement (eventRef, listener));
  76                                 }
  77                         }
  78                 }
  79
  80                 public override bool ShouldSerialize (IDesignerSerializationManager manager, object value, MemberDescriptor descriptor)
  81                 {
  82                         IEventBindingService service = manager.GetService (typeof (IEventBindingService)) as IEventBindingService;
  83                         if (service != null) // serialize only if there is an event to serialize
  84                                 return service.GetEventProperty ((EventDescriptor)descriptor).GetValue (value) != null;
  85                         return false;
  86                 }
  87         }
  88 }
  89 #endif