mcs/class/WindowsBase/System.Windows.Threading/DispatcherOperation.cs

   1 //
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   3 // a copy of this software and associated documentation files (the
   4 // "Software"), to deal in the Software without restriction, including
   5 // without limitation the rights to use, copy, modify, merge, publish,
   6 // distribute, sublicense, and/or sell copies of the Software, and to
   7 // permit persons to whom the Software is furnished to do so, subject to
   8 // the following conditions:
   9 //
  10 // The above copyright notice and this permission notice shall be
  11 // included in all copies or substantial portions of the Software.
  12 //
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  14 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  15 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  16 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  17 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  18 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  19 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20 //
  21 // Copyright (c) 2006 Novell, Inc. (http://www.novell.com)
  22 //
  23 // Authors:
  24 //      Miguel de Icaza (miguel@novell.com)
  25 //
  26 using System;
  27 using System.Collections;
  28 using System.Collections.Generic;
  29 using System.ComponentModel;
  30 using System.Security;
  31 using System.Threading;
  32
  33 namespace System.Windows.Threading {
  34
  35         public sealed class DispatcherOperation {
  36                 DispatcherOperationStatus status;
  37                 DispatcherPriority priority;
  38                 Dispatcher dispatcher;
  39                 object result;
  40                 Delegate delegate_method;
  41                 object [] delegate_args;
  42
  43                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio)
  44                 {
  45                         dispatcher = dis;
  46                         priority = prio;
  47                         if (Dispatcher.HasShutdownFinished)
  48                                 status = DispatcherOperationStatus.Aborted;
  49                         else
  50                                 status = DispatcherOperationStatus.Pending;
  51                 }
  52
  53                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio, Delegate d)
  54                         : this (dis, prio)
  55                 {
  56                         delegate_method = d;
  57                 }
  58
  59                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio, Delegate d, object arg)
  60                         : this (dis, prio)
  61                 {
  62                         delegate_method = d;
  63                         delegate_args = new object [1];
  64                         delegate_args [0] = arg;
  65                 }
  66
  67                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio, Delegate d, object arg, object [] args)
  68                         : this (dis, prio)
  69                 {
  70                         delegate_method = d;
  71                         delegate_args = new object [args.Length + 1];
  72                         delegate_args [0] = arg;
  73                         Array.Copy (args, 1, delegate_args, 0, args.Length);
  74                 }
  75
  76                 internal void Invoke ()
  77                 {
  78                         status = DispatcherOperationStatus.Executing;
  79                         result = delegate_method.DynamicInvoke (delegate_args);
  80
  81                         status = DispatcherOperationStatus.Completed;
  82
  83                         if (Completed != null)
  84                                 Completed (this, EventArgs.Empty);
  85                 }
  86
  87                 public bool Abort ()
  88                 {
  89                         status = DispatcherOperationStatus.Aborted;
  90                         throw new NotImplementedException ();
  91                 }
  92
  93                 public DispatcherOperationStatus Status {
  94                         get {
  95                                 return status;
  96                         }
  97
  98                         internal set {
  99                                 status = value;
 100                         }
 101                 }
 102
 103                 public Dispatcher Dispatcher {
 104                         get {
 105                                 return dispatcher;
 106                         }
 107                 }
 108
 109                 public DispatcherPriority Priority {
 110                         get {
 111                                 return priority;
 112                         }
 113
 114                         set {
 115                                 if (priority != value){
 116                                         DispatcherPriority old = priority;
 117                                         priority = value;
 118                                         dispatcher.Reprioritize (this, old);
 119                                 }
 120                         }
 121                 }
 122
 123                 public object Result {
 124                         get {
 125                                 return result;
 126                         }
 127                 }
 128
 129                 public DispatcherOperationStatus Wait ()
 130                 {
 131                         if (status == DispatcherOperationStatus.Executing)
 132                                 throw new InvalidOperationException ("Already executing");
 133
 134                         throw new NotImplementedException ();
 135                 }
 136
 137                 [SecurityCritical]
 138                 public DispatcherOperationStatus Wait (TimeSpan timeout)
 139                 {
 140                         if (status == DispatcherOperationStatus.Executing)
 141                                 throw new InvalidOperationException ("Already executing");
 142
 143                         throw new NotImplementedException ();
 144                 }
 145
 146                 public event EventHandler Aborted;
 147                 public event EventHandler Completed;
 148         }
 149 }