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 using System.Threading.Tasks;
  33
  34 namespace System.Windows.Threading {
  35
  36         public sealed class DispatcherOperation {
  37                 DispatcherOperationStatus status;
  38                 DispatcherPriority priority;
  39                 Dispatcher dispatcher;
  40                 object result;
  41                 Delegate delegate_method;
  42                 object [] delegate_args;
  43
  44                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio)
  45                 {
  46                         dispatcher = dis;
  47                         priority = prio;
  48                         if (Dispatcher.HasShutdownFinished)
  49                                 status = DispatcherOperationStatus.Aborted;
  50                         else
  51                                 status = DispatcherOperationStatus.Pending;
  52                 }
  53
  54                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio, Delegate d)
  55                         : this (dis, prio)
  56                 {
  57                         delegate_method = d;
  58                 }
  59
  60                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio, Delegate d, object arg)
  61                         : this (dis, prio)
  62                 {
  63                         delegate_method = d;
  64                         delegate_args = new object [1];
  65                         delegate_args [0] = arg;
  66                 }
  67
  68                 internal DispatcherOperation (Dispatcher dis, DispatcherPriority prio, Delegate d, object arg, object [] args)
  69                         : this (dis, prio)
  70                 {
  71                         delegate_method = d;
  72                         delegate_args = new object [args.Length + 1];
  73                         delegate_args [0] = arg;
  74                         Array.Copy (args, 0, delegate_args, 1, args.Length);
  75                 }
  76
  77                 internal void Invoke ()
  78                 {
  79                         status = DispatcherOperationStatus.Executing;
  80                         result = delegate_method.DynamicInvoke (delegate_args);
  81
  82                         status = DispatcherOperationStatus.Completed;
  83
  84                         if (Completed != null)
  85                                 Completed (this, EventArgs.Empty);
  86                 }
  87
  88                 public bool Abort ()
  89                 {
  90                         status = DispatcherOperationStatus.Aborted;
  91                         throw new NotImplementedException ();
  92                 }
  93
  94                 public Task Task {
  95                         get {
  96                                 throw new NotImplementedException();
  97                         }
  98                 }
  99
 100                 public DispatcherOperationStatus Status {
 101                         get {
 102                                 return status;
 103                         }
 104
 105                         internal set {
 106                                 status = value;
 107                         }
 108                 }
 109
 110                 public Dispatcher Dispatcher {
 111                         get {
 112                                 return dispatcher;
 113                         }
 114                 }
 115
 116                 public DispatcherPriority Priority {
 117                         get {
 118                                 return priority;
 119                         }
 120
 121                         set {
 122                                 if (priority != value){
 123                                         DispatcherPriority old = priority;
 124                                         priority = value;
 125                                         dispatcher.Reprioritize (this, old);
 126                                 }
 127                         }
 128                 }
 129
 130                 public object Result {
 131                         get {
 132                                 return result;
 133                         }
 134                 }
 135
 136                 public DispatcherOperationStatus Wait ()
 137                 {
 138                         if (status == DispatcherOperationStatus.Executing)
 139                                 throw new InvalidOperationException ("Already executing");
 140
 141                         throw new NotImplementedException ();
 142                 }
 143
 144                 [SecurityCritical]
 145                 public DispatcherOperationStatus Wait (TimeSpan timeout)
 146                 {
 147                         if (status == DispatcherOperationStatus.Executing)
 148                                 throw new InvalidOperationException ("Already executing");
 149
 150                         throw new NotImplementedException ();
 151                 }
 152
 153                 public event EventHandler Aborted;
 154                 public event EventHandler Completed;
 155         }
 156 }