class/System/System.ComponentModel.Design/MenuCommand.cs

   1 //
   2 // System.ComponentModel.Design.MenuCommand.cs
   3 //
   4 // Authors:
   5 //   Alejandro Sánchez Acosta  <raciel@es.gnu.org>
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Alejandro Sánchez Acosta
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Collections;
  34 using System.Runtime.InteropServices;
  35
  36 namespace System.ComponentModel.Design
  37 {
  38         [ComVisible(true)]
  39         public class MenuCommand
  40         {
  41
  42                 private EventHandler handler;
  43                 private CommandID command;
  44                 private bool ischecked = false;
  45                 private bool enabled = true;
  46                 private bool issupported = true;
  47                 private bool visible = true;
  48 #if NET_2_0
  49                 private Hashtable properties;
  50 #endif
  51
  52                 public MenuCommand (EventHandler handler, CommandID command)
  53                 {
  54                         this.handler = handler;
  55                         this.command = command;
  56                 }
  57
  58                 public virtual bool Checked {
  59                         get {
  60                                 return ischecked;
  61                         }
  62                         set {
  63                                 if (ischecked != value) {
  64                                         ischecked = value;
  65                                         OnCommandChanged (EventArgs.Empty);
  66                                 }
  67                         }
  68                 }
  69
  70                 public virtual CommandID CommandID {
  71                         get {
  72                                 return command;
  73                         }
  74                 }
  75
  76                 public virtual bool Enabled {
  77                         get {
  78                                 return enabled;
  79                         }
  80                         set {
  81                                 if (enabled != value)
  82                                 {
  83                                         enabled = value;
  84                                         OnCommandChanged (EventArgs.Empty);
  85                                 }
  86                         }
  87                 }
  88
  89                 [MonoTODO]
  90                 public virtual int OleStatus {
  91                         get {
  92                                 // This is calcualted from the other properties, but the docs to not tell how
  93                                 // Default seems to be "3", but changes with diffentent set properties
  94                                 return 3;
  95                         }
  96                 }
  97
  98 #if NET_2_0
  99                 public virtual IDictionary Properties {
 100                         get {
 101                                 if (properties == null)
 102                                         properties = new Hashtable ();
 103                                 return properties;
 104                         }
 105                 }
 106 #endif
 107
 108                 public virtual bool Supported {
 109                         get {
 110                                 return issupported;
 111                         }
 112
 113                         set {
 114                                 issupported = value;
 115                         }
 116                 }
 117
 118                 public virtual bool Visible {
 119                         get {
 120                                 return visible;
 121                         }
 122
 123                         set {
 124                                 visible = value;
 125                         }
 126                 }
 127
 128                 public virtual void Invoke()
 129                 {
 130                         // FIXME Not sure if this invocation is what should be done here
 131                         if (handler != null)
 132                                 handler (this, EventArgs.Empty);
 133                 }
 134
 135 #if NET_2_0
 136                 public virtual void Invoke (object arg)
 137                 {
 138                         this.Invoke ();
 139                 }
 140 #endif
 141
 142                 protected virtual void OnCommandChanged (EventArgs e)
 143                 {
 144                         if (CommandChanged != null)
 145                                 CommandChanged (this, e);
 146                 }
 147
 148                 public override string ToString()
 149                 {
 150                         // MS runtime produces a NullReferenceException here if CommandID property == null
 151                         // which I guess isn't a good idea (throwing exceptions in ToStrings???) - bug in MS??
 152                         string commandpart = string.Empty;
 153                         if (command != null)
 154                                 commandpart = command.ToString ();
 155                         commandpart = string.Concat (commandpart, " : ");
 156                         if (this.Supported)
 157                                 commandpart = string.Concat (commandpart, "Supported");
 158                         if (this.Enabled)
 159                                 commandpart = string.Concat (commandpart, "|Enabled");
 160                         if (this.Visible)
 161                                 commandpart = string.Concat (commandpart, "|Visible");
 162                         if (this.Checked)
 163                                 commandpart = string.Concat (commandpart, "|Checked");
 164                         return commandpart;
 165                 }
 166
 167                 public event EventHandler CommandChanged;
 168         }
 169 }