mcs/class/Managed.Windows.Forms/System.Windows.Forms/ApplicationContext.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2004 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Peter Bartok    pbartok@novell.com
  24 //
  25
  26 using System.ComponentModel;
  27
  28 namespace System.Windows.Forms {
  29         public class ApplicationContext
  30 #if NET_2_0
  31                 : IDisposable
  32 #endif
  33         {
  34                 #region Local Variables
  35                 Form main_form;
  36 #if NET_2_0
  37                 object tag;
  38 #endif
  39                 bool thread_exit_raised;
  40
  41                 #endregion      // Local Variables
  42
  43                 #region Public Constructors & Destructors
  44                 public ApplicationContext() : this(null) {
  45                 }
  46
  47                 public ApplicationContext(Form mainForm) {
  48                         MainForm = mainForm; // Use  property to get event handling setup
  49                 }
  50
  51                 ~ApplicationContext() {
  52                         this.Dispose(false);
  53                 }
  54                 #endregion      // Public Constructors & Destructors
  55
  56                 #region Public Instance Properties
  57                 public Form MainForm {
  58                         get {
  59                                 return main_form;
  60                         }
  61
  62                         set {
  63                                 if (main_form != value) {
  64                                         // Catch when the form is destroyed so we can fire OnMainFormClosed
  65
  66                                         if (main_form != null) {
  67                                                 main_form.HandleDestroyed -= new EventHandler(OnMainFormClosed);
  68                                         }
  69                                         main_form = value;
  70                                         if (main_form != null) {
  71                                                 main_form.HandleDestroyed += new EventHandler(OnMainFormClosed);
  72                                         }
  73                                 }
  74                         }
  75                 }
  76
  77 #if NET_2_0
  78                 [BindableAttribute (true)]
  79                 [DefaultValue (null)]
  80                 [LocalizableAttribute (false)]
  81                 [TypeConverterAttribute (typeof(StringConverter))]
  82                 public Object Tag {
  83                         get { return tag; }
  84                         set { tag = value; }
  85                 }
  86 #endif
  87                 #endregion      // Public Instance Properties
  88
  89                 #region Public Instance Methods
  90                 public void Dispose() {
  91                         Dispose(true);
  92                         GC.SuppressFinalize(this);
  93                 }
  94
  95                 public void ExitThread() {
  96                         ExitThreadCore();
  97                 }
  98                 #endregion      // Public Instance Methods
  99
 100                 #region Protected Instance Methods
 101                 protected virtual void Dispose(bool disposing) {
 102                         main_form = null;
 103 #if NET_2_0
 104                         tag = null;
 105 #endif
 106                 }
 107
 108                 protected virtual void ExitThreadCore() {
 109                         XplatUI.PostQuitMessage(0);
 110                         if (!thread_exit_raised && ThreadExit != null) {
 111                                 thread_exit_raised = true;
 112                                 ThreadExit(this, EventArgs.Empty);
 113                         }
 114                 }
 115
 116                 protected virtual void OnMainFormClosed(object sender, EventArgs e) {
 117                         if (!MainForm.RecreatingHandle)
 118                                 ExitThreadCore();
 119                 }
 120                 #endregion      // Public Instance Methods
 121
 122                 #region Events
 123                 public event EventHandler ThreadExit;
 124                 #endregion      // Events
 125         }
 126 }