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 : IDisposable
  30         {
  31                 #region Local Variables
  32                 Form main_form;
  33                 object tag;
  34                 bool thread_exit_raised;
  35
  36                 #endregion      // Local Variables
  37
  38                 #region Public Constructors & Destructors
  39                 public ApplicationContext() : this(null) {
  40                 }
  41
  42                 public ApplicationContext(Form mainForm) {
  43                         MainForm = mainForm; // Use  property to get event handling setup
  44                 }
  45
  46                 ~ApplicationContext() {
  47                         this.Dispose(false);
  48                 }
  49                 #endregion      // Public Constructors & Destructors
  50
  51                 #region Public Instance Properties
  52                 public Form MainForm {
  53                         get {
  54                                 return main_form;
  55                         }
  56
  57                         set {
  58                                 if (main_form != value) {
  59                                         // Catch when the form is destroyed so we can fire OnMainFormClosed
  60
  61                                         if (main_form != null) {
  62                                                 main_form.HandleDestroyed -= new EventHandler(OnMainFormClosed);
  63                                         }
  64                                         main_form = value;
  65                                         if (main_form != null) {
  66                                                 main_form.HandleDestroyed += new EventHandler(OnMainFormClosed);
  67                                         }
  68                                 }
  69                         }
  70                 }
  71
  72                 [BindableAttribute (true)]
  73                 [DefaultValue (null)]
  74                 [LocalizableAttribute (false)]
  75                 [TypeConverterAttribute (typeof(StringConverter))]
  76                 public Object Tag {
  77                         get { return tag; }
  78                         set { tag = value; }
  79                 }
  80                 #endregion      // Public Instance Properties
  81
  82                 #region Public Instance Methods
  83                 public void Dispose() {
  84                         Dispose(true);
  85                         GC.SuppressFinalize(this);
  86                 }
  87
  88                 public void ExitThread() {
  89                         ExitThreadCore();
  90                 }
  91                 #endregion      // Public Instance Methods
  92
  93                 #region Protected Instance Methods
  94                 protected virtual void Dispose(bool disposing) {
  95                         MainForm = null;
  96                         tag = null;
  97                 }
  98
  99                 protected virtual void ExitThreadCore() {
 100                         if (Application.MWFThread.Current.Context == this)
 101                                 XplatUI.PostQuitMessage(0);
 102                         if (!thread_exit_raised && ThreadExit != null) {
 103                                 thread_exit_raised = true;
 104                                 ThreadExit(this, EventArgs.Empty);
 105                         }
 106                 }
 107
 108                 protected virtual void OnMainFormClosed(object sender, EventArgs e) {
 109                         if (!MainForm.RecreatingHandle)
 110                                 ExitThreadCore();
 111                 }
 112                 #endregion      // Public Instance Methods
 113
 114                 #region Events
 115                 public event EventHandler ThreadExit;
 116                 #endregion      // Events
 117         }
 118 }