mcs/class/Managed.Windows.Forms/System.Windows.Forms/NativeWindow.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) 2004-2006 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Peter Dennis Bartok     pbartok@novell.com
  24 //
  25
  26
  27 // COMPLETE
  28
  29 #define ExternalExceptionHandler
  30
  31 using System.Runtime.Remoting;
  32 using System.Runtime.InteropServices;
  33 using System.Runtime.CompilerServices;
  34 using System.Collections;
  35 using System.Diagnostics;
  36
  37 namespace System.Windows.Forms
  38 {
  39         public class NativeWindow : MarshalByRefObject {
  40                 internal IntPtr                 window_handle;
  41                 static internal Hashtable       window_collection = new Hashtable();
  42
  43                 #region Public Constructors
  44                 public NativeWindow() {
  45                         window_handle=IntPtr.Zero;
  46                 }
  47                 #endregion      // Public Constructors
  48
  49                 #region Public Instance Properties
  50                 public IntPtr Handle {
  51                         get {
  52                                 return window_handle;
  53                         }
  54                 }
  55                 #endregion      // Public Instance Properties
  56
  57                 #region Public Static Methods
  58                 public static NativeWindow FromHandle(IntPtr handle) {
  59                         NativeWindow window=new NativeWindow();
  60
  61                         window.AssignHandle(handle);
  62                         return window;
  63                 }
  64                 #endregion      // Public Static Methods
  65
  66                 #region Private and Internal Methods
  67                 internal static NativeWindow FindWindow(IntPtr handle) {
  68                         return (NativeWindow)window_collection[handle];
  69                 }
  70
  71                 internal void InvalidateHandle() {
  72                         window_collection.Remove(window_handle);
  73                         window_handle = IntPtr.Zero;
  74                 }
  75                 #endregion
  76
  77                 #region Public Instance Methods
  78                 public void AssignHandle(IntPtr handle) {
  79                         if (window_handle != IntPtr.Zero) {
  80                                 window_collection.Remove(window_handle);
  81                         }
  82                         window_handle=handle;
  83                         window_collection.Add(window_handle, this);
  84                         OnHandleChange();
  85                 }
  86
  87                 public virtual void CreateHandle(CreateParams create_params) {
  88                         if (create_params != null) {
  89                                 window_handle=XplatUI.CreateWindow(create_params);
  90
  91                                 if (window_handle != IntPtr.Zero) {
  92                                         window_collection.Add(window_handle, this);
  93                                 }
  94                         }
  95                 }
  96
  97                 public void DefWndProc(ref Message m) {
  98                         m.Result=XplatUI.DefWndProc(ref m);
  99                 }
 100
 101                 public virtual void DestroyHandle() {
 102                         if (window_handle != IntPtr.Zero) {
 103                                 XplatUI.DestroyWindow(window_handle);
 104                         }
 105                 }
 106
 107                 public virtual void ReleaseHandle() {
 108                         window_collection.Remove(window_handle);
 109                         window_handle=IntPtr.Zero;
 110                         OnHandleChange();
 111                 }
 112
 113                 #endregion      // Public Instance Methods
 114
 115                 #region Protected Instance Methods
 116                 ~NativeWindow() {
 117                 }
 118
 119                 protected virtual void OnHandleChange() {
 120                 }
 121
 122                 protected virtual void OnThreadException(Exception e) {
 123                         Application.OnThreadException(e);
 124                 }
 125
 126                 protected virtual void WndProc(ref Message m) {
 127                         DefWndProc(ref m);
 128                 }
 129
 130                 internal static IntPtr WndProc(IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) {
 131                         Message         m = new Message();
 132                         NativeWindow    window = null;
 133
 134                         #if !ExternalExceptionHandler
 135                         try {
 136                         #endif
 137                                 window = (NativeWindow)window_collection[hWnd];
 138                                 m.HWnd=hWnd;
 139                                 m.Msg=(int)msg;
 140                                 m.WParam=wParam;
 141                                 m.LParam=lParam;
 142                                 m.Result=IntPtr.Zero;
 143
 144                                 if (window != null) {
 145                                         window.WndProc(ref m);
 146                                 } else {
 147                                         m.Result=XplatUI.DefWndProc(ref m);
 148                                 }
 149                         #if !ExternalExceptionHandler
 150                         }
 151
 152                         catch(System.Exception ex) {
 153                                 if (window != null) {
 154                                         window.OnThreadException(ex);
 155                                 }
 156                         }
 157                         #endif
 158
 159                         #if debug
 160                                 Console.WriteLine("NativeWindow.cs: Message {0}, result {1}", msg, m.Result);
 161                         #endif
 162
 163                         return m.Result;
 164                 }
 165                 #endregion      // Protected Instance Methods
 166         }
 167 }