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
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   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                         NativeWindow rv;
  69                         lock (window_collection) {
  70                                 rv = (NativeWindow)window_collection[handle];
  71                         }
  72                         return rv;
  73                 }
  74
  75                 internal void InvalidateHandle() {
  76                         lock (window_collection) {
  77                                 window_collection.Remove(window_handle);
  78                         }
  79                         window_handle = IntPtr.Zero;
  80                 }
  81                 #endregion
  82
  83                 #region Public Instance Methods
  84                 public void AssignHandle(IntPtr handle) {
  85                         lock (window_collection) {
  86                                 if (window_handle != IntPtr.Zero) {
  87                                         window_collection.Remove(window_handle);
  88                                 }
  89                                 window_handle=handle;
  90                                 window_collection.Add(window_handle, this);
  91                         }
  92                         OnHandleChange();
  93                 }
  94
  95                 public virtual void CreateHandle(CreateParams create_params) {
  96                         if (create_params != null) {
  97                                 window_handle=XplatUI.CreateWindow(create_params);
  98
  99                                 if (window_handle != IntPtr.Zero) {
 100                                         lock (window_collection) {
 101                                                 window_collection.Add(window_handle, this);
 102                                         }
 103                                 }
 104                         }
 105                 }
 106
 107                 public void DefWndProc(ref Message m) {
 108                         m.Result=XplatUI.DefWndProc(ref m);
 109                 }
 110
 111                 public virtual void DestroyHandle() {
 112                         if (window_handle != IntPtr.Zero) {
 113                                 XplatUI.DestroyWindow(window_handle);
 114                         }
 115                 }
 116
 117                 public virtual void ReleaseHandle() {
 118                         lock (window_collection) {
 119                                 window_collection.Remove(window_handle);
 120                         }
 121                         window_handle=IntPtr.Zero;
 122                         OnHandleChange();
 123                 }
 124
 125                 #endregion      // Public Instance Methods
 126
 127                 #region Protected Instance Methods
 128                 ~NativeWindow() {
 129                 }
 130
 131                 protected virtual void OnHandleChange() {
 132                 }
 133
 134                 protected virtual void OnThreadException(Exception e) {
 135                         Application.OnThreadException(e);
 136                 }
 137
 138                 protected virtual void WndProc(ref Message m) {
 139                         DefWndProc(ref m);
 140                 }
 141
 142                 internal static IntPtr WndProc(IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) {
 143                         Message         m = new Message();
 144                         NativeWindow    window = null;
 145
 146                         #if !ExternalExceptionHandler
 147                         try {
 148                         #endif
 149                                 lock (window_collection) {
 150                                         window = (NativeWindow)window_collection[hWnd];
 151                                 }
 152                                 m.HWnd=hWnd;
 153                                 m.Msg=(int)msg;
 154                                 m.WParam=wParam;
 155                                 m.LParam=lParam;
 156                                 m.Result=IntPtr.Zero;
 157
 158                                 if (window != null) {
 159                                         window.WndProc(ref m);
 160                                 } else {
 161                                         m.Result=XplatUI.DefWndProc(ref m);
 162                                 }
 163                         #if !ExternalExceptionHandler
 164                         }
 165
 166                         catch(System.Exception ex) {
 167                                 if (window != null) {
 168                                         window.OnThreadException(ex);
 169                                 }
 170                         }
 171                         #endif
 172
 173                         #if debug
 174                                 Console.WriteLine("NativeWindow.cs: Message {0}, result {1}", msg, m.Result);
 175                         #endif
 176
 177                         return m.Result;
 178                 }
 179                 #endregion      // Protected Instance Methods
 180         }
 181 }