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

   1 // Permission is hereby granted, free of charge, to any person obtaining
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   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.Threading;
  35 using System.Collections;
  36 using System.Diagnostics;
  37
  38 namespace System.Windows.Forms
  39 {
  40         public class NativeWindow : MarshalByRefObject
  41 #if NET_2_0
  42                 , IWin32Window
  43 #endif
  44         {
  45                 internal IntPtr                 window_handle;
  46                 static internal Hashtable       window_collection = new Hashtable();
  47
  48                 [ThreadStatic]
  49                 static NativeWindow WindowCreating;
  50
  51                 #region Public Constructors
  52                 public NativeWindow()
  53                 {
  54                         window_handle=IntPtr.Zero;
  55                 }
  56                 #endregion      // Public Constructors
  57
  58                 #region Public Instance Properties
  59                 public IntPtr Handle {
  60                         get {
  61                                 return window_handle;
  62                         }
  63                 }
  64                 #endregion      // Public Instance Properties
  65
  66                 #region Public Static Methods
  67                 public static NativeWindow FromHandle(IntPtr handle)
  68                 {
  69                         NativeWindow window=new NativeWindow();
  70
  71                         window.AssignHandle(handle);
  72                         return window;
  73                 }
  74                 #endregion      // Public Static Methods
  75
  76                 #region Private and Internal Methods
  77                 internal static NativeWindow FindWindow(IntPtr handle)
  78                 {
  79                         NativeWindow rv;
  80                         lock (window_collection) {
  81                                 rv = (NativeWindow)window_collection[handle];
  82                         }
  83                         return rv;
  84                 }
  85
  86                 internal void InvalidateHandle()
  87                 {
  88                         lock (window_collection) {
  89                                 window_collection.Remove(window_handle);
  90                         }
  91                         window_handle = IntPtr.Zero;
  92                 }
  93                 #endregion
  94
  95                 #region Public Instance Methods
  96                 public void AssignHandle(IntPtr handle)
  97                 {
  98                         lock (window_collection) {
  99                                 if (window_handle != IntPtr.Zero)
 100                                         window_collection.Remove(window_handle);
 101                                 window_handle=handle;
 102                                 window_collection.Add(window_handle, this);
 103                         }
 104                         OnHandleChange();
 105                 }
 106
 107                 public virtual void CreateHandle(CreateParams cp)
 108                 {
 109                         if (cp != null) {
 110                                 WindowCreating = this;
 111
 112                                 window_handle=XplatUI.CreateWindow(cp);
 113
 114                                 WindowCreating = null;
 115
 116                                 if (window_handle != IntPtr.Zero) {
 117                                         lock (window_collection) {
 118                                                 window_collection[window_handle] = this;
 119                                         }
 120                                 }
 121                         }
 122
 123                 }
 124
 125                 public void DefWndProc(ref Message m)
 126                 {
 127                         m.Result=XplatUI.DefWndProc(ref m);
 128                 }
 129
 130                 public virtual void DestroyHandle()
 131                 {
 132                         if (window_handle != IntPtr.Zero) {
 133                                 XplatUI.DestroyWindow(window_handle);
 134                         }
 135                 }
 136
 137                 public virtual void ReleaseHandle()
 138                 {
 139                         lock (window_collection) {
 140                                 window_collection.Remove(window_handle);
 141                         }
 142                         window_handle=IntPtr.Zero;
 143                         OnHandleChange();
 144                 }
 145
 146                 #endregion      // Public Instance Methods
 147
 148                 #region Protected Instance Methods
 149                 ~NativeWindow()
 150                 {
 151                 }
 152
 153                 protected virtual void OnHandleChange()
 154                 {
 155                 }
 156
 157                 protected virtual void OnThreadException(Exception e)
 158                 {
 159                         Application.OnThreadException(e);
 160                 }
 161
 162                 protected virtual void WndProc(ref Message m)
 163                 {
 164                         DefWndProc(ref m);
 165                 }
 166
 167                 internal static IntPtr WndProc(IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam)
 168                 {
 169                         Message         m = new Message();
 170                         NativeWindow    window = null;
 171
 172 #if debug
 173                         Console.WriteLine("NativeWindow.cs ({0}, {1}, {2}, {3}): result {4}", hWnd, msg, wParam, lParam, m.Result);
 174 #endif
 175
 176
 177                         //try {
 178                                 lock (window_collection) {
 179                                         window = (NativeWindow)window_collection[hWnd];
 180                                 }
 181                                 m.HWnd=hWnd;
 182                                 m.Msg=(int)msg;
 183                                 m.WParam=wParam;
 184                                 m.LParam=lParam;
 185                                 m.Result=IntPtr.Zero;
 186
 187                                 if (window != null)
 188                                         window.WndProc(ref m);
 189                                 else if (WindowCreating != null) {
 190                                         // we need to do this AssignHandle here instead of relying on
 191                                         // Control.WndProc to do it, because subclasses can override
 192                                         // WndProc, install their own WM_CREATE block, and look at
 193                                         // this.Handle, and it needs to be set.  Otherwise, we end up
 194                                         // recursively creating windows and emitting WM_CREATE.
 195                                         window = WindowCreating;
 196                                         WindowCreating = null;
 197                                         if (window.window_handle == IntPtr.Zero)
 198                                                 window.AssignHandle (hWnd);
 199
 200                                         window.WndProc (ref m);
 201                                 }
 202                                 else
 203                                         m.Result=XplatUI.DefWndProc(ref m);
 204 //            }
 205 //            catch (Exception ex) {
 206 //#if !ExternalExceptionHandler
 207 //                if (window != null)
 208 //                    window.OnThreadException(ex);
 209 //#else
 210 //                throw;
 211 //#endif
 212 //            }
 213
 214                         #if debug
 215                                 Console.WriteLine("NativeWindow.cs: Message {0}, result {1}", msg, m.Result);
 216                         #endif
 217
 218                         return m.Result;
 219                 }
 220                 #endregion      // Protected Instance Methods
 221         }
 222 }