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