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