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 Novell, Inc.
  21 //
  22 // Authors:
  23 //      Peter 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 Static Methods
  67                 internal static NativeWindow FindWindow(IntPtr handle) {
  68                         return (NativeWindow)window_collection[handle];
  69
  70                 }
  71                 #endregion
  72
  73                 #region Public Instance Methods
  74                 public void AssignHandle(IntPtr handle) {
  75                         if (window_handle != IntPtr.Zero) {
  76                                 window_collection.Remove(window_handle);
  77                         }
  78                         window_handle=handle;
  79                         window_collection.Add(window_handle, this);
  80                         OnHandleChange();
  81                 }
  82
  83                 public virtual void CreateHandle(CreateParams create_params) {
  84                         if (create_params != null) {
  85                                 window_handle=XplatUI.CreateWindow(create_params);
  86
  87                                 if (window_handle != IntPtr.Zero) {
  88                                         window_collection.Add(window_handle, this);
  89                                 }
  90                         }
  91                 }
  92
  93                 public void DefWndProc(ref Message m) {
  94                         m.Result=XplatUI.DefWndProc(ref m);
  95                 }
  96
  97                 public virtual void DestroyHandle() {
  98                         window_collection.Remove(window_handle);
  99                         XplatUI.DestroyWindow(window_handle);
 100                         window_handle=IntPtr.Zero;
 101                 }
 102
 103                 public virtual void ReleaseHandle() {
 104                         window_handle=IntPtr.Zero;
 105                         OnHandleChange();
 106                 }
 107
 108                 #endregion      // Public Instance Methods
 109
 110                 #region Protected Instance Methods
 111                 ~NativeWindow() {
 112                         if (window_handle!=IntPtr.Zero) {
 113                                 DestroyHandle();
 114                         }
 115                 }
 116
 117                 protected virtual void OnHandleChange() {
 118                 }
 119
 120                 protected virtual void OnThreadException(Exception e) {
 121                         Application.OnThreadException(e);
 122                 }
 123
 124                 protected virtual void WndProc(ref Message m) {
 125                         DefWndProc(ref m);
 126                 }
 127
 128                 internal static IntPtr WndProc(IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) {
 129                         Message         m = new Message();
 130                         NativeWindow    window = null;
 131
 132                         #if !ExternalExceptionHandler
 133                         try {
 134                         #endif
 135                                 window = (NativeWindow)window_collection[hWnd];
 136                                 m.HWnd=hWnd;
 137                                 m.Msg=(int)msg;
 138                                 m.WParam=wParam;
 139                                 m.LParam=lParam;
 140                                 m.Result=IntPtr.Zero;
 141
 142                                 if (window != null) {
 143                                         window.WndProc(ref m);
 144                                 } else {
 145                                         m.Result=XplatUI.DefWndProc(ref m);
 146                                 }
 147                         #if !ExternalExceptionHandler
 148                         }
 149
 150                         catch(System.Exception ex) {
 151                                 if (window != null) {
 152                                         window.OnThreadException(ex);
 153                                 }
 154                         }
 155                         #endif
 156
 157                         #if debug
 158                                 Console.WriteLine("NativeWindow.cs: Message {0}, result {1}", msg, m.Result);
 159                         #endif
 160
 161                         return m.Result;
 162                 }
 163                 #endregion      // Protected Instance Methods
 164         }
 165 }