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 // $Revision: 1.1 $
  27 // $Modtime: $
  28 // $Log: NativeWindow.cs,v $
  29 // Revision 1.1  2004/07/09 05:21:25  pbartok
  30 // - Initial check-in
  31 //
  32 //
  33
  34 // COMPLETE
  35
  36 using System.Runtime.Remoting;
  37 using System.Runtime.InteropServices;
  38 using System.Runtime.CompilerServices;
  39 using System.Collections;
  40 using System.Diagnostics;
  41
  42 namespace System.Windows.Forms
  43 {
  44         public class NativeWindow : MarshalByRefObject {
  45                 internal IntPtr                 window_handle;
  46                 static private Hashtable        window_collection = new Hashtable();
  47
  48                 #region Public Constructors
  49                 public NativeWindow() {
  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
  61                 public bool IsHandleCreated {
  62                         get {
  63                                 return (window_handle != IntPtr.Zero);
  64                         }
  65                 }
  66                 #endregion      // Public Instance Properties
  67
  68                 #region Public Static Methods
  69                 public static NativeWindow FromHandle(IntPtr handle) {
  70                         NativeWindow window=new NativeWindow();
  71
  72                         window.AssignHandle(handle);
  73                         return window;
  74                 }
  75                 #endregion      // Public Static Methods
  76
  77                 #region Public Instance Methods
  78                 public void AssignHandle(IntPtr handle) {
  79                         if (window_handle != IntPtr.Zero) {
  80                                 window_collection.Remove(window_handle);
  81                         }
  82                         window_handle=handle;
  83                         window_collection.Add(window_handle, this);
  84                         OnHandleChange();
  85                 }
  86
  87                 public virtual void CreateHandle(CreateParams create_params) {
  88                         if (create_params != null) {
  89                                 window_handle=XplatUI.CreateWindow(create_params);
  90
  91                                 if (window_handle != IntPtr.Zero) {
  92                                         window_collection.Add(window_handle, this);
  93                                 }
  94                         }
  95                 }
  96
  97                 public void DefWndProc(ref Message m) {
  98                         m.Result=XplatUI.DefWndProc(ref m);
  99                 }
 100
 101                 public virtual void DestroyHandle() {
 102                         window_collection.Remove(window_handle);
 103                         XplatUI.DestroyWindow(window_handle);
 104                         window_handle=IntPtr.Zero;
 105                 }
 106
 107                 public virtual void ReleaseHandle() {
 108                         window_handle=IntPtr.Zero;
 109                         OnHandleChange();
 110                 }
 111
 112                 #endregion      // Public Instance Methods
 113
 114                 #region Protected Instance Methods
 115                 ~NativeWindow() {
 116                         if (window_handle!=IntPtr.Zero) {
 117                                 DestroyHandle();
 118                         }
 119                 }
 120
 121                 protected virtual void OnHandleChange() {
 122                 }
 123
 124                 protected virtual void OnThreadException(Exception e) {
 125                         Application.OnThreadException(e);
 126                 }
 127
 128                 protected virtual void WndProc(ref Message m) {
 129 #if debug
 130                         Console.WriteLine("NativeWindow.cs: WndProc(ref Message m) called");
 131 #endif
 132                         DefWndProc(ref m);
 133                 }
 134
 135                 internal static IntPtr WndProc(IntPtr hWnd, Msg msg, IntPtr wParam, IntPtr lParam) {
 136                         Message         m = new Message();
 137                         NativeWindow    window = null;
 138
 139                         try {
 140                                 window = (NativeWindow)window_collection[hWnd];
 141                                 m.Hwnd=hWnd;
 142                                 m.Msg=(int)msg;
 143                                 m.WParam=wParam;
 144                                 m.LParam=lParam;
 145                                 m.Result=IntPtr.Zero;
 146
 147                                 if (window != null) {
 148                                         window.WndProc(ref m);
 149                                 } else {
 150                                         m.Result=XplatUI.DefWndProc(ref m);
 151                                 }
 152                         }
 153
 154                         catch(System.Exception ex) {
 155                                 if (window != null) {
 156                                         window.OnThreadException(ex);
 157                                 }
 158                         }
 159
 160 #if debug
 161                         Console.WriteLine("NativeWindow.cs: Message {0}, result {1}", msg, m.Result);
 162 #endif
 163
 164                         return m.Result;
 165                 }
 166                 #endregion      // Protected Instance Methods
 167         }
 168 }