Source for gnu.java.awt.EmbeddedWindow

   1: /* EmbeddedWindow.java --
   2:    Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package gnu.java.awt;
  40: 
  41: import gnu.java.awt.peer.EmbeddedWindowPeer;
  42: import gnu.java.security.action.SetAccessibleAction;
  43: 
  44: import java.awt.Component;
  45: import java.awt.Frame;
  46: import java.awt.Toolkit;
  47: import java.lang.reflect.Field;
  48: import java.security.AccessController;
  49: 
  50: /**
  51:  * Represents an AWT window that can be embedded into another
  52:  * application.
  53:  * 
  54:  * @author Michael Koch (konqueror@gmx.de)
  55:  */
  56: public class EmbeddedWindow extends Frame
  57: {
  58:   private long handle;
  59:   
  60:   /**
  61:    * Creates a window to be embedded into another application.  The
  62:    * window will only be embedded after its setHandle method has been
  63:    * called.
  64:    */
  65:   public EmbeddedWindow ()
  66:   {
  67:     super();
  68:     this.handle = 0;
  69:   }
  70:   
  71:   /**
  72:    * Creates a window to be embedded into another application.
  73:    *
  74:    * @param handle the native handle to the screen area where the AWT
  75:    * window should be embedded
  76:    */
  77:   public EmbeddedWindow (long handle)
  78:   {
  79:     super();
  80:     this.handle = handle;
  81:   }
  82:   
  83:   /**
  84:    * Creates the native peer for this embedded window.
  85:    */
  86:   public void addNotify()
  87:   {
  88:     // Assume we're using ClasspathToolkit
  89:     ClasspathToolkit tk = (ClasspathToolkit) getToolkit();
  90: 
  91:     // Circumvent the package-privateness of the AWT internal
  92:     // java.awt.Component.peer member variable.
  93:     try
  94:       {
  95:     Field peerField = Component.class.getDeclaredField("peer");
  96:     AccessController.doPrivileged(new SetAccessibleAction(peerField));
  97:     peerField.set(this, tk.createEmbeddedWindow (this));
  98:       }
  99:     catch (IllegalAccessException e)
 100:       {
 101:         throw new AssertionError (e);
 102:       }
 103:     catch (NoSuchFieldException e)
 104:       {
 105:         throw new AssertionError (e);
 106:       }
 107: 
 108:     super.addNotify();
 109:   }
 110: 
 111:   /**
 112:    * If the native peer for this embedded window has been created,
 113:    * then setHandle will embed the window.  If not, setHandle tells
 114:    * us where to embed ourselves when our peer is created.
 115:    *
 116:    * @param handle the native handle to the screen area where the AWT
 117:    * window should be embedded
 118:    */
 119:   public void setHandle(long handle)
 120:   {
 121:     if (this.handle != 0)
 122:       throw new RuntimeException ("EmbeddedWindow is already embedded");
 123: 
 124:     this.handle = handle;
 125:     if (getPeer() != null)
 126:       ((EmbeddedWindowPeer) getPeer()).embed (this.handle);
 127:   }
 128: 
 129:   /**
 130:    * Gets the native handle of the screen area where the window will
 131:    * be embedded.
 132:    *
 133:    * @return The native handle that was passed to the constructor.
 134:    */
 135:   public long getHandle()
 136:   {
 137:     return handle;
 138:   }
 139: }