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.lang.reflect.Field;
  47: import java.security.AccessController;
  48: 
  49: /**
  50:  * Represents an AWT window that can be embedded into another
  51:  * application.
  52:  *
  53:  * @author Michael Koch (konqueror@gmx.de)
  54:  */
  55: public class EmbeddedWindow extends Frame
  56: {
  57:   private long handle;
  58: 
  59:   /**
  60:    * Creates a window to be embedded into another application.  The
  61:    * window will only be embedded after its setHandle method has been
  62:    * called.
  63:    */
  64:   public EmbeddedWindow ()
  65:   {
  66:     super();
  67:     this.handle = 0;
  68:   }
  69: 
  70:   /**
  71:    * Creates a window to be embedded into another application.
  72:    *
  73:    * @param handle the native handle to the screen area where the AWT
  74:    * window should be embedded
  75:    */
  76:   public EmbeddedWindow (long handle)
  77:   {
  78:     super();
  79:     this.handle = handle;
  80:   }
  81: 
  82:   /**
  83:    * Creates the native peer for this embedded window.
  84:    */
  85:   public void addNotify()
  86:   {
  87:     // Assume we're using ClasspathToolkit
  88:     ClasspathToolkit tk = (ClasspathToolkit) getToolkit();
  89: 
  90:     // Circumvent the package-privateness of the AWT internal
  91:     // java.awt.Component.peer member variable.
  92:     try
  93:       {
  94:         Field peerField = Component.class.getDeclaredField("peer");
  95:         AccessController.doPrivileged(new SetAccessibleAction(peerField));
  96:         peerField.set(this, tk.createEmbeddedWindow (this));
  97:       }
  98:     catch (IllegalAccessException e)
  99:       {
 100:         throw new AssertionError (e);
 101:       }
 102:     catch (NoSuchFieldException e)
 103:       {
 104:         throw new AssertionError (e);
 105:       }
 106: 
 107:     super.addNotify();
 108:   }
 109: 
 110:   /**
 111:    * If the native peer for this embedded window has been created,
 112:    * then setHandle will embed the window.  If not, setHandle tells
 113:    * us where to embed ourselves when our peer is created.
 114:    *
 115:    * @param handle the native handle to the screen area where the AWT
 116:    * window should be embedded
 117:    */
 118:   public void setHandle(long handle)
 119:   {
 120:     if (this.handle != 0)
 121:       throw new RuntimeException ("EmbeddedWindow is already embedded");
 122: 
 123:     this.handle = handle;
 124:     if (getPeer() != null)
 125:       ((EmbeddedWindowPeer) getPeer()).embed (this.handle);
 126:   }
 127: 
 128:   /**
 129:    * Gets the native handle of the screen area where the window will
 130:    * be embedded.
 131:    *
 132:    * @return The native handle that was passed to the constructor.
 133:    */
 134:   public long getHandle()
 135:   {
 136:     return handle;
 137:   }
 138: }