Source for gnu.java.awt.peer.gtk.GtkGenericPeer

   1: /* GtkGenericPeer.java - Has a hashcode.  Yuck.
   2:    Copyright (C) 1998, 1999, 2002, 2006 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.peer.gtk;
  40: 
  41: import java.awt.EventQueue;
  42: import java.awt.Font;
  43: import java.awt.Toolkit;
  44: import java.awt.event.ActionEvent;
  45: 
  46: import gnu.classpath.Pointer;
  47: 
  48: public class GtkGenericPeer
  49: {
  50:   // Used by Native State Association (NSA) functions to map
  51:   // gtk_widget to peer object.
  52:   final int native_state = getUniqueInteger ();
  53: 
  54:   // Next native state value we will assign.
  55:   private static int next_native_state = 0;
  56: 
  57:   // The widget or other java-side object we wrap.
  58:   protected final Object awtWidget;
  59: 
  60:   /**
  61:    * The pointer to the native GTK widget.
  62:    *
  63:    * This field is manipulated by native code. Don't change or remove
  64:    * without adjusting the native code.
  65:    */
  66:   private Pointer widget;
  67: 
  68:   /**
  69:    * The pointer to the global reference to this object. The native
  70:    * code creates a JNI global reference of the peer object to be able
  71:    * to pass it to the event callbacks. It gets stored here, so that
  72:    * we can later delete it in the dispose() method.
  73:    *
  74:    * This field is manipulated by native code. Don't change or remove
  75:    * without adjusting the native code.
  76:    */
  77:   private Pointer globalRef;
  78: 
  79:   /**
  80:    * We initialize the field IDs that are used by native code here because
  81:    * these remain valid until a class gets unloaded.
  82:    */
  83:   static
  84:   {
  85:     GtkToolkit.initializeGlobalIDs();
  86:     initIDs();
  87:   }
  88: 
  89:   /**
  90:    * Initializes the field IDs that are used by the native code.
  91:    */
  92:   private static native void initIDs();
  93: 
  94:   /**
  95:    * Dispose of our native state.  Calls gtk_widget_destroy on the
  96:    * native widget and removes the awtWidget from the native state
  97:    * tables. Should be overridden by subclasses if this is not (all)
  98:    * that needs to be done.
  99:    */
 100:   public native void dispose ();
 101: 
 102:   static EventQueue q ()
 103:   {
 104:     return Toolkit.getDefaultToolkit ().getSystemEventQueue ();
 105:   }
 106: 
 107:   protected GtkGenericPeer (Object awtWidget)
 108:   {
 109:     this.awtWidget = awtWidget;
 110:   }
 111: 
 112:   protected void postActionEvent (String command, int mods)
 113:   {
 114:     q().postEvent (new ActionEvent (awtWidget, ActionEvent.ACTION_PERFORMED,
 115:                                   command, mods));
 116:   }
 117: 
 118:   // Return a unique integer for use in the native state mapping
 119:   // code.  We can't use a hash code since that is not guaranteed to
 120:   // be unique.
 121:   static synchronized int getUniqueInteger ()
 122:   {
 123:     // Let's assume this will never wrap.
 124:     return next_native_state++;
 125:   }
 126: 
 127:   /**
 128:    * Helper method to set Font for Gtk Widget.
 129:    */
 130:   protected void gtkWidgetModifyFont(Font f)
 131:   {
 132:     gtkWidgetModifyFont(f.getName(), f.getStyle(), f.getSize());
 133:   }
 134: 
 135:   /**
 136:    * Sets font for this Gtk Widget. Should be overridden by peers which
 137:    * are composed of different widgets or are contained in bins.
 138:    */
 139:   protected native void gtkWidgetModifyFont(String name, int style, int size);
 140: 
 141:   static void printCurrentThread ()
 142:   {
 143:     System.out.println ("gtkgenericpeer, thread: " + Thread.currentThread ());
 144:   }
 145: }