old-autovect-branch/libjava/classpath/gnu/java/awt/peer/gtk/GtkCheckboxPeer.java

   1 /* GtkCheckboxPeer.java -- Implements CheckboxPeer with GTK
   2    Copyright (C) 1998, 1999, 2002, 2003 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.Checkbox;
  42 import java.awt.CheckboxGroup;
  43 import java.awt.peer.CheckboxPeer;
  44
  45 public class GtkCheckboxPeer extends GtkComponentPeer
  46   implements CheckboxPeer
  47 {
  48   // Group from last time it was set.
  49   public GtkCheckboxGroupPeer old_group;
  50   // The current state of the GTK checkbox.
  51   private boolean currentState;
  52   private boolean changing = false;
  53
  54   public native void create (GtkCheckboxGroupPeer group);
  55   public native void nativeSetCheckboxGroup (GtkCheckboxGroupPeer group);
  56   public native void connectSignals ();
  57   native void gtkWidgetModifyFont (String name, int style, int size);
  58   native void gtkButtonSetLabel (String label);
  59   native void gtkToggleButtonSetActive (boolean is_active);
  60
  61   public GtkCheckboxPeer (Checkbox c)
  62   {
  63     super (c);
  64   }
  65
  66   // FIXME: we must be able to switch between a checkbutton and a
  67   // radiobutton dynamically.
  68   public void create ()
  69   {
  70     Checkbox checkbox = (Checkbox) awtComponent;
  71     CheckboxGroup g = checkbox.getCheckboxGroup ();
  72     old_group = GtkCheckboxGroupPeer.getCheckboxGroupPeer (g);
  73     create (old_group);
  74     gtkToggleButtonSetActive (checkbox.getState ());
  75     gtkButtonSetLabel (checkbox.getLabel ());
  76   }
  77
  78   public void setState (boolean state)
  79   {
  80     // prevent item_toggled_cb -> postItemEvent ->
  81     // awtComponent.setState -> this.setState ->
  82     // gtkToggleButtonSetActive self-deadlock on the GDK lock.
  83     if (changing && Thread.currentThread() == GtkToolkit.mainThread)
  84       {
  85         changing = false;
  86         return;
  87       }
  88
  89     if (currentState != state)
  90       gtkToggleButtonSetActive (state);
  91   }
  92
  93   public void setLabel (String label)
  94   {
  95     gtkButtonSetLabel (label);
  96   }
  97
  98   public void setCheckboxGroup (CheckboxGroup group)
  99   {
 100     GtkCheckboxGroupPeer gp
 101       = GtkCheckboxGroupPeer.getCheckboxGroupPeer (group);
 102     if (gp != old_group)
 103       {
 104         if (old_group != null)
 105           old_group.remove (this);
 106         nativeSetCheckboxGroup (gp);
 107         old_group = gp;
 108       }
 109   }
 110
 111   // Override the superclass postItemEvent so that the peer doesn't
 112   // need information that we have.
 113   // called back by native side: item_toggled_cb
 114   public void postItemEvent (Object item, int stateChange)
 115   {
 116     Checkbox currentCheckBox = ((Checkbox)awtComponent);
 117     // A firing of the event is only desired if the state has changed due to a
 118     // button press. The currentCheckBox's state must be different from the
 119     // one that the stateChange is changing to.
 120     // stateChange = 1 if it goes from false -> true
 121     // stateChange = 2 if it goes from true -> false
 122     if (( !currentCheckBox.getState() && stateChange == 1)
 123         || (currentCheckBox.getState() && stateChange == 2))
 124     {
 125       super.postItemEvent (awtComponent, stateChange);
 126       currentState = !currentCheckBox.getState();
 127       changing = true;
 128       currentCheckBox.setState(currentState);
 129     }
 130   }
 131
 132   public void dispose ()
 133   {
 134     // Notify the group so that the native state can be cleaned up
 135     // appropriately.
 136     if (old_group != null)
 137       old_group.remove (this);
 138     super.dispose ();
 139   }
 140 }