toolchain/gcc/libjava/javax/swing/JButton.java

   1 /* JButton.java --
   2    Copyright (C) 2002, 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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 package javax.swing;
  39
  40 import javax.accessibility.Accessible;
  41 import javax.accessibility.AccessibleContext;
  42 import javax.swing.plaf.ButtonUI;
  43
  44 /**
  45  * An instance of JButton can be added to a panel, frame etc
  46  *
  47  * @author Ronald Veldema (rveldema@cs.vu.nl)
  48  */
  49 public class JButton extends AbstractButton implements Accessible
  50 {
  51   private static final long serialVersionUID = -1907255238954382202L;
  52
  53     boolean def, is_def;
  54
  55
  56     public JButton()
  57     {
  58         this(null, null);
  59     }
  60
  61     public JButton(Action a)
  62     {
  63         this();
  64         setAction(a);
  65     }
  66
  67     public JButton(Icon icon)
  68     {
  69         this(null, icon);
  70     }
  71
  72     public JButton(String text)
  73     {
  74         this(text, null);
  75     }
  76
  77     public JButton(String text, Icon icon)
  78     {
  79         super(text, icon);
  80     }
  81
  82     public Object[] getSelectedObjects()
  83     {
  84         return null;
  85     }
  86
  87     protected  void configurePropertiesFromAction(Action a)
  88     {
  89         //Factory method which sets the AbstractButton's properties according to values from the Action instance.
  90     }
  91
  92     public AccessibleContext getAccessibleContext()
  93     {
  94         //Gets the AccessibleContext associated with this JButton.
  95         return null;
  96     }
  97
  98     public String getUIClassID()
  99     {
 100         //Returns a string that specifies the name of the L&F class that renders this component.
 101         return "JButton";
 102     }
 103
 104     public boolean isDefaultButton()
 105     {
 106         //Returns whether or not this button is the default button on the RootPane.
 107         return is_def;
 108     }
 109
 110     public boolean isDefaultCapable()
 111     {
 112         //Returns whether or not this button is capable of being the default button on the RootPane.
 113         return def;
 114     }
 115
 116     protected  String paramString()
 117     {
 118         return "JButton";
 119     }
 120
 121     public void removeNotify()
 122     {
 123         //Overrides JComponent.removeNotify to check if this button is currently set as the default button on the RootPane, and if so, sets the RootPane's default button to null to ensure the RootPane doesn't hold onto an invalid button reference.
 124     }
 125
 126     public void setDefaultCapable(boolean defaultCapable)
 127     {   def = defaultCapable;    }
 128
 129     public void updateUI()
 130     {
 131         ButtonUI b = (ButtonUI)UIManager.getUI(this);
 132         setUI(b);
 133     }
 134 }