Source for javax.swing.JButton

   1: /* JButton.java --
   2:    Copyright (C) 2002, 2004, 2005 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: package javax.swing;
  39: 
  40: import javax.accessibility.Accessible;
  41: import javax.accessibility.AccessibleContext;
  42: import javax.accessibility.AccessibleRole;
  43: import javax.swing.plaf.ButtonUI;
  44: 
  45: 
  46: /**
  47:  * A general purpose push button. <code>JButton</code>s can display a label,
  48:  * an {@link Icon} or both.
  49:  *
  50:  * @author Ronald Veldema (rveldema@cs.vu.nl)
  51:  */
  52: public class JButton extends AbstractButton
  53:   implements Accessible
  54: {
  55: 
  56:   /**
  57:    * Accessibility support for JButtons.
  58:    */
  59:   protected class AccessibleJButton
  60:     extends AbstractButton.AccessibleAbstractButton
  61:   {
  62:     /**
  63:      * Returns the accessible role that this component represents.
  64:      * This is {@link AccessibleRole#PUSH_BUTTON} for <code>JButton</code>s.
  65:      *
  66:      * @return the accessible role that this component represents
  67:      */
  68:     public AccessibleRole getAccessibleRole()
  69:     {
  70:       return AccessibleRole.PUSH_BUTTON;
  71:     }
  72:   }
  73: 
  74:   private static final long serialVersionUID = -1907255238954382202L;
  75:   boolean def;
  76:   boolean is_def;
  77: 
  78:   /** The AccessibleContext for this JButton. */
  79:   AccessibleJButton accessibleContext;
  80: 
  81:   public JButton()
  82:   {
  83:     this(null, null);
  84:   }
  85: 
  86:   public JButton(Action a)
  87:   {
  88:     this();
  89:     setAction(a);
  90:   }
  91: 
  92:   public JButton(Icon icon)
  93:   {
  94:     this(null, icon);
  95:   }
  96: 
  97:   public JButton(String text)
  98:   {
  99:     this(text, null);
 100:   }
 101: 
 102:   public JButton(String text, Icon icon)
 103:   {
 104:     super();
 105:     init(text, icon);
 106:     setModel(new DefaultButtonModel());
 107:   }
 108: 
 109:   public Object[] getSelectedObjects()
 110:   {
 111:     return null;
 112:   }
 113: 
 114:   protected void configurePropertiesFromAction(Action a)
 115:   {
 116:     // Factory method which sets the AbstractButton's properties according to
 117:     // values from the Action instance. 
 118:     super.configurePropertiesFromAction(a);
 119:   }
 120: 
 121:   public AccessibleContext getAccessibleContext()
 122:   {
 123:     if (accessibleContext == null)
 124:       accessibleContext = new AccessibleJButton();
 125:     return accessibleContext;
 126:   }
 127: 
 128:   public String getUIClassID()
 129:   {
 130:     // Returns a string that specifies the name of the L&F class that renders
 131:     // this component.  
 132:     return "ButtonUI";
 133:   }
 134: 
 135:   public boolean isDefaultButton()
 136:   {
 137:     // Returns whether or not this button is the default button on the
 138:     // RootPane.
 139:     return is_def;
 140:   }
 141: 
 142:   public boolean isDefaultCapable()
 143:   {
 144:     // Returns whether or not this button is capable of being the default
 145:     // button on the RootPane. 
 146:     return def;
 147:   }
 148: 
 149:   protected String paramString()
 150:   {
 151:     String superParam = super.paramString();
 152: 
 153:     // 41 is the maximum number of chars which may be needed.
 154:     StringBuffer sb = new StringBuffer(41);
 155:     sb.append(",defaultButton=").append(is_def);
 156:     sb.append(",defaultCapable=").append(def);
 157: 
 158:     return superParam + sb.toString();
 159:   }
 160: 
 161:   /**
 162:    * Overrides JComponent.removeNotify to check if this button is currently
 163:    * set as the default button on the RootPane, and if so, sets the RootPane's
 164:    * default button to null to ensure the RootPane doesn't hold onto an invalid
 165:    * button reference.
 166:    */
 167:   public void removeNotify()
 168:   {
 169:   }
 170: 
 171:   public void setDefaultCapable(boolean defaultCapable)
 172:   {
 173:     def = defaultCapable;
 174:   }
 175: 
 176:   public void updateUI()
 177:   {
 178:     setUI((ButtonUI) UIManager.getUI(this));
 179:   }
 180: }