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.swing.plaf.ButtonUI;
  43: 
  44: 
  45: /**
  46:  * An instance of JButton can be added to a panel, frame etc
  47:  *
  48:  * @author Ronald Veldema (rveldema@cs.vu.nl)
  49:  */
  50: public class JButton extends AbstractButton
  51:   implements Accessible
  52: {
  53:   private static final long serialVersionUID = -1907255238954382202L;
  54:   boolean def;
  55:   boolean is_def;
  56: 
  57:   public JButton()
  58:   {
  59:     this(null, null);
  60:   }
  61: 
  62:   public JButton(Action a)
  63:   {
  64:     this();
  65:     setAction(a);
  66:   }
  67: 
  68:   public JButton(Icon icon)
  69:   {
  70:     this(null, icon);
  71:   }
  72: 
  73:   public JButton(String text)
  74:   {
  75:     this(text, null);
  76:   }
  77: 
  78:   public JButton(String text, Icon icon)
  79:   {
  80:     super();
  81:     init(text, icon);
  82:     setModel(new DefaultButtonModel());
  83:   }
  84: 
  85:   public Object[] getSelectedObjects()
  86:   {
  87:     return null;
  88:   }
  89: 
  90:   protected void configurePropertiesFromAction(Action a)
  91:   {
  92:     // Factory method which sets the AbstractButton's properties according to
  93:     // values from the Action instance. 
  94:     super.configurePropertiesFromAction(a);
  95:   }
  96: 
  97:   public AccessibleContext getAccessibleContext()
  98:   {
  99:     // Gets the AccessibleContext associated with this JButton. 
 100:     return null;
 101:   }
 102: 
 103:   public String getUIClassID()
 104:   {
 105:     // Returns a string that specifies the name of the L&F class that renders
 106:     // this component.  
 107:     return "ButtonUI";
 108:   }
 109: 
 110:   public boolean isDefaultButton()
 111:   {
 112:     // Returns whether or not this button is the default button on the
 113:     // RootPane.
 114:     return is_def;
 115:   }
 116: 
 117:   public boolean isDefaultCapable()
 118:   {
 119:     // Returns whether or not this button is capable of being the default
 120:     // button on the RootPane. 
 121:     return def;
 122:   }
 123: 
 124:   protected String paramString()
 125:   {
 126:     String superParam = super.paramString();
 127: 
 128:     // 41 is the maximum number of chars which may be needed.
 129:     StringBuffer sb = new StringBuffer(41);
 130:     sb.append(",defaultButton=").append(is_def);
 131:     sb.append(",defaultCapable=").append(def);
 132: 
 133:     return superParam + sb.toString();
 134:   }
 135: 
 136:   /**
 137:    * Overrides JComponent.removeNotify to check if this button is currently
 138:    * set as the default button on the RootPane, and if so, sets the RootPane's
 139:    * default button to null to ensure the RootPane doesn't hold onto an invalid
 140:    * button reference.
 141:    */
 142:   public void removeNotify()
 143:   {
 144:   }
 145: 
 146:   public void setDefaultCapable(boolean defaultCapable)
 147:   {
 148:     def = defaultCapable;
 149:   }
 150: 
 151:   public void updateUI()
 152:   {
 153:     setUI((ButtonUI) UIManager.getUI(this));
 154:   }
 155: }