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JRadioButton.java
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1998-06-30
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/*
* @(#)JRadioButton.java 1.42 98/02/27
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not disclose
* such Confidential Information and shall use it only in accordance with the
* terms of the license agreement you entered into with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
* OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
* LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR
* ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
import java.awt.*;
import java.awt.event.*;
import com.sun.java.swing.plaf.*;
import com.sun.java.swing.plaf.*;
import com.sun.java.accessibility.*;
/**
* An implementation of a radio button -- an item that can be selected or
* deselected, and which displays its state to the user.
* Used with a ButtonGroup object to create a group of buttons
* in which only one button at a time can be selected. (Create a ButtonGroup
* object and use its <code>add</code> method to include the JRadioButton objects
* in the group.)
* <p>
* See <a href="http://java.sun.com/docs/books/tutorial/ui/swing/radiobutton.html">How to Use Radio Buttons</a>
* in <a href="http://java.sun.com/Series/Tutorial/index.html"><em>The Java Tutorial</em></a>
* for further documentation.
* <p>
* For the keyboard keys used by this component in the standard Look and
* Feel (L&F) renditions, see the
* <a href="doc-files/Key-Index.html#JRadioButton">JRadioButton</a> key assignments.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*
* @beaninfo
* attribute: isContainer false
* @see ButtonGroup
* @see JCheckBox
* @version 1.42 02/27/98
* @author Jeff Dinkins
*/
public class JRadioButton extends JToggleButton implements Accessible {
/**
* Creates an initially unselected radio button
* with no set text.
*/
public JRadioButton () {
this(null, null, false);
}
/**
* Creates an initially unselected radio button
* with the specified image but no text.
*
* @param icon the image that the button should display
*/
public JRadioButton(Icon icon) {
this(null, icon, false);
}
/**
* Creates a radio button with the specified image
* and selection state, but no text.
*
* @param icon the image that the button should display
* @param selected if true, the button is initially selected;
* otherwise, the button is initially unselected
*/
public JRadioButton(Icon icon, boolean selected) {
this(null, icon, selected);
}
/**
* Creates an unselected radio button with the specified text.
*
* @param text the string displayed on the radio button
*/
public JRadioButton (String text) {
this(text, null, false);
}
/**
* Creates a radio button with the specified text
* and selection state.
*
* @param text the string displayed on the radio button
* @param selected if true, the button is initially selected;
* otherwise, the button is initially unselected
*/
public JRadioButton (String text, boolean selected) {
this(text, null, selected);
}
/**
* Creates a radio button that has the specified text and image,
* and that is initially unselected.
*
* @param text the string displayed on the radio button
* @param icon the image that the button should display
*/
public JRadioButton(String text, Icon icon) {
this(text, icon, false);
}
/**
* Creates a radio button that has the specified text, image,
* and selection state.
*
* @param text the string displayed on the radio button
* @param icon the image that the button should display
*/
public JRadioButton (String text, Icon icon, boolean selected) {
super(text, icon, selected);
setBorderPainted(false);
setHorizontalAlignment(LEFT);
}
/**
* Notification from the UIFactory that the L&F
* has changed.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((ButtonUI)UIManager.getUI(this));
}
/**
* Returns the name of the L&F class
* that renders this component.
*
* @return String "RadioButtonUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
* @beaninfo
* expert: true
* description: A string that specifies the name of the L&F class.
*/
public String getUIClassID() {
return "RadioButtonUI";
}
/////////////////
// Accessibility support
////////////////
/**
* Get the AccessibleContext associated with this JComponent
*
* @return the AccessibleContext of this JComponent
* @beaninfo
* expert: true
* description: The AccessibleContext associated with this Button
*/
public AccessibleContext getAccessibleContext() {
if (accessibleContext == null) {
accessibleContext = new AccessibleJRadioButton();
}
return accessibleContext;
}
/**
* The class used to obtain the accessible role for this object.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*/
protected class AccessibleJRadioButton extends AccessibleJToggleButton {
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public AccessibleRole getAccessibleRole() {
return AccessibleRole.RADIO_BUTTON;
}
} // inner class AccessibleJRadioButton
}