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ButtonGroup.java
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1998-06-30
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/*
* @(#)ButtonGroup.java 1.18 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.event.*;
import java.util.Vector;
import java.util.Enumeration;
import java.io.Serializable;
/**
* This class is used to create a multiple-exclusion scope for
* a set of buttons. Creating a set of buttons with the
* same ButtonGroup object means that turning "on" on of those buttons
* turns off all other buttons in the group. A ButtonGroup can be used with
* sets of JButton, JRadioButton, or JRadioButtonMenuItem objects.
* <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.
*
* @version 1.18 02/27/98
* @author Jeff Dinkins
*/
public class ButtonGroup implements Serializable {
// the list of buttons participating in this group
protected Vector buttons = new Vector();
/**
* The current choice.
*/
ButtonModel selection = null;
/**
* Creates a new ButtonGroup.
*/
public ButtonGroup() {}
/**
* Adds the button to the group.
*/
public void add(AbstractButton b) {
if(b == null) {
return;
}
buttons.addElement(b);
if(selection == null && b.isSelected()) {
selection = b.getModel();
}
b.getModel().setGroup(this);
}
/**
* Removes the button from the group.
*/
public void remove(AbstractButton b) {
if(b == null) {
return;
}
buttons.removeElement(b);
if(b.getModel() == selection) {
selection = null;
}
b.getModel().setGroup(null);
}
/**
* Return all the buttons that are participating in
* this group.
*/
public Enumeration getElements() {
return buttons.elements();
}
/**
* Return the selected button model.
*/
public ButtonModel getSelection() {
return selection;
}
/**
* Sets the selected value for the button.
*/
public void setSelected(ButtonModel m, boolean b) {
if(b && m != selection) {
ButtonModel oldSelection = selection;
selection = m;
if(oldSelection != null) {
oldSelection.setSelected(false);
}
}
}
/**
* Returns the selected value for the button.
*/
public boolean isSelected(ButtonModel m) {
return (m == selection);
}
}