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DockingFrames is an open source Java Swing docking framework, licenced under LGPL 2.1. This is the same distribution as the original distribution (http://www.docking-frames.org/), only reinstalled in maven

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/*
 * Bibliothek - DockingFrames
 * Library built on Java/Swing, allows the user to "drag and drop"
 * panels containing any Swing-Component the developer likes to add.
 * 
 * Copyright (C) 2007 Benjamin Sigg
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Benjamin Sigg
 * [email protected]
 * CH - Switzerland
 */
package bibliothek.gui.dock.common.action;

import java.util.Set;

import javax.swing.Icon;
import javax.swing.JRadioButton;

import bibliothek.gui.Dockable;
import bibliothek.gui.dock.action.SelectableDockAction;
import bibliothek.gui.dock.common.action.core.CommonSimpleRadioAction;
import bibliothek.gui.dock.common.intern.action.CSelectableAction;
import bibliothek.gui.dock.event.SelectableDockActionListener;
import bibliothek.util.FrameworkOnly;

/**
 * An action which behaves like a {@link JRadioButton}.

 * Several {@link CRadioButton}s can be added to a {@link CRadioGroup}, only
 * one {@link CRadioButton} of such a group will be selected.
 * @author Benjamin Sigg
 */
public abstract class CRadioButton extends CSelectableAction {
    /** group to which this button belongs */
    private CRadioGroup group;
    
    /**
     * Creates a new radiobutton
     */
    public CRadioButton() {
        super( null );
        init( new CommonSimpleRadioAction( this ));
    }
    
    /**
     * Creates a new radiobutton using action as internal representation
     * @param action the internal representation, can be null in which case
     * subclasses should call {@link #init(CommonSimpleRadioAction)}
     */
    protected CRadioButton( CommonSimpleRadioAction action ){
    	super( null );
    	if( action != null ){
    		init( action );
    	}
    }
    
    /**
     * Creates a new radiobutton
     * @param text the text of this button
     * @param icon the icon of this button
     */
    public CRadioButton( String text, Icon icon ){
        this();
        setText( text );
        setIcon( icon );
    }
    
    @Override
    protected void init( CommonSimpleRadioAction action ) {
    	super.init( action );
    	action.addSelectableListener( new SelectableDockActionListener(){
    		public void selectedChanged( SelectableDockAction action, Set dockables ) {
    			if( isSelected() && group != null )
    				group.selected( CRadioButton.this );
    		}
    	});
    }
    
    /**
     * Sets the group to which this button belongs.
     * @param group the group
     */
    @FrameworkOnly
    void setGroup( CRadioGroup group ) {
        this.group = group;
    }
}