swing/action/StateChangeAction.java

/*
 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
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package com.sun.java.swing.action;

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.Icon;

// Referenced classes of package com.sun.java.swing.action:
//            DelegateAction

public abstract class StateChangeAction extends DelegateAction
    implements ItemListener
{

    public StateChangeAction(String name)
    {
        super(name, null);
        selected = false;
    }

    public StateChangeAction(String name, Icon icon)
    {
        super(name, icon);
        selected = false;
    }

    public boolean isSelected()
    {
        return selected;
    }

    public synchronized void setSelected(boolean newValue)
    {
        boolean oldValue = selected;
        if(oldValue != newValue)
        {
            selected = newValue;
            firePropertyChange("selected", Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
        }
    }

    public void setItemListener(ItemListener listener)
    {
        this.listener = listener;
    }

    public ItemListener getItemListener()
    {
        return listener;
    }

    public void itemStateChanged(ItemEvent evt)
    {
        if(evt.getStateChange() == 1)
            setSelected(true);
        else
            setSelected(false);
        if(listener != null)
            listener.itemStateChanged(evt);
    }

    protected boolean selected;
    private ItemListener listener;
}