de.tbuchloh.kiskis.gui.widgets.PersistentTabPane.java Source code

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Here is the source code for de.tbuchloh.kiskis.gui.widgets.PersistentTabPane.java

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/*
 * Copyright (C) 2004 by Tobias Buchloh.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this program; if not, write to the Free
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.sourceforge.net/projects/KisKis
 */

package de.tbuchloh.kiskis.gui.widgets;

import java.awt.Component;
import java.util.prefs.Preferences;

import javax.swing.JTabbedPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * <b>PersistentTabPane</b>: remembers the last picked tab.
 * 
 * @author gandalf
 * @version $Id: PersistentTabPane.java,v 1.3 2007/02/18 14:37:34 tbuchloh Exp $
 */
public final class PersistentTabPane extends JTabbedPane {

    private static final Log LOG = LogFactory.getLog(PersistentTabPane.class);

    private static final Preferences P = Preferences.userNodeForPackage(PersistentTabPane.class);

    private static final long serialVersionUID = 6181212813889894420L;

    private String _id;

    /**
     * creates a new PersistentTabPane
     * 
     * @param id
     *            is the unique identifier for this tabbed pane.
     */
    public PersistentTabPane(final String id) {
        super();
        init(id);
    }

    /**
     * creates a new PersistentTabPane
     * 
     * @see JTabbedPane#JTabbedPane(int)
     */
    public PersistentTabPane(final String id, final int tabPlacement) {
        super(tabPlacement);
        init(id);
    }

    /**
     * creates a new PersistentTabPane
     * 
     * @see JTabbedPane#JTabbedPane(int, int)
     */
    public PersistentTabPane(final String id, final int tabPlacement, final int tabLayoutPolicy) {
        super(tabPlacement, tabLayoutPolicy);
        init(id);
    }

    /**
     * Overridden!
     * 
     * @see javax.swing.JTabbedPane#addTab(java.lang.String, java.awt.Component)
     */
    @Override
    public void addTab(final String title, final Component component) {
        super.addTab(title, component);
        showLastSelectedTab();
    }

    private String getId() {
        return _id + "#selectedIndex";
    }

    protected int getLastSelectedTab() {
        return P.getInt(getId(), 0);
    }

    private void init(final String id) {
        _id = id;
        this.getModel().addChangeListener(new ChangeListener() {

            private boolean _isActive;

            public void stateChanged(final ChangeEvent e) {
                if (_isActive && getSelectedIndex() != getLastSelectedTab()) {
                    setLastSelectedTab(getSelectedIndex());
                }
                _isActive = true;
            }
        });
    }

    protected void setLastSelectedTab(final int tab) {
        LOG.debug("storing selected tab=" + tab);
        P.putInt(getId(), tab);
    }

    private void showLastSelectedTab() {
        final int i = Math.max(0, getLastSelectedTab());
        // LOG.debug("show last selected tab=" + i);
        if (i < getTabCount()) {
            setSelectedIndex(i);
        }
    }
}