PreferenceManager.java

// OO jDREW - An Object Oriented extension of the Java Deductive Reasoning Engine for the Web
// Copyright (C) 2008 Ben Craig
//
// 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

package org.ruleml.oojdrew.GUI;

import java.util.Enumeration;
import java.util.prefs.PreferenceChangeEvent;
import java.util.prefs.PreferenceChangeListener;

import javax.swing.UIManager;
import javax.swing.plaf.FontUIResource;

import org.ruleml.oojdrew.Configuration;

public class PreferenceManager implements PreferenceChangeListener {
    private Configuration config;

    public PreferenceManager(Configuration config) {
        this.config = config;
        config.addPreferenceChangeListener(this);
        preferenceChange(null);
    }

    public void preferenceChange(PreferenceChangeEvent evt) {
        float newUIFontSize = config.getUIFontSize();
        float newTextAreaFontSize = config.getTextAreaFontSize();

        Enumeration<Object> keys = UIManager.getDefaults().keys();
        while (keys.hasMoreElements()) {
            Object key = keys.nextElement();
            Object value = UIManager.get(key);

            if (value instanceof javax.swing.plaf.FontUIResource) {
                javax.swing.plaf.FontUIResource font = (javax.swing.plaf.FontUIResource) value;
                FontUIResource newFont;

                if (key.toString().equals("TextArea.font")) {
                    newFont = new FontUIResource(
                            font.deriveFont(newTextAreaFontSize));
                } else {
                    newFont = new FontUIResource(font.deriveFont(newUIFontSize));
                }

                UIManager.put(key, newFont);
            }
        }

        try {
            UIManager.setLookAndFeel(config.getLookAndFeel());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}