src/main/java/org/apache/log4j/chainsaw/components/splash/ChainsawSplash.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.log4j.chainsaw.components.splash;

import java.awt.*;
import java.util.HashSet;
import java.util.Set;
import javax.swing.*;
import org.apache.log4j.chainsaw.icons.ChainsawIcons;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * A simple splash screen to be used at startup, while everything get's initialized.
 *
 * @author Paul Smith <psmith@apache.org>
 */
class ChainsawSplash extends JWindow {
    private static final Logger logger = LogManager.getLogger();

    ChainsawSplash(Frame owner) {
        super(owner);

        Container container = getContentPane();
        JPanel panel = new JPanel(new BorderLayout());

        JLabel logo = new JLabel(ChainsawIcons.ICON_LOG4J);

        JLabel text = new JLabel("Chainsaw v2", SwingConstants.CENTER);
        Font textFont = null;
        String[] preferredFontNames = new String[] {"Arial", "Helvetica", "SansSerif"};

        Set<String> availableFontNames = new HashSet<>();
        Font[] allFonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();

        for (Font allFont : allFonts) {
            availableFontNames.add(allFont.getName());
        }

        for (String preferredFontName : preferredFontNames) {
            if (availableFontNames.contains(preferredFontName)) {
                textFont = new Font(preferredFontName, Font.PLAIN, 12);
                logger.debug("Using font={}", textFont.getName());
                break;
            }
        }

        if (textFont == null) {
            logger.debug("Using basic font");
            textFont = text.getFont();
        }

        text.setFont(textFont.deriveFont(16f).deriveFont(Font.BOLD));
        text.setBackground(Color.white);
        text.setForeground(Color.black);
        text.setBorder(BorderFactory.createLoweredBevelBorder());
        panel.add(logo, BorderLayout.CENTER);
        panel.add(text, BorderLayout.SOUTH);
        panel.setBorder(BorderFactory.createLineBorder(Color.black, 1));

        container.add(panel);
        pack();
    }
}