Standalone "About" dialog for apps that just run in the task tray.

AboutDialog.java

package space.forloop.stardew.desktop.system;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.NotNull;
import space.forloop.stardew.desktop.utils.ImageUtils;

@Slf4j
@UtilityClass
public class AboutDialog {

  private static final Font FONT = new JLabel().getFont();

  public void create(final String titleText, final String versionText, final String iconLocation) {
    final JPanel panel = createPanel();
    final JFrame frame = createFrame();
    final GridBagConstraints gridBag = createGridBag();

    addIcon(getImageIcon(iconLocation), panel, gridBag);
    addTitle(titleText, panel, gridBag);
    addVersion(versionText, panel, gridBag);

    frame.add(panel);
    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setAlwaysOnTop(true);
    frame.setVisible(true);
  }

  private void addIcon(
      final ImageIcon imageIcon, final JPanel panel, final GridBagConstraints gridBag) {
    final JLabel label = new JLabel("", SwingConstants.CENTER);
    label.setIcon(imageIcon);

    gridBag.gridx = 0;
    gridBag.gridy = 0;
    panel.add(label, gridBag);
  }

  private void addTitle(
      final String titleText, final JPanel panel, final GridBagConstraints gridBag) {
    final JLabel label = new JLabel(titleText, SwingConstants.CENTER);
    label.setFont(new Font(FONT.getName(), Font.PLAIN, 22));
    label.setBorder(new EmptyBorder(20, 0, 20, 0));

    gridBag.gridx = 0;
    gridBag.gridy = 1;
    panel.add(label, gridBag);
  }

  private void addVersion(
      final String versionText, final JPanel panel, final GridBagConstraints gridBag) {
    final JLabel label = new JLabel(versionText, SwingConstants.CENTER);
    label.setFont(new Font(FONT.getName(), Font.PLAIN, 12));

    gridBag.gridx = 0;
    gridBag.gridy = 2;
    panel.add(label, gridBag);
  }

  @NotNull
  private ImageIcon getImageIcon(final String iconLocation) {
    final Image icon = ImageUtils.loadImageFromResource(iconLocation, "Icon");
    final Image scaledInstance = icon.getScaledInstance(124, 124, Image.SCALE_SMOOTH);

    return new ImageIcon(scaledInstance);
  }

  @NotNull
  private JPanel createPanel() {
    final JPanel panel = new JPanel();
    panel.setLayout(new GridBagLayout());

    return panel;
  }

  @NotNull
  private JFrame createFrame() {
    final JFrame frame = new JFrame("About");
    frame.setPreferredSize(new Dimension(300, 300));
    frame.setResizable(false);

    return frame;
  }

  @NotNull
  private GridBagConstraints createGridBag() {
    final GridBagConstraints gridBagConstraints = new GridBagConstraints();
    gridBagConstraints.fill = GridBagConstraints.HORIZONTAL;

    return gridBagConstraints;
  }
}

example.png

ImageUtils.java

package space.forloop.stardew.desktop.utils;

import java.awt.*;
import java.io.IOException;
import java.net.URL;
import javax.swing.*;
import lombok.experimental.UtilityClass;
import org.springframework.core.io.ClassPathResource;

@UtilityClass
public class ImageUtils {

  public static Image loadImageFromResource(final String path, final String description) {

    try {
      final URL imageUrl = new ClassPathResource(path).getURL();

      return new ImageIcon(imageUrl, description).getImage();

    } catch (final IOException e) {
      throw new RuntimeException("Unable to load image from: " + path);
    }
  }
}