public static void main( String[] args ) {
	File file = new File( args.length > 0
		? args[0]
		: "theme-editor-test.properties" ); // TODO

	SwingUtilities.invokeLater( () -> {
		FlatLightLaf.install();

		FlatThemeFileEditor frame = new FlatThemeFileEditor();

		try {
			frame.themeEditorArea.load( FileLocation.create( file ) );
		} catch( IOException ex ) {
			ex.printStackTrace();
		}

		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		frame.setSize( Math.min( UIScale.scale( 800 ), screenSize.width ),
			screenSize.height - UIScale.scale( 100 ) );
		frame.setLocationRelativeTo( null );
		frame.setVisible( true );
	} );
}
 

private void applyTheme(String theme_) {
	try {
		if (theme_.equals("light")) {
			UIManager.setLookAndFeel(new FlatLightLaf());
		}
		else if (theme_.equals("dark")) {
			UIManager.setLookAndFeel(new FlatDarkLaf());
		}
		
		// Apply the new theme
		FlatLaf.updateUI();
	}
	catch (UnsupportedLookAndFeelException e1) {
		e1.printStackTrace();
	}
}
 

/**
 * Install L&Fs.
 */
public static void installLnfs() {
	// Flat LaF
	UIManager.installLookAndFeel("Flat Light", com.formdev.flatlaf.FlatLightLaf.class.getName());
	UIManager.installLookAndFeel("Flat Dark", com.formdev.flatlaf.FlatDarkLaf.class.getName());
	UIManager.installLookAndFeel("Flat IntelliJ", com.formdev.flatlaf.FlatIntelliJLaf.class.getName());
	UIManager.installLookAndFeel("Flat Darcula", com.formdev.flatlaf.FlatDarculaLaf.class.getName());

	// VAqua is optional
	if (OperatingSystem.isMacOs() && isVAquaAvailable()) {
		UIManager.installLookAndFeel("macOS (VAqua)", VAQUA_LAF_CLASS);
	}
}
 

/**
 * Use the appropriate look and feel for the current platform.
 *
 * @return Look and feel class name used
 */
public static String useLnfForPlatform() {
	String lnfClassName = null;

	if (OperatingSystem.isWindows()) {
		lnfClassName = UIManager.getSystemLookAndFeelClassName();
	} else if (OperatingSystem.isMacOs())  {
		if (isVAquaAvailable()){
			lnfClassName = VAQUA_LAF_CLASS;
		} else {
			lnfClassName = UIManager.getSystemLookAndFeelClassName();
		}
	} else {
		String xdgCurrentDesktop = System.getenv("XDG_CURRENT_DESKTOP");
		if ("Unity".equalsIgnoreCase(xdgCurrentDesktop)
				|| "XFCE".equalsIgnoreCase(xdgCurrentDesktop)
				|| "GNOME".equalsIgnoreCase(xdgCurrentDesktop)
				|| "X-Cinnamon".equalsIgnoreCase(xdgCurrentDesktop)
				|| "LXDE".equalsIgnoreCase(xdgCurrentDesktop)
				) {
			lnfClassName = UIManager.getSystemLookAndFeelClassName();
		} else {
			lnfClassName = FlatLightLaf.class.getName();
		}
	}

	useLnf(lnfClassName);

	return lnfClassName;
}
 

@Override
public void register(@Nonnull Consumer<UIManager.LookAndFeelInfo> consumer) {
  consumer.accept(LookAndFeelInfoWithClassLoader.simple("Flat Laf - Light", FlatLightLaf.class));
  consumer.accept(LookAndFeelInfoWithClassLoader.simple("Flat Laf - Dark", FlatDarkLaf.class));
  consumer.accept(LookAndFeelInfoWithClassLoader.simple("Flat Laf - IntelliJ", FlatIntelliJLaf.class));
  consumer.accept(LookAndFeelInfoWithClassLoader.simple("Flat Laf - Darcula", FlatDarculaLaf.class));
}
 

@Override
public void validate() throws IllegalStateException {
    UIManager.installLookAndFeel(new UIManager.LookAndFeelInfo(Bundle.LBL_FLATLAF_LIGHT(), FlatLightLaf.class.getName()));
    UIManager.installLookAndFeel(new UIManager.LookAndFeelInfo(Bundle.LBL_FLATLAF_DARK(), FlatDarkLaf.class.getName()));
}