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An application to easily create syntax highlighting for custom languages in RSyntaxTextArea.

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package org.fife.tmm;

import java.awt.Color;
import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.util.Map;

import javax.swing.JComponent;

import org.fife.ui.rsyntaxtextarea.RSyntaxUtilities;


/**
 * Delineates sections of panels.  Displays the section name and a dividing
 * line.
 *
 * @author Robert Futrell
 * @version 1.0
 */
class Divider extends JComponent {

	private String text;


	Divider(String text) {
		this.text = text;
	}


	@Override
	public Dimension getPreferredSize() {
		FontMetrics fm = getFontMetrics(getFont());
		int width = fm.stringWidth(getText());
		int height = 25;
		return new Dimension(width, height);
	}


	public String getText() {
		return text;
	}


	@Override
	protected void paintComponent(Graphics g) {

		super.paintComponent(g);

		Graphics2D g2d = (Graphics2D)g;
		RenderingHints old = null;
		Map aaHints = RSyntaxUtilities.getDesktopAntiAliasHints();
		if (aaHints!=null) {
			old = g2d.getRenderingHints();
			g2d.addRenderingHints(aaHints);
		}

		String text = getText();
		g.setColor(Color.BLUE);
		Font font = javax.swing.UIManager.getFont("Label.font");
		FontMetrics fm = getFontMetrics(font);
		int titleWidth = fm.stringWidth(text);
		int middleY = getHeight()/2;
		int titleY = middleY + fm.getHeight()/2;

		ComponentOrientation orientation = getComponentOrientation();
		if (orientation.isLeftToRight()) {
			g.drawString(text, 0,titleY);
			g.setColor(getBackground().darker());
			g.drawLine(titleWidth+5, middleY, getWidth(), middleY);
		}
		else {
			int titleX = getWidth()-titleWidth-1;
			g.drawString(text, titleX,titleY);
			g.setColor(getBackground().darker());
			g.drawLine(0,middleY, titleX-5,middleY);
		}

		if (aaHints!=null) {
			g2d.setRenderingHints(old);
		}

	}


	public void setText(String text) {
		this.text = text;
		revalidate();
	}


}