Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;

import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;

public class Main {

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new HighlightLineTextPane());
        frame.setBounds(100, 100, 300, 400);
        frame.setVisible(true);
    }
}

class HighlightLineTextPane extends JTextPane {
    public HighlightLineTextPane() {
        setOpaque(false);
    }

    @Override
    protected void paintComponent(Graphics g) {
        g.setColor(getBackground());
        g.fillRect(0, 0, getWidth(), getHeight());
        try {
            Rectangle rect = modelToView(getCaretPosition());
            if (rect != null) {
                g.setColor(Color.RED);
                g.fillRect(0, rect.y, getWidth(), rect.height);
            }
        } catch (BadLocationException e) {
            System.out.println(e);
        }
        super.paintComponent(g);
    }

    @Override
    public void repaint(long tm, int x, int y, int width, int height) {
        super.repaint(tm, 0, 0, getWidth(), getHeight());
    }
}