MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.text.NavigationFilter;
import javax.swing.text.Position;

public class MainClass {
    public static void main(String args[]) throws Exception {
        final String START_STRING = "Start\n";
        final int START_STRING_LENGTH = START_STRING.length();

        JFrame frame = new JFrame("Navigation Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JTextArea textArea = new JTextArea(START_STRING);
        textArea.setCaretPosition(START_STRING_LENGTH);
        JScrollPane scrollPane = new JScrollPane(textArea);
        frame.add(scrollPane, BorderLayout.CENTER);

        NavigationFilter filter = new NavigationFilter() {
            public void setDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) {
                if (dot < START_STRING_LENGTH) {
                    fb.setDot(START_STRING_LENGTH, bias);
                } else {
                    fb.setDot(dot, bias);
                }
            }

            public void moveDot(NavigationFilter.FilterBypass fb, int dot, Position.Bias bias) {
                if (dot < START_STRING_LENGTH) {
                    fb.setDot(START_STRING_LENGTH, bias);
                } else {
                    fb.setDot(dot, bias);
                }
            }
        };

        textArea.setNavigationFilter(filter);

        frame.setSize(250, 150);
        frame.setVisible(true);
    }
}