highlighting the word in java

Question

I am triying to highlight a word, but only .length()-2 at 1st time,delay and then last 2 words.The first words are highlighted but it is not highlighting the last two words

Answer 1

You can achieve this with one Timer as well by simply adjusting the delay for the Timer. Just took the code from @DavidKroukamp and removed one of the Timer instances

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.atomic.AtomicBoolean;

public class KaraokeTest {

  private int[] timings = {2000, 4000, 0, 3000, 2000};//word timings
  private String[] words = {"Hel", "lo", " ", "wor", "ld"};//each indiviaul word
  private String sentence = "Hello world";//entire string for writing to JSCrollPane
  private DefaultHighlighter.DefaultHighlightPainter highlightPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW);
  private boolean fisrTime = true;
  private JFrame frame;
  private JTextPane jtp;
  private JButton startButton;
  private AtomicBoolean done = new AtomicBoolean(false);

  public KaraokeTest() {
    initComponents();
  }

  private void initComponents() {
    frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setResizable(false);

    jtp = new JTextPane();

    jtp.setText(sentence);
    jtp.setEditable(false);

    startButton = new JButton("Start");
    startButton.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent ae) {
        startKaraoke();
      }
    });

    frame.add(jtp, BorderLayout.CENTER);
    frame.add(startButton, BorderLayout.SOUTH);

    frame.pack();
    frame.setVisible(true);
  }

  private void startKaraoke() {
    if (fisrTime) {
      startButton.setEnabled(false);
      fisrTime = false;
    }

    Timer t = new Timer( timings[0], new ActionListener() {
      private int currentIndex = 0;
      @Override
      public void actionPerformed( ActionEvent e ) {
        clearHighlights();
        highlightWord( currentIndex );
        currentIndex++;
        if ( currentIndex < timings.length ){
          ( ( Timer ) e.getSource() ).setDelay( timings[currentIndex] );
          ( ( Timer ) e.getSource() ).restart();
        } else {
          ( ( Timer ) e.getSource() ).stop();
        }
      }
    } );
    t.setRepeats( true );

    t.start();
  }

  private void highlightWord( int index ){
    int sp = 0;
    for (int i = 0; i < index; i++) {
      sp += words[i].length();
    }
    try {
      jtp.getHighlighter().addHighlight(sp, sp + words[index].length(), highlightPainter);
    } catch (BadLocationException ex) {
      ex.printStackTrace();
    }
  }
  private void clearHighlights(){
    jtp.getHighlighter().removeAllHighlights();
  }

  public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
      @Override
      public void run() {
        new KaraokeTest();
      }
    });
  }
}