Java Swing How to - Add Element-Level Tooltips to JList Items

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Question

We would like to know how to add Element-Level Tooltips to JList Items.

Answer

/*from   ww w.j  a va 2s . c  o  m*/
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.util.Properties;

import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.ToolTipManager;

public class Main extends JList {

  public Main() {
    super(new String[]{ "A", "B", "C", "D", "E", "F", "G", "H" });
    ToolTipManager.sharedInstance().registerComponent(this);
  }

  public String getToolTipText(MouseEvent event) {
    Point p = event.getPoint();
    int location = locationToIndex(p);
    String tip = (String) getModel().getElementAt(location);
    return tip;
  }

  public static void main(String args[]) {
    JFrame frame = new JFrame("Custom Tip Demo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Main list = new Main();
    
    JScrollPane scrollPane = new JScrollPane(list);
    frame.add(scrollPane);
    frame.setSize(300, 300);
    frame.setVisible(true);
  }
}

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