propertieslist.java

The Definitive Guide to Java Swing, Third Edition by John Zukowski (Author) 源码

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class PropertiesList extends JList {

  SortedListModel model;
  Properties tipProps;

  public PropertiesList(Properties props) {
    model = new SortedListModel();
    setModel(model);
    ToolTipManager.sharedInstance().registerComponent(this);

    tipProps = props;
    addProperties(props);
  }
  private void addProperties(Properties props) {
    // Load
    Enumeration names = props.propertyNames();
    while (names.hasMoreElements()) {
      model.add(names.nextElement());
    }
  }
  public String getToolTipText(MouseEvent event) {
    Point p = event.getPoint();
    int location = locationToIndex(p);
    String key = (String)model.getElementAt(location);
    String tip = tipProps.getProperty(key);
    return tip;
  }
  public static void main (String args[]) {
    Runnable runner = new Runnable() {
      public void run() {
        JFrame frame = new JFrame("Custom Tip Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Properties props = System.getProperties();
        PropertiesList list = new PropertiesList(props);
        JScrollPane scrollPane = new JScrollPane(list);
        frame.add(scrollPane);
        frame.setSize(300, 300);
        frame.setVisible(true);
      }
    };
    EventQueue.invokeLater(runner);
  }
}