ssdemo.java

来自「java 完全探索的随书源码」· Java 代码 · 共 62 行

// SSDemo.java

import javax.swing.*;
import javax.swing.event.*;

import java.awt.*;
import java.awt.event.*;

class SSDemo extends JFrame implements ChangeListener
{
   JLabel sliderValue;

   SSDemo (String title)
   {
      super (title);

      addWindowListener (new WindowAdapter ()
                         {
                             public void windowClosing (WindowEvent e)
                             {
                                System.exit (0);
                             }
                         });

      JSlider js = new JSlider (JSlider.VERTICAL, 0, 50, 25);
      js.setPaintTicks (true);
      js.setPaintLabels (true);
      js.setMajorTickSpacing (10);
      js.setMinorTickSpacing (5);
//      js.setSnapToTicks (true);
      js.addChangeListener (this);

      JPanel jp = new JPanel ();
      jp.add (js);
      getContentPane ().add (jp, BorderLayout.WEST);

      JScrollBar jsb = new JScrollBar (JScrollBar.VERTICAL, 25, 5,
                                       0, 50);

      jp = new JPanel ();
      jp.add (jsb);
      getContentPane ().add (jp, BorderLayout.EAST);

      sliderValue = new JLabel ("Value = 25");
      getContentPane ().add (sliderValue, BorderLayout.SOUTH);

      setSize (250, 250);
      setVisible (true);
   }

   public void stateChanged (ChangeEvent e)
   {
      sliderValue.setText ("Value = " + ((JSlider) e.getSource ())
                                                    .getValue ());
   }

   public static void main (String [] args)
   {
      new SSDemo ("Slider/Scrollbar Demo");
   }
}