scrollbar.java

来自「由于想一次上传成功 所以将二个教程打包成了一个 这些例子几乎包含了所有java的」· Java 代码 · 共 61 行

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

/*
<APPLET
    CODE=scrollbar.class
    WIDTH=300
    HEIGHT=200 >
</APPLET>
*/

public class scrollbar extends JApplet 
{
    private JScrollBar vsb = new JScrollBar(JScrollBar.VERTICAL, 0, 
        0, 0, 180);
    private jpanel j = new jpanel();

    public void init()
    {
        Container contentPane = getContentPane();

        contentPane.add(j, BorderLayout.CENTER);
        contentPane.add(vsb, BorderLayout.EAST);

        vsb.addAdjustmentListener(new AdjustmentListener() 
        {
            public void adjustmentValueChanged(
                                             AdjustmentEvent e) {
                JScrollBar sb = (JScrollBar)e.getSource();
                j.setScrolledPosition(e.getValue());
                j.repaint();
            }
        });
    }
}

class jpanel extends JPanel 
{ 
    JLabel jlabel = new JLabel("Hello from Swing!");
    int y = 0;

    jpanel()
    {
        jlabel = new JLabel("Hello from Swing!");
        add(jlabel);
    }

    public void paintComponent(Graphics g) 
    {
        super.paintComponent(g);

        jlabel.setLocation(0, y);
    }

    public void setScrolledPosition(int newposition)
    {
        y = newposition;
    }
}