时间：2019-10-07
概述：JScrollPane 滚动条
在Java中使用JScrollPane的例子，特别是滚动条的设置等，程序代码中将设置水平与垂直表头、设置scrollPane的边角图案、设置scrollPane的边框凹陷立体边框。适时水平滚动轴的参数设置等内容：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class JScrollPaneDemo implements ActionListener {
private JScrollPane scrollPane;
public JScrollPaneDemo() {
JFrame f = new JFrame("JScrollPaneDemo");
Container contentPane = f.getContentPane();
JLabel label1 = new JLabel(new ImageIcon(".\\icons\\Hill.jpg"));
JPanel panel1 = new JPanel();
panel1.add(label1);
scrollPane = new JScrollPane();
//设置窗口显示的内容窗格为panel1
scrollPane.setViewportView(panel1);
//设置水平与垂直表头
scrollPane.setColumnHeaderView(new JLabel("水平表头"));
scrollPane.setRowHeaderView(new JLabel("垂直表头"));
//设置scrollPane的边框凹陷立体边框。
scrollPane.setViewportBorder(BorderFactory
.createBevelBorder(BevelBorder.LOWERED));
//设置scrollPane的边角图案
scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, new JLabel(
new ImageIcon(".\\icons\\Sunset.jpg")));
scrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, new JLabel(
new ImageIcon(".\\icons\\Sunset.jpg")));
JPanel panel2 = new JPanel(new GridLayout(3, 1));
JButton b = new JButton("显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("不要显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
b = new JButton("适时显示水平滚动轴");
b.addActionListener(this);
panel2.add(b);
contentPane.add(panel2, BorderLayout.WEST);
contentPane.add(scrollPane, BorderLayout.CENTER);
f.setSize(new Dimension(350, 220));
f.show();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("显示水平滚动轴")) {
scrollPane.setHorizontalScrollBarPolicy
(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
}
if (e.getActionCommand().equals("不要显示水平滚动轴")) {
scrollPane.setHorizontalScrollBarPolicy
(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
}
if (e.getActionCommand().equals("适时显示水平滚动轴")) {
scrollPane.setHorizontalScrollBarPolicy
(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
}
scrollPane.revalidate();//重新显示JScrollPane形状。
}
public static void main(String[] args) {
new JScrollPaneDemo();
}
}
)
