我一直在寻找一种方法来添加垂直滚动条JPanel
依次添加到CardLayout
控制板。我查找了这里所有与实现可滚动相关的帖子JPanel
但我不知道如何用这个特定的方法来实现它CardLayout
。 Oracle 也没有给出我可以使用的示例。
也许我没有使用正确的配置JWindow
或我使用的任何其他组件。
我在下面放置了我的程序的精简版本,我想为其实现垂直滚动条。
我的问题是如何实施JPanelScrollable
类位于代码底部,以便它可以滚动?
import javax.swing.*;
import java.awt.*;
import java.net.URL ;
public class Program2 extends JFrame
{
public Program2()
{
super("Flash CC");
Container2 container = new Container2();
setSize(700, 800);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setFocusable( true ) ;
add(container);
setVisible(true) ;
}
public static void main(String[] args)
{
Program2 prog = new Program2();
}
}
class Container2 extends JPanel
{
private CardLayout cardLayout = new CardLayout() ;
private JPanel1 jPanelFirst = new JPanel1() ;
private JPanel2 jPanelSecond = new JPanel2() ;
private JPanelScrollable jPanelThird = new JPanelScrollable() ;
//Constructor
Container2()
{
this.setLayout( cardLayout ) ;
this.setFocusable( true ) ;
JScrollPane scrollFrame = new JScrollPane(jPanelThird);
this.add( jPanelFirst, "first card" ) ;
this.add( jPanelSecond, "second card" ) ;
this.add( scrollFrame , "third card" ) ;
cardLayout.show( this, "third card" ) ;
}
}
class JPanel1 extends JPanel
{
}
class JPanel2 extends JPanel
{
}
class JPanelScrollable extends JPanel
{
// here many, many, many elemnts will go
// and a vertical scroll barr is needed to view'm all.
JPanelScrollable()
{
this.setOpaque( true ) ;
this.setLayout( null ) ;
for(int i=0; i<30; i++)
{
JButton b = new JButton("Button" + i) ;
b.setBounds(0, (i * 100), 100, 50) ;
this.add(b) ;
}
}
}
将面板添加到 JScrollPane
JScrollPane scrollPane = new JScrollPane(jPanelThird);
将滚动窗格添加到 CardLayout
this.add(scrollPane, "third card");
See 如何使用滚动窗格 http://docs.oracle.com/javase/tutorial/uiswing/components/scrollpane.html更多细节
更新了工作示例
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestCardLayout {
public static void main(String[] args) {
new TestCardLayout();
}
private int index = 0;
public TestCardLayout() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
final CardLayout cl = new CardLayout();
final JPanel cardPane = new JPanel(cl);
cardPane.add(new JLabel("Hello"), "1");
cardPane.add(new JScrollPane(createForm()), "2");
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(cardPane);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
JButton next = new JButton("Next");
next.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
index++;
if (index > 1) {
index = 0;
}
if (index == 0) {
cl.show(cardPane, "1");
} else {
cl.show(cardPane, "2");
}
}
});
frame.add(next, BorderLayout.SOUTH);
}
});
}
public JPanel createForm() {
JPanel form = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
for (int index = 0; index < 100; index++) {
form.add(new JTextField(10), gbc);
}
return form;
}
}
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