在对话框中,如果选中某个组合,则需要显示一组控件,否则显示另一组控件.
即我需要2层,我需要在选中/取消选中组合时在它们之间切换.我怎样才能做到这一点?
即我需要2层,我需要在选中/取消选中组合时在它们之间切换.我怎样才能做到这一点?
谢谢
解决方法
CardLayout
适用于此,如下所示.
import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Random; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; /** @see https://stackoverflow.com/questions/6432170 */ public class CardPanel extends JPanel { private static final Random random = new Random(); private static final JPanel cards = new JPanel(new CardLayout()); private static final JComboBox combo = new JComboBox(); private final String name; public CardPanel(String name) { this.name = name; this.setPreferredSize(new Dimension(320,240)); this.setBackground(new Color(random.nextInt())); this.add(new JLabel(name)); } @Override public String toString() { return name; } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { create(); } }); } private static void create() { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); for (int i = 1; i < 9; i++) { CardPanel p = new CardPanel("Panel " + String.valueOf(i)); combo.addItem(p); cards.add(p,p.toString()); } JPanel control = new JPanel(); combo.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { JComboBox jcb = (JComboBox) e.getSource(); CardLayout cl = (CardLayout) cards.getLayout(); cl.show(cards,jcb.getSelectedItem().toString()); } }); control.add(combo); f.add(cards,BorderLayout.CENTER); f.add(control,BorderLayout.SOUTH); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } }
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。