Swing的CardLayout範例

CardLayout類將容器中的每個元件排列為卡片。一次只能看到一張卡片，而容器則充當一疊卡片。

範例

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

public class SwingTester {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   private JLabel msglabel;

   public SwingTester(){
      prepareGUI();
   }
   public static void main(String[] args){
       SwingTester swingLayoutDemo = new SwingTester();  
      swingLayoutDemo.showCardLayoutDemo();       
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java SWING CardLayout範例");
      mainFrame.setSize(560,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      headerLabel = new JLabel("",JLabel.CENTER );
      statusLabel = new JLabel("",JLabel.CENTER);        
      statusLabel.setSize(350,100);

      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }        
      });    
      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }
   private void showCardLayoutDemo(){
      headerLabel.setText("Layout in action: CardLayout");      

      final JPanel panel = new JPanel();
      panel.setBackground(Color.pink);
      panel.setSize(300,300);

      CardLayout layout = new CardLayout();
      layout.setHgap(10);
      layout.setVgap(10);
      panel.setLayout(layout);        

      JPanel buttonPanel = new JPanel(new FlowLayout());
      buttonPanel.add(new JButton("確定"));
      buttonPanel.add(new JButton("取消"));    

      JPanel textBoxPanel = new JPanel(new FlowLayout());
      textBoxPanel.add(new JLabel("名稱:"));
      textBoxPanel.add(new JTextField(20));

      panel.add("Button", buttonPanel);
      panel.add("Text", textBoxPanel);
      final DefaultComboBoxModel panelName = new DefaultComboBoxModel();

      panelName.addElement("Button");
      panelName.addElement("Text");
      final JComboBox listCombo = new JComboBox(panelName);    

      listCombo.setSelectedIndex(0);
      JScrollPane listComboScrollPane = new JScrollPane(listCombo);    
      JButton showButton = new JButton("顯示");

      showButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) { 
            String data = "";
            if (listCombo.getSelectedIndex() != -1) {  
               CardLayout cardLayout = (CardLayout)(panel.getLayout());
               cardLayout.show(panel, 
                  (String)listCombo.getItemAt(listCombo.getSelectedIndex()));            
            }              
            statusLabel.setText(data);
         }
      }); 
      controlPanel.add(listComboScrollPane);
      controlPanel.add(showButton);
      controlPanel.add(panel);
      mainFrame.setVisible(true);  
   }
}

執行上面範例程式碼，得到以下結果：