tabbedpanedemo.java

java程序设计

/* 
 * TabbedPaneDemo.java is a 1.4 example that requires one additional file:
 *   images/middle.gif. 
 */

import javax.swing.JTabbedPane;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JComponent;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;

public class TabbedPaneDemo extends JPanel {
    public TabbedPaneDemo() {
        super(new GridLayout(1, 1));

        JTabbedPane tabbedPane = new JTabbedPane();
        ImageIcon icon = createImageIcon("images/middle.gif");

        JComponent panel1 = makeTextPanel("Panel #1");
        tabbedPane.addTab("Tab 1", icon, panel1,
                          "Does nothing");
        tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);

        JComponent panel2 = makeTextPanel("Panel #2");
        tabbedPane.addTab("Tab 2", icon, panel2,
                          "Does twice as much nothing");
        tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);

        JComponent panel3 = makeTextPanel("Panel #3");
        tabbedPane.addTab("Tab 3", icon, panel3,
                          "Still does nothing");
        tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);

        JComponent panel4 = makeTextPanel(
                "Panel #4 (has a preferred size of 410 x 50).");
	panel4.setPreferredSize(new Dimension(410, 50));
        tabbedPane.addTab("Tab 4", icon, panel4,
                          "Does nothing at all");
        tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);

        //Add the tabbed pane to this panel.
        add(tabbedPane);
        
        //Uncomment the following line to use scrolling tabs.
        //tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
    }

    protected JComponent makeTextPanel(String text) {
        JPanel panel = new JPanel(false);
        JLabel filler = new JLabel(text);
        filler.setHorizontalAlignment(JLabel.CENTER);
        panel.setLayout(new GridLayout(1, 1));
        panel.add(filler);
        return panel;
    }

    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path) {
        java.net.URL imgURL = TabbedPaneDemo.class.getResource(path);
        if (imgURL != null) {
            return new ImageIcon(imgURL);
        } else {
            System.err.println("Couldn't find file: " + path);
            return null;
        }
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("TabbedPaneDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        JComponent newContentPane = new TabbedPaneDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.getContentPane().add(new TabbedPaneDemo(),
                                 BorderLayout.CENTER);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}