import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.beans.*; /* * SplitPaneDividerDemo.java is a 1.4 application that requires the following files: * SizeDisplayer.java * images/Cat.gif * images/Dog.gif */ public class SplitPaneDividerDemo extends JPanel implements ActionListener { private JSplitPane splitPane; public SplitPaneDividerDemo() { super(new BorderLayout()); Font font = new Font("Serif", Font.ITALIC, 24); ImageIcon icon = createImageIcon("images/Cat.gif"); SizeDisplayer sd1 = new SizeDisplayer("left", icon); sd1.setMinimumSize(new Dimension(30,30)); sd1.setFont(font); icon = createImageIcon("images/Dog.gif"); SizeDisplayer sd2 = new SizeDisplayer("right", icon); sd2.setMinimumSize(new Dimension(60,60)); sd2.setFont(font); splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, sd1, sd2); splitPane.setResizeWeight(0.5); splitPane.setOneTouchExpandable(true); splitPane.setContinuousLayout(true); add(splitPane, BorderLayout.CENTER); add(createControlPanel(), BorderLayout.PAGE_END); } private JComponent createControlPanel() { JPanel panel = new JPanel(); JButton reset = new JButton("Reset"); reset.addActionListener(this); panel.add(reset); return panel; } //Required by ActionListener interface. Respond to reset button. public void actionPerformed(ActionEvent e) { splitPane.resetToPreferredSizes(); } /** Returns an ImageIcon, or null if the path was invalid. */ private static ImageIcon createImageIcon(String path) { java.net.URL imgURL = SplitPaneDividerDemo.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("SplitPaneDividerDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. SplitPaneDividerDemo newContentPane = new SplitPaneDividerDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //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(); } }); } }