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Learning Java : Chapter 14: Using Swing Components

Buy this book Title: Learning Java ISBN: 1565927184 Order No 7184 US Price: $ 34.95 Publication Date: May 2000 Pages: 722 © O'Reilly & Associates, Inc. Author's Top Ten Tips and Tricks

The JSplitPane Class

A split pane is a special container that holds two components, each in its own sub-pane. A splitter bar adjusts the sizes of the two sub-panes. In a document viewer, you could use a split pane to show a table of contents next to a full document.

The following example capitalizes on the ImageComponent class from the previous example. It displays two ImageComponents, wrapped in JScrollPanes, in either side of a JSplitPane. You can drag the splitter bar back and forth to adjust the sizes of the two contained components.

//file: SplitPaneFrame.java
import java.awt.*; 
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

public class SplitPaneFrame {
  public static void main(String[] args) {
    String fileOne = "Piazza di Spagna.jpg";
    String fileTwo = "L1-Light.jpg";
    if (args.length > 0) fileOne = args[0];
    if (args.length > 1) fileTwo = args[1];
    // create a JFrame to hold everything
    JFrame f = new JFrame("SplitPaneFrame");
    f.addWindowListener(new WindowAdapter(  ) {
      public void windowClosing(WindowEvent we) { System.exit(0); }
    });
    f.setSize(300, 200);
    f.setLocation(200, 200);
    Image leftImage = Toolkit.getDefaultToolkit(  ).getImage(fileOne);
    Component left =
      new JScrollPane(new ImageComponent(leftImage));
    Image rightImage = Toolkit.getDefaultToolkit(  ).getImage(fileTwo);
    Component right = 
      new JScrollPane(new ImageComponent(rightImage));
    JSplitPane split = 
      new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, left, right);
    split.setDividerLocation(100);
    f.getContentPane(  ).add(split);

    f.setVisible(true);
  }
}

This example is shown in Figure 14-7.

Figure 14-7. Using a split pane

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