Learning Java

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); ...