Java Reference
In-Depth Information
Listing 12-2. JScrollBar Usage Sample
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class ScrollBarSample {
public static void main(String args[]) {
Runnable runner = new Runnable() {
public void run() {
AdjustmentListener adjustmentListener = new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent adjustmentEvent) {
System.out.println("Adjusted: " + adjustmentEvent.getValue());
}
};
JScrollBar oneJScrollBar = new JScrollBar(JScrollBar.HORIZONTAL);
oneJScrollBar.addAdjustmentListener(adjustmentListener);
ChangeListener changeListener = new BoundedChangeListener();
JScrollBar anotherJScrollBar = new JScrollBar(JScrollBar.HORIZONTAL);
BoundedRangeModel model = anotherJScrollBar.getModel();
model.addChangeListener(changeListener);
JFrame frame = new JFrame("ScrollBars R Us");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(oneJScrollBar, BorderLayout.NORTH);
frame.add(anotherJScrollBar, BorderLayout.SOUTH);
frame.setSize(300, 200);
frame.setVisible(true);
}
};
EventQueue.invokeLater(runner);
}
}
When you run this program, it shows the two horizontal scrollbars seen in Figure 12-3.
The output of moving the scrollbars is sent to the console window.
Figure 12-3. Dual JScrollBar listening
 
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