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How to use Adjustment Events in Swing |
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Adjustment Events occur when a JScrollBar component is moved. To handle these events,
a class must implement the AdjustmentListener interface. The adjustmentValueChanged(AdjustmentEvent)
method is the only method in the AdjustmentListener interface.
The following example shows how to use adjustment events in Swing:
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class WellAdjusted extends JFrame implements AdjustmentListener {
JTextField value = new JTextField("50", 30);
JScrollBar bar = new JScrollBar(SwingConstants.HORIZONTAL,
50, 10, 0, 100);
public WellAdjusted() {
super("Well Adjusted");
setSize(350, 100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
bar.addAdjustmentListener(this);
value.setHorizontalAlignment(SwingConstants.CENTER);
value.setEditable(false);
JPanel pane = new JPanel();
pane.setLayout(new BorderLayout());
pane.add(value, "Center");
pane.add(bar, "South");
setContentPane(pane);
}
public static void main(String[] arguments) {
JFrame frame = new WellAdjusted();
frame.show();
}
public void adjustmentValueChanged(AdjustmentEvent evt) {
Object source = evt.getSource();
if (source == bar) {
int newValue = bar.getValue();
value.setText("" + newValue);
}
repaint();
}
}
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