/**
* Moves the selected thumb in the specified direction by a unit increment. This method is called
* when the user presses one of the arrow keys.
*/
@Override
public void scrollByUnit(int direction) {
synchronized (slider) {
int delta = 1 * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (upperThumbSelected) {
int oldValue = ((RangeSlider) slider).getUpperValue();
((RangeSlider) slider).setUpperValue(oldValue + delta);
} else {
int oldValue = slider.getValue();
slider.setValue(oldValue + delta);
}
}
}
/**
* Moves the selected thumb in the specified direction by a block increment. This method is called
* when the user presses the Page Up or Down keys.
*/
@Override
public void scrollByBlock(int direction) {
synchronized (slider) {
int blockIncrement = (slider.getMaximum() - slider.getMinimum()) / 10;
if (blockIncrement <= 0 && slider.getMaximum() > slider.getMinimum()) {
blockIncrement = 1;
}
int delta = blockIncrement * ((direction > 0) ? POSITIVE_SCROLL : NEGATIVE_SCROLL);
if (upperThumbSelected) {
int oldValue = ((RangeSlider) slider).getUpperValue();
((RangeSlider) slider).setUpperValue(oldValue + delta);
} else {
int oldValue = slider.getValue();
slider.setValue(oldValue + delta);
}
}
}
public void display() {
// Initialize values.
rangeSlider.setValue(3);
rangeSlider.setUpperValue(7);
// Initialize value display.
rangeSliderValue1.setText(String.valueOf(rangeSlider.getValue()));
rangeSliderValue2.setText(String.valueOf(rangeSlider.getUpperValue()));
// Create window frame.
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setTitle("Range Slider Demo");
// Set window content and validate.
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(this, BorderLayout.CENTER);
frame.pack();
// Set window location and display.
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}