/**
* 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);
}
}
}
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);
}
/**
* 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 RangeSliderDemo() {
setBorder(BorderFactory.createEmptyBorder(6, 6, 6, 6));
setLayout(new GridBagLayout());
rangeSliderLabel1.setText("Lower value:");
rangeSliderLabel2.setText("Upper value:");
rangeSliderValue1.setHorizontalAlignment(JLabel.LEFT);
rangeSliderValue2.setHorizontalAlignment(JLabel.LEFT);
rangeSlider.setPreferredSize(new Dimension(240, rangeSlider.getPreferredSize().height));
rangeSlider.setMinimum(0);
rangeSlider.setMaximum(10);
// Add listener to update display.
rangeSlider.addChangeListener(
new ChangeListener() {
public void stateChanged(ChangeEvent e) {
RangeSlider slider = (RangeSlider) e.getSource();
rangeSliderValue1.setText(String.valueOf(slider.getValue()));
rangeSliderValue2.setText(String.valueOf(slider.getUpperValue()));
}
});
add(
rangeSliderLabel1,
new GridBagConstraints(
0,
0,
1,
1,
0.0,
0.0,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
new Insets(0, 0, 3, 3),
0,
0));
add(
rangeSliderValue1,
new GridBagConstraints(
1,
0,
1,
1,
0.0,
0.0,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
new Insets(0, 0, 3, 0),
0,
0));
add(
rangeSliderLabel2,
new GridBagConstraints(
0,
1,
1,
1,
0.0,
0.0,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
new Insets(0, 0, 3, 3),
0,
0));
add(
rangeSliderValue2,
new GridBagConstraints(
1,
1,
1,
1,
0.0,
0.0,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
new Insets(0, 0, 6, 0),
0,
0));
add(
rangeSlider,
new GridBagConstraints(
0,
2,
2,
1,
0.0,
0.0,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
new Insets(0, 0, 0, 0),
0,
0));
}
