在使用某些"外观和感觉时,是否有一种简单的方法可以更改JSlider上方标签中显示的值?
要说清楚,我正在谈论这个价值:
具体来说,我想将值除以1000而不是值本身。
我知道如果我显示它,我可以设置刻度标签,但是用户必须猜测实际值。
我也知道我可以使用this answer删除标签,然后实现我自己用滑块更新的标签,但这正是我想要避免的。
考虑到JSlider不支持双打,这似乎是一个明显的问题。
答案 0 :(得分:2)
具体来说,我想将值除以1000而不是值本身。
这可能有效:label.setText(String.format("%.3f", slider.getValue() / 1000f));
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public final class SliderTooltipTest {
private JComponent makeUI() {
JSlider slider = new JSlider(1, 100000) {
private SliderPopupListener popupHandler;
@Override public void updateUI() {
removeMouseMotionListener(popupHandler);
removeMouseListener(popupHandler);
removeMouseWheelListener(popupHandler);
super.updateUI();
popupHandler = new SliderPopupListener();
addMouseMotionListener(popupHandler);
addMouseListener(popupHandler);
addMouseWheelListener(popupHandler);
}
};
slider.setMajorTickSpacing(10000);
slider.setPaintTicks(true);
JPanel p = new JPanel();
p.setBorder(BorderFactory.createEmptyBorder(50, 10, 50, 10));
p.add(new JLabel("1"));
p.add(slider);
p.add(new JLabel("100Gb/s"));
return p;
}
public static void main(String... args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
try {
for (UIManager.LookAndFeelInfo laf: UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(laf.getName())) {
UIManager.setLookAndFeel(laf.getClassName());
}
}
} catch (Exception e) {
e.printStackTrace();
}
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new SliderTooltipTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class SliderPopupListener extends MouseAdapter {
private final JWindow toolTip = new JWindow();
private final JLabel label = new JLabel("", SwingConstants.CENTER);
private final Dimension size = new Dimension(60, 20);
private int prevValue = -1;
public SliderPopupListener() {
super();
label.setOpaque(false);
label.setBackground(UIManager.getColor("ToolTip.background"));
//label.setBorder(UIManager.getBorder("ToolTip.border"));
label.setBorder(BorderFactory.createLineBorder(Color.CYAN.darker()));
toolTip.add(label);
toolTip.setSize(size);
}
protected void updateToolTip(MouseEvent me) {
JSlider slider = (JSlider) me.getComponent();
int intValue = (int) slider.getValue();
if (prevValue != intValue) {
label.setText(String.format("%.3f", slider.getValue() / 1000f));
Point pt = me.getPoint();
pt.y = -size.height;
SwingUtilities.convertPointToScreen(pt, me.getComponent());
pt.translate(-size.width / 2, 0);
toolTip.setLocation(pt);
}
prevValue = intValue;
}
@Override public void mouseDragged(MouseEvent me) {
toolTip.setVisible(true);
updateToolTip(me);
}
@Override public void mouseReleased(MouseEvent me) {
toolTip.setVisible(false);
}
}