在JSlider更改时更新JLabel的奇怪问题

Question

伙计们，我有一个奇怪的问题。我对swing和java应用程序有点陌生。
我正在尝试制作一个自定义UI jslider，当你移动拇指时改变jlabel文本。
我的问题是:当我使用addChangeListener()时，它会在移动拇指时产生奇怪的故障。
如果我不使用它，它工作得很好。
如何在不使用更改侦听器的情况下更新JLabel，或者如何修复这个图形错误?

大部分代码来自stackoverflow，因为我不太了解绘制组件。

查看按钮上的图片以更好地理解问题

谢谢!

jpanel

中的代码

JSlider slider = new JSlider(SwingConstants.HORIZONTAL, 1, 10, 1) {
@Override
public void updateUI() {
setUI(new CustomSliderUI(this));
}
};
// If I comment this line the visual glitch is gone when moving the thumb, but the value doesnt update
slider.addChangeListener((event) -> RAM_LABEL.setText(slider.getValue() + " Gb"));
slider.setMinorTickSpacing(1);
slider.setMajorTickSpacing(10);
slider.setSnapToTicks(true);
slider.setBounds(96, 317, 300, 35);
slider.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
slider.setOpaque(false);
this.add(slider);

自定义滑块ui类

private static class CustomSliderUI extends BasicSliderUI
{
private static final int TRACK_HEIGHT = 8;
private static final int TRACK_ARC = 5;
private static final Dimension THUMB_SIZE = new Dimension(22, 20);
private final RoundRectangle2D.Float trackShape = new RoundRectangle2D.Float();
private final Image knob;
public CustomSliderUI(final JSlider b)
{
super(b);
knob = Swinger.getResource("knob.png");
}
@Override
protected void calculateTrackRect() {
super.calculateTrackRect();
trackRect.y = trackRect.y + (trackRect.height - TRACK_HEIGHT) / 2;
trackRect.height = TRACK_HEIGHT;
trackShape.setRoundRect(trackRect.x, trackRect.y, trackRect.width, trackRect.height, TRACK_ARC, TRACK_ARC);
}
@Override
protected void calculateThumbLocation() {
super.calculateThumbLocation();
thumbRect.y = trackRect.y + (trackRect.height - thumbRect.height) / 2;
}
@Override
protected Dimension getThumbSize() {
return THUMB_SIZE;
}
@Override
public void paint(final Graphics g, final JComponent c) {
((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
super.paint(g, c);
}
@Override
public void paintTrack(final Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Shape clip = g2.getClip();
boolean inverted = slider.getInverted();
// Paint shadow.
g2.setColor(new Color(170, 170 ,170));
g2.fill(trackShape);
// Paint track background.
g2.setColor(new Color(200, 200 ,200));
g2.setClip(trackShape);
trackShape.y += 1;
g2.fill(trackShape);
trackShape.y = trackRect.y;
g2.setClip(clip);
// Paint selected track.
boolean ltr = slider.getComponentOrientation().isLeftToRight();
if (ltr) inverted = !inverted;
int thumbPos = thumbRect.x + thumbRect.width / 2;
if (inverted) {
g2.clipRect(0, 0, thumbPos, slider.getHeight());
} else {
g2.clipRect(thumbPos, 0, slider.getWidth() - thumbPos, slider.getHeight());
}
g2.setColor(Swinger.getTransparentWhite(0));
g2.fill(trackShape);
g2.setClip(clip);
}
@Override
public void paintThumb(final Graphics g)
{
g.drawImage(knob, thumbRect.x, thumbRect.y, null);
}
@Override
public void paintFocus(final Graphics g) {}
}

移动光标时出现视觉故障，一旦停止按鼠标它就会恢复正常

常规光标/当我移动它时，没有更改侦听器

Answer 1

解决。我开始画我自己的背景，这样更简单。

private static class CustomSliderUI extends BasicSliderUI
{
private static final Dimension THUMB_SIZE = new Dimension(22, 20);
private final Image thumb, background;
private final JSlider slider;
public CustomSliderUI(final JSlider b)
{
super(b);
slider = b;
thumb = Swinger.getResource("thumb.png");
background = Swinger.getResource("slider.png");
}
@Override
protected Dimension getThumbSize() {
return THUMB_SIZE;
}
@Override
public void paintTrack(final Graphics g) {
g.drawImage(background, 10, 11, 280, 10, null);
}
@Override
public void paintThumb(final Graphics g)
{
g.drawImage(thumb, thumbRect.x, thumbRect.y, null);
slider.repaint();
}
@Override
public void paintFocus(final Graphics g) {}
}

JSlider slider = new JSlider(SwingConstants.HORIZONTAL, 1, 10, 1) {
@Override
public void updateUI() {
setUI(new CustomSliderUI(this));
}
};
slider.addChangeListener((event) -> RAM_LABEL.setText(slider.getValue() + " Gb"));
slider.setBounds(96, 317, 300, 35);
slider.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
slider.setOpaque(false);
this.add(slider);