java - 如何去除jSlider的边框

Question

我定制了一个jSlider，遇到了一个小问题-

更改值后，我的自定义 jSlider 上显示了一个边框。抱歉，我已经拍了照片，但不允许我发布。未定制的jSlider点击后不会显示这样的边框。

是否有一个我必须重写的方法来摆脱这个边框？预先感谢您!

对不起我的英语!希望任何人都可以帮助我!这是我的定制用户界面:

    public class RedGreenSliderUI extends BasicSliderUI{
    Image knobImage ;
    private BasicStroke stroke = new BasicStroke(1f, BasicStroke.CAP_ROUND, 
            BasicStroke.JOIN_ROUND, 0f, new float[]{1f, 2f}, 0f);
    private static final float[] fractions = {0.0f, 0.5f};   
  private static final Color[] fillColors = {   
   /* new Color(0x2687AE),*/ 
   /* new Color(0x1658AE)*/ 
      new Color(0xc8041b),
      new Color(0xc8041b)
  };   
  private static final Color[] backColors = {   
    new Color(0x04c814),   
    new Color(0x04c814)   
  };   

    private static final Paint hFillGradient = new LinearGradientPaint(0, 0, 0, 11,   
          fractions, fillColors, MultipleGradientPaint.CycleMethod.NO_CYCLE);   
  private static final Paint hBackGradient = new LinearGradientPaint(0, 0, 0, 11,   
          fractions, backColors, MultipleGradientPaint.CycleMethod.NO_CYCLE);   
  private static final Paint vFillGradient = new LinearGradientPaint(0, 0, 11, 0,   
          fractions, fillColors, MultipleGradientPaint.CycleMethod.NO_CYCLE);   
  private static final Paint vBackGradient = new LinearGradientPaint(0, 0, 11, 0,   
          fractions, backColors, MultipleGradientPaint.CycleMethod.NO_CYCLE);   
  private static final Stroke roundEndStroke = new BasicStroke(5,   
          BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND);   

        public RedGreenSliderUI( JSlider aSlider ) {

            super( aSlider );

            try {

                this.knobImage = ImageIO.read(getClass().getResource("ringelblumensalbe-             Updater-Grafiken/tongThumb01.png")); //.getClassLoader()


            } catch ( IOException e ) {

                e.printStackTrace();
            }
        }
        public void paintThumb(Graphics g)  {        

            g.drawImage( this.knobImage, thumbRect.x, thumbRect.y, 15, 30, null );

        }
         @Override
    protected Dimension getThumbSize() {
        return new Dimension(15, 30);
    }

         @Override
    protected Color getHighlightColor() {
             return new Color(98, 94, 0);
         }

          public void paintTrack(Graphics g) {   
    Graphics2D g2 = (Graphics2D) g;   
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,           RenderingHints.VALUE_ANTIALIAS_ON);   

    if (slider.getOrientation() == JSlider.HORIZONTAL) {   
      int cy = (trackRect.height / 2) - 2;   
      g.translate(trackRect.x, trackRect.y + cy);   

      g2.setStroke(roundEndStroke);   
      g2.setPaint(hBackGradient);   
      g2.drawLine(thumbRect.x, 2, trackRect.width, 2);   
      g2.setPaint(hFillGradient);   
      g2.drawLine(0, 2, thumbRect.x, 2);   

      g.translate(-trackRect.x, -(trackRect.y + cy));   
    } else {   
      int cx = (trackRect.width / 2) - 2;   
      g.translate(trackRect.x + cx, trackRect.y);   

      g2.setStroke(roundEndStroke);   
      g2.setPaint(vBackGradient);   
      g2.drawLine(2, 0, 2, thumbRect.y);   
      g2.setPaint(vFillGradient);   
      g2.drawLine(2, thumbRect.y, 2, trackRect.height);   

      g.translate(-(trackRect.x + cx), -trackRect.y);   
    }   
  }  

编辑:我明白了。答案是重写 getFocusColor()。

@Override
     protected Color getFocusColor(){
         return new Color(255,255,255);
     }

Answer 1

焦点矩形由 slider 的 UI 委托(delegate)渲染，通常基于 BasicSliderUI。虽然我不提倡取消焦点指示器，但您可以尝试以下方法之一:

• 使用UIManager设置“Slider.focus”颜色以匹配“Slider.background”。

• 重写paintFocus()方法以不执行任何操作；相关示例可见here .