JScrollpane中的自定义滚动条// Java Swing

我制作了自己的ScrollbarUI，并且它与JScrollbar完美协作。问题是我必须连接这个滚动条和一个JPanel来滚动它。我已经尝试过使用JScrollPane，但是当我尝试接近垂直滚动条时，它只是不会回应。我试图改变一些简单的东西，如光标，宽度，高度，背景来测试如果用户界面是问题，但也没有工作。JScrollpane中的自定义滚动条// Java Swing

JPanel panel_1 = new JPanel(); 
    JScrollPane scrollpane = new JScrollPane(panel_1); 
    scrollpane.setBorder(null); 
    scrollpane.getVerticalScrollBar().setUI(new MyScrollbarUI()); 

    JTextArea txtrLorem = new JTextArea(); 
    txtrLorem.setPreferredSize(new Dimension(400, 1500)); 
    txtrLorem.setMaximumSize(new Dimension(400, 2147483647)); 
    txtrLorem.setText("Lorem ipsum..."); 
    panel_1.add(txtrLorem); 

    scrollpane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); 
    scrollpane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); 
    GridBagConstraints gbc_panel_1 = new GridBagConstraints(); 
    gbc_panel_1.gridwidth = 5; 
    gbc_panel_1.insets = new Insets(0, 0, 0, 5); 
    gbc_panel_1.fill = GridBagConstraints.BOTH; 
    gbc_panel_1.gridx = 1; 
    gbc_panel_1.gridy = 4; 
    add(scrollpane, gbc_panel_1); 

    JScrollBar scrollBar = new JScrollBar(); 
    scrollBar.setPreferredSize(new Dimension(20, 96)); 
    scrollBar.setMinimumSize(new Dimension(20, 5)); 
    scrollBar.setMaximumSize(new Dimension(20, 32767)); 
    scrollBar.setUI(new MyScrollbarUI()); 
    GridBagConstraints gbc_scrollBar = new GridBagConstraints(); 
    gbc_scrollBar.fill = GridBagConstraints.VERTICAL; 
    gbc_scrollBar.insets = new Insets(0, 0, 0, 5); 
    gbc_scrollBar.gridx = 6; 
    gbc_scrollBar.gridy = 4; 
    add(scrollBar, gbc_scrollBar);

JScrollBar有正确的设计，但JScrollPane的滚动条没有。这里是UI：

公共类MyScrollbarUI扩展BasicScrollBarUI {

@Override 
    protected JButton createDecreaseButton(int orientation) { 
     JButton btnL = new JButton(""); 
     btnL.setPressedIcon(new ImageIcon(KFO_baender_bracketsetz_einzel.class.getResource("/gui/icons/top_active.png"))); 
     btnL.setBorderPainted(false); 
     btnL.setIcon(new ImageIcon(KFO_baender_bracketsetz_einzel.class.getResource("/gui/icons/top_on.png"))); 
     btnL.setRolloverIcon(new ImageIcon(KFO_baender_bracketsetz_einzel.class.getResource("/gui/icons/top.png"))); 
     btnL.setRolloverEnabled(true); 
     return btnL; 
    } 

    @Override 
    protected JButton createIncreaseButton(int orientation) { 
     JButton btnL = new JButton(""); 
     btnL.setPressedIcon(new ImageIcon(KFO_baender_bracketsetz_einzel.class.getResource("/gui/icons/down_active.png"))); 
     btnL.setBorderPainted(false); 
     btnL.setIcon(new ImageIcon(KFO_baender_bracketsetz_einzel.class.getResource("/gui/icons/down_on.png"))); 
     btnL.setRolloverIcon(new ImageIcon(KFO_baender_bracketsetz_einzel.class.getResource("/gui/icons/down.png"))); 
     btnL.setRolloverEnabled(true); 
     return btnL; 
    } 

    @Override 
    protected void paintDecreaseHighlight(Graphics g) 
    { 
    Insets insets = scrollbar.getInsets(); 
    Rectangle thumbR = getThumbBounds(); 
    g.setColor(new Color(137,144,144)); 

    if (scrollbar.getOrientation() == JScrollBar.VERTICAL) { 
     int x = insets.left+decrButton.getWidth()/2-2; 
     int y = decrButton.getY() + decrButton.getHeight(); 
     int w = 4; 
     int h = thumbR.y - y; 
     g.fillRect(x, y, w, h); 
    } 
    else { 
     int x, w; 
     if (scrollbar.getComponentOrientation().isLeftToRight()) { 
     x = decrButton.getX() + decrButton.getWidth(); 
     w = thumbR.x - x; 
     } else { 
     x = thumbR.x + thumbR.width; 
     w = decrButton.getX() - x; 
     } 
     int y = insets.top; 
     int h = scrollbar.getHeight() - (insets.top + insets.bottom); 
     g.fillRect(x, y, w, h); 
    } 
    } 

    @Override 
    protected void paintIncreaseHighlight(Graphics g) { 
      Insets insets = scrollbar.getInsets(); 
      Rectangle thumbR = getThumbBounds(); 
      g.setColor(new Color(202,207,203)); 

      if (scrollbar.getOrientation() == JScrollBar.VERTICAL) { 
       int x = insets.left+decrButton.getWidth()/2-2; 
       int y = thumbR.y; 
       int w = 4; 
       int h = incrButton.getY() - y; 
       g.fillRect(x, y, w, h); 
      } 
     } 


    @Override 
    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) 
    { 
     g.setColor(Color.WHITE); 
     g.fillRect(trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height); 
     paintDecreaseHighlight(g); 
     paintIncreaseHighlight(g); 

    } 

    @Override 
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) 
    { 
     if(thumbBounds.isEmpty() || !scrollbar.isEnabled())  { 
      return; 
     } 

     int w = 16; 
     int h = 16; 

     Graphics2D g2 = (Graphics2D) g; 
     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
      RenderingHints.VALUE_ANTIALIAS_ON); 

     g.translate(thumbBounds.x, thumbBounds.y); 

     GradientPaint gr = new GradientPaint(2, 0, new Color(158,161,162), 18, 16, new Color(96,99,98)); 
     g2.setPaint(gr); 
     g2.fill(new Ellipse2D.Double(2, 0, w-1, h-1)); 

     g2.setPaint(new Color(203,207,203)); 
     g2.fill(new Ellipse2D.Double(6, 4, 7, 7)); 

     g.translate(-thumbBounds.x, -thumbBounds.y); 
    } 





}

来源

2014-01-08 user3172673

你应该张贴的[SSCCE]（HTTP ：//sscce.org）以获得更快速的帮助 –

我尝试了您所描述的内容，并且它没有问题，所以您的问题在于在你没有发布的代码中。顺便说一下，我不明白你为什么需要实现一个用户界面。您可以通过调用自定义UI将调用的非常相同的方法来改变JScrollBar的属性和行为，就像使用其他组件一样，不需要实现UI。 – Holger

我添加了UI的代码，因为有可能在那里找到问题。 – user3172673

试试这个：

JScrollPane table = new JScrollPane(content){ @SuppressWarnings("static-access") @Override public JScrollBar createVerticalScrollBar() { return (new Scroler()).makeUI(); } };

为我工作

来源

2014-05-12 10:23:11 Dogiuks

JScrollpane中的自定义滚动条// Java Swing

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