自定义Jtable滚动条

Question

我正在制作一个基于Swing的桌面应用程序。

我想定制jtable中的滚动条。我已经得到了下面的代码来定制滚动条，但我不知道如何将它应用到jtable。

public class MyScrollBarUI extends BasicScrollBarUI { 

    @Override 
    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) { 
     g.setColor(Color.black); 
     g.fillRect(trackBounds.width/2, trackBounds.y, 3, trackBounds.height); 
     if (this.trackHighlight == BasicScrollBarUI.DECREASE_HIGHLIGHT) { 
      this.paintDecreaseHighlight(g); 
     } else if (this.trackHighlight == BasicScrollBarUI.INCREASE_HIGHLIGHT) { 
      this.paintIncreaseHighlight(g); 
     } 
    } 

    @Override 
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) { 
     if (thumbBounds.isEmpty() || !this.scrollbar.isEnabled()) { 
      return; 
     } 
     g.translate(thumbBounds.x, thumbBounds.y); 
     g.setColor(this.thumbDarkShadowColor); 
     g.drawOval(2, 0, 14, 14); 
     g.setColor(this.thumbColor); 
     g.fillOval(2, 0, 14, 14); 
     g.setColor(this.thumbHighlightColor); 
     g.setColor(this.thumbLightShadowColor); 
     g.translate(-thumbBounds.x, -thumbBounds.y); 
    } 
} 

，我也下设置滚动条的外观和在我的程序

UIManager.put("ScrollBarUI", "mypackage.ui.customization.MyScrollBarUI"); 

Answer 1

开始觉得如果你这样做对你的UI的特定滚动条，则只需设置的新实例你的ScrollBarUI直接放在包装你桌子的滚动窗格上。

下面显示你如何做到这一点：

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Rectangle; 

import javax.swing.JComponent; 
import javax.swing.JFrame; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.SwingUtilities; 
import javax.swing.plaf.basic.BasicScrollBarUI; 
import javax.swing.table.DefaultTableModel; 

public class MyScrollBarUI extends BasicScrollBarUI { 

    protected static void initUI() { 
     JFrame frame = new JFrame("Test scrollbar UI"); 
     JTable table = new JTable(new DefaultTableModel(30, 5)); 
     JScrollPane scrollPane = new JScrollPane(table); 
     scrollPane.getVerticalScrollBar().setUI(new MyScrollBarUI()); 
     frame.add(scrollPane); 
     frame.pack(); 
     frame.setSize(frame.getWidth(), frame.getHeight()-50); // Forces the vertical scroll bar to show up 
     frame.setVisible(true); 
    } 

    @Override 
    protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) { 
     g.setColor(Color.black); 
     g.fillRect(trackBounds.width/2, trackBounds.y, 3, trackBounds.height); 
     if (this.trackHighlight == BasicScrollBarUI.DECREASE_HIGHLIGHT) { 
      this.paintDecreaseHighlight(g); 
     } else if (this.trackHighlight == BasicScrollBarUI.INCREASE_HIGHLIGHT) { 
      this.paintIncreaseHighlight(g); 
     } 
    } 

    @Override 
    protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) { 
     if (thumbBounds.isEmpty() || !this.scrollbar.isEnabled()) { 
      return; 
     } 
     g.translate(thumbBounds.x, thumbBounds.y); 
     g.setColor(this.thumbDarkShadowColor); 
     g.drawOval(2, 0, 14, 14); 
     g.setColor(this.thumbColor); 
     g.fillOval(2, 0, 14, 14); 
     g.setColor(this.thumbHighlightColor); 
     g.setColor(this.thumbLightShadowColor); 
     g.translate(-thumbBounds.x, -thumbBounds.y); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       initUI(); 
      }; 
     }); 
    } 

}