如何在Java swing中实现TabbedPane的四面阴影效果？

我打算为Tabbedpane获得四面阴影效果。如何在Java swing中实现TabbedPane的四面阴影效果？

我的代码如下这样，

MianClass

import java.awt.FlowLayout; 

import javax.swing.JButton; 
import javax.swing.JCheckBox; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTabbedPane; 
import javax.swing.UIManager; 

class NimbusBaseDemo extends JFrame { 
    /** 
    * 
    */ 
    private static final long serialVersionUID = 1L; 
    JTabbedPane tabbedPane; 
    int i; 

    private UIManager.LookAndFeelInfo[] lafs; 

    public NimbusBaseDemo() { 
     try { 

      // Set nimbus look and feel. nimbusBase works only for it. 
      new NimbusBaseUI(); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

     setTitle("Nimbus Base Demo"); 
     setSize(400, 400); 
     setLayout(new FlowLayout()); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setVisible(true); 
     tabbedPane = new JTabbedPane(); 
     tabbedPane.addTab("World Cities", new CitiesPanel()); 
     tabbedPane.addTab("Colors ", new ColorsPanel()); 
     tabbedPane.addTab("World Cities", new CitiesPanel()); 

     add(tabbedPane); 
    } 

    public static void main(String args[]) { 

     new NimbusBaseDemo(); 
    } 

    class CitiesPanel extends JPanel { 

     public CitiesPanel() { 
      JButton b1 = new JButton("New York"); 
      add(b1); 
      JButton b2 = new JButton("London"); 
      add(b2); 
      JButton b3 = new JButton("Hong Kong"); 
      add(b3); 
      JButton b4 = new JButton("Tokyo"); 
      add(b4); 
     } 
    } 

    class ColorsPanel extends JPanel { 

     public ColorsPanel() { 

      JCheckBox cb1 = new JCheckBox("Red"); 
      cb1.setEnabled(true); 
      add(cb1); 

      JCheckBox cb2 = new JCheckBox("Green"); 
      cb2.setEnabled(true); 
      add(cb2); 
      JCheckBox cb3 = new JCheckBox("Blue"); 
      add(cb3); 
     } 
    } 
}

我伸出NimbusLookAndFeel类以获取标签面板默认主题的车程。通过这个所有我的标签窗格在我的项目中遵循相同的主题。

NimbusBaseUI类

import javax.swing.UIManager; 
import javax.swing.plaf.nimbus.NimbusLookAndFeel; 

public class NimbusBaseUI extends NimbusLookAndFeel { 

    public NimbusBaseUI() { 
     super(); // Initialisation and installating 
     try { 
      new TabbedPaneTheme(this); 
      UIManager.setLookAndFeel(this); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void initialize() { 
     // TODO Auto-generated method stub 
     super.initialize(); 
    } 

}

最后我写的是定制的主题类应用的TabbedPane。在这里我把tabbedpane属性参数设置为NimbusLookAndFeel的getdefaults（）方法。

TabbedPaneTheme类

import java.awt.BasicStroke; 
import java.awt.Color; 
import java.awt.Dimension; 
import java.awt.Font; 
import java.awt.GradientPaint; 
import java.awt.Graphics2D; 
import java.awt.Insets; 
import java.awt.RenderingHints; 

import javax.swing.Painter; 
import javax.swing.plaf.ColorUIResource; 

public class TabbedPaneTheme { 
    private Color light, dark; 
    private GradientPaint gradPaint; 

    protected int strokeSize = 1; 
    /** Color of shadow */ 
    /** Color of shadow */ 
    protected Color shadowColor = new Color(128, 128, 128, 140); 
    // protected Color shadowColor = new Color(0,0,0); 
    /** Sets if it drops shadow */ 
    protected boolean shady = true; 
    /** Sets if it has an High Quality view */ 
    protected boolean highQuality = false; 
    /** Double values for Horizontal and Vertical radius of corner arcs */ 
    protected Dimension arcs = new Dimension(10, 10); 
    /** Distance between shadow border and opaque panel border */ 
    protected int shadowGap = 1; 
    /** The offset of shadow. */ 
    protected int shadowOffset = 1; // width of the shadow 
    /** The transparency value of shadow. (0 - 255) */ 
    protected int shadowAlpha = 130; 

    public TabbedPaneTheme(NimbusBaseUI nimbusUI) { 
     // TODO Auto-generated constructor stub 

     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+Selected].shadow", 
       ColorUIResource.BLUE); 
     nimbusUI.getDefaults().put("TabbedPane:TabbedPaneTab.contentMargins", 
       new Insets(0, 6, 10, 6)); // (// top, left, bottom, right) 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTabArea.contentMargins", 
       new Insets(0, 0, -6, 0)); 
     nimbusUI.getDefaults().put("TabbedPane.tabAreaInsets", 
       new Insets(2, -1, -1, -5)); 
     nimbusUI.getDefaults().put("TabbedPane.contentBorderInsets", 
       new Insets(-1, -1, -1, -5)); 
     nimbusUI.getDefaults().put("TabbedPane.tabsOverlapBorder", 
       new Insets(-5, -5, -5, -5)); 

     nimbusUI.getDefaults().put("Panel.opaque", false); 
     nimbusUI.getDefaults().put("TabbedPane.shadow", new Color(255, 0, 0)); 
     nimbusUI.getDefaults().put("TabbedPane.focus", new Color(255, 0, 0)); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+Selected].backgroundPainter", 
       new TabbedPanePainter(new Color(255, 255, 255), new Color(255, 
         255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+Selected].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+Selected].textForeground", 
       new Color(91, 113, 132)); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Selected].backgroundPainter", 
       new TabbedPanePainter(new Color(255, 255, 255), new Color(255, 
         255, 255))); 
     nimbusUI.getDefaults().put("TabbedPane:TabbedPaneTab[Selected].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Selected].textForeground", 
       new Color(91, 113, 132)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+Pressed].backgroundPainter", 
         new TabbedPanePainter(new Color(255, 255, 255), 
           new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+Selected+Pressed].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+Pressed].textForeground", 
         new Color(91, 113, 132)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Default+Enabled+Selected+Pressed+Focused].backgroundPainter", 
         new TabbedPanePainter(new Color(255, 255, 255), 
           new Color(255, 255, 255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Default+Enabled+Selected+Pressed+Focused].font", 
         new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Default+Enabled+Selected+Pressed+Focused].textForeground", 
         new Color(91, 113, 132)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+MouseOver].backgroundPainter", 
         new TabbedPanePainter(new Color(255, 255, 255), 
           new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+Selected+MouseOver].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+MouseOver].textForeground", 
         new Color(91, 113, 132)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Focused+Selected+MouseOver].backgroundPainter", 
         new TabbedPanePainter(new Color(255, 255, 255), 
           new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Focused+Selected+MouseOver].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Focused+Selected+MouseOver].textForeground", 
         new Color(91, 113, 132)); 

     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Focused+Selected].backgroundPainter", 
       new TabbedPanePainter(new Color(255, 255, 255), new Color(255, 
         255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Focused+Selected].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Focused+Selected].textForeground", 
       new Color(91, 113, 132)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+MouseOver+Pressed+Focused].backgroundPainter", 
         new TabbedPanePainter(new Color(255, 255, 255), 
           new Color(255, 255, 255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+MouseOver+Pressed+Focused].font", 
         new Font("Myriad Pro", Font.BOLD, 12)); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+Selected+MouseOver+Pressed+Focused].textForeground", 
         new Color(91, 113, 132)); 

     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled].backgroundPainter", 
       new TabbedPanePainter(new Color(98, 97, 93), new Color(127, 
         127, 119))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled].textForeground", 
       new Color(255, 255, 255)); 
     nimbusUI.getDefaults().put("TabbedPane:TabbedPaneTab[Enabled].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTab[Enabled+MouseOver].backgroundPainter", 
         new TabbedPanePainter(new Color(255, 255, 255), 
           new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+MouseOver].textForeground", 
       new Color(91, 113, 132)); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTab[Enabled+MouseOver].font", 
       new Font("Myriad Pro", Font.BOLD, 12)); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTabArea[Enabled+MouseOver].backgroundPainter", 
         new TabbedPane_TabView_Painter(
           new Color(255, 255, 255), new Color(255, 255, 
             255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneTabArea[Enabled].backgroundPainter", 
       new TabbedPane_TabView_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTabArea[Focused+Selected].backgroundPainter", 
         new TabbedPane_TabView_Painter(
           new Color(255, 255, 255), new Color(255, 255, 
             255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneTabArea[Focused+Selected+MouseOver].backgroundPainter", 
         new TabbedPane_TabView_Painter(
           new Color(255, 255, 255), new Color(255, 255, 
             255))); 

     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.[Enabled].backgroundPainter", 
       new TabbedPane_TabContent_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.[Selected].backgroundPainter", 
       new TabbedPane_TabContent_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.[Focused].backgroundPainter", 
       new TabbedPane_TabContent_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.[Default].backgroundPainter", 
       new TabbedPane_TabContent_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.backgroundPainter", 
       new TabbedPane_TabContent_Painter(Color.WHITE, Color.WHITE)); 
     nimbusUI.getDefaults().put("TabbedPane:TabbedPaneContent.background", 
       Color.WHITE); 

     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneContent.[Enabled+MouseOver].backgroundPainter", 
         new TabbedPane_TabContent_Painter(new Color(255, 255, 
           255), new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.[Selected].backgroundPainter", 
       new TabbedPane_TabContent_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneContent.[Enabled+Selected].backgroundPainter", 
         new TabbedPane_TabContent_Painter(new Color(255, 255, 
           255), new Color(255, 255, 255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneContent.[Enabled+Focused].backgroundPainter", 
         new TabbedPane_TabContent_Painter(new Color(255, 255, 
           255), new Color(255, 255, 255))); 
     nimbusUI.getDefaults().put(
       "TabbedPane:TabbedPaneContent.[Selected].backgroundPainter", 
       new TabbedPane_TabContent_Painter(new Color(255, 255, 255), 
         new Color(255, 255, 255))); 
     nimbusUI.getDefaults() 
       .put("TabbedPane:TabbedPaneContent.[Enabled+Pressed].backgroundPainter", 
         new TabbedPane_TabContent_Painter(new Color(255, 255, 
           255), new Color(255, 255, 255))); 
    } 

    public class TabbedPane_TabContent_Painter implements Painter { 
     private Color light, dark; 
     private GradientPaint gradPaint; 

     public TabbedPane_TabContent_Painter(Color light, Color dark) { 
      this.light = light; 
      this.dark = dark; 
     } 

     @Override 
     public void paint(Graphics2D g, Object c, int w, int h) { 
      Color shadowColorA = new Color(shadowColor.getRed(), 
        shadowColor.getGreen(), shadowColor.getBlue(), shadowAlpha); 
      if (highQuality) { 
       g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
         RenderingHints.VALUE_ANTIALIAS_ON); 
      } 
      if (shady) { 
       g.setColor(shadowColorA); 
       g.fillRoundRect(0, 0, w - shadowGap, h - shadowGap, arcs.width, 
         arcs.height); 
      } else { 
       shadowGap = 1; 
      } 
      gradPaint = new GradientPaint((w/2.0f), 0, new Color(255, 255, 
        255), (w/2.0f), (h/2.0f), new Color(255, 255, 255), 
        false); 
      g.setPaint(gradPaint); 
      g.fillRoundRect(shadowOffset,// X position 
        shadowOffset,// Y position 
        w - strokeSize - shadowOffset, // width 
        h - strokeSize - shadowOffset, // height 
        arcs.width, arcs.height);// arc Dimension 
      g.setColor(new Color(188, 188, 187, 130)); 
      g.setStroke(new BasicStroke(strokeSize)); 
      g.drawRoundRect(shadowOffset,// X position 
        shadowOffset,// Y position 
        w - strokeSize - shadowOffset, // width 
        h - strokeSize - shadowOffset, // height 
        arcs.width, arcs.height);// arc Dimension 
      g.setStroke(new BasicStroke()); 
     } 
    } 

    public class TabbedPane_TabView_Painter implements Painter { 
     private Color light, dark; 
     private GradientPaint gradPaint; 

     public TabbedPane_TabView_Painter(Color light, Color dark) { 
      this.light = light; 
      this.dark = dark; 
     } 

     @Override 
     public void paint(Graphics2D g, Object c, int w, int h) { 
      Color shadowColor = Color.black; 
      Color shadowColorA = new Color(shadowColor.getRed(), 
        shadowColor.getGreen(), shadowColor.getBlue(), 150); 
      g.setColor(shadowColorA); 
      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
        RenderingHints.VALUE_ANTIALIAS_ON); 
      gradPaint = new GradientPaint((w/2.0f), 0, light, (w/2.0f), 
        (h/2.0f), dark, true); 
      g.setPaint(gradPaint); 
     } 
    } 

    public class TabbedPanePainter implements Painter { 
     private Color light, dark; 
     private GradientPaint gradPaint; 

     public TabbedPanePainter(Color light, Color dark) { 
      this.light = light; 
      this.dark = dark; 
     } 

     @Override 
     public void paint(Graphics2D g, Object c, int w, int h) { 
      Color shadowColor = Color.black; 
      Color shadowColorA = new Color(shadowColor.getRed(), 
        shadowColor.getGreen(), shadowColor.getBlue(), 150); 
      g.setColor(shadowColorA); 
      g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
        RenderingHints.VALUE_ANTIALIAS_ON); 
      gradPaint = new GradientPaint((w/2.0f), 0, light, (w/2.0f), 
        (h/2.0f), dark, true); 
      g.setPaint(gradPaint); 
      // g.fillRect(2, 2, (w - 5), (h - 5)); 
      g.fillRoundRect(2, 2, (w - 5), (h - 5), 6, 6); 
     } 
    } 
}

我喜欢的结果

，但我想acchive 阴影效果选项卡窗格和阴影的四边为选择的选项卡窗格TAB也。像这样

Appetiate您帮助&建议。

来源

2016-02-25 Kathi

为了得到更好的帮助更快：

检查了这一点：Nimbus Defaults (The Java™ Tutorials > Creating a GUI With JFC/Swing > Modifying the Look and Feel)并从TabbedPaneTheme类，例如不必要的按键TabbedPane:...font，TabbedPane:TabbedPaneContent.[Enabled+Pressed]...
删除无关的代码：Color light, dark;，CitiesPanel，ColorsPanel类，NimbusBaseUI#initialize()方法，...
TabbedPane_TabView_Painter没有做任何事情。

这里是我的尝试：

import java.awt.*; 
import java.awt.geom.*; 
import javax.swing.*; 
import javax.swing.plaf.nimbus.NimbusLookAndFeel; 

public class NimbusTabbedPaneTest { 
    public JComponent makeUI() { 
    JTabbedPane tabbedPane = new JTabbedPane(); 
    tabbedPane.addTab("World Cities", new JScrollPane(new JTree())); 
    tabbedPane.addTab("Colors ",  new JSplitPane()); 
    tabbedPane.addTab("World Cities", new JScrollPane(new JTextArea())); 
    tabbedPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); 
    return tabbedPane; 
    } 
    public static void main(String... args) { 
    EventQueue.invokeLater(() -> { 
     try { 
     new NimbusBaseUI(); 
     } catch (Exception e) { 
     e.printStackTrace(); 
     } 
     JFrame f = new JFrame("Nimbus Base Demo"); 
     f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     f.getContentPane().add(new NimbusTabbedPaneTest().makeUI()); 
     f.setSize(400, 400); 
     f.setLocationRelativeTo(null); 
     f.setVisible(true); 
    }); 
    } 
} 

class NimbusBaseUI extends NimbusLookAndFeel { 
    public NimbusBaseUI() { 
    super(); 
    try { 
     new TabbedPaneTheme(this); 
     UIManager.setLookAndFeel(this); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    } 
} 

class TabbedPaneTheme { 
    protected static int OVERPAINT = 6; 
    protected static int shadowOffset = 1; 
    protected static int strokeSize = 2; 
    protected static Dimension arcs = new Dimension(10, 10); 
    public TabbedPaneTheme(NimbusBaseUI nimbusUI) { 
    UIDefaults d = nimbusUI.getDefaults(); 

    d.put("TabbedPane:TabbedPaneContent.contentMargins", new Insets(0, 5, 5, 5)); 
    //d.put("TabbedPane:TabbedPaneTab.contentMargins",  new Insets(2, 8, 3, 8)); 
    //d.put("TabbedPane:TabbedPaneTabArea.contentMargins", new Insets(3, 10, 4, 10)); 
    d.put("TabbedPane:TabbedPaneTabArea.contentMargins", 
      new Insets(3, 10, OVERPAINT, 10)); 

    Painter<JComponent> tabAreaPainter = new TabAreaPainter(); 
    d.put("TabbedPane:TabbedPaneTabArea[Disabled].backgroundPainter", 
      tabAreaPainter); 
    d.put("TabbedPane:TabbedPaneTabArea[Enabled].backgroundPainter", 
      tabAreaPainter); 
    d.put("TabbedPane:TabbedPaneTabArea[Enabled+MouseOver].backgroundPainter", 
      tabAreaPainter); 
    d.put("TabbedPane:TabbedPaneTabArea[Enabled+Pressed].backgroundPainter", 
      tabAreaPainter); 

    d.put("TabbedPane:TabbedPaneContent.backgroundPainter", 
      new TabContentPainter()); 

    Painter<JComponent> tabPainter = new TabPainter(Color.ORANGE, false); 
    d.put("TabbedPane:TabbedPaneTab[Enabled+MouseOver].backgroundPainter", 
      tabPainter); 
    d.put("TabbedPane:TabbedPaneTab[Enabled+Pressed].backgroundPainter", 
      tabPainter); 
    d.put("TabbedPane:TabbedPaneTab[Enabled].backgroundPainter", 
      tabPainter); 

    Painter<JComponent> selectedTabPainter = new TabPainter(Color.WHITE, true); 
    d.put("TabbedPane:TabbedPaneTab[Focused+MouseOver+Selected].backgroundPainter", 
      selectedTabPainter); 
    d.put("TabbedPane:TabbedPaneTab[Focused+Pressed+Selected].backgroundPainter", 
      selectedTabPainter); 
    d.put("TabbedPane:TabbedPaneTab[Focused+Selected].backgroundPainter", 
      selectedTabPainter); 
    d.put("TabbedPane:TabbedPaneTab[MouseOver+Selected].backgroundPainter", 
      selectedTabPainter); 
    d.put("TabbedPane:TabbedPaneTab[Selected].backgroundPainter", 
      selectedTabPainter); 
    d.put("TabbedPane:TabbedPaneTab[Pressed+Selected].backgroundPainter", 
      selectedTabPainter); 
    } 

    private static class TabPainter implements Painter<JComponent> { 
    private final Color color; 
    private int r = 6; 
    private int x = 3; 
    private int y = 3; 
    private boolean selected; 
    public TabPainter(Color color, boolean selected) { 
     this.color = color; 
     this.selected = selected; 
    } 
    @Override public void paint(Graphics2D g, JComponent c, int width, int height) { 
     int ex = selected ? OVERPAINT : 0; 
     Graphics2D g2 = (Graphics2D) g.create(0, 0, width, height + ex); 
     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
          RenderingHints.VALUE_ANTIALIAS_ON); 
     int w = width - 6 - 1; 
     int h = height + r; 
     for (int i = 0; i < 3; i++) { 
     g2.setColor(new Color(0, 0, 0, 20)); 
     g2.fill(new RoundRectangle2D.Double(x - i, y - i, w + i + i, h, r, r)); 
     } 
     g2.setColor(color); 
     g2.fill(new RoundRectangle2D.Double(x, y, w, h + 4, r, r)); 
     g2.dispose(); 
    } 
    } 

    private static class TabAreaPainter implements Painter<JComponent> { 
    @Override public void paint(Graphics2D g, JComponent c, int w, int h) { 
     Graphics2D g2 = (Graphics2D) g.create(0, 0, w, h); 
     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
          RenderingHints.VALUE_ANTIALIAS_ON); 

     RoundRectangle2D r = new RoundRectangle2D.Double(
     shadowOffset,// X position 
     shadowOffset + h - OVERPAINT,// Y position 
     w - strokeSize - shadowOffset, // width 
     40, // height 
     arcs.width, arcs.height);// arc Dimension 

     g2.setPaint(Color.CYAN); 
     g2.fill(r); 
     g2.setColor(Color.RED); 
     g2.setStroke(new BasicStroke(strokeSize)); 
     g2.draw(r); 
     g2.dispose(); 
    } 
    } 

    private static class TabContentPainter implements Painter<JComponent> { 
    @Override public void paint(Graphics2D g, JComponent c, int w, int h) { 
     Graphics2D g2 = (Graphics2D) g.create(0, 0, w, h); 
     g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
          RenderingHints.VALUE_ANTIALIAS_ON); 

     g2.translate(0, -OVERPAINT); 
     h += OVERPAINT; 

     RoundRectangle2D r = new RoundRectangle2D.Double(
     shadowOffset,// X position 
     shadowOffset,// Y position 
     w - strokeSize - shadowOffset, // width 
     h - strokeSize - shadowOffset, // height 
     arcs.width, arcs.height);// arc Dimension 

     g2.setPaint(Color.WHITE); 
     g2.fill(r); 
     g2.setColor(Color.ORANGE); 
     g2.setStroke(new BasicStroke(strokeSize)); 
     g2.draw(r); 
     g2.dispose(); 
    } 
    } 
}

来源

2016-02-28 07:11:54 aterai

谢谢，我带删除尝试了所有不必要的代码，但没有运气。我可以知道如何在TAB之间获得空间吗？？ – Kathi

如何在Java swing中实现TabbedPane的四面阴影效果？

回答

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