如何设置JLabel的背景和边框与表头相同？

我想使用JLabel重新创建一个表头。 JLabel的外观和感觉需要与系统指定的JTableHeader完全相同。

这是我到目前为止所尝试的：

 JLabel header = new JLabel("Title"); header.setOpaque(true); header.setBackground(UIManager.getColor(new JTableHeader().getBackground())); header.setBorder(UIManager.getBorder(new JTableHeader().getBorder())); 

但是， UIManager为颜色和边框返回null 。

有任何想法吗？

这就是我设置外观的方式：

 javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName()); 

Answer 1

然后涉及到更多问题，只需获取表头的颜色和边框。 每个单元格/列都由TableCellRenderer呈现，这意味着UIManager返回的值可能会被忽略…

例如，下面呈现JTableHeader并根据窗口外观下的UIManager返回的值将边框/背景应用于JLabel …

如您所见，它们之间存在很大差异

但是，如果您感兴趣的是在滚动窗格上的另一个组件的顶部显示某种“组头”，则可以直接将JTableHeader添加到滚动窗格列视图中…

 public class TestHeader { public static void main(String[] args) { new TestHeader(); } public TestHeader() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException ex) { } catch (InstantiationException ex) { } catch (IllegalAccessException ex) { } catch (UnsupportedLookAndFeelException ex) { } TableColumnModel model = new DefaultTableColumnModel(); final TableColumn column = new TableColumn(0, 250); column.setHeaderValue("Test"); model.addColumn(column); JTableHeader header = new JTableHeader(); header.setColumnModel(model); final JTextArea textArea = new JTextArea(); JScrollPane scrollPane = new JScrollPane(textArea); scrollPane.setColumnHeaderView(header); textArea.addComponentListener(new ComponentAdapter() { @Override public void componentResized(ComponentEvent e) { column.setWidth(textArea.getWidth()); } }); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(scrollPane); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } 

更新

 public class TestHeader { public static void main(String[] args) { new TestHeader(); } public TestHeader() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException ex) { } catch (InstantiationException ex) { } catch (IllegalAccessException ex) { } catch (UnsupportedLookAndFeelException ex) { } TableColumnModel model = new DefaultTableColumnModel(); final TableColumn column = new TableColumn(0, 250); column.setHeaderValue("I don't see the problem"); model.addColumn(column); final JTableHeader header = new JTableHeader(); header.setColumnModel(model); DefaultTableModel tm = new DefaultTableModel(new Object[]{"A", "B", "C"}, 0); tm.addRow(new Object[]{"1", "2", "3", "4"}); tm.addRow(new Object[]{"5", "6", "7", "8"}); tm.addRow(new Object[]{"9", "10", "11", "12"}); tm.addRow(new Object[]{"13", "14", "15", "16"}); final JTable table = new JTable(tm); final JScrollPane scrollPane = new JScrollPane(table); /** * For some reason, the header isn't being applied as soon as the * table is added to the scroll pane, so we need to jump our next * request to the end of the of event queue so that it will * occur some time in the future */ SwingUtilities.invokeLater(new Runnable() { @Override public void run() { scrollPane.setColumnHeaderView(header); } }); table.addComponentListener(new ComponentAdapter() { @Override public void componentResized(ComponentEvent e) { column.setWidth(table.getWidth()); } }); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(scrollPane); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } 

Answer 2

尝试从UIManager获取默认值：

 Color color = UIManager.getColor("TableHeader.background"); Border border = UIManager.getBorder("TableHeader.CellBorder"); 

Answer 3

在尝试之前，您需要为应用程序设置外观：

 header.setBackground(UIManager.getColor(new JTableHeader().getBackground())); header.setBorder(UIManager.getBorder(new JTableHeader().getBorder())); 

你应该首先设置一个外观和感觉：

  try { for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (Exception e) { // If Nimbus is not available, you can set the GUI to another look and feel. } 

这是一个例子：

 import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.table.JTableHeader; public class Test { public Test() { initComponents(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { //set nimbus look and feel for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e) { e.printStackTrace(); } new Test(); } }); } private void initComponents() { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JLabel header = new JLabel("Title"); header.setBackground(UIManager.getColor(new JTableHeader().getBackground())); header.setBorder(UIManager.getBorder(new JTableHeader().getBorder())); frame.add(header); frame.pack(); frame.setVisible(true); } } 

Answer 4

我想我将创建一个没有任何行的JTable ，并在下面放置一个JTextPane 。 它就像魅力一样。

 JTextPane textPane = new JTextPane(); JPanel panel = new JPanel(new BorderLayout()); JTable table = new JTable(0, 1); table.setPreferredScrollableViewportSize(new Dimension(600, 0)); JScrollPane js = new JScrollPane(table) panel.add(js, BorderLayout.NORTH); panel.add(new JScrollPane(textPane),BorderLayout.CENTER);