我为JTabe标头创建了一个自定义渲染器，但是在对表进行排序后，当我使用默认系统L＆F（在我的情况下是Windows 8）时，排序图标不会出现，但在使用Java L＆F时，该图标就会出现。
使用Java L＆F：
使用系统L＆F：
这是我的类渲染器：
private class HeaderRenderer implements TableCellRenderer{
private final LineBorder lb = new LineBorder(new Color(0, 152, 206));
private final Dimension dim = new Dimension(150, 25);
private TableCellRenderer delegate;
public HeaderRenderer(TableCellRenderer delegate) {
this.delegate = delegate;
}
@Override
public Component getTableCellRendererComponent(JTable table,Object value, boolean isSelected, boolean hasFocused, int row, int column) {
Component comp = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocused, row, column);
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
label.setBackground(Color.WHITE);
label.setPreferredSize(dim);
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setBorder(lb);
}
return comp;
}
}
使用：
JTableHeader tableHeaderCompnoent = table.getTableHeader();
tableHeaderCompnoent.setDefaultRenderer(new HeaderRenderer(tableHeaderCompnoent.getDefaultRenderer()));
编辑：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
public class TableRenderingAndSorting extends JFrame {
private JPanel contentPane;
private JTable table_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TableRenderingAndSorting frame = new TableRenderingAndSorting();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public TableRenderingAndSorting() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 497, 347);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new BorderLayout(0, 0));
table_1 = new JTable();
table_1.setModel(new DefaultTableModel(
new Object[][] {
{"1", "Jack", "Developper"},
{"2", "Richard", "Developper"},
{"3", "Jassmine", "Developper"},
{"4", "Tom", "Project leader"},
{"5", "Anna", null},
},
new String[] {
"Col1", "Col2", "Col3"
}
));
table_1.setAutoCreateRowSorter(true);
contentPane.add(new JScrollPane(table_1), BorderLayout.CENTER);
JTableHeader tableHeaderCompnoent = table_1.getTableHeader();
tableHeaderCompnoent.setDefaultRenderer(new HeaderRenderer(tableHeaderCompnoent.getDefaultRenderer()));
table_1.getTableHeader().setDefaultRenderer(new HeaderRenderer(tableHeaderCompnoent.getDefaultRenderer()));
}
private class HeaderRenderer implements TableCellRenderer{
private final LineBorder lb = new LineBorder(new Color(0, 152, 206));
private final Dimension dim = new Dimension(150, 25);
private TableCellRenderer delegate;
public HeaderRenderer(TableCellRenderer delegate) {
this.delegate = delegate;
}
@Override
public Component getTableCellRendererComponent(JTable table,Object value, boolean isSelected, boolean hasFocused, int row, int column) {
Component comp = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocused, row, column);
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
label.setBackground(Color.WHITE);
label.setPreferredSize(dim);
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setBorder(lb);
}
return comp;
}
}
}
最佳答案
当我使用默认系统L＆F（在我的情况下是Windows 8）时，排序图标不会出现，但是当我使用Java L＆F时，该图标就会出现。
默认L＆F（金属）和系统L＆F之间的区别在于，第一个在标题单元格的中心（垂直对齐）绘制排序图标，而后者在标题单元格的顶部绘制。
接下来发生的是为标头单元格绘制边框。从组件的边缘向内绘制边框，这意味着它在组件的区域上绘制。由于排序图标位于系统L＆F的边缘，因此会被边框覆盖。
您可以通过删除边框或将标签添加到将处理边框的JPanel来解决此问题：
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocused, int row, int column) {
Component comp = delegate.getTableCellRendererComponent(table, value, isSelected, hasFocused, row, column);
JPanel panel = new JPanel(new BorderLayout());
if (comp instanceof JLabel) {
JLabel label = (JLabel) comp;
label.setBackground(Color.WHITE);
label.setHorizontalAlignment(SwingConstants.CENTER);
panel.add(label);
panel.setBorder(lb);
}
return panel;
}
我已按照@mKorbel的说明删除了
setPreferredSize，并且应该将dim字段删除。另外，在行中
JTableHeader tableHeaderCompnoent = table_1.getTableHeader();
tableHeaderCompnoent.setDefaultRenderer(new HeaderRenderer(tableHeaderCompnoent.getDefaultRenderer()));
table_1.getTableHeader().setDefaultRenderer(new HeaderRenderer(tableHeaderCompnoent.getDefaultRenderer()));
第2个和第3个相同，您可以删除第3个。