Java JTable 头渲染器
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JTable header renderer
提问by Alosyius
I'm trying to make the background of my JTableheader have a gradient.
我试图让我的JTable标题的背景有一个渐变。
This works fine using the code:
使用以下代码可以正常工作：
String[] colName = new String[] { "#", "Location", "Name" ,"Source", "System", "Hits", "Current", "Time" };
Object[][] products = new Object[][] {
};
dtm = new DefaultTableModel(products, colName) {
@Override
public boolean isCellEditable(int row, int column) {
//all cells false
return false;
}
};
table = new JTable( dtm );
table.setRowHeight(32);
table.getTableHeader().setReorderingAllowed(false);
table.setDefaultRenderer(Object.class, new VisitorRenderer());
table.setFont(new java.awt.Font("Tahoma", Font.PLAIN, 12));
table.getColumnModel().getColumn(0).setMinWidth(5);
table.getColumnModel().getColumn(1).setMinWidth(50);
table.getColumnModel().getColumn(2).setMinWidth(5);
table.getColumnModel().getColumn(3).setMinWidth(5);
table.getColumnModel().getColumn(4).setMinWidth(5);
table.getColumnModel().getColumn(5).setMinWidth(3);
table.getColumnModel().getColumn(6).setMinWidth(230);
table.getColumnModel().getColumn(7).setMinWidth(3);
final JTableHeader header = table.getTableHeader();
header.setPreferredSize(new Dimension(100, 37));
header.setDefaultRenderer(new DefaultTableCellHeaderRenderer() {
private Object selectedColumn;
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
GradientPaint gp = new GradientPaint(0, 0,
new java.awt.Color(237, 237, 237), 0, getHeight(),
new java.awt.Color(222, 222, 222));
g2d.setPaint(gp);
g2d.fillRect(0, 0, getWidth(), getHeight());
}
@Override
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
DefaultTableCellHeaderRenderer rendererComponent = (DefaultTableCellHeaderRenderer) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
if (selectedColumn == value) {
rendererComponent.setBorder(BorderFactory.createCompoundBorder(rendererComponent.getBorder(), BorderFactory.createLineBorder(Color.red, 1)));
rendererComponent.setHorizontalAlignment(SwingConstants.LEFT);
} else {
rendererComponent.setBorder(BorderFactory.createCompoundBorder(rendererComponent.getBorder(), BorderFactory.createEmptyBorder(0, 5, 0, 0)));
rendererComponent.setHorizontalAlignment(SwingConstants.CENTER);
}
if (column == 0) {
rendererComponent.setForeground(header.getForeground());
} else {
rendererComponent.setForeground(header.getForeground());
}
return rendererComponent;
}
});
However for some reason all I cannot see my border and text, it seems like the text also got the gradient applied?
但是由于某种原因，我看不到我的边框和文本，似乎文本也应用了渐变？
I'd like to have the text black and a colored border between my columns. Any ideas?
我希望在我的列之间使用黑色文本和彩色边框。有任何想法吗？
回答by trashgod
The class, sun.swing.table.DefaultTableCellHeaderRenderer, is not a good choice for this. Instead, obtain a reference and wrap it in your implementation of TableCellRenderer, as shown here. See also Darryl Burke's Default Table Header Cell Renderer.
类 ,sun.swing.table.DefaultTableCellHeaderRenderer不是一个好的选择。取而代之的是，要获得一个基准，敷在你的实现TableCellRenderer，如图所示这里。另请参阅 Darryl Burke 的默认表头单元格渲染器。
