I have a table with 3 columns, the first column is special and contains a checkbox instead of a title.
The problem is that the layout (appareance) of the checkbox header is different from the other headers. Can anyone help?
The Code:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
import java.awt.event.*;
public class JTableHeaderCheckBox
{
Object colNames[] = {"", "String", "String"};
Object[][] data = {};
DefaultTableModel dtm;
JTable table;
public void buildGUI()
{
dtm = new DefaultTableModel(data,colNames);
table = new JTable(dtm);
for(int x = 0; x < 2; x++)
{
dtm.addRow(new Object[]{new Boolean(false),"Row "+(x+1)+" Col 2","Row "+(x+1)+" Col 3"});
}
JScrollPane sp = new JScrollPane(table);
TableColumn tc = table.getColumnModel().getColumn(0);
tc.setCellEditor(table.getDefaultEditor(Boolean.class));
tc.setCellRenderer(table.getDefaultRenderer(Boolean.class));
tc.setHeaderRenderer(new CheckBoxHeader());
JFrame f = new JFrame();
f.getContentPane().add(sp);
f.pack();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
public static void main (String[] args)
{
SwingUtilities.invokeLater(new Runnable(){
public void run(){
new JTableHeaderCheckBox().buildGUI();
}
});
}
}
class CheckBoxHeader extends JCheckBox implements TableCellRenderer {
protected CheckBoxHeader rendererComponent;
protected int column;
public CheckBoxHeader() {
rendererComponent = this;
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
setColumn(column);
return rendererComponent;
}
protected void setColumn(int column) {
this.column = column;
}
public int getColumn() {
return column;
}
}
The wierd output:
UPDATE:
What I want:
- Center align the checkbox in the header
- If you pay close attention, you notice the background of the checkbox Header (it seems popping to the inside) is different from the other 2 headers (they seem popping out)
If you're referring to the border of the checkbox you can try this to make the header look more consistent: