Check Box in JTable header

[Mythily Jaganathan]

Hi All,

I have a problem in JTable With check box.

The rows can have the checkboxes, but what about the Checkbox in header?

When the Check box in header is selected, all the Check boxes in that column should be selected. i.e., it should act as select all.

Please help me!

Thanks
Mythily

[Michael Dunn]

adapted from here

http://www.codeguru.com/java/articles/664.shtml

    
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 < 5; 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(new MyItemListener()));
    JFrame f = new JFrame();
    f.getContentPane().add(sp);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }
  class MyItemListener implements ItemListener
  {
    public void itemStateChanged(ItemEvent e) {
      Object source = e.getSource();
      if (source instanceof AbstractButton == false) return;
      boolean checked = e.getStateChange() == ItemEvent.SELECTED;
      for(int x = 0, y = table.getRowCount(); x < y; x++)
      {
        table.setValueAt(new Boolean(checked),x,0);
      }
    }
  }
  public static void main (String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new JTableHeaderCheckBox().buildGUI();
      }
    });
  }
}
class CheckBoxHeader extends JCheckBox
    implements TableCellRenderer, MouseListener {
  protected CheckBoxHeader rendererComponent;
  protected int column;
  protected boolean mousePressed = false;
  public CheckBoxHeader(ItemListener itemListener) {
    rendererComponent = this;
    rendererComponent.addItemListener(itemListener);
  }
  public Component getTableCellRendererComponent(
      JTable table, Object value,
      boolean isSelected, boolean hasFocus, int row, int column) {
    if (table != null) {
      JTableHeader header = table.getTableHeader();
      if (header != null) {
        rendererComponent.setForeground(header.getForeground());
        rendererComponent.setBackground(header.getBackground());
        rendererComponent.setFont(header.getFont());
        header.addMouseListener(rendererComponent);
      }
    }
    setColumn(column);
    rendererComponent.setText("Check All");
    setBorder(UIManager.getBorder("TableHeader.cellBorder"));
    return rendererComponent;
  }
  protected void setColumn(int column) {
    this.column = column;
  }
  public int getColumn() {
    return column;
  }
  protected void handleClickEvent(MouseEvent e) {
    if (mousePressed) {
      mousePressed=false;
      JTableHeader header = (JTableHeader)(e.getSource());
      JTable tableView = header.getTable();
      TableColumnModel columnModel = tableView.getColumnModel();
      int viewColumn = columnModel.getColumnIndexAtX(e.getX());
      int column = tableView.convertColumnIndexToModel(viewColumn);
 
      if (viewColumn == this.column && e.getClickCount() == 1 && column != -1) {
        doClick();
      }
    }
  }
  public void mouseClicked(MouseEvent e) {
    handleClickEvent(e);
    ((JTableHeader)e.getSource()).repaint();
  }
  public void mousePressed(MouseEvent e) {
    mousePressed = true;
  }
  public void mouseReleased(MouseEvent e) {
  }
  public void mouseEntered(MouseEvent e) {
  }
  public void mouseExited(MouseEvent e) {
  }
}

[Mythily Jaganathan]

Hi Michael,
That was wonderful solution.
Thanks a lot.

Mythily

[Sham Phadtale]

Does java provide default checkbox renderer for JTable Header, as it provide for JTable cell?
For ex. -

tc.setHeaderRenderer(table.getDefaultRenderer(Boolean.class));   

How to capture event generated by click on JTable header ? Is there any method in java which get called when click on JTable header, like setValueAt() get called in case of click on cell?

Is it possible to do above program without using custom renderer for JTable header?

[Michael Dunn]

> How to capture event generated by click on JTable header ?

if there's nothing in the newer versions of java (assuming you've read the javadocs),
either read the posted code in this thread, or
look into the source code for JTable's rowSorter

[Jordan Walker]

Question.. I've looking at the code (Which helped a lot) But the only problem I've ran into is that when I take out the text in the JTable header... I think it says something like "setBorder(UIManager.getBorder("TableHeader.cellBorder"));" the jcheckbox appear pushed over into the corner is there away to fix this issues??