Accessing a JTextField in JTableHeader

Question

I have made a TableHeader renderer that will create a JTextfield under the Label of the header in a JTable. The problem i got now, i never get focus/access to this JTextfield in the header.

I found out that a TableHeader renderer only draws the component and dont do the rest, like focus and stuff.

I have tryed to make a array of JTextfield that will set on the header, so i can access them on code base. Unlucky that didnt workout, i was wondering if its possible to get access to this JTextField in the header and what is the best way to do this.

Tableheader renderer:

public class TextFieldTableHeaderRenderer extends AbstractCellEditor implements TableCellRenderer {

private MyPanel component;

public TextFieldTableHeaderRenderer(){
}

@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
    component = new MyPanel(column);
    ((MyPanel)component).setLabelText(value.toString());
    return component;
}

@Override
public Object getCellEditorValue() {
    return ((MyPanel)component).getTextField(); 
}

MyPanel:

public class MyPanel extends JPanel {  

private javax.swing.JLabel label;
private javax.swing.JTextField textField;

public MyPanel(int column) {   
    super();   
    setLayout(new java.awt.BorderLayout());   
    label = new javax.swing.JLabel();   
    textField = new javax.swing.JTextField();  


    setBorder(javax.swing.BorderFactory.createEtchedBorder());

    label.setHorizontalAlignment(SwingConstants.CENTER);

    //textField.setText("Column "+column);

    add(textField, java.awt.BorderLayout.PAGE_END);

    add(label, java.awt.BorderLayout.CENTER);   
}   

public void setLabelText( String text ){
    label.setText(text);
}

public void setTextFieldText(String text){
    getTextField().setText(text);
}

public javax.swing.JTextField getTextField() {   
    return textField;   
}

/**
 * @param textField the textField to set
 */
public void setTextField(javax.swing.JTextField textField) {
    this.textField = textField;
}

Install on header:

for( int i=0; i < this.getxColumnModel().getColumnCount(); i++){
            this.getxColumnModel().getColumn(i, true).setHeaderRenderer( new TextFieldTableHeaderRenderer() );
        }

I have try to use the "EditableHeader" example from the i-net, but it makes a new JTextfield when clicking on the header.

I like to see that the user get focus on the JTextfield, enters a text and then it will filter the column.

Filtering wont be a problem, cause i have made that already.

Hopefully im clear to you guys/girls and love to hear you solution

Answer 1

Here's a simple approach for making editable headers:

EDIT: oops - I meant to post this in another thread. I guess I'll keep it here anyway.

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;

public class JTableEditableHeaderDemo implements Runnable
{
  private JTable table;
  private JTableHeader header;
  private JPopupMenu renamePopup;
  private JTextField text;
  private TableColumn column;

  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new JTableEditableHeaderDemo());
  }

  public JTableEditableHeaderDemo()
  {
    table = new JTable(10, 5);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.setPreferredScrollableViewportSize(table.getPreferredSize());

    header = table.getTableHeader();
    header.addMouseListener(new MouseAdapter(){
      @Override
      public void mouseClicked(MouseEvent event)
      {
        if (event.getClickCount() == 2)
        {
          editColumnAt(event.getPoint());
        }
      }
    });

    text = new JTextField();
    text.setBorder(null);
    text.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e)
      {
        renameColumn();
      }
    });

    renamePopup = new JPopupMenu();
    renamePopup.setBorder(new MatteBorder(0, 1, 1, 1, Color.DARK_GRAY));
    renamePopup.add(text);
  }

  public void run()
  {
    JFrame f = new JFrame("Double-click header to edit");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(new JScrollPane(table));
    f.pack();
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }

  private void editColumnAt(Point p)
  {
    int columnIndex = header.columnAtPoint(p);

    if (columnIndex != -1)
    {
      column = header.getColumnModel().getColumn(columnIndex);
      Rectangle columnRectangle = header.getHeaderRect(columnIndex);

      text.setText(column.getHeaderValue().toString());
      renamePopup.setPreferredSize(
          new Dimension(columnRectangle.width, columnRectangle.height - 1));
      renamePopup.show(header, columnRectangle.x, 0);

      text.requestFocusInWindow();
      text.selectAll();
    }
  }

  private void renameColumn()
  {
    column.setHeaderValue(text.getText());
    renamePopup.setVisible(false);
    header.repaint();
  }
}

Answer 2

TableColumn supports setting a TableCellRenderer via setHeaderRenderer(), as shown in this example; it has no provision for setHeaderEditor(), which would be required for editing. Alternatives might include these:

• Write a custom JTableHeader.
• Add a row of text fields in an adjacent, conformal layout.
• Use a particular row in the TableModel, as suggested in FixedRowExample.
• Consider a commercial alternative; several are listed here.