• 只是想在JTableHeader中使用TableCellEditor是错误的，也不是multi_line_header，要买Jide(支持)

• 使用 JTextField 中的 RowFilter 尽可能简单，

• 注意不要忘记从视图坐标到模型坐标

.

.

import java.awt.*;导入 javax.swing.*；导入 javax.swing.event.*；导入 javax.swing.table.*；//代码基于@camickr 的帖子公共类 TableFilterRow 实现 TableColumnModelListener {私有静态最终长序列版本UID = 1L；私有 JFrame 框架 = new JFrame();私有 JTable 表 = 新 JTable(3, 5);private JScrollPane scrollPane = new JScrollPane(table);//文本字段面板私有 JPanel filterRow = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));公共表过滤器行(){table.setPreferredScrollableViewportSize(table.getPreferredSize());table.getColumnModel().addColumnModelListener(this);filterRow = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));for (int i = 0; i < table.getColumnCount(); i++) {filterRow.add(new JTextField(" Sum at -" + i));}columnMarginChanged(new ChangeEvent(table.getColumnModel()));frame.add(scrollPane);frame.add(filterRow, BorderLayout.SOUTH);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);框架.pack();frame.setLocationRelativeTo(null);frame.setVisible(true);}//实现 TableColumnModelListener 方法//(注意:你应该能够而不是实现一个监听器//覆盖 JTable 的 columnMarginChanged 和 columMoved 方法)@覆盖公共无效columnMarginChanged(ChangeEvent e){TableColumnModel tcm = table.getColumnModel();int columns = tcm.getColumnCount();for (int i = 0; i < 列; i++) {JTextField textField = (JTextField) filterRow.getComponent(i);维度 d = textField.getPreferredSize();d.width = tcm.getColumn(i).getWidth();textField.setPreferredSize(d);}SwingUtilities.invokeLater(new Runnable() {@覆盖公共无效运行(){filterRow.revalidate();}});}@覆盖公共无效列移动(TableColumnModelEvent e){组件已移动 = filterRow.getComponent(e.getFromIndex());filterRow.remove(e.getFromIndex());filterRow.add(移动，e.getToIndex());filterRow.validate();}@覆盖公共无效列添加(TableColumnModelEvent e){}@覆盖公共无效columnRemoved(TableColumnModelEvent e){}@覆盖公共无效columnSelectionChanged(ListSelectionEvent e){}公共静态无效主要(字符串[]参数){SwingUtilities.invokeLater(new Runnable() {@覆盖公共无效运行(){TableFilterRow 框架 = 新 TableFilterRow();}});}}

I need to have multiple editable rows in JTable header, so that the same header column could contain both JTextField and JButton.

I have found how to implement editable header cells and how to split header cells. However it turned out that these approaches are somewhat different and I would need to fuse them into one.

Is there any multiple editable JTable header rows solutions which are already developed and so that I wouldn't need to reinvent the bicycle?

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What I have found so far:

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Editable Header row code taken from: http://www.java2s.com/Code/Java/Swing-Components/EditableHeaderTableExample2.htm

Code:

import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.EventObject;

import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.CellEditorListener;
import javax.swing.event.ChangeEvent;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

/**
* @version 1.0 08/22/99
*/
public class EditableHeaderTableExample2 extends JFrame {

public EditableHeaderTableExample2() {
     super("EditableHeader Example");

     JTable table = new JTable(7, 5);
     TableColumnModel columnModel = table.getColumnModel();
     table.setTableHeader(new EditableHeader(columnModel));

     String[] items = { "Dog", "Cat" };
     JComboBox combo = new JComboBox();
     for (int i = 0; i < items.length; i++) {
       combo.addItem(items[i]);
     }
     ComboRenderer renderer = new ComboRenderer(items);

     EditableHeaderTableColumn col;
     // column 1
     col = (EditableHeaderTableColumn) table.getColumnModel().getColumn(1);
     col.setHeaderValue(combo.getItemAt(0));
     col.setHeaderRenderer(renderer);
     col.setHeaderEditor(new DefaultCellEditor(combo));

     // column 3
     col = (EditableHeaderTableColumn) table.getColumnModel().getColumn(3);
     col.setHeaderValue(combo.getItemAt(0));
     //col.setHeaderRenderer(renderer);
     col.setHeaderEditor(new DefaultCellEditor(combo));

     JScrollPane pane = new JScrollPane(table);
     getContentPane().add(pane);
}

class ComboRenderer extends JComboBox implements TableCellRenderer {

     ComboRenderer(String[] items) {
       for (int i = 0; i < items.length; i++) {
         addItem(items[i]);
       }
     }

     public Component getTableCellRendererComponent(JTable table,
         Object value, boolean isSelected, boolean hasFocus, int row,
         int column) {
       setSelectedItem(value);
       return this;
     }
    }

    public static void main(String[] args) {
     EditableHeaderTableExample2 frame = new EditableHeaderTableExample2();
     frame.addWindowListener(new WindowAdapter() {
       public void windowClosing(WindowEvent e) {
         System.exit(0);
       }
     });
     frame.setSize(300, 100);
     frame.setVisible(true);
    }
}

class EditableHeader extends JTableHeader implements CellEditorListener {
    public final int HEADER_ROW = -10;

    transient protected int editingColumn;

    transient protected TableCellEditor cellEditor;

    transient protected Component editorComp;

    public EditableHeader(TableColumnModel columnModel) {
     super(columnModel);
     setReorderingAllowed(false);
     cellEditor = null;
     recreateTableColumn(columnModel);
    }

    public void updateUI() {
     setUI(new EditableHeaderUI());
     resizeAndRepaint();
     invalidate();
    }

    protected void recreateTableColumn(TableColumnModel columnModel) {
     int n = columnModel.getColumnCount();
     EditableHeaderTableColumn[] newCols = new EditableHeaderTableColumn[n];
     TableColumn[] oldCols = new TableColumn[n];
     for (int i = 0; i < n; i++) {
       oldCols[i] = columnModel.getColumn(i);
       newCols[i] = new EditableHeaderTableColumn();
       newCols[i].copyValues(oldCols[i]);
     }
     for (int i = 0; i < n; i++) {
       columnModel.removeColumn(oldCols[i]);
     }
     for (int i = 0; i < n; i++) {
       columnModel.addColumn(newCols[i]);
     }
    }

    public boolean editCellAt(int index) {
     return editCellAt(index);
    }

    public boolean editCellAt(int index, EventObject e) {
     if (cellEditor != null && !cellEditor.stopCellEditing()) {
       return false;
     }
     if (!isCellEditable(index)) {
       return false;
     }
     TableCellEditor editor = getCellEditor(index);

     if (editor != null && editor.isCellEditable(e)) {
       editorComp = prepareEditor(editor, index);
       editorComp.setBounds(getHeaderRect(index));
       add(editorComp);
       editorComp.validate();
       setCellEditor(editor);
       setEditingColumn(index);
       editor.addCellEditorListener(this);

       return true;
     }
     return false;
    }

    public boolean isCellEditable(int index) {
     if (getReorderingAllowed()) {
       return false;
     }
     int columnIndex = columnModel.getColumn(index).getModelIndex();
     EditableHeaderTableColumn col = (EditableHeaderTableColumn) columnModel
         .getColumn(columnIndex);
     return col.isHeaderEditable();
    }

    public TableCellEditor getCellEditor(int index) {
     int columnIndex = columnModel.getColumn(index).getModelIndex();
     EditableHeaderTableColumn col = (EditableHeaderTableColumn) columnModel
         .getColumn(columnIndex);
     return col.getHeaderEditor();
    }

    public void setCellEditor(TableCellEditor newEditor) {
     TableCellEditor oldEditor = cellEditor;
     cellEditor = newEditor;

     // firePropertyChange

     if (oldEditor != null && oldEditor instanceof TableCellEditor) {
       ((TableCellEditor) oldEditor)
           .removeCellEditorListener((CellEditorListener) this);
     }
     if (newEditor != null && newEditor instanceof TableCellEditor) {
       ((TableCellEditor) newEditor)
           .addCellEditorListener((CellEditorListener) this);
     }
    }

    public Component prepareEditor(TableCellEditor editor, int index) {
     Object value = columnModel.getColumn(index).getHeaderValue();
     boolean isSelected = true;
     int row = HEADER_ROW;
     JTable table = getTable();
     Component comp = editor.getTableCellEditorComponent(table, value,
         isSelected, row, index);
     if (comp instanceof JComponent) {
        ((JComponent) comp).setNextFocusableComponent(this);
     }
     return comp;
    }

    public TableCellEditor getCellEditor() {
     return cellEditor;
    }

    public Component getEditorComponent() {
     return editorComp;
    }

    public void setEditingColumn(int aColumn) {
     editingColumn = aColumn;
    }

    public int getEditingColumn() {
     return editingColumn;
    }

    public void removeEditor() {
     TableCellEditor editor = getCellEditor();
     if (editor != null) {
       editor.removeCellEditorListener(this);

       requestFocus();
       remove(editorComp);

       int index = getEditingColumn();
       Rectangle cellRect = getHeaderRect(index);

       setCellEditor(null);
       setEditingColumn(-1);
       editorComp = null;

       repaint(cellRect);
     }
    }

    public boolean isEditing() {
     return (cellEditor == null) ? false : true;
    }

    //
    // CellEditorListener
    //
    public void editingStopped(ChangeEvent e) {
     TableCellEditor editor = getCellEditor();
     if (editor != null) {
       Object value = editor.getCellEditorValue();
       int index = getEditingColumn();
       columnModel.getColumn(index).setHeaderValue(value);
       removeEditor();
     }
    }

    public void editingCanceled(ChangeEvent e) {
     removeEditor();
    }

    //
    // public void setReorderingAllowed(boolean b) {
    //   reorderingAllowed = false;
    // }    
}

class EditableHeaderUI extends BasicTableHeaderUI {

    protected MouseInputListener createMouseInputListener() {
     return new MouseInputHandler((EditableHeader) header);
    }

    public class MouseInputHandler extends BasicTableHeaderUI.MouseInputHandler {
         private Component dispatchComponent;

         protected EditableHeader header;

         public MouseInputHandler(EditableHeader header) {
           this.header = header;
         }

         private void setDispatchComponent(MouseEvent e) {
           Component editorComponent = header.getEditorComponent();
           Point p = e.getPoint();
           Point p2 = SwingUtilities.convertPoint(header, p, editorComponent);
           dispatchComponent = SwingUtilities.getDeepestComponentAt(
               editorComponent, p2.x, p2.y);
         }

         private boolean repostEvent(MouseEvent e) {
           if (dispatchComponent == null) {
             return false;
           }
           MouseEvent e2 = SwingUtilities.convertMouseEvent(header, e,
               dispatchComponent);
           dispatchComponent.dispatchEvent(e2);
           return true;
         }

         public void mousePressed(MouseEvent e) {
           if (!SwingUtilities.isLeftMouseButton(e)) {
             return;
           }
           super.mousePressed(e);

           if (header.getResizingColumn() == null) {
             Point p = e.getPoint();
             TableColumnModel columnModel = header.getColumnModel();
             int index = columnModel.getColumnIndexAtX(p.x);
             if (index != -1) {
               if (header.editCellAt(index, e)) {
                 setDispatchComponent(e);
                 repostEvent(e);
               }
             }
           }
         }

         public void mouseReleased(MouseEvent e) {
           super.mouseReleased(e);
           if (!SwingUtilities.isLeftMouseButton(e)) {
             return;
           }
           repostEvent(e);
           dispatchComponent = null;
         }

    }   

}

class EditableHeaderTableColumn extends TableColumn {

    protected TableCellEditor headerEditor;

    protected boolean isHeaderEditable;

    public EditableHeaderTableColumn() {
     setHeaderEditor(createDefaultHeaderEditor());
     isHeaderEditable = true;
    }

    public void setHeaderEditor(TableCellEditor headerEditor) {
     this.headerEditor = headerEditor;
    }

    public TableCellEditor getHeaderEditor() {
     return headerEditor;
    }

    public void setHeaderEditable(boolean isEditable) {
     isHeaderEditable = isEditable;
    }

    public boolean isHeaderEditable() {
     return isHeaderEditable;
    }

    public void copyValues(TableColumn base) {
     modelIndex = base.getModelIndex();
     identifier = base.getIdentifier();
     width = base.getWidth();
     minWidth = base.getMinWidth();
     setPreferredWidth(base.getPreferredWidth());
     maxWidth = base.getMaxWidth();
     headerRenderer = base.getHeaderRenderer();
     headerValue = base.getHeaderValue();
     cellRenderer = base.getCellRenderer();
     cellEditor = base.getCellEditor();
     isResizable = base.getResizable();
    }

    protected TableCellEditor createDefaultHeaderEditor() {
     return new DefaultCellEditor(new JTextField());
    }

}

---

Multiple rows in the same JTable header column code (Fixed for java 7) taken from: http://www.java2s.com/Code/Java/Swing-Components/GroupableGroupHeaderExample.htm

Code: Column group class:

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;


/**
 * ColumnGroup
 *
 * @version 1.0 10/20/98
 * @author Nobuo Tamemasa
 */

class ColumnGroup {
  protected TableCellRenderer renderer;
  protected Vector v;
  protected String text;
  protected int margin=0;

  public ColumnGroup(String text) {
    this(null,text);
  }

  public ColumnGroup(TableCellRenderer renderer,String text) {
    if (renderer == null) {
      this.renderer = new DefaultTableCellRenderer() {
          public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
             JTableHeader header = table.getTableHeader();
              if (header != null) {
                  setForeground(header.getForeground());
                  setBackground(header.getBackground());
                  setFont(header.getFont());
              }
              setHorizontalAlignment(JLabel.CENTER);
              setText((value == null) ? "" : value.toString());
              setBorder(UIManager.getBorder("TableHeader.cellBorder"));
              return this;
          }
      };
    } else {
      this.renderer = renderer;
    }
    this.text = text;
    v = new Vector();
  }


  /**
   * @param obj    TableColumn or ColumnGroup
   */
  public void add(Object obj) {
    if (obj == null) { return; }
    v.addElement(obj);
    /*if(obj instanceof JTextField) {
        this.setHeaderRenderer(renderer)
    }*/
  }


  /**
   * @param c    TableColumn
   * @param v    ColumnGroups
   */
  public Vector getColumnGroups(TableColumn c, Vector g) {
    g.addElement(this);
    if (v.contains(c)) return g;    
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
      Object obj = e.nextElement();
      if (obj instanceof ColumnGroup) {
        Vector groups = 
          (Vector)((ColumnGroup)obj).getColumnGroups(c,(Vector)g.clone());
        if (groups != null) return groups;
      }
    }
    return null;
  }

  public TableCellRenderer getHeaderRenderer() {
    return renderer;
  }

  public void setHeaderRenderer(TableCellRenderer renderer) {
    if (renderer != null) {
       this.renderer = renderer;
    }
  }

  public Object getHeaderValue() {
    return text;
  }

  public Dimension getSize(JTable table) {
    Component comp = renderer.getTableCellRendererComponent(
        table, getHeaderValue(), false, false,-1, -1);
    int height = comp.getPreferredSize().height; 
    int width  = 0;
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
      Object obj = e.nextElement();
      if (obj instanceof TableColumn) {
        TableColumn aColumn = (TableColumn)obj;
        width += aColumn.getWidth();
        //width += margin;
      } else {
        width += ((ColumnGroup)obj).getSize(table).width;
      }
    }
    return new Dimension(width, height);
  }

  public void setColumnMargin(int margin) {
    this.margin = margin;
    Enumeration e = v.elements();
    while (e.hasMoreElements()) {
      Object obj = e.nextElement();
      if (obj instanceof ColumnGroup) {
         ((ColumnGroup)obj).setColumnMargin(margin);
       }
    }
  }

GroupableHeaderExample

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;

/**
 * @version 1.0 11/09/98
 */
public class GroupableHeaderExample extends JFrame {

  GroupableHeaderExample() {
    super( "Groupable Header Example" );

    String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };
    JComboBox petList = new JComboBox(petStrings);

    DefaultTableModel dm = new DefaultTableModel();
    dm.setDataVector(new Object[][]{
      {"foo","ja"},
      {"bar","en"}},
    new Object[]{new JTextField(), petList});//"Input box","Combo Box"});

    JTable table = new JTable( dm ) {
      protected JTableHeader createDefaultTableHeader() {
          return new GroupableTableHeader(columnModel);
      }
    };


    TableColumnModel cm = table.getColumnModel();
    ColumnGroup g_name = new ColumnGroup("Title1");
    g_name.add(cm.getColumn(0));
    //g_name.add(cm.getColumn(1));
    ColumnGroup g_lang = new ColumnGroup("Title2");
    g_lang.add(cm.getColumn(1));
    /*ColumnGroup g_other = new ColumnGroup("Others");
    g_other.add(cm.getColumn(4));
    g_other.add(cm.getColumn(5));
    g_lang.add(g_other);*/

    GroupableTableHeader header = (GroupableTableHeader)table.getTableHeader();
    header.addColumnGroup(g_name);
    header.addColumnGroup(g_lang);
    JScrollPane scroll = new JScrollPane( table );
    getContentPane().add( scroll );
    setSize( 400, 120 );   
  }

 public static void main(String[] args) {
    GroupableHeaderExample frame = new GroupableHeaderExample();
    frame.addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent e ) {
  System.exit(0);
      }
    });
    frame.setVisible(true);
  }
}

GroupableTableHeader class

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;

/**
  * GroupableTableHeader
  *
  * @version 1.0 10/20/98
  * @author Nobuo Tamemasa
  */

public class GroupableTableHeader extends JTableHeader {
  private static final String uiClassID = "GroupableTableHeaderUI";
  protected Vector columnGroups = null;

  public GroupableTableHeader(TableColumnModel model) {
    super(model);
    setUI(new GroupableTableHeaderUI());
    setReorderingAllowed(false);
  }
  public void updateUI(){
   setUI(new GroupableTableHeaderUI());
  }

  public void setReorderingAllowed(boolean b) {
    reorderingAllowed = false;
  }

  public void addColumnGroup(ColumnGroup g) {
    if (columnGroups == null) {
      columnGroups = new Vector();
    }
    columnGroups.addElement(g);
  }

  public Enumeration getColumnGroups(TableColumn col) {
    if (columnGroups == null) return null;
    Enumeration e = columnGroups.elements();
    while (e.hasMoreElements()) {
      ColumnGroup cGroup = (ColumnGroup)e.nextElement();
      Vector v_ret = (Vector)cGroup.getColumnGroups(col,new Vector());
      if (v_ret != null) { 
  return v_ret.elements();
      }
    }
    return null;
  }

  public void setColumnMargin() {
    if (columnGroups == null) return;
    int columnMargin = getColumnModel().getColumnMargin();
    Enumeration e = columnGroups.elements();
    while (e.hasMoreElements()) {
      ColumnGroup cGroup = (ColumnGroup)e.nextElement();
      cGroup.setColumnMargin(columnMargin);
    }
  }

}

GroupableTableHeaderUI class

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import javax.swing.plaf.basic.*;

public class GroupableTableHeaderUI extends BasicTableHeaderUI {

  public void paint(Graphics g, JComponent c) {
    Rectangle clipBounds = g.getClipBounds();
    if (header.getColumnModel() == null) return;
    ((GroupableTableHeader)header).setColumnMargin();
    int column = 0;
    Dimension size = header.getSize();
    Rectangle cellRect  = new Rectangle(0, 0, size.width, size.height);
    Hashtable h = new Hashtable();
    int columnMargin = header.getColumnModel().getColumnMargin();

    Enumeration enumeration = header.getColumnModel().getColumns();
    while (enumeration.hasMoreElements()) {
      cellRect.height = size.height;
      cellRect.y      = 0;
      TableColumn aColumn = (TableColumn)enumeration.nextElement();
      Enumeration cGroups = ((GroupableTableHeader)header).getColumnGroups(aColumn);
      if (cGroups != null) {
        int groupHeight = 0;
        while (cGroups.hasMoreElements()) {
          ColumnGroup cGroup = (ColumnGroup)cGroups.nextElement();
          Rectangle groupRect = (Rectangle)h.get(cGroup);
          if (groupRect == null) {
            groupRect = new Rectangle(cellRect);
            Dimension d = cGroup.getSize(header.getTable());
            groupRect.width  = d.width;
            groupRect.height = d.height;    
            h.put(cGroup, groupRect);
          }
          paintCell(g, groupRect, cGroup);
          groupHeight += groupRect.height;
          cellRect.height = size.height - groupHeight;
          cellRect.y      = groupHeight;
        }
      }      
      cellRect.width = aColumn.getWidth();// + columnMargin;
      if (cellRect.intersects(clipBounds)) {
        paintCell(g, cellRect, column);
      }
      cellRect.x += cellRect.width;
      column++;
    }
  }

  private void paintCell(Graphics g, Rectangle cellRect, int columnIndex) {
    TableColumn aColumn = header.getColumnModel().getColumn(columnIndex);
    TableCellRenderer renderer = aColumn.getHeaderRenderer();
    //revised by Java2s.com
    renderer = new DefaultTableCellRenderer(){
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
          JLabel header = new JLabel();
            header.setForeground(table.getTableHeader().getForeground());
            header.setBackground(table.getTableHeader().getBackground());
            header.setFont(table.getTableHeader().getFont());

          header.setHorizontalAlignment(JLabel.CENTER);
          header.setText(value.toString());
          header.setBorder(UIManager.getBorder("TableHeader.cellBorder"));
            return header;
        }

    };
    Component c = renderer.getTableCellRendererComponent(
        header.getTable(), aColumn.getHeaderValue(),false, false, -1, columnIndex);

        c.setBackground(UIManager.getColor("control"));

    rendererPane.add(c);
    rendererPane.paintComponent(g, c, header, cellRect.x, cellRect.y,
        cellRect.width, cellRect.height, true);
  }

  private void paintCell(Graphics g, Rectangle cellRect,ColumnGroup cGroup) {
    TableCellRenderer renderer = cGroup.getHeaderRenderer();
      //revised by Java2s.com
     // if(renderer == null){
//      return ;
  //    }

    Component component = renderer.getTableCellRendererComponent(
      header.getTable(), cGroup.getHeaderValue(),false, false, -1, -1);
    rendererPane.add(component);
    rendererPane.paintComponent(g, component, header, cellRect.x, cellRect.y,
        cellRect.width, cellRect.height, true);
  }

  private int getHeaderHeight() {
    int height = 0;
    TableColumnModel columnModel = header.getColumnModel();
    for(int column = 0; column < columnModel.getColumnCount(); column++) {
      TableColumn aColumn = columnModel.getColumn(column);
      TableCellRenderer renderer = aColumn.getHeaderRenderer();
      //revised by Java2s.com
      if(renderer == null){
      return 40;
      }

      Component comp = renderer.getTableCellRendererComponent(
        header.getTable(), aColumn.getHeaderValue(), false, false,-1, column);
      int cHeight = comp.getPreferredSize().height;
      Enumeration e = ((GroupableTableHeader)header).getColumnGroups(aColumn);      
      if (e != null) {
        while (e.hasMoreElements()) {
          ColumnGroup cGroup = (ColumnGroup)e.nextElement();
          cHeight += cGroup.getSize(header.getTable()).height;
        }
      }
      height = Math.max(height, cHeight);
    }
    return height;
  }

  private Dimension createHeaderSize(long width) {
    TableColumnModel columnModel = header.getColumnModel();
    width += columnModel.getColumnMargin() * columnModel.getColumnCount();
    if (width > Integer.MAX_VALUE) {
      width = Integer.MAX_VALUE;
    }
    return new Dimension((int)width, getHeaderHeight());
  }

  public Dimension getPreferredSize(JComponent c) {
    long width = 0;
    Enumeration enumeration = header.getColumnModel().getColumns();
    while (enumeration.hasMoreElements()) {
      TableColumn aColumn = (TableColumn)enumeration.nextElement();
      width = width + aColumn.getPreferredWidth();
    }
    return createHeaderSize(width);
  }
}

• just idea to use TableCellEditor in JTableHeader is wrong, nor multi_line_header, to buy Jide (support)

• simpler as is possible to use RowFilter from JTextField,

• note don't forget to convert indexes from view coordinates to model coordinates

.

.

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

//code based on posts by @camickr     

public class TableFilterRow implements TableColumnModelListener {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame();
    private JTable table = new JTable(3, 5);
    private JScrollPane scrollPane = new JScrollPane(table);
    // Panel for text fields
    private JPanel filterRow = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));

    public TableFilterRow() {
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        table.getColumnModel().addColumnModelListener(this);
        filterRow = new JPanel(new FlowLayout(FlowLayout.CENTER, 0, 0));
        for (int i = 0; i < table.getColumnCount(); i++) {
            filterRow.add(new JTextField(" Sum at - " + i));
        }
        columnMarginChanged(new ChangeEvent(table.getColumnModel()));
        frame.add(scrollPane);
        frame.add(filterRow, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

    }

    //  Implement TableColumnModelListener methods
    //  (Note: instead of implementing a listener you should be able to
    //  override the columnMarginChanged and columMoved methods of JTable)
    @Override
    public void columnMarginChanged(ChangeEvent e) {
        TableColumnModel tcm = table.getColumnModel();
        int columns = tcm.getColumnCount();

        for (int i = 0; i < columns; i++) {
            JTextField textField = (JTextField) filterRow.getComponent(i);
            Dimension d = textField.getPreferredSize();
            d.width = tcm.getColumn(i).getWidth();
            textField.setPreferredSize(d);
        }

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                filterRow.revalidate();
            }
        });
    }

    @Override
    public void columnMoved(TableColumnModelEvent e) {
        Component moved = filterRow.getComponent(e.getFromIndex());
        filterRow.remove(e.getFromIndex());
        filterRow.add(moved, e.getToIndex());
        filterRow.validate();
    }

    @Override
    public void columnAdded(TableColumnModelEvent e) {
    }

    @Override
    public void columnRemoved(TableColumnModelEvent e) {
    }

    @Override
    public void columnSelectionChanged(ListSelectionEvent e) {
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                TableFilterRow frame = new TableFilterRow();
            }
        });
    }
}