Java Tutorial/Swing/JTableHeader

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Creating a Custom Column Header Renderer in a JTable Component

   <source lang="java">

import java.awt.ruponent; import javax.swing.JLabel; import javax.swing.JTable; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; public class Main { 

 public static void main(String[] argv) throws Exception {
   JTable table = new JTable();
   int vColIndex = 0;
   TableColumn col = table.getColumnModel().getColumn(vColIndex);
   col.setHeaderRenderer(new MyTableHeaderRenderer());
 }

} class MyTableHeaderRenderer extends JLabel implements TableCellRenderer { 

 public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
     boolean hasFocus, int rowIndex, int vColIndex) {
   setText(value.toString());
   setToolTipText((String) value);
   return this;
 }

}</source>





Customizing a JTableHeader Look and Feel

Property StringObject TypeTableHeader.backgroundColorTableHeader.cellBorderBorderTableHeader.fontFontTableHeader.foregroundColorTableHeaderUIString


Customizing Column Headers with Icons

   <source lang="java">

import java.awt.BorderLayout; import java.awt.ruponent; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.UIManager; import javax.swing.border.Border; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; import javax.swing.table.TableColumnModel; class JComponentTableCellRenderer implements TableCellRenderer { 

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

} public class LabelHeaderSample { 

 public static void main(String args[]) {
   final Object rows[][] = { { "one", "1" }, { "two", "2" }, { "three", "3" } };
   JFrame frame = new JFrame("Label Header");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   String headers[] = { "English", "#" };
   JTable table = new JTable(rows, headers);
   JScrollPane scrollPane = new JScrollPane(table);
   Icon redIcon = new ImageIcon("yourFile.gif");
   Icon blueIcon = new ImageIcon("yourFile.gif");
   Border headerBorder = UIManager.getBorder("TableHeader.cellBorder");
   JLabel blueLabel = new JLabel(headers[0], blueIcon, JLabel.CENTER);
   blueLabel.setBorder(headerBorder);
   JLabel redLabel = new JLabel(headers[1], redIcon, JLabel.CENTER);
   redLabel.setBorder(headerBorder);
   TableCellRenderer renderer = new JComponentTableCellRenderer();
   TableColumnModel columnModel = table.getColumnModel();
   TableColumn column0 = columnModel.getColumn(0);
   TableColumn column1 = columnModel.getColumn(1);
   column0.setHeaderRenderer(renderer);
   column0.setHeaderValue(blueLabel);
   column1.setHeaderRenderer(renderer);
   column1.setHeaderValue(redLabel);
   frame.add(scrollPane, BorderLayout.CENTER);
   frame.setSize(300, 150);
   frame.setVisible(true);
 }

}</source>





Hiding column headers: table.setTableHeader(null);

   <source lang="java">

import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; public class NullColumnHeader { 

 public static void main(String args[]) {
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Object rowData[][] = { { "Row1-Column1", "Row1-Column2", "Row1-Column3" },
       { "Row2-Column1", "Row2-Column2", "Row2-Column3" } };
   Object columnNames[] = { "1", "2", "3" };
   JTable table = new JTable(rowData, columnNames);
   JScrollPane scrollPane = new JScrollPane(table);
   table.setTableHeader(null);
   
   frame.add(scrollPane, BorderLayout.CENTER);
   frame.setSize(300, 150);
   frame.setVisible(true);
 }

}</source>



You could also remove headers by subclassing JTable and overriding the protected configureEnclosingScrollPane() method, or by telling every TableColumn that its header value is empty.


Implementing Variable-Height Column Headers in a JTable Component

   <source lang="java">

import java.awt.ruponent; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JLabel; import javax.swing.JTable; import javax.swing.UIManager; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; import javax.swing.table.JTableHeader; public class Main { 

 public static void main(String[] argv) throws Exception {
   DefaultTableModel model = new DefaultTableModel();
   JTable table = new JTable(model);
   model.addColumn("Col1");
   model.addColumn("Icon Here");
   table.getColumnModel().getColumn(0).setHeaderValue(new ImageIcon("image.gif"));
   table.getColumnModel().getColumn(0).setHeaderRenderer(new IconHeaderRenderer());
 }

} class IconHeaderRenderer extends DefaultTableCellRenderer { 

 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) {
       setForeground(header.getForeground());
       setBackground(header.getBackground());
       setFont(header.getFont());
     }
   }
   if (value instanceof Icon) {
     setIcon((Icon) value);
     setText("");
   } else {
     setText((value == null) ? "" : value.toString());
     setIcon(null);
   }
   setBorder(UIManager.getBorder("TableHeader.cellBorder"));
   setHorizontalAlignment(JLabel.CENTER);
   return this;
 }

}</source>





Listening for Clicks on a Column Header in a JTable Component

   <source lang="java">

import java.awt.Rectangle; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JTable; import javax.swing.table.JTableHeader; import javax.swing.table.TableColumnModel; public class Main { 

 public static void main(String[] argv) throws Exception {
   JTable table = new JTable(5, 5);
   JTableHeader header = table.getTableHeader();
   header.addMouseListener(new ColumnHeaderListener());
 }

} class ColumnHeaderListener extends MouseAdapter { 

 public void mouseClicked(MouseEvent evt) {
   JTable table = ((JTableHeader) evt.getSource()).getTable();
   TableColumnModel colModel = table.getColumnModel();
   int index = colModel.getColumnIndexAtX(evt.getX());
   if (index == -1) {
     return;
   }
   Rectangle headerRect = table.getTableHeader().getHeaderRect(index);
   if (index == 0) {
     headerRect.width -= 10;
   } else {
     headerRect.grow(-10, 0);
   }
   if (!headerRect.contains(evt.getX(), evt.getY())) {
     int vLeftColIndex = index;
     if (evt.getX() < headerRect.x) {
       vLeftColIndex--;
     }
   }
 }

}</source>





Removing Column Headers: provide empty strings as the column header names.

   <source lang="java">

import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; public class EmptyColumnHeader { 

 public static void main(String args[]) {
   JFrame frame = new JFrame();
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Object rowData[][] = { { "Row1-Column1", "Row1-Column2", "Row1-Column3" },
       { "Row2-Column1", "Row2-Column2", "Row2-Column3" } };
   Object columnNames[] = { "", "", "" };
   JTable table = new JTable(rowData, columnNames);
   JScrollPane scrollPane = new JScrollPane(table);
   frame.add(scrollPane, BorderLayout.CENTER);
   frame.setSize(300, 150);
   frame.setVisible(true);
 }

}</source>





Removing the Column Headers from a Scrollable in a JTable Component

   <source lang="java">

import javax.swing.JTable; public class Main { 

 public static void main(String[] argv) throws Exception {
   JTable table = new JTable();
   // Remove the column headers
   table.setTableHeader(null);
 }

}</source>





Setting Column Header Tool Tips in a JTable Components

   <source lang="java">

import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.util.HashMap; import java.util.Map; import javax.swing.JTable; import javax.swing.table.JTableHeader; import javax.swing.table.TableColumn; import javax.swing.table.TableColumnModel; public class Main { 

 public static void main(String[] argv) throws Exception {
   int rows = 10;
   int cols = 5;
   JTable table = new JTable(rows, cols);
   JTableHeader header = table.getTableHeader();
   ColumnHeaderToolTips tips = new ColumnHeaderToolTips();
   for (int c = 0; c < table.getColumnCount(); c++) {
     TableColumn col = table.getColumnModel().getColumn(c);
     tips.setToolTip(col, "Col " + c);
   }
   header.addMouseMotionListener(tips);
 }

} class ColumnHeaderToolTips extends MouseMotionAdapter { 

 TableColumn curCol;
 Map tips = new HashMap();
 public void setToolTip(TableColumn col, String tooltip) {
   if (tooltip == null) {
     tips.remove(col);
   } else {
     tips.put(col, tooltip);
   }
 }
 public void mouseMoved(MouseEvent evt) {
   JTableHeader header = (JTableHeader) evt.getSource();
   JTable table = header.getTable();
   TableColumnModel colModel = table.getColumnModel();
   int vColIndex = colModel.getColumnIndexAtX(evt.getX());
   TableColumn col = null;
   if (vColIndex >= 0) {
     col = colModel.getColumn(vColIndex);
   }
   if (col != curCol) {
     header.setToolTipText((String) tips.get(col));
     curCol = col;
   }
 }

}</source>





Showing the Table Header in a Non-Scrollable JTable Component

   <source lang="java">

import java.awt.BorderLayout; import javax.swing.JPanel; import javax.swing.JTable; import javax.swing.table.JTableHeader; public class Main { 

 public static void main(String[] argv) throws Exception {
   int rows = 10;
   int cols = 5;
   JTable table = new JTable(rows, cols);
   JTableHeader header = table.getTableHeader();
   JPanel container = new JPanel(new BorderLayout());
   // Add header in NORTH slot
   container.add(header, BorderLayout.NORTH);
   // Add table itself to CENTER slot
   container.add(table, BorderLayout.CENTER);
 }

}</source>





Using Tooltips in Table Headers: Showing Tooltip Text in a Table Header

   <source lang="java">

import java.awt.BorderLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; import javax.swing.table.TableColumnModel; public class LabelHeaderSample { 

 public static void main(String args[]) {
   final Object rows[][] = { { "one", "1" }, { "two", "2" }, { "three", "3" } };
   JFrame frame = new JFrame("Label Header");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
   String headers[] = { "English", "#" };
   JTable table = new JTable(rows, headers);
   JScrollPane scrollPane = new JScrollPane(table);
   JLabel headerRenderer = new DefaultTableCellRenderer();
   String columnName = table.getModel().getColumnName(0);
   headerRenderer.setText(columnName);
   headerRenderer.setToolTipText("text");
   TableColumnModel columnModel = table.getColumnModel();
   TableColumn englishColumn = columnModel.getColumn(0);
   englishColumn.setHeaderRenderer((TableCellRenderer)headerRenderer);
   
   frame.add(scrollPane, BorderLayout.CENTER);
   frame.setSize(300, 150);
   frame.setVisible(true);
 }

}</source>


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