JTable Columns

[tan kian]

Hi all, does anyone know how to highlight columns when the column header is clicked?

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
 
public class HeaderHighlight extends MouseAdapter
{
    public void mousePressed(MouseEvent e)
    {
        JTableHeader header = (JTableHeader)e.getSource();
        int colIndex = header.columnAtPoint(e.getPoint());
        TableColumn col = header.getColumnModel().getColumn(colIndex);
        HighlightRenderer renderer = (HighlightRenderer)col.getCellRenderer();
        renderer.setSelectedColumn(colIndex);
        header.getTable().repaint();
    }
 
    private JTable getTable()
    {
        int rows = 32, cols = 3;
        String[] colNames = { "column 1", "column 2", "column 3" };
        Object[][] data = new Object[rows][cols];
        for(int row = 0; row < rows; row++)
            for(int col = 0; col < cols; col++)
                data[row][col] = "item " + (row*cols + col + 1);
        JTable table = new JTable(new DefaultTableModel(data, colNames));
        TableColumnModel colModel = table.getColumnModel();
        // use single instance of renderer for all columns
        HighlightRenderer renderer = new HighlightRenderer();
        for(int j = 0; j < table.getColumnCount(); j++)
        {
            TableColumn col = colModel.getColumn(j);
            col.setCellRenderer(renderer);
        }
        JTableHeader header = table.getTableHeader();
        header.addMouseListener(this);
        return table;
    }
 
    public static void main(String[] args)
    {
        HeaderHighlight test = new HeaderHighlight();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(test.getTable()));
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}
 
class HighlightRenderer extends DefaultTableCellRenderer
{
    int selectedColumn = -1;
 
    public Component getTableCellRendererComponent(JTable table,
                                                   Object value,
                                                   boolean isSelected,
                                                   boolean hasFocus,
                                                   int row, int column) 
    {
        // everything as usual
        super.getTableCellRendererComponent(table, value, isSelected,
                                            hasFocus, row, column);
        // added behavior
        if(column == selectedColumn)
            setBorder(BorderFactory.createLineBorder(Color.red));
        else
            setBorder(noFocusBorder);
        return this;
    }
 
    // set the column selection state
    public void setSelectedColumn(int selection)
    {
        if(selectedColumn == selection)    // toggle selection
            selectedColumn = -1;
        else
            selectedColumn = selection;    // change it
    }
}

edit: added noFocusBorder to renderer
[ April 25, 2006: Message edited by: Craig Wood ]

[tan kian]

thanks ^_^ i'll try it out and get back to u if i have any questions.

[tan kian]

i tried to do some stuff by myself, but i ran into some problems. i am using JTables to make an Excel-like spreadsheet. first, i cant highlight rows(when i click on the row header) after i put highlight(table) into the code. 2nd, i wanted it to work like this: highlight the entire row/column when i click on the respective header. however, the entire row/column will be highlighted no matter where i click in the table. can someone help? thanks.

public class FakeExcel extends Applet
{
   public void init()
   {   
  DefaultTableModel model = new DefaultTableModel(15,15);  
  JTable table = new JTable(model);  
 
  JTable table2 = new Mytable(table);
  JScrollPane sp = new JScrollPane(table);
  TableColumn tcol = null;
 
  highlightcols(table);
  table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);  
 
  // change column size here
  for(int i=0;i<15;i++)
  {
     tcol = table.getColumnModel().getColumn(i);
 tcol.setPreferredWidth(40);  
  }  
 
  sp.setRowHeaderView(table2);
 
  JFrame f = new JFrame("Test");
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.getContentPane().add(sp, BorderLayout.CENTER);
  f.setSize(655,305);
  f.setVisible(true);          
   }
   
public void highlightcols(JTable table) 
{
final JTable jt = table;
jt.setRowSelectionAllowed(true);
jt.setColumnSelectionAllowed(true);

MouseAdapter ma = new MouseAdapter() 
{
   public void mouseClicked(MouseEvent e) 
   {
      TableColumnModel columnModel = jt.getColumnModel();
      int viewcol = columnModel.getColumnIndexAtX(e.getX());
      int col = jt.convertColumnIndexToModel(viewcol);
      if (e.getClickCount() == 1 && col != -1) 
      {
         jt.setColumnSelectionInterval(col,col);
      }
   }
};

JTableHeader th = jt.getTableHeader();
th.addMouseListener(ma);
}     
}
 
//new original class for own table stuff
class Mytable extends JTable
{
   private JTable jt;
   
   public Mytable(JTable table)
   { 
  //custom table settings here
      super();
            
      jt = table;
      
      setAutoCreateColumnsFromModel(false);
      setModel(jt.getModel());
      setSelectionModel(jt.getSelectionModel());
      setAutoscrolls(false);
 
      //customise row headers here
      addColumn(new TableColumn());
      //set row header backgroound color      getColumnModel().getColumn(0).setCellRenderer(jt.getTableHeader().getDefaultRenderer());
      getColumnModel().getColumn(0).setPreferredWidth(40);
      setPreferredScrollableViewportSize(getPreferredSize());
      setIntercellSpacing(new Dimension(1,1));          
   }
   
   public Object getValueAt(int row, int column)
   {
  //displays numbers on row headers automatically
      return new Integer(row + 1);
   }     
}

[ April 26, 2006: Message edited by: Mr Hamtaro ]

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
 
public class CrossFire extends MouseAdapter
{
    public void mousePressed(MouseEvent e)
    {
        JTableHeader header = (JTableHeader)e.getSource();
        int colIndex = header.columnAtPoint(e.getPoint());
        TableColumn col = header.getColumnModel().getColumn(colIndex);
        HighlightRenderer renderer = (HighlightRenderer)col.getCellRenderer();
        renderer.setSelectedColumn(colIndex);
        header.getTable().repaint();
    }
 
    private JScrollPane getScrollPane()
    {
        DefaultTableModel model = new DefaultTableModel(15,15);
        JTable table = new JTable(model);
        table.setRowSelectionAllowed(true);
        table.setColumnSelectionAllowed(true);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        // use single instance of renderer for all columns
        HighlightRenderer renderer = new HighlightRenderer();
        // change column size here
        for(int i=0;i<15;i++)
        {
            TableColumn tcol = table.getColumnModel().getColumn(i);
            tcol.setPreferredWidth(40);
            tcol.setCellRenderer(renderer);
        }
        JTableHeader header = table.getTableHeader();
        header.addMouseListener(this);
 
        JTable left = new JTable()
        {
            //displays numbers on row headers automatically
            public Object getValueAt(int row, int column)
            {
                return new Integer(row + 1);
            }
        };
        left.setAutoCreateColumnsFromModel(false);
        left.setModel(table.getModel());
        left.setSelectionModel(table.getSelectionModel());
        left.setAutoscrolls(false);
        //customise row headers here
        left.addColumn(new TableColumn());
        //set row header backgroound color
        left.getColumnModel().getColumn(0).setCellRenderer(
                   table.getTableHeader().getDefaultRenderer());
        left.getColumnModel().getColumn(0).setPreferredWidth(40);
        left.setPreferredScrollableViewportSize(left.getPreferredSize());
        left.setIntercellSpacing(new Dimension(1,1));
        left.addMouseListener(new LeftListener(table));
        JScrollPane scrollPane = new JScrollPane(table);
        scrollPane.setRowHeaderView(left);
        return scrollPane;
    }
 
    private class LeftListener extends MouseAdapter
    {
        JTable table;
 
        public LeftListener(JTable table)
        {
            this.table = table;
        }
 
        public void mousePressed(MouseEvent e)
        {
            JTable left = (JTable)e.getSource();
            int rowIndex = left.rowAtPoint(e.getPoint());
            HighlightRenderer renderer =
                    (HighlightRenderer)table.getCellRenderer(rowIndex, 0);
            renderer.setSelectedRow(rowIndex);
            table.repaint();
        }
    }
 
    public static void main(String[] args)
    {
        CrossFire test = new CrossFire();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test.getScrollPane());
        f.setSize(655,305);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}
 
class HighlightRenderer extends DefaultTableCellRenderer
{
    int selectedColumn = -1;
    int selectedRow = -1;
 
    public Component getTableCellRendererComponent(JTable table,
                                                   Object value,
                                                   boolean isSelected,
                                                   boolean hasFocus,
                                                   int row, int column) 
    {
        super.getTableCellRendererComponent(table, value, isSelected,
                                            hasFocus, row, column);
        if(column == selectedColumn || row == selectedRow)
            setBorder(BorderFactory.createLineBorder(Color.red));
        else
            setBorder(noFocusBorder);
        return this;
    }
 
    public void setSelectedColumn(int selection)
    {
        if(selectedColumn == selection)
            selectedColumn = -1;
        else
            selectedColumn = selection;
    }
 
    public void setSelectedRow(int selection)
    {
        if(selectedRow == selection)
            selectedRow = -1;
        else
            selectedRow = selection;
    }
}

[tan kian]

thanks again Craig ^_^ i'll try your code and ask questions about anything i dont understand.

[tan kian]

here are the problems i ran into again. can someone help to explain why? anything i should be/should not be doing? thanks!!!

1)even if an entire column/row is been highlighted, choosing another cell does not make the highlighted column/row return to normal

public class Test extends Applet
{
   public void init()
   {   
  DefaultTableModel model = new DefaultTableModel(15,15);  
  JTable table = new JTable(model); 
  //new class for rows
  JTable table2 = new Mytable(table);
  JScrollPane sp = new JScrollPane(table);
  TableColumn tcol = null;
      Mycellrender mcr = new Mycellrender(); 
      JTableHeader colheader = table.getTableHeader();
      JTableHeader rowheader = table2.getTableHeader();
      
  table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
  
  // change column size here
  for(int i=0;i<15;i++)
  {
     tcol = table.getColumnModel().getColumn(i);
 tcol.setPreferredWidth(40);
 tcol.setCellRenderer(mcr);
  }  
  
  collistener cl = new collistener(table);
  colheader.addMouseListener(cl);
 
  sp.setRowHeaderView(table2);
 
  JFrame f = new JFrame("Test");
  f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  f.getContentPane().add(sp);
  f.setSize(655,305);
  f.setVisible(true);          
   } 
}
 
//new original class for own table stuff
class Mytable extends JTable
{
   private JTable jt;
   
   public Mytable(JTable table)
   { 
  //custom table settings here
      super();
      rowlistener rl = new rowlistener(table);                  
      jt = table;     
      
      setAutoCreateColumnsFromModel(false);
      setModel(jt.getModel());
      setSelectionModel(jt.getSelectionModel());
      setAutoscrolls(false); 
      //customise row headers here
      addColumn(new TableColumn());
      //set row header backgroound color
      getColumnModel().getColumn(0).setCellRenderer(jt.getTableHeader().getDefaultRenderer());
      getColumnModel().getColumn(0).setPreferredWidth(40);
      setPreferredScrollableViewportSize(getPreferredSize());
      setIntercellSpacing(new Dimension(1,1));      
      
      addMouseListener(rl);
   }
   
   public Object getValueAt(int row, int column)
   {
  //displays numbers on row headers automatically
      return new Integer(row + 1);
   }     
}
 
class collistener extends MouseAdapter
{
   JTable jt;
   
   public collistener(JTable table)
   {
      this.jt = table;
   }
   
   public void mousePressed(MouseEvent e)
   {
      JTableHeader header = jt.getTableHeader();         
      int cindex = header.columnAtPoint(e.getPoint());
      TableColumn tcol = header.getColumnModel().getColumn(cindex);
      Mycellrender mcr = (Mycellrender)tcol.getCellRenderer();
      
      mcr.setcol(cindex);
      header.getTable().repaint();
   }     
}
 
class rowlistener extends MouseAdapter
{
   JTable jt;
   
   public rowlistener(JTable table)
   {
      this.jt = table;
   }
   
   public void mousePressed(MouseEvent e)
   {
      JTable rows = jt;
      int rindex = rows.rowAtPoint(e.getPoint());
      TableColumn tcol = rows.getColumnModel().getColumn(rindex);
      Mycellrender mcr = (Mycellrender)tcol.getCellRenderer();
      
      mcr.setrow(rindex);
      jt.repaint();
   }  
}
 
class Mycellrender extends DefaultTableCellRenderer
{
   int selectcol = -1, selectrow = -1;
   
   public Component getTableCellRendererComponent(JTable jt,Object value,boolean isselected, boolean hasfocus,int row,int col)
   {
      super.getTableCellRendererComponent(jt,value,isselected,hasfocus,row,col);
      
      if (col == selectcol || row == selectrow || hasfocus == true)      
         setBackground(Color.lightGray);
      else
     setBackground(null);
      
      return this;
   }
   
   public void setcol(int index)
   {
      if (selectcol == index)
         selectcol = -1;     
      else
     selectcol = index;
   }
   
   public void setrow(int index)
   {
      if (selectrow == index)
         selectrow = -1;     
      else
     selectrow = index;
   }   
}  

[ April 29, 2006: Message edited by: Mr Hamtaro ]
[ April 29, 2006: Message edited by: Mr Hamtaro ]

[Craig Wood]

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
 
public class HighlightTest extends Applet
{ 
    public void init()
    { 
        DefaultTableModel model = new DefaultTableModel(15,15); 
        JTable table = new JTable(model); 
        table.setColumnSelectionAllowed(true);
        table.setRowSelectionAllowed(true);
        table.setCellSelectionEnabled(true);
        SelectionListener sl = new SelectionListener(table);
        table.getSelectionModel().addListSelectionListener(sl);
        table.getColumnModel().getSelectionModel().addListSelectionListener(sl);
        //new class for rows
        JTable table2 = new Mytable(table);
        JScrollPane sp = new JScrollPane(table);
        TableColumn tcol = null;
        Mycellrender mcr = new Mycellrender(); 
        JTableHeader colheader = table.getTableHeader();
//        JTableHeader rowheader = table2.getTableHeader();
 
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        // change column size here
        for(int i=0;i<15;i++)
        {
            tcol = table.getColumnModel().getColumn(i);
            tcol.setPreferredWidth(40); 
            tcol.setCellRenderer(mcr);
        } 
 
        collistener cl = new collistener(table);
        colheader.addMouseListener(cl);
        sp.setRowHeaderView(table2);
        setLayout(new BorderLayout());
        add(sp);
    }
 
    public static void main(String[] args)
    {
        Applet applet = new HighlightTest();
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(applet);
        f.setSize(655,305);
        applet.init();
        f.setVisible(true); 
    } 
}
 
//new original class for own table stuff
class Mytable extends JTable
{
    public Mytable(JTable table)
    { 
        //custom table settings here
        super();
 
        setAutoCreateColumnsFromModel(false);
        setModel(table.getModel());
//        setSelectionModel(jt.getSelectionModel());
        setAutoscrolls(false); 
        //customise row headers here
        addColumn(new TableColumn());
        //set row header backgroound color
        getColumnModel().getColumn(0).setCellRenderer(
                     table.getTableHeader().getDefaultRenderer());
        getColumnModel().getColumn(0).setPreferredWidth(40);
        setPreferredScrollableViewportSize(getPreferredSize());
        setIntercellSpacing(new Dimension(1,1)); 
 
        rowlistener rl = new rowlistener(table);
        addMouseListener(rl);
    }
 
    public Object getValueAt(int row, int column)
    {
        //displays numbers on row headers automatically
        return new Integer(row + 1);
    } 
}
 
class collistener extends MouseAdapter
{
    JTable jt;
 
    public collistener(JTable table)
    {
        this.jt = table;
    }
 
    public void mousePressed(MouseEvent e)
    {
        JTableHeader header = jt.getTableHeader(); 
        int cindex = header.columnAtPoint(e.getPoint());
        TableColumn tcol = header.getColumnModel().getColumn(cindex);
        Mycellrender mcr = (Mycellrender)tcol.getCellRenderer();
 
        mcr.setcol(cindex);
        jt.repaint();
    } 
}
 
class rowlistener extends MouseAdapter
{
    JTable mainTable;
 
    public rowlistener(JTable table)
    {
        mainTable = table;
    }
 
    public void mousePressed(MouseEvent e)
    {
        JTable rows = (JTable)e.getSource();
        int rindex = rows.rowAtPoint(e.getPoint());
        Mycellrender mcr = (Mycellrender)mainTable.getCellRenderer(rindex, 0);
 
        mcr.setrow(rindex);
        mainTable.repaint();
    } 
}
 
class Mycellrender extends DefaultTableCellRenderer
{
    int selectcol = -1, selectrow = -1;
 
    public Component getTableCellRendererComponent(JTable jt,Object value,
                          boolean isselected, boolean hasfocus,int row,int col)
    {
        super.getTableCellRendererComponent(jt,value,isselected,hasfocus,row,col);
 
        if (col == selectcol || row == selectrow) 
            setBackground(Color.lightGray);
        else if(isselected)
            setBackground(jt.getSelectionBackground());
        else
            setBackground(null);
 
        return this;
    }
 
    public void setcol(int index)
    {
        if (selectcol == index)
            selectcol = -1; 
        else
            selectcol = index;
    }
 
    public void setrow(int index)
    {
        if (selectrow == index)
            selectrow = -1; 
        else
            selectrow = index;
    }
}
 
class SelectionListener implements ListSelectionListener
{
    JTable table;
 
    public SelectionListener(JTable t) { table = t; }
 
    public void valueChanged(ListSelectionEvent e)
    {
        if(!e.getValueIsAdjusting())
        {
            ListSelectionModel model = (ListSelectionModel)e.getSource();
            Mycellrender mcr = (Mycellrender)table.getCellRenderer(0,0);
            int anchorRowIndex = table.getSelectionModel().getAnchorSelectionIndex();
            int anchorColIndex = table.getColumnModel().getSelectionModel().
                                          getAnchorSelectionIndex();
            boolean change = false;
            if(anchorRowIndex != mcr.selectrow)
            {
                mcr.setrow(mcr.selectrow);
                change = true;
            }
            if(anchorColIndex != mcr.selectcol)
            {
                mcr.setcol(mcr.selectcol);
                change = true;
            }
            if(change)
                table.repaint();
        }
    }
}

[tan kian]

thanks Craig, u've been a great help =)

[Jeff Albertson]

"Mr Hamtaro":



I'm suprised you haven't been called on your name!

[tan kian]

lol well maybe because pple who post here are not here to relax? they come here looking for help and codes

[Jeff Albertson]

Originally posted by Mr Hamtaro:
lol well maybe because pple who post here are not here to relax? they come here looking for help and codes

I am just referring to this site's naming policy.

[tan kian]

oh sorry i didnt know that. i'll change my name then.

[Jeff Albertson]

You can still use hamtaro for a profile picture (check out my profile)
[ May 03, 2006: Message edited by: Jeff Albertson ]