Issue with Jcheckbox on JTableheader

ram_76uk · #1 (**permalink**) 07-29-2008, 11:57 PM

Hello ,

I have used below code to add checkboxes on Jtableheader.In my table i can resize column width(resize).I feel that is the problem.

HTML Code:

package com.ibm.report;
 
import java.awt.event.ItemListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.Component;
 
import javax.swing.JCheckBox;
import javax.swing.JTable;
import javax.swing.UIManager;
//import javax.swing.ImageIcon;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;
 
 
/**
  * Add a JCheckBox to the Renderer
  * @author Jan-Friedrich Mutter (jmutter@bigfoot.de)
  */
public class CheckBoxHeader extends JCheckBox implements TableCellRenderer, MouseListener {
 
  /**
    * the Renderer Component.
    * @see #getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
    */
  protected CheckBoxHeader rendererComponent;
 
  /** To which (JTable-) columns does this Checkbox belong ? */
  protected int column;
 
  /**
    * remembers, if mousePressed() was called before.
    * Workaround, because dozens of mouseevents occurs after one
    * mouseclick.
    */
  protected boolean mousePressed = false;
 
  /**
    * @param itemListener will be notified when Checkbox will be checked/unchecked
    */
  public CheckBoxHeader(ItemListener itemListener) {
	  
    rendererComponent = this;
    rendererComponent.addItemListener(itemListener);
    
  }
 
  /** @return this */
  //pasted from javax.swing.table.TableColumn.createDefaultHeaderRenderer()
  //with some slight modifications.
  //implements TableCellRenderer
  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((value == null) ? "" : value.toString());
		setBorder(UIManager.getBorder("TableHeader.cellBorder"));
 
    return rendererComponent;
  }
 
  /** @param column to which the CheckBox belongs to */
  protected void setColumn(int column) {
    this.column = column;
  }
 
  /** @return the column to which the CheckBox belongs to */
  public int getColumn() {
    return column;
  }
 
  /**************** Implementation of MouseListener ******************/
 
  /**
    * Calls doClick(), because the CheckBox doesn't receive any
    * mouseevents itself. (because it is in a CellRendererPane).
    */
  protected void handleClickEvent(MouseEvent e) {
    // Workaround: dozens of mouseevents occur for only one mouse click.
    // First MousePressedEvents, then MouseReleasedEvents, (then
    // MouseClickedEvents).
    // The boolean flag 'mousePressed' is set to make sure
    // that the action is performed only once.
    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);
    //Header doesn't repaint itself properly
    ((JTableHeader)e.getSource()).repaint();
  }
 
  public void mousePressed(MouseEvent e) {
    mousePressed = true;
  }
 
  public void mouseReleased(MouseEvent e) {
    //works - problem: works even if column is dragged or resized ...
    //handleClickEvent(e);
    //properly repainting by the Header
  }
 
  public void mouseEntered(MouseEvent e) {
  }
 
  public void mouseExited(MouseEvent e) {
  }
}

This code is working fine as long as i am not resizing the column width.Even if i resize the column width slowly for few times ,its working fine.But if i resize bit faster many times i am seeing below error message.

Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEven tMulticaster.java:263)

Could you please let me know how to avoid this ,if you come accross such problem please.

Thanks in advance...

hardwired · #2 (**permalink**) 07-30-2008, 07:19 AM

See comments for why this happens, how to avoid it and, better yet, how to do it properly in swing/java.

Code:

import java.awt.event.ItemListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.Component;
 
import javax.swing.JCheckBox;
import javax.swing.JTable;
import javax.swing.UIManager;
//import javax.swing.ImageIcon;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;

import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*; 
 
/**
  * Add a JCheckBox to the Renderer
  * @author Jan-Friedrich Mutter (jmutter@bigfoot.de)
  */
public class CBH extends JCheckBox implements TableCellRenderer, MouseListener {
 
  /**
    * the Renderer Component.
    * @see #getTableCellRendererComponent(JTable table, Object value,
    *             boolean isSelected, boolean hasFocus, int row, int column)
    */
  protected CBH rendererComponent;
 
  /** To which (JTable-) columns does this Checkbox belong ? */
  protected int column;
 
  /**
    * remembers, if mousePressed() was called before.
    * Workaround, because dozens of mouseevents occurs after one
    * mouseclick.
    */
  protected boolean mousePressed = false;
 
  /**
    * @param itemListener will be notified when Checkbox will be 

checked/unchecked
    */
  public CBH(ItemListener itemListener) {
	  
    rendererComponent = this;
    rendererComponent.addItemListener(itemListener);
    
  }
 
  /** @return this */
  //pasted from javax.swing.table.TableColumn.createDefaultHeaderRenderer()
  //with some slight modifications.
  //implements TableCellRenderer
  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());
 
            // We only need one listener on the header
            // this adds another every time this renderer
            // is fetched to render a column header which
            // can eventually lead to StackOverflowError.
            header.addMouseListener(rendererComponent);
      }
    }
 
    setColumn(column);
    rendererComponent.setText((value == null) ? "" : value.toString());
		setBorder(UIManager.getBorder("TableHeader.cellBorder"));
 
    return rendererComponent;
  }
 
  /** @param column to which the CheckBox belongs to */
  protected void setColumn(int column) {
    this.column = column;
  }
 
  /** @return the column to which the CheckBox belongs to */
  public int getColumn() {
    return column;
  }
 
  /**************** Implementation of MouseListener ******************/
 
  /**
    * Calls doClick(), because the CheckBox doesn't receive any
    * mouseevents itself. (because it is in a CellRendererPane).
    * The way to get the JCheckBox to work is to create and
    * install an editor that looks, ie, is configured just like
    * this renderer.
    */
  protected void handleClickEvent(MouseEvent e) {
    // Workaround: dozens of mouseevents occur for only one mouse click.
    // First MousePressedEvents, then MouseReleasedEvents, (then
    // MouseClickedEvents).
    // The boolean flag 'mousePressed' is set to make sure
    // that the action is performed only once.
    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);
    //Header doesn't repaint itself properly
    // If I comment out the line
    // header.addMouseListener(rendererComponent);
    // in the getTableCellRendererComponent
    // method above the header seems to repaint
    // itself okay for mouseDrags/moving/resizing.
    ((JTableHeader)e.getSource()).repaint();
  }
 
  public void mousePressed(MouseEvent e) {
    mousePressed = true;
    // How many MouseListeners are being notified for this event?
    JTableHeader header = (JTableHeader)e.getSource();
    MouseListener[] mls = header.getListeners(MouseListener.class);
    System.out.printf("TableHeader has %d MouseListeners added to it%n",
                       mls.length);
  }
 
  public void mouseReleased(MouseEvent e) {
    //works - problem: works even if column is dragged or resized ...
    //handleClickEvent(e);
    //properly repainting by the Header
  }
 
  public void mouseEntered(MouseEvent e) {
  }
 
  public void mouseExited(MouseEvent e) {
  }

    public static void main(String[] args) {
        JTable table = new JTable(getTableModel());
        TableColumnModel model = table.getColumnModel();
        for(int i = 0; i < 2; i++) {
            TableColumn col = model.getColumn(i);
            col.setHeaderRenderer(new CBH(il));
            // an option
            //col.setPreferredWidth(25);
            //col.setResizable(false);
        }
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new JScrollPane(table));
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
    
    private static AbstractTableModel getTableModel() {
        return new AbstractTableModel() {
            public int getRowCount() { return 10; }

            public int getColumnCount() { return 4; }

            public Object getValueAt(int row, int col) {
                return String.valueOf((row+1)) + (col+1);
            }
        };
    }

    private static ItemListener il = new ItemListener() {
        public void itemStateChanged(ItemEvent e) {
            System.out.println("itemListener");
        }
    };
}

ram_76uk · #3 (**permalink**) 07-30-2008, 10:24 AM

Hi Thanks for your valuable suggestions.I have modified the code as per your suggestions,now functionality is working great as per client requirements.

Only thing i did was i restricted in code to add mouse listener as below in getTableCellRendererComponent(...).If we add action listener only once to table header , i am able check/uncheck checkbox only in the first column of the table.So i have added for all the columns by checking table columns length.

HTML Code:

MouseListener[] mls = (MouseListener[])header.getListeners(MouseListener.class);
if(mls.length < table.getColumnCount()){
             header.addMouseListener(rendererComponent);
}