Checkbox editor for JTable column

[ShamPhadtale]

I have written checkbox editor for JTable column. I am able to see checkbox and can select or deselect it. But if I select row 1 checkbox and then if click on row 2 checkbox, the selected checkbox of row 1 disappers, it becomes false again. That is I can select only one checkbox. I am not getting what i written wrong in editor. Or what is my propable mistake. Please someone can help me.

import java.awt.Color;   
import java.awt.Component;   
import java.awt.event.ItemEvent;   
import java.awt.event.ItemListener;   
import java.util.EventObject;   
  
import javax.swing.DefaultCellEditor;   
import javax.swing.JCheckBox;   
import javax.swing.JTable;   
import javax.swing.SwingConstants;   
import javax.swing.event.CellEditorListener;   
  
/*  
 * can extends AbstractCellEditor  
 */  
  
public class GenTableCellEditor extends DefaultCellEditor implements ItemListener {   
       
    protected static JCheckBox checkBox = new JCheckBox();   
  
    public GenTableCellEditor() {   
        super(checkBox);   
        checkBox.setHorizontalAlignment(SwingConstants.CENTER);   
        checkBox.setBackground(Color.white);   
    }   
  
    public Component getTableCellEditorComponent(JTable table, Object value,   
            boolean isSelected, int row, int column) {   
        if (value == null)   
            return checkBox;   
        checkBox.addItemListener(this);   
        if (((Boolean) value).booleanValue())   
            checkBox.setSelected(true);   
        else  
            checkBox.setSelected(false);   
  
        return checkBox;   
    }   
  
    public Object getCellEditorValue() {   
        if(checkBox.isSelected() == true)   
            return new Boolean(true);   
        else    
            return new Boolean(false);   
    }   
  
    @Override  
    public void addCellEditorListener(CellEditorListener l) {   
        // TODO Auto-generated method stub   
    }   
  
    @Override  
    public void cancelCellEditing() {   
        // TODO Auto-generated method stub   
  
    }   
  
    @Override  
    public boolean isCellEditable(EventObject anEvent) {   
        // TODO Auto-generated method stub   
        return true;   
    }   
  
    @Override  
    public void removeCellEditorListener(CellEditorListener l) {   
        // TODO Auto-generated method stub   
  
    }   
  
    @Override  
    public boolean shouldSelectCell(EventObject anEvent) {   
        // TODO Auto-generated method stub   
        return true;   
    }   
  
    @Override  
    public boolean stopCellEditing() {   
        // TODO Auto-generated method stub   
        return true;   
    }   
  
    @Override  
    public void itemStateChanged(ItemEvent e) {   
        // TODO Auto-generated method stub   
        System.out.println("Firing!");   
    }   
}

[Fubarable]

Why are you even trying to create a checkbox editor? Why not just override the model and have it's getColumnClass() return Boolean.class for the column that needs checkboxes?

[ShamPhadtale]

I tried it. But it shows only checkboxes not allowing seletion to them. I am not able to check it. I also override isCellEditable() method but still not able to check the checkbox.

[Fubarable]

I tried it. But it shows only checkboxes not allowing seletion to them. I am not able to check it. I also override isCellEditable() method but still not able to check the checkbox.

They should be selectable unless the cell is not editable. I think you should post a small compilable program showing this attempt above, an SSCCE.

[ShamPhadtale]

Ok. actualy I have lot of legacy code. So I will try to write a sample code within an hour.

[ShamPhadtale]

Sorry to say but writting sample program will take too much time. I am just pasting table model which I am using. Please give me hint if possible from below model. I will definitely paste whole sample program SSCCE tomorrow.

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Vector;

import javax.swing.table.AbstractTableModel;

public class TableModel1 extends AbstractTableModel {
	
	private ColumnProperties[] colprops;    // it contain data type column class name and some more colum properties
	private String columnNames[];
	private HashMap _data = new HashMap();
	protected int columnsCount = 0;
	
	public TableModel1(ColumnProperties[] colProps) {
		this.colprops = colProps;
		this.columnsCount = colProps.length;
		setColumnProperties();
	}

	public void setColumnProperties() {
		columnNames = new String[colprops.length];
		for (int i = 0; i < columnNames.length; i++) {
			columnNames[i] = colprops[i].getColumnName();
		}
	}
	
	public boolean isCellEditable(int rowIndex, int columnIndex) {
		if(getColumnName(columnIndex).equalsIgnoreCase("Mask")){
			return true;
		}
		return false;
	}
	
	public void clear() {
		_data.clear();
		fireTableDataChanged();
	}

	public int getRowCount() {
		if (_data.size() == 0)
			return 0;
		else
			return  _data.size();
	}
	public int getColumnCount() {
		return colprops.length;
	}

	public Object getValueAt(int row, int col) {
		List myList = new ArrayList(_data.keySet());
		Vector finRec = (Vector) _data.get(myList.get(row));
		return finRec.elementAt(col);
	}
	
	public String getColumnName(int col) {
		return colprops[col].getColumnName();
	}
	@Override
	public Class getColumnClass(int column) {
		if (colprops[column] != null) {
			return colprops[column].getClassPARM();
		}
		return String.class;
	}

	@SuppressWarnings("unchecked")
	public void setValueAt(Object value, int row, int col) {
		try {
			Vector<Object> a = (Vector) _data.get(row);
			a.setElementAt(value, col);
			// _data[row][col] = value;
			fireTableCellUpdated(row, col);
		} catch (Exception e) {
		}
	}

	public ColumnProperties[] getColprops() {
		return colprops;
	}

	public void setColprops(ColumnProperties[] colprops) {
		this.colprops = colprops;
	}

	public HashMap getData() {
		return _data;
	}

	public void remove(Object key) {
		_data.remove(key);
		fireTableDataChanged();
	}

	public void setData(Object key, Vector data) {
		this._data.put(key, data);
		fireTableDataChanged();
	}
}

[Fubarable]

Sorry to say but writting sample program will take too much time. I am just pasting table model which I am using. Please give me hint if possible from below model. I will definitely paste whole sample program SSCCE tomorrow.

If you still need our help tomorrow, I'll wait for your SSCCE. Otherwise and again, fix your getColumnClass and isCellEditable methods above.

Best of luck!

[ShamPhadtale]

I am still facing problem. One thing I noticed that itemStateChanged method was getting call again and again. So I moved checkBox.addItemListener(this); line from getTableCellEditorComponent() to Constructor. Now itemStateChanged method gets call only twice. Still not able to select multiple checkbox, only one checkbox is get allowed

I checked by debugging getColumnClass and isCellEditable methods are working correctly, they are returning correct values on cell selection. So i think I need to add some code to other methods like shouldSelectCell, stopCellEditing etc. But I am not aware what exactly they do. I will find out what exactly i need to do.
I also tried of using -

					columnModel.getColumn(i).setCellEditor(genTable.getDefaultEditor(Boolean.class));
					columnModel.getColumn(i).setCellRenderer(genTable.getDefaultRenderer(Boolean.class));

but it also not worked.

[ShamPhadtale]

I am not getting why itemStateChanged() and stopCellEditing() methods are getting call twice?

[camickr]

columnModel.getColumn(i).setCellEditor(genTable.getDefaultEditor(Boolean.class)); 
columnModel.getColumn(i).setCellRenderer(genTable.getDefaultRenderer(Boolean.class));

There is no need to create a custom editor. JTable provides a default checkbox editor.

I am not getting why you haven't posted a SSCCE yet? We can't help you otherwise. I have no idea why you are even using an ItemListener.

[camickr]

Cross posted: Checkbox editor for JTable column (Swing / AWT / SWT / JFace forum at JavaRanch)

[ShamPhadtale]

To get help early I had posted same question on Javranch as well. From next time I will take care of letting know members that I have posted questions on different forums. I am appologize for my mistake.
I am trying to use ItemListener, since after selecting checkbox I need to do some changes to server side and I was planning to call these changes from ItemStateChange method of ItemListener. Is it incorrect to do such thing? What should be right way to capture state change event of CheckBox in JTable column?

[camickr]

You would use a TableModelListener.