ComboBox ina JXTable

[testeurforme]

Hello

In first , excuse me for my english...
I'm a newbee in Java but I would like to find a solution for this problem :
I would like to put a JCombobox in one cell of a JXtable
exemple :

the cell (0,0) contains a name of a town , and the cell (0,1) contain a JComboBox with the list of the borough.

If somebody could help me ...
thanks

[mabuhay]

Hi

I think I have the same problem. I have several different ComboBoxes. I want to define them like
JComboBox cb1 = new JComboBox()
JComboBox cb2 = new JComboBox()
....
and then add them to the table,
for column1/row1 cb1,
for column1/row2 cb2
...and so on.

The solutions I found so far is to set one ant the same ComboBox for the entire column with getColumnModel and setCellEditor. But I want to have different ComboBoxes for different cells.

Another solution is create my own TableCellEditor (example at http://www.java2s.com/Code/Java/Swin...ndcomobobx.htm)... but I am not so sure how to make it work and if its really the right approach...

Does anyone has a easy example or is it really so complicated to place an object in a specific table cell?

hope someone can help us
thanks

[testeurforme]

hello,

I implement this code :

  
        MyDefaultTableCellRenderer cellRendererTown = new MyDefaultTableCellRenderer();
        final MyDefaultTableCellEditor cellEditorTown= new MyDefaultTableCellEditor();
     
   //I create un ActionListener on my combo because, the methode getCellEditorValue is executed only when the combo lost the focus, not when a value is selected!
        cellEditorProfil.getCombo().addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
               Town town = (StudyGeneric) JXTableListHelper.getSelectedRowValue(table);
               setBorough(cellEditorProfil.getCombo().getSelectedItem());
            }
        });

        table.getColumnExt(3).setCellEditor(cellEditorTown);
        table.getColumnExt(3).setCellRenderer(cellRendererTown);


public class MyDefaultTableCellEditor extends AbstractCellEditor implements TableCellEditor {
        JComboBox combo;

        public MyDefaultTableCellEditor() {
            super();
            combo = new JComboBox(new ComboBoxListModel());
            combo.setRenderer(new ComboBoxMapRenderer());
        }

        public Object getCellEditorValue() {
            return combo.getSelectedItem();
        }

        public Component getTableCellEditorComponent(JTable tableau, Object value, boolean isSelected, int row, int column) {
            Town town = (Town) value;
             
         //this line is necessary because the selection of the combo not select the line of my table
            // --> actionEvent of combo crash when I recup the Line selected of the table
            JXTableListHelper.setSelectedRow(table, town);
           
            if (column == 3) {
                updating the liste of the borough in my combo (depend of the town)
                updateLstBoroughItems(combo, town);
                return combo;
            }
        }

        public JComboBox getCombo() {
            return combo;
        }
    }

    public class MyDefaultTableCellRenderer extends DefaultTableRenderer {
        JComboBox combo;

        public MyDefaultTableCellRenderer() {
            super();
            combo = new JComboBox(new ComboBoxListModel());
            combo.setRenderer(new ComboBoxMapRenderer());
        }

        public JComboBox getCombo() {
            return combo;
        }

        public Component getTableCellRendererComponent(JTable jTable, Object object, boolean b, boolean b1, int row, int col) {
            Town town= (Townobject;
             if (col == 3) {
                updateLstBoroughItems(combo, study);
                return combo;
             } 
        }
    }

But I don't know if it's the good methode ! I have another little probleme in one case : If you want to do a control of the valule selected in the combo , if I use the methode cancelCellEditing of the cellEditor, I lost my old value ...
I found a solution (good ??) :

     cellEditorProfil.getCombo().addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent e) {
               Town town = (StudyGeneric)  JXTableListHelper.getSelectedRowValue(table);
               if(!setBrough(cellEditorProfil.getCombo().getSelectedItem())){
                  //if the control is not good the value of the borough is not  updated in my persistent model , so I 'm updating the combo                   cellEditorFonction.getCombo().getModel().setSelectedItem(getBrough(town);
               }
            }
        });

a+

[mabuhay]

Thanks @testeurforme, your example helped me to fix my problem. Here's how I did it.
With this code, I can add objects to the table and access them without looping through the table.

		JTable table = new JTable(tableModel);
		DefaultTableModel tableModel = new MyTableModel();
		table.getColumn("AColumnTitle").setCellEditor(new MyTableCellEditor(table.getRowCount(), table.getColumnCount()));

MyTableCellEditor sets the ComboBox and CheckBox objects and handles the displayed value:

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

public class MyTableCellEditor extends AbstractCellEditor implements TableCellEditor {
	static final long serialVersionUID = 2;
	DefaultCellEditor[][] cellEditors;
	int row;
	int column;
	
	public MyTableCellEditor(int rows, int columns) {
		this.cellEditors = new DefaultCellEditor[rows][columns];

		//Define the editors row by row
		for ( int setRow = 0; setRow < rows; setRow++ ) {
			for ( int setColumn = 0; setColumn < columns; setColumn++ ) {
				if ( setColumn == 1 ) {
					//Set a combo box
					cellEditors[setRow][setColumn] = new DefaultCellEditor(A_JCOMBO_BOX);
				} else if ( setColumn == 4 ) {
					//Align the checkbox
					A_JCHECK_BOX.setHorizontalAlignment(JCheckBox.CENTER);
					//Set the check box
					cellEditors[setRow][setColumn] = new DefaultCellEditor(A_JCHECK_BOX);
				} else {
					cellEditors[setRow][setColumn] = null;
				}
			}
			
		}
		
		
	}
	
	

	public Component getTableCellEditorComponent(JTable table, Object value,
			boolean isSelected, int row, int column) {
		
		this.row = row;
		this.column = column;

		return cellEditors[row][column].getTableCellEditorComponent(table, "",
		          isSelected, row, column);
		
	}

	public Object getCellEditorValue() {
		//Retrun a value according to the component
		if ( cellEditors[row][column].getComponent() instanceof JComboBox ){
			JComboBox c = (JComboBox)cellEditors[row][column].getComponent();
			return c.getSelectedItem();
		} else if ( cellEditors[row][column].getComponent() instanceof JCheckBox ){
			JCheckBox c = (JCheckBox)cellEditors[row][column].getComponent();
			return c.isSelected();
		}
		
		return null;
	}
	

}

The table model handles the appearance of the cell content:

import javax.swing.*;
import javax.swing.table.*;

public class MyTableModel extends DefaultTableModel {
	static final long serialVersionUID = 2;
	
    public Class<?> getColumnClass(int columnIndex) {
    	
    	if ( (columnIndex == 4)  || (columnIndex == 7) ) {
    		//Checkbox
    		return Boolean.class;
    	} else if ( columnIndex == 1 ) {
    		//Combobox
    		return JComboBox.class;
    	} else {
    		//No special model.
    		return super.getColumnClass(columnIndex);
    	}
    	
    }
    
    
    public boolean isCellEditable(int rowIndex, int vColIndex) {
        //Some locked cells
    	if ( (vColIndex == 0) || (vColIndex == 2) ) {
    		return false;
    	}
    	
    	return true;
    	
    }
	
	
}

Hope that helps someone with the same problem... It took me a while to figure out which method handles what...