Amit :
I am trying to use the value in a checkbox ( in each row of a JTable) to manipulate data. But when I click on the checkbox of same row for the second time the listener valueChanged method is not called.
It can be easily reproduced by downloading the table example from oracle website here
Try to click on the checkbox of same row twice. The console logs does not changes when we click the checkbox for the second time.
SOLUTION : With the help of the comment and solution provided . Using TableModelListener has served my purpose .
MadProgrammer :
Yes . I did tried with the table model listener but it is also behaving in the same manner .
Works for me...
Modified TableSelectionDemo to add TableModelListener support
import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Dimension;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.TableModel;
public class TableSelectionDemo extends JPanel
implements ActionListener {
private JTable table;
private JCheckBox rowCheck;
private JCheckBox columnCheck;
private JCheckBox cellCheck;
private ButtonGroup buttonGroup;
private JTextArea output;
public TableSelectionDemo() {
super();
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
TableModel model = new MyTableModel();
model.addTableModelListener(new TableModelListener() {
@Override
public void tableChanged(TableModelEvent e) {
output.append("Table changed");
output.append("\n");
}
});
table = new JTable(model);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);
table.getSelectionModel().addListSelectionListener(new RowListener());
table.getColumnModel().getSelectionModel().
addListSelectionListener(new ColumnListener());
add(new JScrollPane(table));
add(new JLabel("Selection Mode"));
buttonGroup = new ButtonGroup();
addRadio("Multiple Interval Selection").setSelected(true);
addRadio("Single Selection");
addRadio("Single Interval Selection");
add(new JLabel("Selection Options"));
rowCheck = addCheckBox("Row Selection");
rowCheck.setSelected(true);
columnCheck = addCheckBox("Column Selection");
cellCheck = addCheckBox("Cell Selection");
cellCheck.setEnabled(false);
output = new JTextArea(5, 40);
output.setEditable(false);
add(new JScrollPane(output));
}
private JCheckBox addCheckBox(String text) {
JCheckBox checkBox = new JCheckBox(text);
checkBox.addActionListener(this);
add(checkBox);
return checkBox;
}
private JRadioButton addRadio(String text) {
JRadioButton b = new JRadioButton(text);
b.addActionListener(this);
buttonGroup.add(b);
add(b);
return b;
}
public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
//Cell selection is disabled in Multiple Interval Selection
//mode. The enabled state of cellCheck is a convenient flag
//for this status.
if ("Row Selection".equals(command)) {
table.setRowSelectionAllowed(rowCheck.isSelected());
//In MIS mode, column selection allowed must be the
//opposite of row selection allowed.
if (!cellCheck.isEnabled()) {
table.setColumnSelectionAllowed(!rowCheck.isSelected());
}
} else if ("Column Selection".equals(command)) {
table.setColumnSelectionAllowed(columnCheck.isSelected());
//In MIS mode, row selection allowed must be the
//opposite of column selection allowed.
if (!cellCheck.isEnabled()) {
table.setRowSelectionAllowed(!columnCheck.isSelected());
}
} else if (command == "Cell Selection") {
table.setCellSelectionEnabled(cellCheck.isSelected());
} else if (command == "Multiple Interval Selection") {
table.setSelectionMode(
ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
//If cell selection is on, turn it off.
if (cellCheck.isSelected()) {
cellCheck.setSelected(false);
table.setCellSelectionEnabled(false);
}
//And don't let it be turned back on.
cellCheck.setEnabled(false);
} else if ("Single Interval Selection".equals(command)) {
table.setSelectionMode(
ListSelectionModel.SINGLE_INTERVAL_SELECTION);
//Cell selection is ok in this mode.
cellCheck.setEnabled(true);
} else if (command == "Single Selection") {
table.setSelectionMode(
ListSelectionModel.SINGLE_SELECTION);
//Cell selection is ok in this mode.
cellCheck.setEnabled(true);
}
//Update checkboxes to reflect selection mode side effects.
rowCheck.setSelected(table.getRowSelectionAllowed());
columnCheck.setSelected(table.getColumnSelectionAllowed());
if (cellCheck.isEnabled()) {
cellCheck.setSelected(table.getCellSelectionEnabled());
}
}
private void outputSelection() {
output.append(String.format("Lead: %d, %d. ",
table.getSelectionModel().getLeadSelectionIndex(),
table.getColumnModel().getSelectionModel().
getLeadSelectionIndex()));
output.append("Rows:");
for (int c : table.getSelectedRows()) {
output.append(String.format(" %d", c));
}
output.append(". Columns:");
for (int c : table.getSelectedColumns()) {
output.append(String.format(" %d", c));
}
output.append(".\n");
}
private class RowListener implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
return;
}
output.append("ROW SELECTION EVENT. ");
outputSelection();
}
}
private class ColumnListener implements ListSelectionListener {
public void valueChanged(ListSelectionEvent event) {
if (event.getValueIsAdjusting()) {
return;
}
output.append("COLUMN SELECTION EVENT. ");
outputSelection();
}
}
class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith",
"Snowboarding", new Integer(5), new Boolean(false)},
{"John", "Doe",
"Rowing", new Integer(3), new Boolean(true)},
{"Sue", "Black",
"Knitting", new Integer(2), new Boolean(false)},
{"Jane", "White",
"Speed reading", new Integer(20), new Boolean(true)},
{"Joe", "Brown",
"Pool", new Integer(10), new Boolean(false)}
};
public int getColumnCount() {
return columnNames.length;
}
public int getRowCount() {
return data.length;
}
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int row, int col) {
return data[row][col];
}
/*
* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
*/
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
}
/*
* Don't need to implement this method unless your table's
* editable.
*/
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;
}
}
/*
* Don't need to implement this method unless your table's
* data can change.
*/
public void setValueAt(Object value, int row, int col) {
data[row][col] = value;
fireTableCellUpdated(row, col);
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Disable boldface controls.
UIManager.put("swing.boldMetal", Boolean.FALSE);
//Create and set up the window.
JFrame frame = new JFrame("TableSelectionDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
TableSelectionDemo newContentPane = new TableSelectionDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}