Select multiple lines in JTable

Question

I have a JTable that has one column that cannot be edited, and the second column is a flag that displays booleans .... Now I want when the user selects several rows and deselects one of the selected flags, then all the flags are under choices should be lifted and vice versa.

Answer 1

Using the @Hovercraft example and the @camickr tip, the example below shows a suitable user interface. Although it uses buttons, SelectionAction also suitable for menus or pop-ups.

 import java.awt.*; import java.awt.event.ActionEvent; import javax.swing.*; import javax.swing.DefaultListSelectionModel; import javax.swing.table.DefaultTableModel; /** @see http://stackoverflow.com/questions/4526779 */ public class CheckABunch extends JPanel { private static final int CHECK_COL = 1; private static final Object[][] DATA = { {"One", Boolean.TRUE}, {"Two", Boolean.FALSE}, {"Three", Boolean.TRUE}, {"Four", Boolean.FALSE}, {"Five", Boolean.TRUE}, {"Six", Boolean.FALSE}, {"Seven", Boolean.TRUE}, {"Eight", Boolean.FALSE}, {"Nine", Boolean.TRUE}, {"Ten", Boolean.FALSE}}; private static final String[] COLUMNS = {"Number", "CheckBox"}; private DataModel dataModel = new DataModel(DATA, COLUMNS); private JTable table = new JTable(dataModel); private DefaultListSelectionModel selectionModel; public CheckABunch() { super(new BorderLayout()); this.add(new JScrollPane(table)); this.add(new ControlPanel(), BorderLayout.SOUTH); table.setPreferredScrollableViewportSize(new Dimension(250, 175)); selectionModel = (DefaultListSelectionModel) table.getSelectionModel(); } private class DataModel extends DefaultTableModel { public DataModel(Object[][] data, Object[] columnNames) { super(data, columnNames); } @Override public Class<?> getColumnClass(int columnIndex) { if (columnIndex == CHECK_COL) { return getValueAt(0, CHECK_COL).getClass(); } return super.getColumnClass(columnIndex); } @Override public boolean isCellEditable(int row, int column) { return column == CHECK_COL; } } private class ControlPanel extends JPanel { public ControlPanel() { this.add(new JLabel("Selection:")); this.add(new JButton(new SelectionAction("Clear", false))); this.add(new JButton(new SelectionAction("Check", true))); } } private class SelectionAction extends AbstractAction { boolean value; public SelectionAction(String name, boolean value) { super(name); this.value = value; } @Override public void actionPerformed(ActionEvent e) { for (int i = 0; i < dataModel.getRowCount(); i++) { if (selectionModel.isSelectedIndex(i)) { dataModel.setValueAt(value, i, CHECK_COL); } } } } private static void createAndShowUI() { JFrame frame = new JFrame("CheckABunch"); frame.add(new CheckABunch()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { createAndShowUI(); } }); } } 

Answer 2

The problem is that when you click on a flag to change the value of this flag, the selection of all rows will be lost. Thus, you may need to right-click to display a pop-up menu that contains selection / deselection values.

Then you can use table.getSelectedRows () to get the indices of all the selected rows that need to be updated.

Answer 3

You can get a selection interval with code like this:

 table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){ public void valueChanged(ListSelectionEvent e) { minSelectedRow = ((DefaultListSelectionModel)e.getSource()).getMinSelectionIndex(); maxSelectedRow = ((DefaultListSelectionModel)e.getSource()).getMaxSelectionIndex(); } }); 

Then, when one flag is set (listening on ItemEvent ), you should minSelectedRow from minSelectedRow to maxSelectedRow and change the checked flags. What is it.

Answer 4

I agree with Roman that his idea will work if you use the class field to select min and max. For instance:

 import javax.swing.*; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; import javax.swing.event.TableModelEvent; import javax.swing.event.TableModelListener; import javax.swing.table.DefaultTableModel; public class CheckABunch extends JPanel { private static final Object[][] DATA = {{"One", Boolean.TRUE}, {"Two", Boolean.FALSE}, {"Three", Boolean.TRUE}, {"Four", Boolean.FALSE}, {"Five", Boolean.TRUE}, {"Six", Boolean.FALSE}, {"Seven", Boolean.TRUE}, {"Eight", Boolean.FALSE}}; private static final String[] COLUMNS = {"Number", "CheckBox"}; private DefaultTableModel model = new DefaultTableModel(DATA, COLUMNS) { @Override public Class<?> getColumnClass(int columnIndex) { if (columnIndex == 1) { return getValueAt(0, 1).getClass(); } return super.getColumnClass(columnIndex); } }; private JTable table = new JTable(model); private int minSelectedRow = -1; private int maxSelectedRow = -1; boolean tableModelListenerIsChanging = false; public CheckABunch() { add(new JScrollPane(table)); table.getSelectionModel().addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { if (e.getValueIsAdjusting()) { return; } minSelectedRow = ((DefaultListSelectionModel) e.getSource()).getMinSelectionIndex(); maxSelectedRow = ((DefaultListSelectionModel) e.getSource()).getMaxSelectionIndex(); } }); model.addTableModelListener(new TableModelListener() { public void tableChanged(TableModelEvent e) { if (tableModelListenerIsChanging) { return; } int firstRow = e.getFirstRow(); int column = e.getColumn(); if (column != 1 || maxSelectedRow == -1 || minSelectedRow == -1) { return; } tableModelListenerIsChanging = true; boolean value = ((Boolean)model.getValueAt(firstRow, column)).booleanValue(); for (int i = minSelectedRow; i <= maxSelectedRow; i++) { model.setValueAt(Boolean.valueOf(value), i, column); } // *** edit: added two lines minSelectedRow = -1; maxSelectedRow = -1; tableModelListenerIsChanging = false; } }); } private static void createAndShowUI() { JFrame frame = new JFrame("CheckABunch"); frame.getContentPane().add(new CheckABunch()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { createAndShowUI(); } }); } }