Brett Carver

I would prefer to not setup a listener for this. Seems like overkill just to find the current selection.

In another forum I was given this link: http://javaalmanac.com/egs/javax.swing.table/GetAnchor.html?l=rel

It demonstrates the use of the Anchor point which I believe will solve my problem. I've prototyped it and it seems to work correctly (giving me the location of the specific cell within the larger selected area).

Let's say you have a table. You do an area select within the table (click&drag or click&shift-click). Then you do some sort of a search function or the like that results in a cell within the selected area being highlighted. That is, some operation that results in something like: table.changeSelection(row, column, true, true);

So now you have a selected area with a highlighted cell. How do you determine what cell is highlighted? The functions table.getSelectedRow() and table.getSelectedColumn() will give you the top/left cell of the selected area. But I can't find any other functions that will give me the location of that one cell.

Any ideas? Thanks.

Well it's been a while with no replies. Can anyone help me here? Is there a change in behavior (I need to "fix" my code) or is there are true problem with Java 1.5?

The application I'm working on has a search function for a large table of data. In addition, you can restrict the search to a selected area of the table. This worked fine when compiled on Java 1.4 (1.4.2_06), but has stopped working on Java 1.5 (1.5.0_03). It appears the problem is with JTable.changeSelection() not actually changing the selection to the cell that was found in the search.

I've been able to reproduce the problem with some small modifications to the SimpleTableSelectionDemo.java tutorial program. I've included the code below with my changes.

Basically all I did was modify the mouseListener so that instead of printing the table contents, it calls changeSelection to a fixed location (simulating the search going to a matching cell).

If I compile/run in 1.4, I can select a cell or region, right-click the mouse and see the specified cell selected. If I start typing the selected cell is edited.

If I compile/run in 1.5, when I right-click the selected cell is not changed (the second selected cell of the select region stays selected). If I start typing the wrong cell is edited.

Hopefully someone can tell me if this is a pilot error, a run-time bug, or a change in behavior (and what I need to do to get it working again in 1.5).

Thanks.

/* * SimpleTableSelectionDemo.java is a 1.4 application that requires no other files. */ import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.JComponent; import javax.swing.ListSelectionModel; import javax.swing.event.ListSelectionEvent; import javax.swing.event.ListSelectionListener; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; /** * SimpleTableSelectionDemo is just like SimpleTableDemo, * except that it detects selections, printing information * about the current selection to standard output. */ public class SimpleTableSelectionDemo extends JPanel { private boolean DEBUG = true; private boolean ALLOW_COLUMN_SELECTION = true; private boolean ALLOW_ROW_SELECTION = true; public SimpleTableSelectionDemo() { super(new GridLayout(1,0)); final String[] columnNames = {"First Name", "Last Name", "Sport", "# of Years", "Vegetarian"}; final Object[][] data = { {"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)}, {"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)}, {"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)}, {"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)}, {"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)} }; final JTable table = new JTable(data, columnNames); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); table.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION); if (ALLOW_ROW_SELECTION) { // true by default ListSelectionModel rowSM = table.getSelectionModel(); rowSM.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { //Ignore extra messages. if (e.getValueIsAdjusting()) return; ListSelectionModel lsm = (ListSelectionModel)e.getSource(); if (lsm.isSelectionEmpty()) { System.out.println("No rows are selected."); } else { int selectedRow = lsm.getMinSelectionIndex(); System.out.println("Row " + selectedRow + " is now selected."); } } }); } else { table.setRowSelectionAllowed(false); } if (ALLOW_COLUMN_SELECTION) { // false by default if (ALLOW_ROW_SELECTION) { //We allow both row and column selection, which //implies that we *really* want to allow individual //cell selection. table.setCellSelectionEnabled(true); } table.setColumnSelectionAllowed(true); ListSelectionModel colSM = table.getColumnModel().getSelectionModel(); colSM.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { //Ignore extra messages. if (e.getValueIsAdjusting()) return; ListSelectionModel lsm = (ListSelectionModel)e.getSource(); if (lsm.isSelectionEmpty()) { System.out.println("No columns are selected."); } else { int selectedCol = lsm.getMinSelectionIndex(); System.out.println("Column " + selectedCol + " is now selected."); } } }); } if (DEBUG) { table.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { // printDebugData(table); // ============================================== // Changed to do a changeSelection() on a right-click // without clearing any existing selected area. if (e.getButton() == MouseEvent.BUTTON3) { System.out.println("mouse clicked"); table.changeSelection(2, 3, true, true); } // ============================================== } }); } //Create the scroll pane and add the table to it. JScrollPane scrollPane = new JScrollPane(table); //Add the scroll pane to this panel. add(scrollPane); } private void printDebugData(JTable table) { int numRows = table.getRowCount(); int numCols = table.getColumnCount(); javax.swing.table.TableModel model = table.getModel(); System.out.println("Value of data: "); for (int i=0; i < numRows; i++) { System.out.print(" row " + i + ":"); for (int j=0; j < numCols; j++) { System.out.print(" " + model.getValueAt(i, j)); } System.out.println(); } System.out.println("--------------------------"); } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("SimpleTableSelectionDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. SimpleTableSelectionDemo newContentPane = new SimpleTableSelectionDemo(); 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(); } }); } }