user564874 user564874 - 3 months ago 28
Java Question

How to select all text in JTable cell when editing

I would like to have the editor in my editable JTables select all text in the cell when starting to edit. I have tried a couple of things that all revolve around calling JTextComponent.selectAll() on the component that is returned from the TableCellEditor.getTableCellEditorComponent method. None of the things I tried worked.

In my latest attempt, I altered the SimpleTableDemo class from the Swing tutorial to use a custom TableCellEditor that calls the selectAll method. In the debugger I can see that the selectAll() method is being called, but the table still goes into edit mode without selecting the text in the cell (or perhaps the selection is being cleared before display). That code is below. Can anybody tell me where I'm going wrong?


import javax.swing.DefaultCellEditor;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.text.JTextComponent;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class SimpleTableDemo extends JPanel {
private boolean DEBUG = false;

public SimpleTableDemo() {
super(new GridLayout(1,0));

String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};

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)}
};

final JTable table = new SelectingTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
table.setFillsViewportHeight(true);

if (DEBUG) {
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
printDebugData(table);
}
});
}

//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

Answer

The Table Select All Editor should work for you. It is the preferred solution so you don't have to keep creating custom editors. That is the columns containing integers should only accept integers. With you current code

Your code does work partially. If you start editing using the F2 key, then the text is selected. However, when you use the mouse and double click on the cell then the second mouse event is passed to the editor so the caret can be positioned where you clicked and this removes the selection. A solution for this is:

final JTextComponent jtc = (JTextComponent)c;
jtc.requestFocus();
//jtc.selectAll();
SwingUtilities.invokeLater(new Runnable()
{
    public void run()
    {
        jtc.selectAll();
    }
});
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