JTable - Getting a cell into Edit mode on pressing Tab
You can achieve this programatically, you simply listen to the focus events on the cell, on focus and editing allowed, start editing.
More on this thread and example
Here's a code snippet that I put together for a project that I was working on. The code has been tested and verified for a table that has non-editable cells in the first and last column. The class restricts tabbing to only the editable cells of the table. It also supports shift-tabbing to tab in reverse.
public class JTableCellTabbing {
/**
*
* Creates a new {@code JTableCellTabbing} object.
*
*
*/
private JTableCellTabbing() {
}
/**
*
* Set Action Map for tabbing and shift-tabbing for the JTable
*
*
* @param theTable - Jtable with NRows and MCols of cells
* @param startRow - valid start row for tabbing [ 0 - (numRows-1) ]
* @param numRows - Number of rows for tabbing
* @param startCol - valid start col for tabbing [ 0 - (numCols-1) ]
* @param numCols - Number of columns for tabbing
*/
@SuppressWarnings("serial")
static public void setTabMapping(final JTable theTable, final int startRow, final int numRows, final int startCol, final int numCols) {
if (theTable == null) {
throw new IllegalArgumentException("theTable is null");
}
// Calculate last row and column for tabbing
final int endRow = startRow + (numRows - 1);
final int endCol = startCol + (numCols - 1);
// Check for valid range
if ((startRow > endRow) || (startCol > endCol)) {
throw new IllegalArgumentException("Table Size incorrect");
}
// Get Input and Action Map to set tabbing order on the JTable
InputMap im = theTable.getInputMap(JTable.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
ActionMap am = theTable.getActionMap();
// Get Tab Keystroke
KeyStroke tabKey = KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0);
am.put(im.get(tabKey), new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
int row = theTable.getSelectedRow();
int col = theTable.getSelectedColumn();
col++;
// Move to next row and left column
if (col > endCol) {
col = startCol;
row++;
}
// Move to top row
if (row > endRow ) {
row = startRow;
}
// Move cell selection
theTable.changeSelection(row, col, false, false);
}
});
// Get Shift tab Keystroke
KeyStroke shiftTab =
KeyStroke.getKeyStroke(KeyEvent.VK_TAB, java.awt.event.InputEvent.SHIFT_DOWN_MASK);
am.put(im.get(shiftTab), new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
int row = theTable.getSelectedRow();
int col = theTable.getSelectedColumn();
col--;
// Move to top right cell
if (col < startCol) {
col = endCol;
row--;
}
// Move to bottom row
if (row < startRow ) {
row = endRow;
}
// Move cell selection
theTable.changeSelection(row, col, false, false);
}
});
}
}
And here's how the class is used for your table:
JTable myTable = new JTable();
// Set up table attributes....
JTableCellTabbing.setTabMapping(myTable, 0, NUM_ROWS, 1, (NUM_COLS-1));
Thank you n00213f. The thread and example from your post were helpful. By overloading the changeSelection method in JTable as hinted to in the thread, JTable checks if a cell is editable every time the selection is changed. If the cell is editable, it will show the CellEditor and transfer focus to the editor component.
For completeness, here is my solution:
JTable myTable = new javax.swing.JTable()
{
public void changeSelection(final int row, final int column, boolean toggle, boolean extend)
{
super.changeSelection(row, column, toggle, extend);
myTable.editCellAt(row, column);
myTable.transferFocus();
}
};