/**
* This method implements the TableModelListener
*
* @param e The event to listen for.
*/
@Override
public void tableChanged(TableModelEvent e) {
if (!isColumnDataIncluded) {
return;
}
// A cell has been updated
if (e.getType() == TableModelEvent.UPDATE) {
int column = table.convertColumnIndexToView(e.getColumn());
// Only need to worry about an increase in width for this cell
if (isOnlyAdjustLarger) {
int row = e.getFirstRow();
TableColumn tableColumn = table.getColumnModel().getColumn(column);
if (tableColumn.getResizable()) {
int width = getCellDataWidth(row, column);
updateTableColumn(column, width);
}
} // Could be an increase of decrease so check all rows
else {
adjustColumn(column);
}
} // The update affected more than one column so adjust all columns
else {
adjustColumns();
}
}
/*
* Adjust the width of the specified column in the table
*/
public void adjustColumn(final int column) {
TableColumn tableColumn = table.getColumnModel().getColumn(column);
if (!tableColumn.getResizable()) return;
int columnHeaderWidth = getColumnHeaderWidth(column);
int columnDataWidth = getColumnDataWidth(column);
int preferredWidth = Math.max(columnHeaderWidth, columnDataWidth);
updateTableColumn(column, preferredWidth);
}
/*
* Update the TableColumn with the newly calculated width
*/
private void updateTableColumn(int column, int width) {
final TableColumn tableColumn = table.getColumnModel().getColumn(column);
if (!tableColumn.getResizable()) return;
width += spacing;
// Don't shrink the column width
if (isOnlyAdjustLarger) {
width = Math.max(width, tableColumn.getPreferredWidth());
}
columnSizes.put(tableColumn, new Integer(tableColumn.getWidth()));
table.getTableHeader().setResizingColumn(tableColumn);
tableColumn.setWidth(width);
}
public static void main(String args[]) {
final Object rowData[][] = {
{"1", "one", "I"},
{"2", "two", "II"},
{"3", "three", "III"}
};
final String columnNames[] = {"#", "English", "Roman"};
final JTable table = new JTable(rowData, columnNames);
JScrollPane scrollPane = new JScrollPane(table);
JFrame frame = new JFrame("Resizing Table");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scrollPane, BorderLayout.CENTER);
TableColumn tc = null;
for (int i = 0; i < 3; i++) {
tc = table.getColumnModel().getColumn(i);
if (tc.getModelIndex() == 0) tc.setResizable(false);
if (i == 2) {
tc.setPreferredWidth(100); // sport column is bigger
} else {
tc.setPreferredWidth(50);
}
System.out.printf(
"column [%s] header=[%s] modelIndex=[%d] resizable=[%b] minWidth=[%s] maxWidth=[%d] preferredWidth=[%d]\n",
tc.getIdentifier(),
tc.getHeaderValue(),
tc.getModelIndex(),
tc.getResizable(),
tc.getMinWidth(),
tc.getMaxWidth(),
tc.getPreferredWidth());
}
frame.setSize(300, 150);
frame.setVisible(true);
}