Why does SWT not show all rows of a Table contained in a ScrolledComposite? - swt

Question

I took the attached code from How to always show vertical scroll bar in SWT table?, except for the nuber of rows being 4000 instead of 20. In that case I can not go beyond 1416 rows in the table, what is the reason for that ?
private static final int MAX_ROWS = 4000;
public static void main(String[] args)
{
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
final ScrolledComposite composite = new ScrolledComposite(shell, SWT.V_SCROLL);
composite.setLayout(new GridLayout());
composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
final Table table = new Table(composite, SWT.NO_SCROLL | SWT.FULL_SELECTION);
table.setHeaderVisible(true);
composite.setContent(table);
composite.setExpandHorizontal(true);
composite.setExpandVertical(true);
composite.setAlwaysShowScrollBars(true);
composite.setMinSize(table.computeSize(SWT.DEFAULT, SWT.DEFAULT));
Button fillTable = new Button(shell, SWT.PUSH);
fillTable.setText("Fill table");
fillTable.setLayoutData(new GridData(SWT.FILL, SWT.END, true, false));
fillTable.addListener(SWT.Selection, new Listener()
{
#Override
public void handleEvent(Event arg0)
{
if (table.getColumnCount() < 1)
{
for (int col = 0; col < 4; col++)
{
TableColumn column = new TableColumn(table, SWT.NONE);
column.setText("Column " + col);
}
}
for (int row = 0; row < MAX_ROWS; row++)
{
TableItem item = new TableItem(table, SWT.NONE);
for (int col = 0; col < table.getColumnCount(); col++)
{
item.setText(col, "Item " + row + " " + col);
}
}
for (int col = 0; col < table.getColumnCount(); col++)
{
table.getColumn(col).pack();
}
composite.setMinSize(table.computeSize(SWT.DEFAULT, SWT.DEFAULT));
}
});
Button clearTable = new Button(shell, SWT.PUSH);
clearTable.setText("Clear table");
clearTable.setLayoutData(new GridData(SWT.FILL, SWT.END, true, false));
clearTable.addListener(SWT.Selection, new Listener()
{
#Override
public void handleEvent(Event arg0)
{
table.removeAll();
composite.setMinSize(table.computeSize(SWT.DEFAULT, SWT.DEFAULT));
}
});
shell.pack();
shell.setSize(400, 300);
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}