internal void Invalidate(CellRange rng)
{
// negative parameters mean 'whole row' or 'whole column'
if (rng.Row > -1 || rng.Column > -1)// Keep the range as invalid when rng.IsEmpty so that it can remove all the cells after a row was removed, otherwise it can leave non used cells because Rows.Count is less than there was in previous layout.
{
if (rng.Row < 0)
{
rng.Row = 0;
rng.Row2 = Rows.Count - 1;
}
if (rng.Column < 0)
{
rng.Column = 0;
rng.Column2 = Columns.Count - 1;
}
}
// optimization (especially important when setting unbound values)
if (rng.IsValid &&
!ViewRange.Intersects(rng) &&
!Columns.IsFrozen(rng.LeftColumn) &&
!Rows.IsFrozen(rng.TopRow))
{
return;
}
// remove cells so they can be re-created
List <CellRange> removeCells = new List <CellRange>();
foreach (var rg in _cells.Keys)
{
if (!rg.IsValid || !rng.IsValid || rg.Intersects(rng))
{
removeCells.Add(rg);
}
}
for (int i = 0; i < removeCells.Count; i++)
{
RemoveCell(removeCells[i]);
}
if (removeCells.Count == 0)
{
InvalidateArrange();
UpdateViewRange();
}
}
