protected override SizeF CalculateInnerDesiredSize(SizeF totalSize)
{
if (ColumnDefinitions.Count == 0)
{
ColumnDefinitions.Add(new ColumnDefinition());
}
if (RowDefinitions.Count == 0)
{
RowDefinitions.Add(new RowDefinition());
}
// Reset values before we start measure the children.
ColumnDefinitions.ResetAllCellLengths();
RowDefinitions.ResetAllCellLengths();
// Set the Width/Hight of the Columns/Rows according to the sizes of the children.
foreach (FrameworkElement child in GetVisibleChildren())
{
int col = GetColumn(child);
int row = GetRow(child);
if (col >= ColumnDefinitions.Count)
{
col = ColumnDefinitions.Count - 1;
}
if (col < 0)
{
col = 0;
}
if (row >= RowDefinitions.Count)
{
row = RowDefinitions.Count - 1;
}
if (row < 0)
{
row = 0;
}
SizeF childSize = new SizeF(totalSize.Width, totalSize.Height);
// FIXME Albert: Would be better to use the size which is really available for the child here,
// but this is not so easy to calculate (depends on col/row definition(s), colspan/rowspan)
child.Measure(ref childSize);
ColumnDefinitions.SetDesiredLength(col, GetColumnSpan(child), childSize.Width);
RowDefinitions.SetDesiredLength(row, GetRowSpan(child), childSize.Height);
}
return(new SizeF((float)ColumnDefinitions.TotalDesiredLength, (float)RowDefinitions.TotalDesiredLength));
}