protected override Size ArrangeOverride(Size finalSize)
{
if (!_cells.Any())
{
return(finalSize);
}
var grid = DataGridLite.GetGrid(this);
var widths = grid.SpeculateColumnWidths(finalSize.Width);
var left = 0d;
for (var i = 0; i < widths.Length; i++)
{
var cell = _cells[i];
var width = widths[i];
cell.Arrange(new Rect(left, 0, width, grid.RowHeight));
left += width;
}
return(finalSize);
}
protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == WidthProperty)
{
var rows = _cells.Select(LiteRow.GetRow).ToList();
rows.ForEach(r => r.InvalidateArrange());
}
if (e.Property == HeaderTemplateProperty)
{
var grid = DataGridLite.GetGrid(this);
if (grid == null)
{
return;
}
grid.InvalidateHeader();
}
if (e.Property == CellTemplateProperty)
{
var grid = DataGridLite.GetGrid(this);
if (grid == null)
{
return;
}
grid.InvalidateRows();
}
if (e.Property == DataMemberProperty)
{
var dataPath = string.IsNullOrWhiteSpace(DataMember) ? "(0).Item" : "(0).Item." + DataMember;
foreach (var element in _cells.OfType <FrameworkElement>())
{
element.SetBinding(FrameworkElement.DataContextProperty, new Binding {
Path = new PropertyPath(dataPath, LiteRow.RowProperty.DependencyProperty), Source = element, Mode = BindingMode.OneWay
});
}
}
}
private static void SetGrid(DependencyObject child, DataGridLite grid)
{
child.SetValue(GridProperty, grid);
}