protected virtual void UpdateTemplatedCell(TemplatedCell cell, NSIndexPath indexPath)
{
cell.ContentSizeChanged -= CellContentSizeChanged;
cell.LayoutAttributesChanged -= CellLayoutAttributesChanged;
var bindingContext = ItemsSource[indexPath];
// If we've already created a cell for this index path (for measurement), re-use the content
if (_measurementCells.TryGetValue(bindingContext, out TemplatedCell measurementCell))
{
_measurementCells.Remove(bindingContext);
measurementCell.ContentSizeChanged -= CellContentSizeChanged;
measurementCell.LayoutAttributesChanged -= CellLayoutAttributesChanged;
cell.UseContent(measurementCell);
}
else
{
cell.Bind(ItemsView.ItemTemplate, ItemsSource[indexPath], ItemsView);
}
cell.ContentSizeChanged += CellContentSizeChanged;
cell.LayoutAttributesChanged += CellLayoutAttributesChanged;
ItemsViewLayout.PrepareCellForLayout(cell);
}
void UpdateTemplatedSupplementaryView(TemplatedCell cell, NSString elementKind, NSIndexPath indexPath)
{
DataTemplate template = elementKind == UICollectionElementKindSectionKey.Header
? ItemsView.GroupHeaderTemplate
: ItemsView.GroupFooterTemplate;
var bindingContext = ItemsSource.Group(indexPath);
cell.Bind(template, bindingContext, ItemsView);
if (cell is ItemsViewCell)
{
cell.ConstrainTo(GetLayoutSpanCount() * ItemsViewLayout.ConstrainedDimension);
}
}