public static void UpdateItemsLayout(this TCollectionView platformView, StructuredItemsView view)
{
if (view.ItemsLayout != null)
{
var itemSizingStrategy = view.ItemSizingStrategy.ToPlatform();
if (view.ItemsLayout is GridItemsLayout grid)
{
var orientation = grid.Orientation == ItemsLayoutOrientation.Horizontal;
var verticalItemSpacing = DPExtensions.ConvertToScaledPixel(grid.VerticalItemSpacing);
var horizontalItemSpacing = DPExtensions.ConvertToScaledPixel(grid.HorizontalItemSpacing);
platformView.LayoutManager = new GridLayoutManager(orientation, grid.Span, itemSizingStrategy, verticalItemSpacing, horizontalItemSpacing);
}
else if (view.ItemsLayout is LinearItemsLayout linear)
{
var orientation = linear.Orientation == ItemsLayoutOrientation.Horizontal;
var itemSpacing = DPExtensions.ConvertToScaledPixel(linear.ItemSpacing);
platformView.LayoutManager = new LinearLayoutManager(orientation, itemSizingStrategy, itemSpacing);
}
else
{
platformView.LayoutManager = new LinearLayoutManager(false);
}
platformView.SnapPointsType = (view.ItemsLayout as ItemsLayout).SnapPointsType.ToPlatform();
platformView.SelectionMode = (view as SelectableItemsView).SelectionMode.ToPlatform();
}
}
public override Size MeasureItem(int index, int widthConstraint, int heightConstraint)
{
var item = this[index];
if (item != null && _dataBindedViewTable.TryGetValue(item, out View? createdView) && createdView != null)
{
return createdView.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), double.PositiveInfinity, MeasureFlags.IncludeMargins).Request.ToEFLPixel();
}
return new Size(0, 0);
}
void UpdateFooterLayout(double widthConstraint, double heightConstraint)
{
if (_footerView != null)
{
var requestSize = _footerView.Measure(widthConstraint, heightConstraint);
if (_navigationView.Footer != null)
{
_navigationView.Footer.MinimumHeight = TDPExtensions.ConvertToScaledPixel(requestSize.Request.Height);
}
}
}
public override Size MeasureItem(int index, int widthConstraint, int heightConstraint)
{
View?view = GetTemplatedView(index);
if (view != null)
{
var native = view.ToPlatform(_context);
view.Parent = _element;
if (Count > index)
{
view.BindingContext = this[index];
}
var size = view.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), DPExtensions.ConvertToScaledDP(heightConstraint), MeasureFlags.IncludeMargins).Request;
native.Unrealize();
return(size.ToEFLPixel());
}
return(new Size(0, 0));
}
public override Size MeasureHeader(int widthConstraint, int heightConstraint)
{
return(_headerCache?.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), DPExtensions.ConvertToScaledDP(heightConstraint)).Request.ToEFLPixel() ?? new Size(0, 0));
}
public override Size MeasureHeader(int widthConstraint, int heightConstraint)
{
return _headerCache?.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), double.PositiveInfinity).Request.ToEFLPixel() ?? new Size(0, 0);
}
