public override Size MeasureItem(int index, int widthConstraint, int heightConstraint)
{
if (widthConstraint > heightConstraint)
{
widthConstraint = int.MaxValue;
}
if (heightConstraint > widthConstraint)
{
heightConstraint = int.MaxValue;
}
var item = this[index];
if (item != null && _dataBindedViewTable.TryGetValue(item, out View? createdView) && createdView != null)
{
return(createdView.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), DPExtensions.ConvertToScaledDP(heightConstraint), MeasureFlags.IncludeMargins).Request.ToEFLPixel());
}
View?view = null;
if (ItemTemplate is DataTemplateSelector selector)
{
view = selector.SelectTemplate(this[index], Element).CreateContent() as View;
}
else
{
view = ItemTemplate.CreateContent() as View;
}
if (view != null)
{
view.Parent = Element;
if (Count > index)
{
view.BindingContext = this[index];
}
var request = view.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), DPExtensions.ConvertToScaledDP(heightConstraint), MeasureFlags.IncludeMargins).Request;
return(request.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 MeasureFooter(int widthConstraint, int heightConstraint)
{
return(_footerCache?.Measure(DPExtensions.ConvertToScaledDP(widthConstraint), double.PositiveInfinity).Request.ToEFLPixel() ?? new Size(0, 0));
}