public VirtualizedGridLayout(ICellInfoManager info, IList <IList> cells, DataTemplate template)
{
var vv = new InfoMeasurerProxy(MeasureRow, MeasureColumn);
vv.SetInfo(info);
this.info = vv;
this.cells = cells;
this.template = template;
rScanner = new VTools(x => info.GetRowHeight(x, cells));
cScanner = new VTools(x => info.GetColumnmWidth(x, cells));
Children.Add(new BoxView {
WidthRequest = 0, HeightRequest = 0, BackgroundColor = Color.Transparent
}); // forces onlayout to be called
}
public double GetRowHeight(int row, IList <IList> src)
{
var bm = info.GetRowHeight(row, src);
if (bm == -1) // measure
{
if (MeasureOverrideRows.ContainsKey(row))
{
return(MeasureOverrideRows[row]);
}
else
{
return(MeasureOverrideRows[row] = MeasureRow(row));
}
}
else
{
return(bm);
}
}