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 GetColumnmWidth(int col, IList <IList> src)
{
var bm = info.GetColumnmWidth(col, src);
if (bm == -1) // measure
{
if (MeasureOverrideColumns.ContainsKey(col))
{
return(MeasureOverrideColumns[col]);
}
else
{
return(MeasureOverrideColumns[col] = MeasureColumn(col));
}
}
else
{
return(bm);
}
}