public static void SetOrientation(this VirtualizingLayout layout, ScrollOrientation scrollOrientation)
{
// Note:
// The public properties of UniformGridLayout and FlowLayout interpret orientation the opposite to
// how FlowLayoutAlgorithm interprets it.
// For simplicity, all of our test validation code is written in terms that match the implementation.
// For this reason, we need to switch the orientation whenever we set UniformGridLayout.Orientation
// or StackLayout.Orientation.
if (layout is StackLayout)
{
((StackLayout)layout).Orientation = scrollOrientation.ToLayoutOrientation();
}
else if (layout is UniformGridLayout)
{
((UniformGridLayout)layout).Orientation = scrollOrientation.ToOrthogonalLayoutOrientation();
}
else if (layout is FlowLayout)
{
((FlowLayout)layout).Orientation = scrollOrientation.ToOrthogonalLayoutOrientation();
}
else
{
throw new InvalidOperationException("layout unknown");
}
}
