public static Task NavigateToEndAsync <T>(this IPagination <T> @this)
{
if (@this == null)
{
throw new ArgumentNullException(nameof(@this));
}
return(@this.NavigateToAsync(@this.Count - 1));
}
public static Task NavigateAsync <T>(this IPagination <T> @this, int offset, NavigationOrigin origin = NavigationOrigin.Current, NavigationDirection direction = NavigationDirection.Forward)
{
if (@this == null)
{
throw new ArgumentNullException(nameof(@this));
}
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
int offsetStart;
switch (origin)
{
case NavigationOrigin.Start:
offsetStart = 0;
break;
case NavigationOrigin.Current:
offsetStart = @this.CurrentIndex;
break;
case NavigationOrigin.End:
offsetStart = @this.Count - 1;
break;
default:
throw new ArgumentOutOfRangeException(nameof(origin), origin, null);
}
if (direction == NavigationDirection.Backward)
{
offset *= -1;
}
return(@this.NavigateToAsync(offsetStart + offset));
}
