internal void ScrollIndexIntoView(ScrollIntoViewOperation <int> operation)
{
var index = operation.RequestedItem;
var frozenContainersLength = Math.Max(0, this.RowPool.FrozenContainersLength);
var itemLength = this.rowLayout.RenderInfo.ValueForIndex(index);
var offsetToScroll = this.rowLayout.RenderInfo.OffsetFromIndex(index) - itemLength;
if (DoubleArithmetics.IsLessThan(operation.InitialScrollOffset + frozenContainersLength, offsetToScroll))
{
if (index > 0)
{
offsetToScroll -= this.View.ViewportHeight;
offsetToScroll += itemLength;
}
}
else if (DoubleArithmetics.IsLessThanOrEqual(offsetToScroll, operation.InitialScrollOffset + frozenContainersLength))
{
offsetToScroll -= frozenContainersLength;
}
var scrollPosition = new RadPoint(this.PhysicalHorizontalOffset, Math.Max(0, offsetToScroll));
this.GridView.SetScrollPosition(scrollPosition, true, true);
}
internal void ScrollIndexIntoView(ScrollIntoViewOperation <ItemInfo?> operation)
{
var index = operation.RequestedItem.Value.Slot;
var frozenContainersLength = 0;
var itemLength = this.layoutController.strategy.Layout.PhysicalLengthForSlot(index);
var offsetToScroll = this.layoutController.strategy.Layout.PhysicalOffsetFromSlot(index) - itemLength;
if (DoubleArithmetics.IsLessThan(operation.InitialScrollOffset + frozenContainersLength, offsetToScroll))
{
if (index > 0)
{
offsetToScroll -= this.View.Orientation == Orientation.Vertical ? this.View.ViewportHeight : this.View.ViewportWidth;
offsetToScroll += itemLength;
}
}
else if (DoubleArithmetics.IsLessThanOrEqual(offsetToScroll, operation.InitialScrollOffset + frozenContainersLength))
{
offsetToScroll -= frozenContainersLength;
}
var scrollPosition = this.View.Orientation == Orientation.Vertical ? new RadPoint(this.View.ScrollOffset, Math.Max(0, offsetToScroll)) : new RadPoint(Math.Max(0, offsetToScroll), this.View.ScrollOffset);
this.View.SetScrollPosition(scrollPosition, true, true);
}