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);
}
private void RadListViewItem_SizeChanged(object sender, Windows.UI.Xaml.SizeChangedEventArgs e)
{
var aritmetics = new DoubleArithmetics(1);
if (!aritmetics.AreClose(e.PreviousSize, e.NewSize) && !this.isReordering)
{
this.Owner.UpdateService.RegisterUpdate(new DelegateUpdate <UpdateFlags>(() => this.ListView.contentPanel.InvalidateMeasure()));
this.needUpdate = false;
}
}
internal bool IsColumnIndexInView(ScrollIntoViewOperation <int> operation)
{
var column = this.ColumnPool.GetDisplayedElement(operation.RequestedItem);
if (column == null)
{
return(false);
}
// Since the headers are not part of the scrollviewer we need to compare their position to the viewport window and omit the scroll offset.
return(DoubleArithmetics.Ceiling(column.LayoutSlot.X) >= 0 &&
DoubleArithmetics.IsLessThanOrEqual(column.LayoutSlot.X + column.layoutSlot.Width, this.View.ViewportWidth));
}
internal bool IsIndexInView(ScrollIntoViewOperation <int> operation)
{
var layoutSlot = this.RowPool.GetPreviousDisplayedLayoutSlot(operation.RequestedItem);
if (layoutSlot == RadRect.Invalid)
{
return(false);
}
var frozenContainersLength = Math.Max(0, this.RowPool.FrozenContainersLength);
return(DoubleArithmetics.IsGreaterThanOrEqual(layoutSlot.Y, this.PhysicalVerticalOffset + frozenContainersLength) &&
DoubleArithmetics.IsLessThanOrEqual(layoutSlot.Y + layoutSlot.Height, this.PhysicalVerticalOffset + this.View.ViewportHeight));
}
