private void DownStyleChange(Label label)
{
if (label == null)
{
CollectionStack.SelectItem = CollectionSource.First();
}
else
{
int index = CollectionSource.ToList().IndexOf(label);
if (index != CollectionSource.Count() - 1)
{
int offset = GetScrollViewerOffset();
if (offset + 9 == index)
{
SetScrollViewerOffset(offset + 1);
}
else if (offset > index || offset + 9 < index)
{
SetScrollViewerOffset(index + 1);
}
StyleChange(label);
CollectionStack.SelectItem = CollectionSource.ElementAt(index + 1);
}
}
}
private void SetPopup(Label label)
{
if (label != null)
{
int index = CollectionSource.ToList().IndexOf(label);
int offset = GetScrollViewerOffset();
int interval = index - offset;
ItemPopup.PlacementTarget = window;
ItemPopup.Placement = PlacementMode.Absolute;
ItemPopup.HorizontalOffset = window.Left + 344;
ItemPopup.VerticalOffset = window.Top + 69 + interval * 20;
SetPopupOpen(label);
}
}
private void OnScrollChanged(object sender, ScrollChangedEventArgs e)
{
if (CollectionStack.SelectItem != null)
{
int offset = GetScrollViewerOffset();
int index = CollectionSource.ToList().IndexOf(CollectionStack.SelectItem);
int interval = index - offset;
if (index >= offset && index <= offset + 9)
{
ItemPopup.VerticalOffset = window.Top + 69 + interval * 20;
}
else
{
RemovePopup();
}
}
}
private void UpStyleChange(Label label)
{
if (label != null)
{
int index = CollectionSource.ToList().IndexOf(label);
if (index != 0)
{
int offset = GetScrollViewerOffset();
if (offset == index)
{
SetScrollViewerOffset(offset - 1);
}
else if (offset > index || offset + 9 < index)
{
SetScrollViewerOffset(index - 1);
}
StyleChange(label);
CollectionStack.SelectItem = CollectionSource.ElementAt(index - 1);
}
}
}