/// <summary>
/// Scrolls to item with specifid index.
/// </summary>
/// <param name="index">Index.</param>
protected override void ScrollTo(int index)
{
if (!CanOptimize())
{
return;
}
var first_visible = GetFirstVisibleIndex(true);
var last_visible = GetLastVisibleIndex(true);
if (first_visible > index)
{
var item_starts = index * GetItemSize();
SetScrollValue(item_starts);
}
else if (last_visible < index)
{
var margin = (IsHorizontal()) ? layout.GetMarginLeft() : layout.GetMarginTop();
var item_ends = (index + 1) * GetItemSize() - GetItemSpacing() + margin - GetScrollSize();
SetScrollValue(item_ends);
}
}
/// <summary>
/// Gets the left or top margin.
/// </summary>
/// <returns>The margin.</returns>
public float GetMargin()
{
return(IsHorizontal ? Layout.GetMarginLeft() : Layout.GetMarginTop());
}
/// <summary>
/// Gets the item position bottom.
/// </summary>
/// <returns>The item position bottom.</returns>
/// <param name="index">Index.</param>
protected virtual float GetItemPositionBottom(int index)
{
var margin = (IsHorizontal()) ? layout.GetMarginLeft() : layout.GetMarginTop();
return(GetItemPosition(index) + GetItemSize() - GetItemSpacing() + margin - GetScrollSize());
}