public ItemStop(StartViewItem item, int position)
{
Item = item;
Position = position;
}
internal void GetSnapOffset(int offset, int viewportWidth, int direction, out int snapTo, out int newDirection, out StartViewItem newSelection)
{
int snapThreshold = viewportWidth / SnapThresholdDivisor;
snapTo = offset;
newDirection = direction;
newSelection = _selectedItem;
if (VisibleChildren.Count == 0)
{
return;
}
foreach (ItemStop itemStop in _itemStops)
{
if (itemStop.Position == -offset)
{
newSelection = itemStop.Item;
return;
}
}
int leftIndex;
int leftInView;
int centerIndex;
int rightIndex;
int rightInView;
GetItemsInView(offset, viewportWidth, out leftIndex, out leftInView, out centerIndex, out rightIndex, out rightInView);
if (leftIndex == rightIndex && leftIndex != -1)
{
newSelection = _selectedItem = _visibleChildren[leftIndex];
}
else
{
if (leftIndex == -1)
{
leftIndex = _visibleChildren.Count - 1;
}
if (rightIndex == -1)
{
rightIndex = 0;
}
int index;
if (direction < 0)
{
if (rightInView > snapThreshold)
{
index = GetBestIndex(centerIndex, rightIndex, leftIndex);
newDirection = -1;
}
else
{
index = GetBestIndex(leftIndex, centerIndex, rightIndex);
newDirection = 1;
}
}
else if (direction > 0)
{
if (leftInView > snapThreshold)
{
index = StartViewPanel.GetBestIndex(leftIndex, centerIndex, rightIndex);
newDirection = 1;
}
else
{
index = StartViewPanel.GetBestIndex(centerIndex, rightIndex, leftIndex);
newDirection = -1;
}
}
else if (centerIndex != -1)
{
index = centerIndex;
newDirection = -1;
}
else if (leftInView > rightInView)
{
index = leftIndex;
newDirection = -1;
}
else
{
index = rightIndex;
newDirection = 1;
}
_selectedItem = _visibleChildren[index];
snapTo = -_selectedItem.StartPosition;
newSelection = _selectedItem;
}
}
