private ScrollBar GetVerticalScrollBar()
{
// wire up events for the scrollbar
var explorerTreeView = ExplorerTreeView;
var scrollBar = (explorerTreeView == null ? null : ExplorerUtility.FindFirstVerticalScrollBar(explorerTreeView));
// Is cached scrollbar the same as the one in the visual tree?
if (!ReferenceEquals(_vScrollBar, scrollBar))
{
if (_vScrollBar != null)
{
UnhookScrollBarEvents(_vScrollBar);
_vScrollBar = null;
_scrollViewer = null;
}
// wire up events for the scrollbar
_vScrollBar = scrollBar;
if (_vScrollBar != null)
{
_vScrollBar.SizeChanged += VScrollBar_SizeChanged;
_vScrollBar.IsVisibleChanged += VScrollBar_IsVisibleChanged;
_vScrollBar.Unloaded += VScrollBar_Unloaded;
}
}
return(_vScrollBar);
}
