internal void ScrollToMakeVisible(ExplorerTreeViewItem treeViewItem)
{
if (null == treeViewItem)
{
Debug.Assert(false, "ScrollToMakeVisible: should not be passed null ExplorerTreeViewItem");
return;
}
// select item and scroll so that it is visible
treeViewItem.IsSelected = true;
if (ScrollViewer != null)
{
var y = GetY(treeViewItem);
var viewPortHeight = ScrollViewer.ViewportHeight;
if (Math.Abs(ScrollViewer.VerticalOffset + viewPortHeight / 2 - y) > viewPortHeight / 2)
{
// bring to view and center vertically
ScrollViewer.ScrollToVerticalOffset(y - viewPortHeight / 2);
}
var partHeader = ExplorerUtility.GetTreeViewItemPartHeader(treeViewItem);
if (partHeader != null)
{
// bring to view horizontally and maximize visible width
var x = partHeader.TranslatePoint(new Point(0, 0), ExplorerTreeRoot).X;
var width = partHeader.DesiredSize.Width;
var viewPortWidth = ScrollViewer.ViewportWidth;
var horizontalOffset = ScrollViewer.HorizontalOffset;
if ((horizontalOffset > x) ||
((x + width) > (horizontalOffset + viewPortWidth)))
{
ScrollViewer.ScrollToHorizontalOffset(x);
}
}
}
}
