private void OnPreviewMouseMove(object sender, MouseEventArgs e)
{
var self = ((FrameworkElement)sender).GetParent <ScrollViewer>();
Debug.Assert(self != null);
var pos = e.GetPosition(self);
var posX = pos.X;
var posY = pos.Y;
var width = (1.0, self.ActualWidth - BarWidth).Max();
var height = (1.0, self.ActualHeight - BarWidth).Max();
if (ScrollViewerAttachedProperties.GetIsLeftVerticalScrollBar(self))
{
posX = width - posX;
}
var xr = (Response, width).Min();
var yr = (Response, height).Min();
var xir = width - xr;
var yir = height - yr;
var xd = NumberHelper.Clamp01((posX - xir) / xr);
var yd = NumberHelper.Clamp01((posY - yir) / yr);
var xo = xd * MaxOpacity;
var yo = yd * MaxOpacity;
ScrollViewerAttachedProperties.SetVerticalScrollBarOpacity(self, xo);
ScrollViewerAttachedProperties.SetHorizontalScrollBarOpacity(self, yo);
}
private void OnMouseLeave(object sender, MouseEventArgs e)
{
var self = ((FrameworkElement)sender).GetParent <ScrollViewer>();
Debug.Assert(self != null);
ScrollViewerAttachedProperties.SetVerticalScrollBarOpacity(self, 0.0);
ScrollViewerAttachedProperties.SetHorizontalScrollBarOpacity(self, 0.0);
}