/// <summary>
/// ScrollBar supports 'Move-To-Point' by pre-processes Shift+MouseLeftButton Click.
/// </summary>
/// <param name="e"></param>
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
_thumbOffset = new Vector();
if ((Track != null) &&
(Track.IsMouseOver) &&
((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift))
{
// Move Thumb to the Mouse location
Point pt = e.MouseDevice.GetPosition((IInputElement)Track);
double newValue = Track.ValueFromPoint(pt);
if (System.Windows.Shapes.Shape.IsDoubleFinite(newValue))
{
ChangeValue(newValue, false /* defer */);
}
if (Track.Thumb != null && Track.Thumb.IsMouseOver)
{
Point thumbPoint = e.MouseDevice.GetPosition((IInputElement)Track.Thumb);
_thumbOffset = thumbPoint - new Point(Track.Thumb.ActualWidth * 0.5, Track.Thumb.ActualHeight * 0.5);
}
else
{
e.Handled = true;
}
}
base.OnPreviewMouseLeftButtonDown(e);
}
/// <summary>
/// Scroll to the position where ContextMenu was invoked.
/// </summary>
internal void ScrollToLastMousePoint()
{
Point pt = new Point(-1, -1);
if ((Track != null) && (_latestRightButtonClickPoint != pt))
{
double newValue = Track.ValueFromPoint(_latestRightButtonClickPoint);
if (System.Windows.Shapes.Shape.IsDoubleFinite(newValue))
{
ChangeValue(newValue, false /* defer */);
_latestRightButtonClickPoint = pt;
RaiseScrollEvent(ScrollEventType.ThumbPosition);
}
}
}