/// <summary>
/// Handles notifications when the dragging of the thumb starts.
/// </summary>
/// <param name="sender">the sender object</param>
/// <param name="e">the event arguments</param>
private void ResizeThumbDragStarted(object sender, DragStartedEventArgs e)
{
_designerItem = DataContext as DesignerItem;
if (_designerItem == null)
{
return;
}
_designerItem.IsResizing = true;
_designerItem.IsDragging = true;
_designerItems = _designerItem.GetItemsControl();
_transformOrigin = _designerItem.RenderTransformOrigin;
var rotateTransform = _designerItem.RenderTransform as RotateTransform;
if (rotateTransform != null)
{
_angle = rotateTransform.Angle * Math.PI / 180.0;
}
else
{
_angle = 0.0;
}
}