public static int GetRotationAngle(this ElementOrientations elementOrientation, OrientationOrigins orientationOrigin = OrientationOrigins.Auto)
{
int rotationAngle = 0;
var displayInfo = DisplayInformation.GetForCurrentView();
var currentOrientation = displayInfo.CurrentOrientation;
DisplayOrientations targetOrientation;
switch (orientationOrigin)
{
default:
case OrientationOrigins.Auto:
targetOrientation = currentOrientation;
break;
case OrientationOrigins.Native:
targetOrientation = displayInfo.NativeOrientation;
break;
case OrientationOrigins.AutoRotationPreference:
targetOrientation = DisplayInformation.AutoRotationPreferences;
break;
}
switch (elementOrientation)
{
case ElementOrientations.Auto:
case ElementOrientations.Reverse:
rotationAngle = 0;
break;
case ElementOrientations.Fixed:
case ElementOrientations.ReverseFixed:
if (orientationOrigin == OrientationOrigins.Auto && targetOrientation == currentOrientation)
{
rotationAngle = 0;
}
else
{
rotationAngle = targetOrientation.GetRotationAngle();
rotationAngle += currentOrientation.GetRotationAngle();
}
break;
}
switch (elementOrientation)
{
case ElementOrientations.Reverse:
case ElementOrientations.ReverseFixed:
rotationAngle -= 180;
break;
}
return(rotationAngle);
}
public static void SetElementOrientation(DependencyObject element, ElementOrientations value)
{
(element as FrameworkElement).SetValue(ElementOrientationProperty, value);
}
