sidebar shadow fix

sidebarshadow.m

- (void)moveMainViewToPosition:(CGFloat)position
{
    [self moveShadowForViewAtPosition:position];
    
    CGRect frame = self.mainView.frame;
    frame.origin.x = position;
    self.mainView.frame = frame;
    
}

...


- (CGFloat)shadowPositionForMainViewPosition:(CGFloat)mainViewPosition
{
    BOOL isLeftSide = (self.mainView.frame.origin.x > 0);
    
    if (isLeftSide)
        return mainViewPosition - self.shadowView.frame.size.width;
    else
        return screenWidth() + mainViewPosition;
}

- (CGAffineTransform)shadowTransformForMainViewPosition:(CGFloat)mainViewPosition
{
    BOOL isLeftSide = (self.mainView.frame.origin.x > 0);
    
    if (isLeftSide)
        return CGAffineTransformIdentity;
    else
        return CGAffineTransformMakeScale(-1, 1);
}