iOS: Compute Position for Widget that accounts for zoom scale

compute_position_for_widget.m

- (CGRect)computePositionForWidget:(UIView *)widgetView fromView:(UIScrollView *)scrollView
{
    CGRect frame;
    float  scale;

    scale = scrollView.zoomScale;

    // compute the widget size based on the zoom scale
    frame.size.width  = widgetView.frame.size.width  * scale;
    frame.size.height = widgetView.frame.size.height * scale;

    // compute the widget position based on the zoom scale and contentOffset
    frame.origin.x = widgetView.frame.origin.x * scale - scrollView.contentOffset.x + scrollView.frame.origin.x;
    frame.origin.y = widgetView.frame.origin.y * scale - scrollView.contentOffset.y + scrollView.frame.origin.y;

    // return the widget coordinates in the coordinate system of the view that contains the scroll view
    return( frame );
}