func scrollViewDidZoom()

in AzureCommunicationUI/sdk/AzureCommunicationUICalling/Sources/Presentation/SwiftUI/Calling/Grid/Cell/ZoomableVideoRenderView.swift [125:166]
33 lines of code
8 McCabe index (conditional complexity)

        func scrollViewDidZoom(_ scrollView: UIScrollView) {
            let initialMinZoomScale = InitialZoomScaleConstants.minScale
            let boundedZoomScale = min(scrollView.zoomScale, scrollView.maximumZoomScale) * (1 / initialMinZoomScale)

            if boundedZoomScale > 1 {
                let aspectRatioVideoStream = self.streamSize != .zero ?
                self.streamSize.width / self.streamSize.height : GeneralScreenConstants.defaultAspectRatio

                let spectRatioScrollView = scrollView.bounds.width / scrollView.bounds.height
                let scrollViewHasNarrowAspectRatio = spectRatioScrollView < aspectRatioVideoStream

                var videoContentWidth = scrollView.bounds.width
                var videoContentHeight = videoContentWidth / aspectRatioVideoStream

                if !scrollViewHasNarrowAspectRatio {
                    videoContentHeight = scrollView.bounds.height
                    videoContentWidth = videoContentHeight * aspectRatioVideoStream
                }

                let ratioW = scrollView.frame.width / videoContentWidth
                let ratioH = scrollView.frame.height / videoContentHeight

                let ratio = ratioW < ratioH ? ratioW : ratioH

                let newWidth = videoContentWidth * ratio
                let newHeight = videoContentHeight * ratio

                let left = 0.5 * (newWidth * boundedZoomScale > scrollView.frame.width ?
                                  (newWidth - scrollView.frame.width)
                                  : (scrollView.frame.width - scrollView.contentSize.width))
                let top = 0.5 * (newHeight * boundedZoomScale > scrollView.frame.height ?
                                 (!scrollViewHasNarrowAspectRatio ?
                                  (newHeight - scrollView.frame.height) :
                                    (scrollView.frame.height - scrollView.contentSize.height
                                     + (newHeight * boundedZoomScale - scrollView.frame.height)))
                                 : (scrollView.frame.height - scrollView.contentSize.height))

                scrollView.contentInset = UIEdgeInsets(top: top, left: left, bottom: top, right: left)
            } else {
                scrollView.contentInset = .zero
            }
        }