public override void ViewWillTransitionToSize (CGSize toSize, IUIViewControllerTransitionCoordinator coordinator)
{
base.ViewWillTransitionToSize (toSize, coordinator);
var videoPreviewLayerConnection = PreviewView.VideoPreviewLayer.Connection;
if (videoPreviewLayerConnection != null) {
var deviceOrientation = UIDevice.CurrentDevice.Orientation;
if (!deviceOrientation.IsPortrait () && !deviceOrientation.IsLandscape ())
return;
var newVideoOrientation = VideoOrientationFor (deviceOrientation);
var oldSize = View.Frame.Size;
var oldVideoOrientation = videoPreviewLayerConnection.VideoOrientation;
videoPreviewLayerConnection.VideoOrientation = newVideoOrientation;
// When we transition to the new size, we need to adjust the region
// of interest's origin and size so that it stays anchored relative
// to the camera.
coordinator.AnimateAlongsideTransition (context => {
var oldRegion = PreviewView.RegionOfInterest;
var newRegion = new CGRect ();
if (oldVideoOrientation == LandscapeRight && newVideoOrientation == LandscapeLeft) {
newRegion = oldRegion.WithX (oldSize.Width - oldRegion.X - oldRegion.Width);
} else if (oldVideoOrientation == LandscapeRight && newVideoOrientation == Portrait) {
newRegion.X = toSize.Width - oldRegion.Y - oldRegion.Height;
newRegion.Y = oldRegion.X;
newRegion.Width = oldRegion.Height;
newRegion.Height = oldRegion.Width;
} else if (oldVideoOrientation == LandscapeLeft && newVideoOrientation == LandscapeRight) {
newRegion = oldRegion.WithX (oldSize.Width - oldRegion.X - oldRegion.Width);
} else if (oldVideoOrientation == LandscapeLeft && newVideoOrientation == Portrait) {
newRegion.X = oldRegion.Y;
newRegion.Y = oldSize.Width - oldRegion.X - oldRegion.Width;
newRegion.Width = oldRegion.Height;
newRegion.Height = oldRegion.Width;
} else if (oldVideoOrientation == Portrait && newVideoOrientation == LandscapeRight) {
newRegion.X = oldRegion.Y;
newRegion.Y = toSize.Height - oldRegion.X - oldRegion.Width;
newRegion.Width = oldRegion.Height;
newRegion.Height = oldRegion.Width;
} else if (oldVideoOrientation == Portrait && newVideoOrientation == LandscapeLeft) {
newRegion.X = oldSize.Height - oldRegion.Y - oldRegion.Height;
newRegion.Y = oldRegion.X;
newRegion.Width = oldRegion.Height;
newRegion.Height = oldRegion.Width;
}
PreviewView.SetRegionOfInterestWithProposedRegionOfInterest (newRegion);
}, context => {
sessionQueue.DispatchAsync (() => {
metadataOutput.RectOfInterest = PreviewView.VideoPreviewLayer.MapToLayerCoordinates (PreviewView.RegionOfInterest);
});
// Remove the old metadata object overlays.
RemoveMetadataObjectOverlayLayers ();
});
}
}
