private static PocoFrame ToPoco(this IFrame source, ConversionContext context)
{
if (source == null) return null;
var poco = source as PocoFrame;
if ((poco != null) || context.GetOrCreate(source, () => new PocoFrame(), out poco))
return poco;
source.CopyTo(poco, nameof(IFrame.FrameChildren), nameof(IFrame.FrameTransitions));
foreach (IFrameItem child in source.FrameChildren)
if (child is IFrameText)
poco.Texts.Add(child as PocoFrameText ?? ((IFrameText) child).ToPoco(context));
else if (child is IFrameImage)
poco.Images.Add(child as PocoFrameImage ?? ((IFrameImage) child).ToPoco(context));
else if (child is IFrameVideo)
poco.Videos.Add(child as PocoFrameVideo ?? ((IFrameVideo) child).ToPoco(context));
else if (child is IFrame)
poco.Frames.Add(child as PocoFrame ?? ((IFrame) child).ToPoco(context));
return poco;
}