public static MvcHtmlString ResizedPicture(this HtmlHelper helper,
ContentReference image,
PictureProfile profile,
string fallbackUrl = null,
ResizedPictureViewModel pictureModel = null)
{
if (pictureModel == null)
{
pictureModel = new ResizedPictureViewModel();
}
var imageFound = ServiceLocator.Current.GetInstance <IContentLoader>()
.TryGet <IContentData>(image, new LoaderOptions {
LanguageLoaderOption.FallbackWithMaster()
},
out var content) &&
content is IImage;
var baseUrl = imageFound
? ResolveImageUrl(image)
: fallbackUrl;
if (!pictureModel.ImgElementAttributes.ContainsKey("alt"))
{
var alternateText = imageFound
? ((IImage)content).Description
: string.Empty;
pictureModel.ImgElementAttributes.Add("alt", alternateText);
}
return(GenerateResizedPicture(baseUrl, profile, content as IResponsiveImage, pictureModel));
}
private static MvcHtmlString GeneratePictureElement(PictureProfile profile,
string imgUrl,
IResponsiveImage focalPoint, ResizedPictureViewModel pictureModel)
{
var sourceElements = profile.Sources?.Select(x => CreateSourceElement(imgUrl, x, focalPoint,
profile.MaxImageDimension, profile.Format));
var pictureElement = new TagBuilder("picture")
{
InnerHtml =
string.Join(string.Empty,
sourceElements?.Select(x => x.ToString(TagRenderMode.SelfClosing)) ?? new string[0]) +
CreateImgElement(
BuildResizedImageUrl(imgUrl, profile.DefaultWidth, ScaleMode.Default, AspectRatio.Original,
null, focalPoint, null, profile.Format).ToString(), pictureModel.ImgElementAttributes)
.ToString(TagRenderMode.SelfClosing)
};
foreach (var kv in pictureModel.PictureElementAttributes)
{
pictureElement.Attributes.Add(kv.Key, kv.Value);
}
return(new MvcHtmlString(pictureElement.ToString()));
}
private static MvcHtmlString GenerateResizedPicture(string imageBaseUrl,
PictureProfile profile, IResponsiveImage image, ResizedPictureViewModel pictureModel)
{
return(GeneratePictureElement(profile, imageBaseUrl, image, pictureModel));
}