/// <summary>
/// Generates an IMG tag for an inline image.
/// </summary>
/// <param name="htmlHelper">HTML helper.</param>
/// <param name="image">Inline image.</param>
/// <param name="sizes">Media conditions mapping screen width to image size</param>
public static MvcHtmlString InlineImage(this HtmlHelper htmlHelper, IInlineImage image, ResponsiveImageSizes sizes = null)
{
if (image == null)
{
return(MvcHtmlString.Empty);
}
var imageTag = new TagBuilder("img");
if (AppSettingProvider.ResponsiveImagesEnabled)
{
imageTag.MergeAttribute("srcset", GenerateSrcsetValue(image.Src));
if (sizes != null)
{
imageTag.MergeAttribute("sizes", sizes.GenerateSizesValue());
}
}
imageTag.MergeAttribute("src", image.Src);
imageTag.MergeAttribute("alt", image.AltText);
return(MvcHtmlString.Create(imageTag.ToString(TagRenderMode.SelfClosing)));
}
/// <summary>
/// Generates an IMG tag for an inline image.
/// </summary>
/// <param name="htmlHelper">HTML helper.</param>
/// <param name="image">Inline image.</param>
/// <param name="sizes">Media conditions mapping screen width to image size</param>
public static IHtmlContent InlineImage(this IHtmlHelper htmlHelper, IConfiguration configuration, IInlineImage image, ResponsiveImageSizes sizes = null)
{
if (image == null)
{
return(new HtmlString(string.Empty));
}
var imageTag = new TagBuilder("img");
bool responsiveImagesEnabled = configuration.GetSection(nameof(AppConfiguration)).Get <AppConfiguration>().ResponsiveImagesEnabled;
if (responsiveImagesEnabled)
{
imageTag.MergeAttribute("srcset", GenerateSrcsetValue(image.Src, configuration));
if (sizes != null)
{
imageTag.MergeAttribute("sizes", sizes.GenerateSizesValue());
}
}
imageTag.MergeAttribute("src", image.Src);
imageTag.MergeAttribute("alt", image.AltText);
imageTag.TagRenderMode = TagRenderMode.SelfClosing;
string result;
using (var writer = new StringWriter())
{
imageTag.WriteTo(writer, HtmlEncoder.Default);
result = writer.ToString();
}
return(new HtmlString(result));
}
/// <summary>
/// Generates an IMG tag for an image file.
/// </summary>
/// <param name="htmlHelper">HTML helper.</param>
/// <param name="asset">Asset</param>
/// <param name="title">Title</param>
/// <param name="cssClass">CSS class</param>
/// <param name="width">Optional width size</param>
/// <param name="height">Optional height size</param>
/// <param name="sizes">Media conditions mapping screen width to image size</param>
public static MvcHtmlString AssetImage(this HtmlHelper htmlHelper, Asset asset, string title = null, string cssClass = "", int?width = null, int?height = null, ResponsiveImageSizes sizes = null)
{
if (asset == null)
{
return(MvcHtmlString.Empty);
}
var imageUrlBuilder = new ImageUrlBuilder(asset.Url);
var image = new TagBuilder("img");
if (width.HasValue)
{
image.MergeAttribute("width", width.ToString());
imageUrlBuilder = imageUrlBuilder.WithWidth(Convert.ToDouble(width));
}
if (height.HasValue)
{
image.MergeAttribute("height", height.ToString());
imageUrlBuilder = imageUrlBuilder.WithHeight(Convert.ToDouble(height));
}
if (AppSettingProvider.ResponsiveImagesEnabled && !width.HasValue && !height.HasValue)
{
image.MergeAttribute("srcset", GenerateSrcsetValue(asset.Url));
if (sizes != null)
{
image.MergeAttribute("sizes", sizes.GenerateSizesValue());
}
}
image.MergeAttribute("src", $"{imageUrlBuilder.Url}");
image.AddCssClass(cssClass);
string titleToUse = title ?? asset.Description ?? string.Empty;
image.MergeAttribute("alt", titleToUse);
image.MergeAttribute("title", titleToUse);
return(MvcHtmlString.Create(image.ToString(TagRenderMode.SelfClosing)));
}
/// <summary>
/// Generates an IMG tag for an image file.
/// </summary>
/// <remarks>Should replace it with the asp.net core's img TagHelper in each view</remarks>
/// <param name="htmlHelper">HTML helper.</param>
/// <param name="asset">Asset</param>
/// <param name="title">Title</param>
/// <param name="cssClass">CSS class</param>
/// <param name="width">Optional width size</param>
/// <param name="height">Optional height size</param>
/// <param name="sizes">Media conditions mapping screen width to image size</param>
public static IHtmlContent AssetImage(this IHtmlHelper htmlHelper, IConfiguration configuration, Asset asset, string title = null, string cssClass = "", int?width = null, int?height = null, ResponsiveImageSizes sizes = null)
{
if (asset == null)
{
return(new HtmlString(string.Empty));
}
var imageUrlBuilder = new ImageUrlBuilder(asset.Url);
var image = new TagBuilder("img");
if (width.HasValue)
{
image.MergeAttribute("width", width.ToString());
imageUrlBuilder = imageUrlBuilder.WithWidth(Convert.ToDouble(width));
}
if (height.HasValue)
{
image.MergeAttribute("height", height.ToString());
imageUrlBuilder = imageUrlBuilder.WithHeight(Convert.ToDouble(height));
}
bool responsiveImagesEnabled = configuration.GetSection(nameof(AppConfiguration)).Get <AppConfiguration>().ResponsiveImagesEnabled;
if (responsiveImagesEnabled && !width.HasValue && !height.HasValue)
{
image.MergeAttribute("srcset", GenerateSrcsetValue(asset.Url, configuration));
if (sizes != null)
{
image.MergeAttribute("sizes", sizes.GenerateSizesValue());
}
}
image.MergeAttribute("src", $"{imageUrlBuilder.Url}");
image.AddCssClass(cssClass);
string titleToUse = title ?? asset.Description ?? string.Empty;
image.MergeAttribute("alt", titleToUse);
image.MergeAttribute("title", titleToUse);
image.TagRenderMode = TagRenderMode.SelfClosing;
string result;
using (var writer = new StringWriter())
{
image.WriteTo(writer, HtmlEncoder.Default);
result = writer.ToString();
}
return(new HtmlString(result));
}