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using MyEpiSite.Business.Rendering; | |
using System.Configuration; | |
using System.Web; | |
using System.Web.Mvc; | |
namespace MyEpiSite.Helpers | |
{ | |
public static class PictureHelper | |
{ | |
public static IHtmlString Picture(this HtmlHelper helper, string imageUrl, ImageType imageType, string cssClass = "") | |
{ | |
//create picture element | |
var pictureElement = new TagBuilder("picture"); | |
if (imageType.SrcSetWidths != null) | |
{ | |
//add source element to picture element | |
var sourceElement = GetSourceElement(imageUrl, imageType); | |
pictureElement.InnerHtml += sourceElement.ToString(TagRenderMode.SelfClosing); | |
} | |
//create img element | |
var imgElement = new TagBuilder("img"); | |
imgElement.Attributes.Add("src", imageUrl + GetQueryString(imageType.DefaultImgWidth)); | |
if (!string.IsNullOrEmpty(cssClass)) | |
{ | |
imgElement.Attributes.Add("class", cssClass); | |
} | |
//add img element to picture element | |
pictureElement.InnerHtml += imgElement.ToString(TagRenderMode.SelfClosing); | |
return new MvcHtmlString(pictureElement.ToString()); | |
} | |
private static TagBuilder GetSourceElement(string imageUrl, ImageType imageType) | |
{ | |
var sourceElement = new TagBuilder("source"); | |
//add srcset attribute | |
var srcset = string.Empty; | |
foreach (var width in imageType.SrcSetWidths) | |
{ | |
srcset += imageUrl + GetQueryString(width) + " " + width + "w, "; | |
} | |
sourceElement.Attributes.Add("srcset", srcset); | |
//add sizes attribute | |
var sizes = string.Empty; | |
foreach (var size in imageType.SrcSetSizes) | |
{ | |
sizes += size + ", "; | |
} | |
sourceElement.Attributes.Add("sizes", sizes); | |
return sourceElement; | |
} | |
private static string GetQueryString(int? imageWidth) | |
{ | |
var qs = "?width=" + imageWidth; | |
//check appsetting if debug-info should be printed on image | |
bool.TryParse(ConfigurationManager.AppSettings["ImageProcessorDebug"], out var showDebugInfo); | |
if (showDebugInfo) | |
{ | |
qs += $"&watermark=width:%20{imageWidth}&color=FF2D31&fontsize=40&textposition={imageWidth / 2 - 80},100"; | |
} | |
return qs; | |
} | |
} | |
} |
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