/// <summary>
/// Creates a reference to the sprite / inlined version of the desired image including special attributes.
/// </summary>
/// <param name="virtualPath">The relative path of the image to be displayed</param>
/// <param name="htmlAttributes">Html Attributes of IDictionary form</param>
/// <returns>Image tag.</returns>
public static IHtmlString Image(string virtualPath, IDictionary <string, object> htmlAttributes)
{
ImageOptimizations.EnsureInitialized();
TagBuilder htmlTag = new TagBuilder("img");
htmlTag.MergeAttributes(htmlAttributes);
HttpContextBase httpContext = new HttpContextWrapper(HttpContext.Current);
if (ImageOptimizations.LinkCompatibleCssFile(httpContext.Request.Browser) == null)
{
htmlTag.MergeAttribute("src", ResolveUrl(virtualPath));
return(new HtmlString(htmlTag.ToString(TagRenderMode.SelfClosing)));
}
else
{
htmlTag.AddCssClass(ImageOptimizations.MakeCssClassName(virtualPath));
htmlTag.MergeAttribute("src", ResolveUrl(ImageOptimizations.GetBlankImageSource(httpContext.Request.Browser)));
return(new HtmlString(htmlTag.ToString(TagRenderMode.SelfClosing)));
}
}
protected override void OnPreRender(EventArgs e)
{
if (PrepareSpriteRendering())
{
string spriteDirectoryPath = Path.GetDirectoryName(ImageUrl);
string spriteCssClassName = ImageOptimizations.MakeCssClassName(ImageUrl);
if (CssClass.Length != 0)
{
CssClass = spriteCssClassName + " " + CssClass;
}
else
{
CssClass = spriteCssClassName;
}
ImageSpriteCssLink.AddCssToPage(Page, Path.Combine(spriteDirectoryPath, _cssFileName));
_usingSprites = true;
}
base.OnPreRender(e);
}
