77 lines
2.6 KiB
C#
77 lines
2.6 KiB
C#
using Microsoft.AspNetCore.Mvc.Rendering;
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using Microsoft.AspNetCore.Mvc.ViewFeatures;
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using Microsoft.AspNetCore.Razor.TagHelpers;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.Options;
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namespace zero.TagHelpers;
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[HtmlTargetElement("app-icon", TagStructure = TagStructure.NormalOrSelfClosing)]
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public class IconTagHelper : TagHelper
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{
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public string Symbol { get; set; }
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public int Size { get; set; } = -1;
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public decimal Stroke { get; set; } = -1;
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public string Class { get; set; }
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[HtmlAttributeNotBound]
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[ViewContext]
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public ViewContext ViewContext { get; set; } = default!;
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private IconOptions _options;
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private IFileVersionProvider _fileVersionProvider;
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private readonly ILogger<IconTagHelper> _logger;
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public IconTagHelper(IOptionsMonitor<IconOptions> options, ILogger<IconTagHelper> logger, IFileVersionProvider fileVersionProvider)
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{
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_options = options.CurrentValue;
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_logger = logger;
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_fileVersionProvider = fileVersionProvider;
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options.OnChange(val => _options = val);
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}
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public override void Process(TagHelperContext context, TagHelperOutput output)
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{
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if (_options.Path.IsNullOrWhiteSpace())
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{
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_logger.LogWarning("Could not render <app-icon />. Please configure the path with IconOptions before.");
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output.SuppressOutput();
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return;
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}
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int size = Size < 0 ? _options.DefaultSize : Size;
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string stroke = (Stroke < 0 ? _options.DefaultStrokeWidth : Stroke).ToString().Replace(',', '.');
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output.TagName = "svg";
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output.Attributes.SetAttribute("class", Class.HasValue() ? $"{_options.CssClass} {Class}" : _options.CssClass);
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output.Attributes.SetAttribute("width", size);
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output.Attributes.SetAttribute("height", size);
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output.Attributes.SetAttribute("xmlns", "http://www.w3.org/2000/svg");
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output.Attributes.SetAttribute("stroke-width", stroke);
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output.Attributes.SetAttribute("data-symbol", Symbol);
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output.Content.SetHtmlContent(BuildIcon(Symbol, size, stroke));
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}
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public string BuildIcon(string symbol, int size = 18, string stroke = "2", string classes = null, bool withSvg = false)
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{
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string path = _fileVersionProvider.AddFileVersionToPath(ViewContext.HttpContext.Request.PathBase, _options.Path);
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string inner = $"<use xlink:href='{path}#{symbol}\'></use>";
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if (!withSvg)
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{
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return inner;
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}
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return $"<svg class='{_options.CssClass}{(classes.HasValue() ? " " + classes : string.Empty)}' width='{size}' height='{size}'" +
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$"xmlns='http://www.w3.org/2000/svg' stroke-width='{stroke}' data-symbol='{symbol}'>{inner}</svg>";
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}
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} |