125 lines
3.4 KiB
C#
125 lines
3.4 KiB
C#
// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Globalization;
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using System.IO;
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using System.Web.UI;
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namespace System.Web.Helpers
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{
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internal class HtmlElement
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{
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public HtmlElement(string tagName)
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{
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TagName = tagName;
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Attributes = new Dictionary<string, string>();
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Children = new List<HtmlElement>();
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}
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internal string TagName { get; set; }
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internal string InnerText { get; set; }
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public IList<HtmlElement> Children { get; set; }
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private IDictionary<string, string> Attributes { get; set; }
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[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Justification = "It is there for completeness")]
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public string this[string name]
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{
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get { return Attributes[name]; }
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set { MergeAttribute(name, value); }
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}
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public HtmlElement SetInnerText(string innerText)
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{
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InnerText = innerText;
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Children.Clear();
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return this;
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}
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public HtmlElement AppendChild(HtmlElement e)
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{
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Children.Add(e);
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return this;
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}
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public HtmlElement AppendChild(string innerText)
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{
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AppendChild(CreateSpan(innerText));
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return this;
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}
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private void MergeAttribute(string name, string value)
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{
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Attributes[name] = value;
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}
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public HtmlElement AddCssClass(string className)
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{
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string currentValue;
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if (!Attributes.TryGetValue("class", out currentValue))
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{
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Attributes["class"] = className;
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}
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else
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{
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Attributes["class"] = currentValue + " " + className;
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}
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return this;
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}
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public IHtmlString ToHtmlString()
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{
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using (StringWriter sw = new StringWriter(CultureInfo.InvariantCulture))
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{
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WriteTo(sw);
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return new HtmlString(sw.ToString());
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}
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}
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public void WriteTo(TextWriter writer)
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{
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WriteToInternal(new HtmlTextWriter(writer));
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}
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private void WriteToInternal(HtmlTextWriter writer)
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{
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foreach (var a in Attributes)
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{
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writer.AddAttribute(a.Key, a.Value, true);
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}
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writer.RenderBeginTag(TagName);
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if (!String.IsNullOrEmpty(InnerText))
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{
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writer.WriteEncodedText(InnerText);
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}
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else
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{
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foreach (var e in Children)
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{
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e.WriteToInternal(writer);
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}
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}
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writer.RenderEndTag();
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}
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public override string ToString()
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{
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return ToHtmlString().ToString();
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}
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internal static HtmlElement CreateSpan(string innerText, string cssClass = null)
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{
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var span = new HtmlElement("span");
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span.SetInnerText(innerText);
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if (!String.IsNullOrEmpty(cssClass))
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{
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span.AddCssClass(cssClass);
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}
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return span;
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}
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}
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}
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