StyleSheetList.cs :  » GUI » SharpVectorGraphics » SharpVectors » Dom » Stylesheets » C# / CSharp Open Source

using System;
using System.Xml;
using System.Collections;
using System.Diagnostics;
using System.Text.RegularExpressions;
using SharpVectors.Dom.Css;

namespace SharpVectors.Dom.Stylesheets{
  /// <summary>
  /// The StyleSheetList interface provides the abstraction of an ordered collection of style sheets.
  /// The items in the StyleSheetList are accessible via an integral index, starting from 0.
  /// </summary>
  /// <developer>niklas@protocol7.com</developer>
  /// <completed>80</completed>
  public class StyleSheetList : IStyleSheetList
  {
    #region Constructors
    internal StyleSheetList(CssXmlDocument document)
    {
      doc = document;
      XmlNodeList pis = document.SelectNodes("/processing-instruction()");
      styleSheets = new ArrayList();

      foreach(XmlProcessingInstruction pi in pis)
      {
        if(Regex.IsMatch(pi.Data, "type=[\"']text\\/css[\"']"))
        {
          styleSheets.Add(new CssStyleSheet(pi, CssStyleSheetType.Author));
        }
        else
        {
          styleSheets.Add(new StyleSheet(pi));
        }

      }

      XmlNodeList styleNodes;
      foreach(string[] name in document.styleElements)
      {
        styleNodes = document.SelectNodes(
          "//*[local-name()='" + name[1] + "' and namespace-uri()='" + name[0] + "'][@type='text/css']");
        foreach(XmlElement elm in styleNodes)
        {
                    styleSheets.Add(new CssStyleSheet(elm, CssStyleSheetType.Author));
        }
      }
    }
    #endregion

    #region Private fields
    private ArrayList styleSheets;
    private CssXmlDocument doc;
    #endregion

    #region Public methods
    public void AddCssStyleSheet(CssStyleSheet ss)
    {
      styleSheets.Add(ss);
    }

    /// <summary>
    /// Used to find matching style rules in the cascading order
    /// </summary>
    /// <param name="elt">The element to find styles for</param>
    /// <param name="pseudoElt">The pseudo-element to find styles for</param>
    /// <param name="csd">A CssStyleDeclaration that holds the collected styles</param>
    public void GetStylesForElement(XmlElement elt, string pseudoElt, CssCollectedStyleDeclaration csd)
    {
      GetStylesForElement(elt, pseudoElt, csd, doc.Media);
    }

    /// <summary>
    /// Used to find matching style rules in the cascading order
    /// </summary>
    /// <param name="elt">The element to find styles for</param>
    /// <param name="pseudoElt">The pseudo-element to find styles for</param>
    /// <param name="ml">The medialist that the document is using</param>
    /// <param name="csd">A CssStyleDeclaration that holds the collected styles</param>
    internal void GetStylesForElement(XmlElement elt, string pseudoElt, CssCollectedStyleDeclaration csd, MediaList ml)
    {
      foreach(StyleSheet ss in styleSheets)
      {
        ss.GetStylesForElement(elt, pseudoElt, ml, csd);
      }
    }
    
    #endregion

    #region Implementation of IStyleSheetList
    /// <summary>
    /// The number of StyleSheets in the list. The range of valid child stylesheet indices is 0 to length-1 inclusive.
    /// </summary>
    public ulong Length
    {
      get
      {
        return (ulong)styleSheets.Count;
      }
    }

    /// <summary>
    /// Used to retrieve a style sheet by ordinal index. If index is greater than or equal to the number of style sheets in the list, this returns null.
    /// </summary>
    public IStyleSheet this[ulong index]
    {
      get
      {
        return (StyleSheet)styleSheets[(int)index];
      }
    }
    #endregion
  }
}