RecentComments.cs :  » Bloggers » BlogEngine.NET » Controls » C# / CSharp Open Source

#region Using

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using BlogEngine.Core;

#endregion

namespace Controls{
  /// <summary>
  /// Builds a category list.
  /// </summary>
  public class RecentComments : Control
  {

    static RecentComments()
    {
      BindComments();
      Post.CommentAdded += delegate { BindComments(); };
      Post.CommentRemoved += delegate { BindComments(); };
      Post.Saved += new EventHandler<SavedEventArgs>(Post_Saved);
      Comment.Approved += delegate { BindComments(); };
      BlogSettings.Changed += delegate { BindComments(); };
    }

    static void Post_Saved(object sender, SavedEventArgs e)
    {
      if (e.Action != SaveAction.Update)
        BindComments();
    }

    #region Private fields

    private static object _SyncRoot = new object();
    private static List<Comment> _Comments = new List<Comment>();

    #endregion

    private static void BindComments()
    {
      lock (_SyncRoot)
      {
        _Comments.Clear();
        List<Comment> comments = new List<Comment>();

        foreach (Post post in Post.Posts)
        {
          if (post.IsVisible)
          {
            foreach (Comment comment in post.Comments)
            {
              if (comment.IsApproved)
                comments.Add(comment);
            }
          }
        }

        comments.Sort();
        comments.Reverse();
        int counter = 0;

        foreach (Comment comment in comments)
        {
          if (counter == BlogSettings.Instance.NumberOfRecentComments)
            break;

          if (comment.Email == "pingback" || comment.Email == "trackback")
            continue;

          _Comments.Add(comment);
          counter++;
        }

        comments.Clear();
      }
    }

    private string RenderComments()
    {
      if (_Comments.Count == 0)
      {
        return "<p>" + Resources.labels.none + "</p>";
      }

      HtmlGenericControl ul = new HtmlGenericControl("ul");
      ul.Attributes.Add("class", "recentComments");
      ul.ID = "recentComments";

      foreach (Comment comment in _Comments)
      {
        if (comment.IsApproved)
        {
          HtmlGenericControl li = new HtmlGenericControl("li");

          // The post title
          HtmlAnchor title = new HtmlAnchor();
          title.HRef = comment.Parent.RelativeLink.ToString();
          title.InnerText = comment.Parent.Title;
          title.Attributes.Add("class", "postTitle");
          li.Controls.Add(title);

          // The comment count on the post
          LiteralControl count = new LiteralControl(" (" + ((Post)comment.Parent).ApprovedComments.Count + ")<br />");
          li.Controls.Add(count);

          // The author
          if (comment.Website != null)
          {
            HtmlAnchor author = new HtmlAnchor();
                        author.Attributes.Add("rel", "nofollow");
            author.HRef = comment.Website.ToString();
            author.InnerHtml = comment.Author;
            li.Controls.Add(author);

            LiteralControl wrote = new LiteralControl(" " + Resources.labels.wrote + ": ");
            li.Controls.Add(wrote);
          }
          else
          {
            LiteralControl author = new LiteralControl(comment.Author + " " + Resources.labels.wrote + ": ");
            li.Controls.Add(author);
          }

          // The comment body
          string commentBody = Regex.Replace(comment.Content, @"\[(.*?)\]", "");
          int bodyLength = Math.Min(commentBody.Length, 50);

          commentBody = commentBody.Substring(0, bodyLength);
          if (commentBody.Length > 0)
          {
            if (commentBody[commentBody.Length - 1] == '&')
            {
              commentBody = commentBody.Substring(0, commentBody.Length - 1);
            }
          }
          commentBody += comment.Content.Length <= 50 ? " " : " ";
          LiteralControl body = new LiteralControl(commentBody);
          li.Controls.Add(body);

          // The comment link
          HtmlAnchor link = new HtmlAnchor();
          link.HRef = comment.Parent.RelativeLink + "#id_" + comment.Id;
          link.InnerHtml = "[" + Resources.labels.more + "]";
          link.Attributes.Add("class", "moreLink");
          li.Controls.Add(link);

          ul.Controls.Add(li);
        }
      }

      StringWriter sw = new StringWriter();
      ul.RenderControl(new HtmlTextWriter(sw));
      return sw.ToString();
    }

    /// <summary>
    /// Renders the control.
    /// </summary>
    public override void RenderControl(HtmlTextWriter writer)
    {
      if (Post.Posts.Count > 0)
      {
        string html = RenderComments();
        writer.Write(html);
        writer.Write(Environment.NewLine);
      }
    }
  }
}