/BlogEngine/BlogEngine.NET/User controls/PostList.ascx.cs

namespace UserControls

{

    using System;

    using System.Collections.Generic;

    using System.Web.UI;



    using BlogEngine.Core;

    using BlogEngine.Core.Web.Controls;



    /// <summary>

    /// The post list user control.

    /// </summary>

    public partial class PostList : UserControl

    {

        #region Constants and Fields



        /// <summary>

        ///     The posts.

        /// </summary>

        private List<IPublishable> publishables;



        /// <summary>

        ///     Initializes a new instance of the <see cref = "PostList" /> class.

        /// </summary>

        public PostList()

        {

            this.ContentBy = ServingContentBy.AllContent;

        }



        #endregion



        #region Properties



        /// <summary>

        ///     Gets or sets the criteria by which the content is being served (by tag, category, author, etc).

        /// </summary>

        public ServingContentBy ContentBy { get; set; }



        /// <summary>

        ///     Gets or sets the list of posts to display.

        /// </summary>

        public List<IPublishable> Posts

        {

            get

            {

                return this.publishables;

            }



            set

            {

                this.publishables = value;

                this.pager1.Posts = value;

            }

        }



        #endregion



        #region Methods



        protected override void OnInit(EventArgs e)

        {

            base.OnInit(e);



            if (!Security.IsAuthorizedTo(Rights.ViewPublicPosts))

            {

                this.Visible = false;

            }



        }



        /// <summary>

        /// Raises the <see cref="E:System.Web.UI.Control.Load"/> event.

        /// </summary>

        /// <param name="e">

        /// The <see cref="T:System.EventArgs"/> object that contains the event data.

        /// </param>

        protected override void OnLoad(EventArgs e)

        {

            base.OnLoad(e);



            if (this.Page.IsCallback)

            {

                return;

            }



            this.BindPosts();

            this.InitPaging();

        }



        /// <summary>

        /// Binds the list of posts to individual postview.ascx controls

        ///     from the current theme.

        /// </summary>

        private void BindPosts()

        {

			if (this.Posts == null) {

				// no posts provided, load all posts by default

				Posts = Post.Posts.ConvertAll(new Converter<Post, IPublishable>(delegate(Post p) { return p as IPublishable; }));

			}

			

            if (this.Posts.Count == 0)

            {

                this.hlPrev.Visible = false;

                return;

            }



            var visiblePosts = this.Posts.FindAll(p => p.IsVisible);



            var count = Math.Min(BlogSettings.Instance.PostsPerPage, visiblePosts.Count);

            var page = this.GetPageIndex();

            var index = page * count;

            var stop = count;

            if (index + count > visiblePosts.Count)

            {

                stop = visiblePosts.Count - index;

            }



            if (stop < 0 || stop + index > visiblePosts.Count)

            {

                this.hlPrev.Visible = false;

                this.hlNext.Visible = false;

                return;

            }



            var path = string.Format("{0}themes/{1}/PostView.ascx", Utils.ApplicationRelativeWebRoot, BlogSettings.Instance.GetThemeWithAdjustments(this.Request.QueryString["theme"]));

            var counter = 0;



            foreach (Post post in visiblePosts.GetRange(index, stop))

            {

                if (counter == stop)

                {

                    break;

                }



                var postView = (PostViewBase)this.LoadControl(path);

                postView.ShowExcerpt = ShowExcerpt();

                postView.Post = post;

                postView.ID = post.Id.ToString().Replace("-", string.Empty);

                postView.Location = ServingLocation.PostList;

                postView.Index = counter;

                this.posts.Controls.Add(postView);

                counter++;

            }



            if (index + stop == this.Posts.Count)

            {

                this.hlPrev.Visible = false;

            }

        }



        /// <summary>

        /// Retrieves the current page index based on the QueryString.

        /// </summary>

        /// <returns>

        /// The get page index.

        /// </returns>

        private int GetPageIndex()

        {

            int index;

            if (int.TryParse(this.Request.QueryString["page"], out index))

            {

                index--;

            }



            return index;

        }



        /// <summary>

        /// Initializes the Next and Previous links

        /// </summary>

        private void InitPaging()

        {

            var path = this.Request.RawUrl.Replace("Default.aspx", string.Empty);



            path = path.Contains("?")

                       ? (path.Contains("page=")

                              ? path.Substring(0, path.IndexOf("page="))

                              : string.Format("{0}&", path))

                       : string.Format("{0}?", path);



            var page = this.GetPageIndex();

            var url = string.Format("{0}page={{0}}", path);



            // if (page != 1)

            this.hlNext.HRef = string.Format(url, page);



            // else

            // hlNext.HRef = path.Replace("?", string.Empty);

            this.hlPrev.HRef = string.Format(url, page + 2);



            if (page == 0)

            {

                this.hlNext.Visible = false;

            }

            else

            {

                ((BlogBasePage)this.Page).AddGenericLink("next", "Next page", this.hlNext.HRef);

            }



            if (this.hlPrev.Visible)

            {

                ((BlogBasePage)this.Page).AddGenericLink("prev", "Previous page", string.Format(url, page + 2));

            }

        }



        /// <summary>

        /// Whether or not to show the entire post or just the excerpt/description

        /// in the post list 

        /// </summary>

        /// <returns></returns>

        private bool ShowExcerpt()

        {

            string url = this.Request.RawUrl.ToUpperInvariant();

            bool tagOrCategory = url.Contains("/CATEGORY/") || url.Contains("?TAG=/");



            return BlogSettings.Instance.ShowDescriptionInPostList ||

                (BlogSettings.Instance.ShowDescriptionInPostListForPostsByTagOrCategory && tagOrCategory);

        }



        #endregion

    }

}