/BlogEngine/BlogEngine.NET/App_Code/Controls/PostCalendar.cs

// --------------------------------------------------------------------------------------------------------------------

// <summary>

//   The Post Calendar

// </summary>

// --------------------------------------------------------------------------------------------------------------------



namespace App_Code.Controls

{

    using System;

    using System.IO;

    using System.Linq;

    using System.Text;

    using System.Web;

    using System.Web.UI;

    using System.Web.UI.HtmlControls;

    using System.Web.UI.WebControls;



    using BlogEngine.Core;



    /// <summary>

    /// The Post Calendar

    /// </summary>

    public class PostCalendar : Calendar, ICallbackEventHandler

    {

        #region Constants and Fields



        /// <summary>

        /// The callback.

        /// </summary>

        private string callback;



        #endregion



        #region Properties



        /// <summary>

        /// Gets or sets a value indicating whether ShowPostTitles.

        /// </summary>

        public bool ShowPostTitles

        {

            get

            {

                return (bool)(this.ViewState["ShowPostTitles"] ?? default(bool));

            }



            set

            {

                this.ViewState["ShowPostTitles"] = value;

            }

        }



        #endregion



        #region Implemented Interfaces



        #region ICallbackEventHandler



        /// <summary>

        /// Returns the results of a callback event that targets a control.

        /// </summary>

        /// <returns>The result of the callback.</returns>

        public string GetCallbackResult()

        {

            return this.callback;

        }



        /// <summary>

        /// Processes a callback event that targets a control.

        /// </summary>

        /// <param name="eventArgument">A string that represents an event argument to pass to the event handler.</param>

        public void RaiseCallbackEvent(string eventArgument)

        {

            DateTime date;

            if (!DateTime.TryParse(eventArgument, out date))

            {

                return;

            }



            this.VisibleDate = date;

            this.ShowTitle = false;

            using (var sw = new StringWriter())

            {

                this.RenderControl(new HtmlTextWriter(sw));

                this.callback = sw.ToString();

            }

        }



        #endregion



        #endregion



        #region Methods



        /// <summary>

        /// Raises the <see cref="E:System.Web.UI.WebControls.Calendar.DayRender"/> event of the <see cref="T:System.Web.UI.WebControls.Calendar"/> control and allows you to provide a custom handler for the <see cref="E:System.Web.UI.WebControls.Calendar.DayRender"/> event.

        /// </summary>

        /// <param name="cell">A <see cref="T:System.Web.UI.WebControls.TableCell"/> that contains information about the cell to render.</param>

        /// <param name="day">A <see cref="T:System.Web.UI.WebControls.CalendarDay"/> that contains information about the day to render.</param>

        protected override void OnDayRender(TableCell cell, CalendarDay day)

        {

            if (day.IsToday)

            {

                cell.Attributes["id"] += "today";

            }



            var list = Post.GetPostsByDate(day.Date, day.Date);

            if (list.Count > 0)

            {

                cell.Controls.Clear();

                if (this.ShowPostTitles)

                {

                    cell.Controls.Add(new LiteralControl(day.DayNumberText));

                    foreach (var a in

                        list.Where(post => post.IsVisible).Select(post => new HtmlAnchor { InnerHtml = string.Format("<br /><br />{0}", post.Title), HRef = post.RelativeLink }))

                    {

                        cell.Controls.Add(a);

                    }

                }

                else

                {

                    if (list[0].IsVisible)

                    {

                        var a = new HtmlAnchor

                            {

                                InnerHtml = day.DayNumberText,

                                HRef =

                                    string.Format("{0}{1}/{2}/{3}/default{4}", Utils.RelativeWebRoot, day.Date.Year, day.Date.ToString("MM"), day.Date.ToString("dd"), BlogConfig.FileExtension)

                            };

                        a.Attributes["class"] = "exist";

                        cell.Controls.Add(a);

                    }

                    else

                    {

                        cell.Text = day.DayNumberText;

                    }

                }

            }

            else

            {

                cell.Controls.Clear();

                cell.Text = day.DayNumberText;

            }

        }



        /// <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)

        {

            this.Page.ClientScript.GetCallbackEventReference(this, "arg", null, "context");

            base.OnLoad(e);

        }



        /// <summary>

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

        /// </summary>

        /// <param name="e">An <see cref="T:System.EventArgs"/> that contains event data.</param>

        protected override void OnPreRender(EventArgs e)

        {

            if (!this.Page.IsCallback && !this.Page.IsPostBack)

            {

                this.VisibleDate = DateTime.Now;

            }



            if (!this.Page.IsPostBack && this.Context.Request.QueryString["date"] != null)

            {

                DateTime date;

                if (DateTime.TryParse(this.Context.Request.QueryString["date"], out date))

                {

                    this.VisibleDate = date;

                }

            }



            base.OnPreRender(e);



            if (!this.ShowPostTitles)

            {

                this.ShowTitle = false;

            }

        }



        /// <summary>

        /// Displays the <see cref="T:System.Web.UI.WebControls.Calendar"/> control on the client.

        /// </summary>

        /// <param name="writer">A <see cref="T:System.Web.UI.HtmlTextWriter"/> that contains the output stream for rendering on the client.</param>

        protected override void Render(HtmlTextWriter writer)

        {

            if (this.ShowPostTitles && !this.Page.IsCallback)

            {

                base.Render(writer);

            }

            else

            {

                if ((this.Page.IsPostBack && !this.Page.IsCallback) || this.VisibleDate == DateTime.MinValue)

                {

                    this.VisibleDate = DateTime.Now;

                }



                writer.Write("<div id=\"calendarContainer\">");

                writer.Write("<table class=\"calendar\" summary=\"\" style=\";border-collapse:collapse;\">");

                writer.Write("<tr><td>");



                var oldest = GetOldestPostDate();



                if (this.VisibleDate.Year != oldest.Year || this.VisibleDate.Month != oldest.Month)

                {

                    writer.Write("<a href=\"javascript:BlogEngine.Calendar.nav('{0}')\">{1}</a>&nbsp;&nbsp;", this.VisibleDate.AddMonths(-1).ToString("yyyy-MM-dd"), HttpUtility.HtmlEncode(this.PrevMonthText));

                }

                else

                {

                    writer.Write("{0}&nbsp;&nbsp;", HttpUtility.HtmlEncode(this.PrevMonthText));

                }



                writer.Write("</td><td style=\"text-align:center;width:100px\">{0}</td><td align=\"right\">", this.VisibleDate.ToString("MMMM yyyy"));



                if (this.VisibleDate.Year != DateTime.Now.Year || this.VisibleDate.Month != DateTime.Now.Month)

                {

                    writer.Write("&nbsp;&nbsp;<a href=\"javascript:BlogEngine.Calendar.nav('{0}')\">{1}</a>", this.VisibleDate.AddMonths(1).ToString("yyyy-MM-dd"), HttpUtility.HtmlEncode(this.NextMonthText));

                }

                else

                {

                    writer.Write("&nbsp;&nbsp;{0}", HttpUtility.HtmlEncode(this.NextMonthText));

                }



                writer.Write("</td></tr>");

                writer.Write("</table>");



                this.Attributes.Add("summary", "Post calendar");



                try

                {

                    base.Render(writer);

                }

                catch (Exception)

                {

                    writer.Write("<a href=\"javascript:void(location.reload(true))\">Reload page</a>");

                }



                writer.Write("</div>");



                if (!this.Page.IsCallback)

                {

                    writer.Write(this.Script());

                }

            }

        }



        /// <summary>

        /// Gets the oldest post date.

        /// </summary>

        /// <returns>The oldest post date.</returns>

        private static DateTime GetOldestPostDate()

        {

            return Post.Posts.Count > 0 ? Post.Posts[Post.Posts.Count - 1].DateCreated : DateTime.Now;

        }



        /// <summary>

        /// Scripts this instance.

        /// </summary>

        /// <returns>The script.</returns>

        private string Script()

        {

            var sb = new StringBuilder();

            sb.AppendFormat(

                @"<script type=""text/javascript"">

function setupBlogEngineCalendar() {{

  BlogEngine.Calendar = {{

  	  months: {{}},

	  nav: function(date) {{

		  var m = BlogEngine.Calendar.months;

		  if (m[date] == null || m[date] == 'undefined')  {{

		  	  {0}

		  }} else {{

			  BlogEngine.updateCalendar(m[date], date);

		  }}

	  }}

  }};

}}

</script>",

                this.Page.ClientScript.GetCallbackEventReference(this, "date", "BlogEngine.updateCalendar", "date"));



            /*

            ");

            sb.Append("var months = new Object();");

            sb.Append("function CalNav(date){");

            sb.Append("if (months[date] == null || months[date] == 'undefined')");

            sb.Append("{" + Page.ClientScript.GetCallbackEventReference(this, "date", "BlogEngine.updateCalendar", "date") + "}");

            sb.Append("else {BlogEngine.updateCalendar(months[date], date)}");

            sb.Append("}");

            sb.Append("</script>");

            */



            return sb.ToString();

        }



        #endregion

    }

}