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using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.ComponentModel;

namespace ClassLibrary1
{
    public class ChangeColorDateControl : System.Web.UI.WebControls.WebControl, System.Web.UI.INamingContainer, System.Web.UI.IPostBackEventHandler
    {
        private static readonly object ClickKey = new object();

        [Description("单击日期触发的时间！")]
        public event EventHandler Click
        {
            add
            {
                Events.AddHandler(ClickKey, value);
            }
            remove
            {
                Events.RemoveHandler(ClickKey, value);
            }
        }

        private static readonly string[] header = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

        //private DateTime showDate;

        /// <summary>
        /// Gets or sets the show date.
        /// </summary>
        /// <value>The show date.</value>
        [Description("格式必须为yyyy-MM一样")]
        public string ShowDate
        {
            get
            {
                if (ViewState["showdate"] != null)
                {
                    return ViewState["showdate"].ToString();
                }
                else
                {

                    DateTime showDate = Convert.ToDateTime(System.DateTime.Now.Year + "-" + System.DateTime.Now.Month + "-01");
                    ViewState["showdate"] = showDate.ToString("yyyy-MM");
                    return ViewState["showdate"].ToString();
                }
            }
            set
            {
                DateTime showDate;
                if (value == null)
                {
                    showDate = Convert.ToDateTime(System.DateTime.Now.Year + "-" + System.DateTime.Now.Month + "-01");
                }
                else
                {
                    showDate = Convert.ToDateTime(value + "-01");
                }
                ViewState["showdate"] = showDate.ToString("yyyy-MM");

            }
        }

        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            //为table标签定义属性和样式
            // writer.AddAttribute(HtmlTextWriterAttribute.Width, "287px");
            //writer.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "1px");
            writer.AddAttribute(HtmlTextWriterAttribute.Border, "1px");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "0");
            base.AddAttributesToRender(writer);

        }

        /// <summary>
        /// 获取与此 Web 服务器控件相对应的 <see cref="T:System.Web.UI.HtmlTextWriterTag"></see> 值。此属性主要由控件开发人员使用。
        /// </summary>
        /// <value></value>
        /// <returns><see cref="T:System.Web.UI.HtmlTextWriterTag"></see> 枚举值之一。</returns>
        protected override HtmlTextWriterTag TagKey
        {
            get
            {
                return HtmlTextWriterTag.Table;
            }
        }
        /// <summary>
        /// 将控件的内容呈现到指定的编写器中。此方法主要由控件开发人员使用。
        /// </summary>
        /// <param name="writer"><see cref="T:System.Web.UI.HtmlTextWriter"></see>，表示要在客户端呈现 HTML 内容的输出流。</param>
        protected override void RenderContents(HtmlTextWriter writer)
        {

            DateTime showDate = Convert.ToDateTime(this.ShowDate + "-01");
            writer.RenderBeginTag(HtmlTextWriterTag.Thead);
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            writer.AddAttribute(HtmlTextWriterAttribute.Align, "center");
            writer.AddAttribute(HtmlTextWriterAttribute.Colspan, "7");
            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            writer.Write(showDate.Year + "年" + showDate.Month + "月");
            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderEndTag();
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            for (int i = 0; i < ChangeColorDateControl.header.Length; i++)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
                writer.Write(ChangeColorDateControl.header[i]);
                writer.RenderEndTag();
            }

            writer.RenderEndTag();
            DateTime end = showDate.AddMonths(1);
            int days = ((TimeSpan)end.Subtract(showDate)).Days;
            int spaceday = Convert.ToInt32(showDate.DayOfWeek);
            writer.RenderBeginTag(HtmlTextWriterTag.Tr);
            for (int i = 0; i < spaceday; i++)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Td);
                writer.WriteLine("&nbsp;");
                writer.RenderEndTag();
            }
            for (int i = 1; i <= days; i++)
            {
                writer.Write("<td onclick=\"if(this.style.backgroundColor!='red'){this.style.backgroundColor='red';}else{this.style.backgroundColor='blue';}");
//关键在于style.backgroundColor, 非background-color
                //writer.Write(Page.GetPostBackEventReference(this, this.ShowDate + "-" + i.ToString().PadLeft(2, '0')));
                writer.Write("\">" + i.ToString() + "</td>");

                //writer.RenderEndTag();
                if ((i + spaceday) % 7 == 0)
                {
                    writer.RenderEndTag();
                    writer.RenderBeginTag(HtmlTextWriterTag.Tr);
                }
            }
            if ((spaceday + days) % 7 != 0)
            {
                int allcount = spaceday + days > 35 ? 42 : 35;
                for (int i = 0; i < allcount - spaceday - days; i++)
                {
                    writer.RenderBeginTag(HtmlTextWriterTag.Td);
                    writer.Write("&nbsp;");

                    writer.RenderEndTag();
                }
                writer.RenderEndTag();
            }

        }

        protected virtual void OnClick(StringEventArgs e)
        {
            EventHandler clickEventDelegate =
               (EventHandler)Events[ClickKey];
            if (clickEventDelegate != null)
            {
                clickEventDelegate(this, e);
            }

        }

        IPostBackEventHandler 成员
    }

   
}