Study

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Security.Permissions;
using System.Drawing;

namespace PagerPro
{
    [AspNetHostingPermission(SecurityAction.Demand,
        Level = AspNetHostingPermissionLevel.Minimal),
    AspNetHostingPermission(SecurityAction.InheritanceDemand,
        Level = AspNetHostingPermissionLevel.Minimal)]
    [DefaultPropertyAttribute("StartPage")]
    [ToolboxData(@"<{0}:PagerPro runat='server'></{0}:PagerPro>")]

    public class PagerPro : CompositeControl
    {
        #region /**PRIVATE PARAMETER**/

        private LinkButton lbPrevious;
        private LinkButton lbNext;
        private LinkButton lbFirst;
        private LinkButton lbLast;
        private LinkButton[] lbPagingButtons;

        #endregion

        #region /**PROPERTYS**/

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public string Id
        {
            get { return ViewState["_id"] == null ? null : (string)ViewState["_id"]; }
            set { ViewState["_id"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public int StartPage
        {
            get { return ViewState["_startPage"] == null ? 1 : (int)ViewState["_startPage"]; }
            set { ViewState["_startPage"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public int PageCount
        {
            get { return ViewState["_pageCount"] == null ? 1 : (int)ViewState["_pageCount"]; }
            set { ViewState["_pageCount"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public int RowCount
        {
            get { return ViewState["_rowCount"] == null ? 0 : (int)ViewState["_rowCount"]; }
            set { ViewState["_rowCount"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public int CurrentPageNumeric
        {
            get { return ViewState["_currentPageNumeric"] == null ? 1 : (int)ViewState["_currentPageNumeric"]; }
            set { ViewState["_currentPageNumeric"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public int NumericButtonCount
        {
            get { return ViewState["_numericButtonCount"] == null ? 10 : (int)ViewState["_numericButtonCount"]; }
            set { ViewState["_numericButtonCount"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public bool ShowPrevious
        {
            get { return ViewState["_showPrevious"] == null ? true : (bool)ViewState["_showPrevious"]; }
            set { ViewState["_showPrevious"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public bool ShowNext
        {
            get { return ViewState["_showNext"] == null ? true : (bool)ViewState["_showNext"]; }
            set { ViewState["_showNext"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public bool ShowFirst
        {
            get { return ViewState["_showFirst"] == null ? true : (bool)ViewState["_showFirst"]; }
            set { ViewState["_showFirst"] = value; }
        }

        [Browsable(true)]
        [CategoryAttribute("Appearance")]
        public bool ShowLast
        {
            get { return ViewState["_showLast"] == null ? true : (bool)ViewState["_showLast"]; }
            set { ViewState["_showLast"] = value; }
        }

        #endregion

        #region /**PRIVATE METHOD**/

        private void AddPagingButtons()
        {
            int showPageCount = 0;
            if (StartPage + NumericButtonCount - 1 <= PageCount)
                showPageCount = NumericButtonCount;
            else
                showPageCount = PageCount - StartPage + 1;
            lbPagingButtons = new LinkButton[showPageCount];
            for (int i = 0; i < showPageCount; i++)
            {
                lbPagingButtons[i] = new LinkButton();
                lbPagingButtons[i].ID = ((int)(StartPage + i)).ToString();
                lbPagingButtons[i].Text = ((int)(StartPage + i)).ToString();
                //lbPagingButtons[i].Click += delegate(object sender, EventArgs e)
                //{
                //    string str = e.ToString();
                //    CurrentPageNumeric = StartPage + i;
                //};
                lbPagingButtons[i].Click+=new EventHandler(PagerPro_Click);
                this.Controls.Add(lbPagingButtons[i]);
            }
        }

        //private void ReAddPagingButtons()
        //{
        //    int showPageCount = 0;
        //    if (StartPage + NumericButtonCount - 1 <= PageCount)
        //        showPageCount = NumericButtonCount;
        //    else
        //        showPageCount = PageCount - StartPage + 1;
        //    lbPagingButtons = new LinkButton[showPageCount];
        //    for (int i = 0; i < showPageCount; i++)
        //    {
        //        lbPagingButtons[i] = new LinkButton();
        //        lbPagingButtons[i].ID = ((int)(StartPage + i)).ToString();
        //        lbPagingButtons[i].Text = ((int)(StartPage + i)).ToString();
        //        this.Controls.Add(lbPagingButtons[i]);
        //    }
        //}

        private void RenderButtonsRange(HtmlTextWriter writer)
        {
            int showPageCount = 0;
            if (StartPage + NumericButtonCount - 1 <= PageCount)
                showPageCount = NumericButtonCount;
            else
                showPageCount = PageCount - StartPage + 1;
            for (int i = 0; i < showPageCount; i++)
            {
                RenderControl(writer,lbPagingButtons[i]);
            }
        }

        //private string CreateANumericButton(string number)
        //{
        //    LinkButton lbNumber = new LinkButton();
        //    lbNumber.ID = number;
        //    lbNumber.Text = number;
        //    lbNumber.Click+=new EventHandler(lbNumber_Click);
        //}
        //private string ReturnNumericButton()
        //{
        //    string strReturn = "";
        //    for (int i = 0; i < NumericButtonCount; i++)
        //    {
        //        int number = StartPage + i;
        //        if (number <= PageCount)
        //            strReturn += "<a href='#'>" + number.ToString() + "</a> ";
        //    }
        //    return strReturn;
        //}

        private void AddTdBoderStyle(HtmlTextWriter writer)
        {
            //writer.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "1px");
            //writer.AddStyleAttribute(HtmlTextWriterStyle.Width, "25px");
            writer.AddStyleAttribute(HtmlTextWriterStyle.TextAlign, "center");
            //writer.AddStyleAttribute(HtmlTextWriterStyle.BorderColor, ColorTranslator.ToHtml(Color.CornflowerBlue));
            //writer.AddStyleAttribute(HtmlTextWriterStyle.BorderStyle, BorderStyle.Solid.ToString());
        }

        private void RenderControl(HtmlTextWriter writer, LinkButton lb)
        {
            AddTdBoderStyle(writer);
            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            lb.RenderControl(writer);
            writer.RenderEndTag();
        }

        #endregion

        #region /**EVENT**/

        protected void PagerPro_Click(object sender, EventArgs e)
        {
            LinkButton lb=(LinkButton)sender;
            int currentNumber = Convert.ToInt32(lb.ID.Trim());
            CurrentPageNumeric = currentNumber;
            AddPagingButtons();
        }

        protected void lbFirst_Click(object sender, EventArgs e)
        {
            StartPage = 1;
            CurrentPageNumeric = 1;
            AddPagingButtons();
        }
        protected void lbLast_Click(object sender, EventArgs e)
        {
            if (CurrentPageNumeric != PageCount)
            {
                int temp = PageCount / NumericButtonCount;
                StartPage = NumericButtonCount * temp+1;
                CurrentPageNumeric = PageCount;
                AddPagingButtons();
            }
        }
        protected void lbPrevious_Click(object sender, EventArgs e)
        {
            if (CurrentPageNumeric > StartPage)
                CurrentPageNumeric--;
            else if (CurrentPageNumeric == StartPage)
            {
                if (StartPage == 1)
                    return;
                else
                {
                    StartPage = CurrentPageNumeric - NumericButtonCount;
                    CurrentPageNumeric--;
                }
            }
            AddPagingButtons();
        }
        protected void lbNext_Click(object sender, EventArgs e)
        {
            int currentLastNumber = StartPage + NumericButtonCount - 1;
            if (currentLastNumber < PageCount)
            {
                if (CurrentPageNumeric < currentLastNumber)
                    CurrentPageNumeric++;
                else if (CurrentPageNumeric == currentLastNumber)
                {
                    StartPage = CurrentPageNumeric + 1;
                    CurrentPageNumeric++;
                }
            }
            else if (currentLastNumber >= PageCount)
            {
                if (CurrentPageNumeric < PageCount)
                    CurrentPageNumeric++;
                else if (CurrentPageNumeric == PageCount)
                    return;
            }
            AddPagingButtons();
        }

        #endregion

        #region /**OVERRIDE**/

        protected override void RecreateChildControls()
        {
            EnsureChildControls();
        }

        protected override void CreateChildControls()
        {
            this.Controls.Clear();

            lbFirst = new LinkButton();
            lbFirst.ID = "lbFirst";
            lbFirst.Text = "<<";
            lbFirst.Width = Unit.Parse("25px");
            lbFirst.Font.Underline = false;
            lbFirst.Click += new EventHandler(lbFirst_Click);

            lbLast = new LinkButton();
            lbLast.ID = "lbLast";
            lbLast.Text = ">>";
            lbLast.Width = Unit.Parse("25px");
            lbLast.Font.Underline = false;
            lbLast.Click += new EventHandler(lbLast_Click);

            lbPrevious = new LinkButton();
            lbPrevious.ID = "lbPrvious";
            lbPrevious.Text = "<";
            lbPrevious.Width = Unit.Parse("25px");
            lbPrevious.Font.Underline = false;
            lbPrevious.Click += new EventHandler(lbPrevious_Click);

            lbNext = new LinkButton();
            lbNext.ID = "lbNext";
            lbNext.Text = ">";
            lbNext.Width = Unit.Parse("25px");
            lbNext.Font.Underline = false;
            lbNext.Click += new EventHandler(lbNext_Click);

            this.Controls.Add(lbFirst);
            this.Controls.Add(lbLast);
            this.Controls.Add(lbPrevious);
            this.Controls.Add(lbNext);

            AddPagingButtons();
        }

        protected override void Render(HtmlTextWriter writer)
        {
            AddAttributesToRender(writer);

            writer.AddAttribute(HtmlTextWriterAttribute.Border, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellpadding, "0");
            writer.AddAttribute(HtmlTextWriterAttribute.Cellspacing, "3");
            writer.RenderBeginTag(HtmlTextWriterTag.Table);

            writer.RenderBeginTag(HtmlTextWriterTag.Tr);

            writer.AddStyleAttribute(HtmlTextWriterStyle.BorderWidth, "1px");
            writer.AddStyleAttribute(HtmlTextWriterStyle.BorderStyle, BorderStyle.Solid.ToString());
            writer.RenderBeginTag(HtmlTextWriterTag.Td);

            writer.Write("Total Page: " + PageCount.ToString());
            LiteralControl lc = new LiteralControl();
            lc.Text = "       ";
            lc.RenderControl(writer);
            writer.RenderEndTag();

            if (ShowFirst == true)
            {
                RenderControl(writer,lbFirst);
            }
            if (ShowPrevious == true)
            {
                RenderControl(writer, lbPrevious);
            }
            
            RenderButtonsRange(writer);
            
            if (ShowNext == true)
            {
                RenderControl(writer, lbNext);
            }
            if (ShowLast == true)
            {
                RenderControl(writer, lbLast);
            }

            writer.RenderBeginTag(HtmlTextWriterTag.Td);
            //input text
            writer.AddAttribute(HtmlTextWriterAttribute.Id, "txtGoToPage");
            writer.AddAttribute(HtmlTextWriterAttribute.Name, "GoToPage");
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "text");
            writer.AddStyleAttribute(HtmlTextWriterStyle.Width, "30");
            writer.RenderBeginTag(HtmlTextWriterTag.Input);
            writer.RenderEndTag();
            //input button
            writer.AddAttribute(HtmlTextWriterAttribute.Id, "btnGo");
            writer.AddAttribute(HtmlTextWriterAttribute.Name, "Go");
            writer.AddAttribute(HtmlTextWriterAttribute.Value, "Go");
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "button");
            writer.AddStyleAttribute(HtmlTextWriterStyle.Width, "30");
            writer.RenderBeginTag(HtmlTextWriterTag.Input);
            writer.RenderEndTag();

            writer.RenderEndTag();
            writer.RenderEndTag();
            //base.Render(writer);
        }

        #endregion

        public PagerPro()
        { }
    }
}