using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace pageControl.pageContorl
{
    /// <summary>/// 外部赋值顺序 1.PageSize 2.RecordCount
    /// </summary>
    public partial class pageControler : UserControl
    {
        public pageControler()
        {
            InitializeComponent();
           
        }

        public event EventHandler OnPageChanged;
        private int pageIndex = 1;
        public virtual int PageIndex
        {
            get
            {
               
                return pageIndex;
            }
            set {
                
                pageIndex = value;
                islodadControl();
            }
        }

        private int pageSize = 10;
        public virtual int PageSize
        {
            get { return pageSize; }
            set {
                
                pageSize = value;
               
            }
        }
        private int recordCount = 0;
        public virtual int RecordCount
        {
            get { return recordCount; }
            set {
              
                recordCount = value;
                    islodadControl();
            }
        }
        private void islodadControl()
        {
            databindControlDraw(false);
        }
        private void SetFormCtrEnabled()
        {
            this.lab_firstPage.Enabled = true;
            this.lab_endPage.Enabled = true;
            this.lab_upPage.Enabled = true;
            this.lab_nextPage.Enabled = true;
            this.lab_go.Enabled = true;
        }

        private int pageCount = 0;
        /// <summary>
        /// 总页数
        /// </summary>
       
        private int GetPageCount()
        {
            if (pageSize == 0)
            {
                return 0;
            }
            int pageCount = recordCount / pageSize;
            if (recordCount % pageSize == 0)
            {
                pageCount = recordCount / pageSize;
            }
            else
            {
                pageCount = recordCount / pageSize + 1;
            }
            return pageCount;
        } 
      /// <summary>
      /// 数据绑定 NoIsLoad 不是加载 ture执行Onpagechanged, false 不执行只样式变化
      /// </summary>
      /// <param name="NoIsLoad"></param>
        public void databindControlDraw(bool NoIsLoad)
        {
             pageCount = GetPageCount();
           
            if (NoIsLoad==true&&OnPageChanged != null)
            {
                OnPageChanged(this, null);
            }
            SetFormCtrEnabled();
            this.lab_pageNumber.Text = "第" + pageIndex.ToString() + "页/共" + pageCount.ToString() + "页";
            this.lab_rowCount.Text = "每页" + pageSize.ToString() + "条,共" + recordCount.ToString() + "条数据";
            if (pageCount <= 1)//有且仅有一页
            {
                this.lab_firstPage.Enabled = false;
                this.lab_upPage.Enabled = false;
                this.lab_nextPage.Enabled = false;
                this.lab_endPage.Enabled = false;
                this.lab_go.Enabled = false;
            }
            else if (pageIndex == 1)//第一页
            {
                this.lab_firstPage.Enabled = false;
                this.lab_upPage.Enabled = false;
            }
            else if (pageIndex == pageCount)//最后一页
            {
                this.lab_endPage.Enabled = false;
                this.lab_nextPage.Enabled = false;

            }
        }

        private void lab_firstPage_Click(object sender, EventArgs e)
        {
            pageIndex = 1;
            databindControlDraw(true);
        }

        private void lab_upPage_Click(object sender, EventArgs e)
        {
            pageIndex = Math.Max(1, pageIndex - 1);
            databindControlDraw(true);
        }

        private void lab_nextPage_Click(object sender, EventArgs e)
        {
            pageIndex = Math.Min(pageCount, pageIndex + 1);
            databindControlDraw(true);
        }

        private void lab_endPage_Click(object sender, EventArgs e)
        {
            pageIndex = pageCount;
            databindControlDraw(true);
        }

        private void lab_go_Click(object sender, EventArgs e)
        {
            int num = 0;
            if (int.TryParse(txt_pageNumber.Text.Trim(), out num))
            {
                pageIndex = num;
                if (pageIndex > pageCount )
                {
                    pageIndex = pageCount;
                    this.txt_pageNumber.Text = pageCount.ToString();
                }
                if (pageIndex < 1)
                {
                    pageIndex = 1;
                    this.txt_pageNumber.Text =(1).ToString();
                }
                databindControlDraw(true);
            }
        }

        private void pageControler_Load(object sender, EventArgs e)
        {
            
        }

      


    }
}

 private void button1_Click(object sender, EventArgs e)
        {
            databind(1);
            //给控件指定第一页
            this.pageControler1.PageIndex = 1;
        }