using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Text;

namespace FineUI.Examples.grid
{
    public partial class grid_paging_database_sorting : PageBase
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindGrid();
            }
        }

        #region BindGrid

        private void BindGrid()
        {
            // 1.设置总项数（特别注意：数据库分页一定要设置总记录数RecordCount）
            Grid1.RecordCount = GetTotalCount();

            // 2.获取当前分页数据
            DataTable table = GetPagedDataTable();

            // 3.绑定到Grid
            Grid1.DataSource = table;
            Grid1.DataBind();
        }

        /// <summary>
        /// 模拟返回总项数
        /// </summary>
        /// <returns></returns>
        private int GetTotalCount()
        {
            return DataSourceUtil.GetDataTable2().Rows.Count;
        }

        /// <summary>
        /// 模拟数据库分页
        /// </summary>
        /// <returns></returns>
        private DataTable GetPagedDataTable()
        {
            int pageIndex = Grid1.PageIndex;
            int pageSize = Grid1.PageSize;

            string sortField = Grid1.SortField;
            string sortDirection = Grid1.SortDirection;

            DataTable table2 = DataSourceUtil.GetDataTable2();

            DataView view2 = table2.DefaultView;
            view2.Sort = String.Format("{0} {1}", sortField, sortDirection);
            
            DataTable table = view2.ToTable();

            DataTable paged = table.Clone();

            int rowbegin = pageIndex * pageSize;
            int rowend = (pageIndex + 1) * pageSize;
            if (rowend > table.Rows.Count)
            {
                rowend = table.Rows.Count;
            }

            for (int i = rowbegin; i < rowend; i++)
            {
                paged.ImportRow(table.Rows[i]);
            }
            
            return paged;
        }

        #endregion

        #region Events

        protected void Button1_Click(object sender, EventArgs e)
        {
            labResult.Text = HowManyRowsAreSelected(Grid1);
        }


        protected void Grid1_PageIndexChange(object sender, GridPageEventArgs e)
        {
            //Grid1.PageIndex = e.NewPageIndex;

            BindGrid();
        }

        protected void Grid1_Sort(object sender, GridSortEventArgs e)
        {
            //Grid1.SortDirection = e.SortDirection;
            //Grid1.SortField = e.SortField;

            BindGrid();
        }

        #endregion

    }
}
