#region  版权信息
/*---------------------------------------------------------------------*
// 项目  名称：《Winform分页控件》
// 文  件  名： Pager.cs
// 描      述： 分页控件
// 作      者：kwon yan
*----------------------------------------------------------------------*/
#endregion

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;
//using DeiNiu.Utils;

namespace DeiNiu.Controls.pager
{
    /**/
    /// <summary>
    /// 申明委托
    /// </summary>
    /// <param name="e"></param>
    /// <returns></returns>
    public delegate int EventPagingHandler(EventPagingArg e);
    /**/
    /// <summary>
    /// 分页控件呈现
    /// </summary>
    public partial class Pager : UserControl
    {
        public Pager()
        {
            InitializeComponent();
            this.bindingNavigator1.LayoutStyle = ToolStripLayoutStyle.HorizontalStackWithOverflow;
            this.bindingNavigator1.AutoSize = true;
        }
        public event EventPagingHandler EventPaging;
        /**/
        /// <summary>
        /// 每页显示记录数
        /// </summary>
        private int _pageSize = 100;//Utils.WmsConstants.PAGER_SIZE;
        /**/
        /// <summary>
        /// 每页显示记录数
        /// </summary>
        public int PageSize
        {
            get { return _pageSize; }
            set
            {
                _pageSize = value;
                GetPageCount();
            }
        }

        private int _nMax = 0;
        /**/
        /// <summary>
        /// 总记录数
        /// </summary>
        public int NMax
        {
            get { return _nMax; }
            set
            {
                _nMax = value;
                GetPageCount();
            }
        }

        private int _pageCount = 0;
        /**/
        /// <summary>
        /// 页数=总记录数/每页显示记录数
        /// </summary>
        public int PageCount
        {
            get { return _pageCount; }
            set { _pageCount = value; }
        }

        private int _pageCurrent = 0;
        /**/
        /// <summary>
        /// 当前页号
        /// </summary>
        public int PageCurrent
        {
            get {
               // _pageCurrent = _pageCurrent > _pageCount ? _pageCount : _pageCurrent;
             //   _pageCurrent = _pageCurrent == 0 && _pageCount > 0 ? 1 : _pageCurrent;
                return _pageCurrent;
            }
            set { _pageCurrent = value; }
        }

        /// <summary>
        /// 设置页面大小
        /// </summary>
        private void GetPageCount()
        {
            if (this.NMax > 0)
            {
                this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.NMax) / Convert.ToDouble(this.PageSize)));
               // lblPageCount.Text = " / " + PageCount.ToString();
                lblcurentpage.Text = PageCurrent.ToString() + " / " + PageCount.ToString();
                //lblPageCount1.Text = "每页 "+PageSize .ToString ()+" 条，共 "+PageCount.ToString()+" 页";
             //   lblPageCount1.Text = "Page no: " + PageSize.ToString() + ",Total:" + PageCount.ToString() + " pages";
             //   lblPageCount1.Text =   PageSize.ToString() + "/" + PageCount.ToString() ;
            }
            else
            {
                this.PageCount = 0;
            }
        }

        /**/
        /// <summary>
        /// 翻页控件数据绑定的方法 关键是这步，都是调用这里
        /// </summary>
        public void Bind(bool query=true )
        {

            try
            {
                NMax = 0;
                if (query && this.EventPaging != null)
                {
                    this.NMax = this.EventPaging(new EventPagingArg(this.PageCurrent));
                }

                if (this.PageCurrent > this.PageCount)
                {
                    this.PageCurrent = this.PageCount;
                }
                if (this.PageCount == 1)
                {
                    this.PageCurrent = 1;
                }
                lblcurentpage.Text = PageCurrent.ToString() + " / " + PageCount.ToString();
                lblRecordCount.Text = "共" + NMax.ToString() + "条";
                // lblRecordCount.Text = "Total: " + NMax.ToString() + " records";


                btnPrev.Enabled = true;
                btnFirst.Enabled = true;
                btnLast.Enabled = true;
                btnNext.Enabled = true;

                if (this.PageCurrent == 1)
                {
                    this.btnPrev.Enabled = false;
                    this.btnFirst.Enabled = false;
                }


                if (this.PageCurrent == this.PageCount)
                {
                    this.btnLast.Enabled = false;
                    this.btnNext.Enabled = false;
                }

                if (this.NMax == 0)
                {
                    btnNext.Enabled = false;
                    btnLast.Enabled = false;
                    btnFirst.Enabled = false;
                    btnPrev.Enabled = false;
                }
                cmbPagecount.Items.Clear();
                for (int i = 1; i <= PageCount; i++)
                {
                    cmbPagecount.Items.Add(i.ToString());
                    //if(i== PageCurrent - 1){
                    //    cmbPagecount.SelectedItem = cmbPagecount.Items[i - 1];
                    //}
                }
                this.cmbPagecount.SelectedIndexChanged -= new System.EventHandler(this.cmbPagecount_SelectedIndexChanged);
                cmbPagecount.SelectedIndex = PageCurrent - 1;
                this.cmbPagecount.SelectedIndexChanged += new System.EventHandler(this.cmbPagecount_SelectedIndexChanged);


                comPagesize.Items.Clear();
                for (int i = 100; i <= 900; i += 100)
                {
                    comPagesize.Items.Add(i.ToString());

                }
                /*
                for (int i = 50; i <= 500; i+=50)
                {
                    comPagesize.Items.Add(i.ToString());
                
                }
                */
                for (int i = 1000; i <= 9000; i += 1000)
                {
                    comPagesize.Items.Add(i.ToString());
                }
                this.comPagesize.SelectedIndexChanged -= new System.EventHandler(this.comPagesize_SelectedIndexChanged);
                //   comPagesize.SelectedIndex = this._pageSize / 100 -1;
                //  comPagesize.SelectedIndex = this._pageSize / 50 - 1  ;
                comPagesize.SelectedIndex = _pageSize <= 1000 ? this._pageSize / 100 - 1 : 10 + _pageSize / 1000 - 2;
                this.comPagesize.SelectedIndexChanged += new System.EventHandler(this.comPagesize_SelectedIndexChanged);
            }
            catch (Exception er)
            {
                
            }

        }
        /// <summary>
        /// 首页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFirst_Click(object sender, EventArgs e)
        {
            PageCurrent = 1;
            this.Bind();
        }
        //上一页
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPrev_Click(object sender, EventArgs e)
        {
            PageCurrent -= 1;
            if (PageCurrent <= 0)
            {
                PageCurrent = 1;
            }
            this.Bind();
        }
        /// <summary>
        /// 下一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnNext_Click(object sender, EventArgs e)
        {
            this.PageCurrent += 1;
            if (PageCurrent > PageCount)
            {
                PageCurrent = PageCount;
            }
            this.Bind();
        }
        /// <summary>
        /// 最后页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnLast_Click(object sender, EventArgs e)
        {
            PageCurrent = PageCount;
            this.Bind();
        }
        /// <summary>
        /// 转到新页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void btnGo_Click(object sender, EventArgs e)
        {
            if (Int32.TryParse(cmbPagecount.SelectedItem.ToString(), out _pageCurrent))
            {
                this.Bind();
            } 
        }

        private void cmbPagecount_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (Int32.TryParse(cmbPagecount.SelectedItem.ToString(), out _pageCurrent))
            {
                this.Bind();
            } 
        }
        private void comPagesize_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (Int32.TryParse(comPagesize.SelectedItem.ToString(), out _pageSize))
            {
                GetPageCount();
                this.Bind();
            }
           
       
        }

        private void lblRecordCount_Click(object sender, EventArgs e)
        {

        }
    }
    /**/
    /// <summary>
    /// 自定义事件数据基类
    /// </summary>
    public class EventPagingArg : EventArgs
    {
        private int _intPageIndex;
        public EventPagingArg(int PageIndex)
        {
            _intPageIndex = PageIndex;
        }
    }
}