#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.Configuration;
using System.Windows.Forms;
using QMFrameWork.Data;
namespace QMAPP.WinForm.Controls
{
    /**/
    /// <summary>
    /// 申明委托
    /// </summary>
    /// <param name="e"></param>
    /// <returns></returns>
    public delegate DataPage EventPagingHandler(EventPagingArg e);
    /**/
    /// <summary>
    /// 分页控件呈现
    /// </summary>
    public partial class Pager : UserControl
    {
        public Pager()
        {
            InitializeComponent();
            dataPage.PageIndex = 1;
            dataPage.PageSize = 50;
        }

        public void Init()
        {
            this.DataPage = new DataPage();
            this.DataPage.PageIndex = 1;
            this.DataPage.PageSize = Convert.ToInt32(ConfigurationManager.AppSettings["PageSize"]);
           
        }

        public void Init(int pageSize)
        {
            this.DataPage = new DataPage();
            this.DataPage.PageIndex = 1;
            this.DataPage.PageSize = pageSize ;
           
        }

        public event EventPagingHandler EventPaging;

        //定义分页参数
        private DataPage dataPage = new DataPage();
       
        public DataPage DataPage
        {
            get {
                dataPage.Result = null;
                if (dataPage.PageIndex <= 0)
                {
                    dataPage.PageIndex = 1;
                }
                return dataPage;
            }
            set { dataPage = value;
            Show();
            }
        }


        //定义查询条件
        private object oSearch;

        public object OSearch
        {
            get { return oSearch; }
            set { oSearch = value; }
        }

        /**/
        /// <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()
        {
            if (this.EventPaging != null)
            {
                this.DataPage = this.EventPaging(new EventPagingArg(this.dataPage));
            }
        }

        private void Show()
        {
            if (this.dataPage.PageIndex > this.dataPage.PageCount)
            {
                this.dataPage.PageIndex = this.dataPage.PageCount;
            }
            if (this.dataPage.PageCount == 1)
            {
                this.dataPage.PageIndex = 1;
            }
            lblcurentpage.Text = dataPage.PageIndex.ToString();
            lblRecordCount.Text = "共有 " + dataPage.RecordCount.ToString() + " 条记录";

            lblPageCount.Text = " / " + dataPage.PageCount.ToString();
            lblPageCount1.Text = "每页 " + dataPage.PageSize.ToString() + " 条，共 " + dataPage.PageCount.ToString() + " 页";

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

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


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

            if (this.dataPage.RecordCount == 0)
            {
                btnNext.Enabled = false;
                btnLast.Enabled = false;
                btnFirst.Enabled = false;
                btnPrev.Enabled = false;
            }
            cmbPagecount.Items.Clear();
            for (int i = 1; i <= dataPage.PageCount; i++)
                cmbPagecount.Items.Add(i.ToString());
            cmbPagecount.SelectedIndex = dataPage.PageIndex - 1;
        
        }

        /// <summary>
        /// 首页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnFirst_Click(object sender, EventArgs e)
        {
            dataPage.PageIndex = 1;
            this.Bind();
        }
        //上一页
        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnPrev_Click(object sender, EventArgs e)
        {
            dataPage.PageIndex -= 1;
            if (dataPage.PageIndex <= 0)
            {
                dataPage.PageIndex = 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.dataPage.PageIndex += 1;
            if (dataPage.PageIndex > dataPage.PageCount)
            {
                dataPage.PageIndex = dataPage.PageCount;
            }
            this.Bind();
        }
        /// <summary>
        /// 最后页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnLast_Click(object sender, EventArgs e)
        {
            dataPage.PageIndex = dataPage.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)
        {
            int pageSelect = 0;
            if (Int32.TryParse(cmbPagecount.SelectedItem.ToString(), out pageSelect))
            {
                dataPage.PageIndex = pageSelect;
                this.Bind();
            } 
        }
    }
    /**/
    /// <summary>
    /// 自定义事件数据基类
    /// </summary>
    public class EventPagingArg : EventArgs
    {
        private DataPage _dataPage;
        public EventPagingArg(DataPage DataPage)
        {
            _dataPage = DataPage;
        }
    }
}