Sunji-posv-net/pos/POSV.Template/Component/CouponListPanel.cs

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 POSV.Entity.Pormotion;
using POSV.MessageEvent;

namespace POSV.Component
{
    [ToolboxItem(true)]
    public partial class CouponListPanel : AbstractNotifyPanelEx
    {

        List<ElectronCoupon> _list = null;

        List<ElectronCouponItemControl> _controlList = new List<ElectronCouponItemControl>();

        public CouponListPanel()
        {
            InitializeComponent();

            PageNum = 1;

            MsgEvent.Receive(Constant.MEMBERCOUPON_CHANGE_NOTIFY, CouponChangedEventNotify);
        }

        protected void CouponChangedEventNotify(object sender, MsgEventArgs args)
        {
            var data = args.Data as Tuple<ElectronCoupon, bool>;
            if(_list != null)
            {
                if (_list.Contains(data.Item1))
                {
                    foreach(var con in _controlList)
                    {
                        var elec = con.Tag as ElectronCoupon;
                        if (elec.Code == data.Item1.Code)
                        {
                            con.RefreshView(elec);
                            break;
                        }
                    }
                }

            }
        }

        public void RefreshCoupons(List<ElectronCoupon> coupons)
        {
            _list = coupons;

            this.PageSize = this.Height / 56;
            this.TotalPage = (coupons.Count + PageSize - 1) / PageSize;

            var result = ListPager();

            _controlList = new List<ElectronCouponItemControl>();
            this.Controls.Clear();

            for(int i =0; i < result.Count; i++)
            {
                ElectronCouponItemControl item = new ElectronCouponItemControl();
                item.Width = this.Width - 3;
                item.RefreshView(result[i]);
                item.Tag = result[i];
                item.ButtonClick += (o, args) =>
                {
                    this.OnButtonClick(args);
                };
                if (i == 0)
                {
                    item.Location = new Point(0, 0);
                }
                else
                {
                    var lastItem = _controlList[i - 1];
                    item.Location = new Point(0, lastItem.Location.Y + lastItem.Height + 1);
                }
                _controlList.Add(item);
                this.Controls.Add(item);
            }
            this.Invalidate();
        }

        private List<ElectronCoupon> ListPager()
        {
            var result = new List<ElectronCoupon>();
            if(_list != null)
            {
                result.AddRange(_list.Skip(PageSize * (PageNum - 1)).Take(PageSize));
            }
            return result;
        }

        private int PageSize;

        private int PageNum;

        private int TotalPage;

        public void PageUp()
        {
            if(this.PageNum > 1)
            {
                this.PageNum--;
                RefreshCoupons(_list);
            }
            else
            {
                this.PageNum = 1;
            }
        }

        public void PageDown()
        {
            if(this.PageNum < TotalPage)
            {
                this.PageNum++;
                RefreshCoupons(_list);
            }
            else
            {
                this.PageNum = TotalPage;
            }
        }
    }
}