29WxOrder/29WxOrder/MyControl/UcPager.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using NaiBa.Util.Extension;

namespace _29WxOrder.MyControl
{
    public partial class UcPager : UserControl
    {
        public UcPager()
        {
            InitializeComponent();
        }

        private void UcPager_Load(object sender, EventArgs e)
        {
            ShowPageNumber();
        }

        public delegate void PageTurnEvent(object sender, int page);
        public event PageTurnEvent PageTurned;

        public int TotalCount { get; set; } = -1;
        int totalPage = 1;
        public int TotalPage { get { return totalPage; } set { totalPage = value; ShowPageNumber(); } }
        int currentPage = 1;
        public int CurrentPage { get { return currentPage; } set { currentPage = value; ShowPageNumber(); } }

        private void lblPage_Click(object sender, EventArgs e)
        {
            var label = sender as Label;
            if (label == null)
                return;
            if (label.Cursor != Cursors.Hand)
                return;

            if (label.Text == "尾页")
                currentPage = TotalPage;
            else if (label.Text == "首页")
                currentPage = 1;
            else if (label.Text == "▷")
                currentPage += 1;
            else if (label.Text == "◁")
                currentPage -= 1;
            else
                currentPage = Convert.ToInt32(label.Text);

            ShowPageNumber();

            PageTurned(this, currentPage);
        }

        /// <summary>
        /// 显示分页页码
        /// </summary>
        void ShowPageNumber()
        {
            if (currentPage > totalPage)
                currentPage = totalPage;
            if (currentPage < 1)
                currentPage = 1;

            int startPage;
            if (currentPage + 4 >= totalPage)
                startPage = totalPage - 8;
            else
                startPage = currentPage - 4;
            if (startPage < 1)
                startPage = 1;
            var endPage = startPage + 8;
            if (endPage > totalPage)
                endPage = totalPage;

            lblTotal.Text = "共 " + totalPage + " 页" + (TotalCount >= 0 ? " " + TotalCount + " 条数据" : "");

            if (totalPage >= 2)
            {
                lblFirstPage.Visible = lblLastPage.Visible = lblPrev.Visible = lblNext.Visible = txtJumpPage.Visible = lblJump.Visible = true;
                if (currentPage == 1)
                {
                    lblFirstPage.Font = new Font(lblFirstPage.Font.FontFamily, lblFirstPage.Font.Size);
                    lblFirstPage.Cursor = Cursors.Default;
                    lblFirstPage.ForeColor = Color.Black;
                    lblPrev.Font = new Font(lblPrev.Font.FontFamily, lblPrev.Font.Size);
                    lblPrev.Cursor = Cursors.Default;
                    lblPrev.ForeColor = Color.Black;
                }
                else
                {
                    lblFirstPage.Font = new Font(lblFirstPage.Font.FontFamily, lblFirstPage.Font.Size, FontStyle.Underline);
                    lblFirstPage.Cursor = Cursors.Hand;
                    lblFirstPage.ForeColor = Color.Blue;
                    lblPrev.Font = new Font(lblPrev.Font.FontFamily, lblPrev.Font.Size, FontStyle.Underline);
                    lblPrev.Cursor = Cursors.Hand;
                    lblPrev.ForeColor = Color.Blue;
                }
                if (currentPage == totalPage)
                {
                    lblLastPage.Font = new Font(lblFirstPage.Font.FontFamily, lblFirstPage.Font.Size);
                    lblLastPage.Cursor = Cursors.Default;
                    lblLastPage.ForeColor = Color.Black;
                    lblNext.Font = new Font(lblPrev.Font.FontFamily, lblPrev.Font.Size);
                    lblNext.Cursor = Cursors.Default;
                    lblNext.ForeColor = Color.Black;
                }
                else
                {
                    lblLastPage.Font = new Font(lblFirstPage.Font.FontFamily, lblFirstPage.Font.Size, FontStyle.Underline);
                    lblLastPage.Cursor = Cursors.Hand;
                    lblLastPage.ForeColor = Color.Blue;
                    lblNext.Font = new Font(lblPrev.Font.FontFamily, lblPrev.Font.Size, FontStyle.Underline);
                    lblNext.Cursor = Cursors.Hand;
                    lblNext.ForeColor = Color.Blue;
                }
            }
            else
            {
                lblFirstPage.Visible = lblLastPage.Visible = lblPrev.Visible = lblNext.Visible /*= txtJumpPage.Visible = lblJump.Visible*/ = false;
            }

            // 初始化按钮数量
            while (pnlPage.Controls.Count <= endPage - startPage)
            {
                var l = new Label() { TextAlign = ContentAlignment.MiddleCenter, };
                l.Click += lblPage_Click;
                pnlPage.Controls.Add(l);
            }
            // 按钮偏移位置计数
            int x = (int)(lblNext.Font.Size / 2);
            // 调整按钮位置等
            for (int i = startPage; i < startPage + pnlPage.Controls.Count; i++)
            {
                Label lbl = pnlPage.Controls[i - startPage] as Label;
                if (i > endPage)
                {
                    lbl.Visible = false;
                    continue;
                }
                lbl.MinimumSize = new Size(20, (int)lblNext.Font.Size + 6);
                lbl.Visible = true;
                lbl.AutoSize = true;
                lbl.Text = i.ToString();
                lbl.Name = "lbl" + i.ToString();
                lbl.Location = new Point(x, lbl.Location.Y);
                if (i == currentPage)
                {
                    lbl.Font = new Font("Microft YaHei", lbl.Font.Size);
                    lbl.Cursor = Cursors.Default;
                    lbl.ForeColor = Color.Black;
                }
                else
                {
                    lbl.Font = new Font("Microft YaHei", lbl.Font.Size, FontStyle.Underline);
                    lbl.Cursor = Cursors.Hand;
                    lbl.ForeColor = Color.Blue;
                }
                x += lbl.Width + 10;
            }
        }

        private void lblJump_Click(object sender, EventArgs e)
        {
            this.currentPage = this.txtJumpPage.Text.ParseToInt();
            ShowPageNumber();
            PageTurned(this, currentPage);
        }
    }
}