using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Drawing;
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using System.Data;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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using DevExpress.XtraEditors;
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using DevExpress.Utils;
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using System.Threading.Tasks;
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namespace MFire.WinFrmUI
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{
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/// <summary>
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/// 分页控件
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/// </summary>
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public partial class PagerCtrl : XtraUserControl
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{
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public PagerCtrl()
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{
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InitializeComponent();
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}
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/// <summary>
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/// 查询分页数据事件
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/// </summary>
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/// 第一个参数为CurrentPage
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/// 第二个参数为PageSize
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/// 第三个参数为返回的总条数
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public event Func<int,int,Task<int>> QueryPageEvent;//返回总条数
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private int _pageSize = 40;//单页条数
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private int _pageIndex = 1;//当前页
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private int _total = 0;//总条数
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private int _pageNumber = 0;//总页数
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/// <summary>
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/// 被动查询
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/// </summary>
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public void PassiveQuery(bool reset=true)
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{
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if (reset)
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{
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_pageIndex = 1;
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}
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Query();
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}
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//内部查询
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private async void Query()
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{
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this.txtPageIndex.Text = _pageIndex.ToString();
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if (this.QueryPageEvent != null)
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{
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_total =await this.QueryPageEvent(_pageIndex,_pageSize);
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_pageNumber = CalcuPageCount(_total, _pageSize);
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this.labTotal.Text = $"共 {_total} 条";
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this.labPageCount.Text= $"共 {_pageNumber} 页";
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if (_pageIndex >= _pageNumber)
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{
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this.btnNext.Enabled = false;
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this.btnLast.Enabled = false;
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}
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else
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{
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this.btnNext.Enabled = true;
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this.btnLast.Enabled = true;
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}
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if (_pageIndex <= 1)
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{
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this.btnPre.Enabled = false;
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this.btnFirst.Enabled = false;
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}
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else
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{
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this.btnPre.Enabled = true;
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this.btnFirst.Enabled = true;
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}
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}
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}
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//计算页数
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private int CalcuPageCount(int total, int pageSize)
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{
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if (total % pageSize > 0)
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return total / pageSize + 1;
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return total / pageSize;
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}
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//首页
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private void btnFirst_Click(object sender, EventArgs e)
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{
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_pageIndex = 1;
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Query();
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}
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//上一页
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private void btnPre_Click(object sender, EventArgs e)
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{
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_pageIndex--;
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Query();
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}
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//下一页
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private void btnNext_Click(object sender, EventArgs e)
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{
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_pageIndex++;
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Query();
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}
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//末页
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private void btnLast_Click(object sender, EventArgs e)
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{
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_pageIndex = _pageNumber;
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Query();
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}
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//单页条数改变
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private void imgCmbPageSize_SelectedIndexChanged(object sender, EventArgs e)
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{
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_pageSize = (int)this.imgCmbPageSize.EditValue;
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_pageNumber = CalcuPageCount(_total,_pageSize);
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if (_pageIndex > _pageNumber)
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_pageIndex = _pageNumber;
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Query();
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}
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//跳转
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private void btnGo_Click(object sender, EventArgs e)
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{
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_pageIndex = int.Parse(this.txtToPageIndex.Text);
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Query();
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}
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}
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}
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