using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows.Forms;namespace Dxq.Foundation.Forms
{/// <summary>///     DataGridView助手./// </summary>public class DataGridViewAssistant{/// <summary>///     DataGridView/// </summary>private readonly DataGridView _dgv;/// <summary>///     是否已经添加校验行为/// </summary>private bool _addEditBehaviored;/// <summary>///     当前编辑时原始的值/// </summary>private object _editOldValue;/// <summary>///     是否已经添加过显示行号行为/// </summary>private bool _showRowNumed;/// <summary>///     校验规则集合/// </summary>private Dictionary<int, Func<int, object, bool>> _validationRules;/// <summary>///     校验成功时需要执行的方法/// </summary>private Action<int, int> _validationSucceedAction;/// <summary>///     初始化<see cref="DataGridViewAssistant" /> 类的新实例./// </summary>/// <param name="dgv">DataGridView控件.</param>/// <exception cref="ArgumentNullException">dgv</exception>public DataGridViewAssistant(DataGridView dgv){if (dgv == null){throw new ArgumentNullException(nameof(dgv));}_dgv = dgv;_dgv.AutoGenerateColumns = false;}/// <summary>///     添加在编辑时的校验行为./// </summary>/// <returns>DataGridViewAssistant.</returns>public DataGridViewAssistant AddValidationBehavior(){if (_addEditBehaviored){return this;}_validationRules = new Dictionary<int, Func<int, object, bool>>();_dgv.CellBeginEdit += DgvOnCellBeginEdit;_dgv.CellEndEdit   += DgvOnCellEndEdit;_addEditBehaviored = true;return this;}/// <summary>///     显示行号./// </summary>/// <returns>DataGridViewAssistant.</returns>public DataGridViewAssistant ShowRowNum(){if (_showRowNumed){return this;}_dgv.RowsAdded   += (sender, args) => { ShowRowNumAction(); };_dgv.RowsRemoved += (sender, args) => { ShowRowNumAction(); };_showRowNumed = true;return this;}/// <summary>///     添加单元格编辑校验规则./// </summary>/// <param name="columnIndex">Index of the column.</param>/// <param name="ruleFunc">The rule function.</param>/// <returns>DataGridViewAssistant.</returns>public DataGridViewAssistant AddCellEditValidationRule(int columnIndex, Func<int, object, bool> ruleFunc){if (_validationRules.ContainsKey(columnIndex)){return this;}_validationRules.Add(columnIndex, ruleFunc);return this;}/// <summary>///     Adds the validation succeed./// </summary>/// <param name="action">The action.</param>/// <returns>DataGridViewAssistant.</returns>public DataGridViewAssistant AddValidationSucceed(Action<int, int> action){if (action == null){throw new ArgumentNullException(nameof(action));}_validationSucceedAction = action;return this;}/// <summary>///     单元格编辑开始时触发的事件./// </summary>/// <param name="sender">发生源.</param>/// <param name="e">包含事件数据的<see cref="DataGridViewCellCancelEventArgs" />实例。</param>private void DgvOnCellBeginEdit(object sender, DataGridViewCellCancelEventArgs e){// 预存旧值,进行验证失败后进行回撤._editOldValue = _dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;}/// <summary>///     单元格编辑结束时触发的事件./// </summary>/// <param name="sender">发生源.</param>/// <param name="e">包含事件数据的<see cref="DataGridViewCellEventArgs" /> 实例。</param>private void DgvOnCellEndEdit(object sender, DataGridViewCellEventArgs e){if (_dgv.Columns[e.ColumnIndex].GetType().Name != typeof(DataGridViewTextBoxColumn).Name){return; //  其他情况值都是语言设定的 不进行校验}if (_validationRules.ContainsKey(e.ColumnIndex)){if (!_validationRules[e.ColumnIndex](e.RowIndex, _dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].Value)){_dgv.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = _editOldValue;return;}}_validationSucceedAction?.Invoke(e.RowIndex, e.ColumnIndex);}/// <summary>///     显示行号具体的执行方法./// </summary>private void ShowRowNumAction(){for (var i = 0; i < _dgv.Rows.Count; i++){_dgv.Rows[i].HeaderCell.Value = (i + 1).ToString(CultureInfo.InvariantCulture);}}}
}