Winform DataGridView添加列头checkbox

 

 

using System;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using Yanwen.Logistics.Business.Logics;
using Yanwen.Logistics.Business.Models.ExpressTransport;
using Yanwen.Logistics.Desktop.Extensions;

namespace Yanwen.Logistics.Desktop.Transport
{
    public partial class TransportLanshouForm : Form
    {
       public TransportLanshouForm()
        {
            InitializeComponent();
        }
        //显示行号
        private void gdvData_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
        {
            var b = new SolidBrush(gdvData.RowHeadersDefaultCellStyle.ForeColor);
            e.Graphics.DrawString((e.RowIndex + 1).ToString(System.Globalization.CultureInfo.CurrentUICulture), gdvData.DefaultCellStyle.Font, b, e.RowBounds.Location.X + 20, e.RowBounds.Location.Y + 4);
        }
private void TransportLanshouForm_Load(object sender, EventArgs e)
        {
            var ch = new DatagridviewCheckboxHeaderCell();
            ch.OnCheckBoxClicked += new DatagridviewcheckboxHeaderEventHander(ch_OnCheckBoxClicked);//关联单击事件
            var checkboxCol = this.gdvData.Columns[0] as DataGridViewCheckBoxColumn;
            checkboxCol.HeaderCell = ch;
            checkboxCol.HeaderCell.Value = string.Empty;//消除列头checkbox旁出现的文字
        }

        /// <summary>
        /// 单击事件
        /// </summary>
        private void ch_OnCheckBoxClicked(object sender, DatagridviewCheckboxHeaderEventArgs e)
        {
            foreach (DataGridViewRow dgvRow in this.gdvData.Rows)
            {
                dgvRow.Cells[0].Value = e.CheckedState;
            }
        }
    }

//定义触发单击事件的委托
    public delegate void DatagridviewcheckboxHeaderEventHander(object sender, DatagridviewCheckboxHeaderEventArgs e);
    
    //定义包含列头checkbox选择状态的参数类
    public class DatagridviewCheckboxHeaderEventArgs : EventArgs
    {
        public DatagridviewCheckboxHeaderEventArgs()
        {
            CheckedState = false;
        }

        public bool CheckedState { get; set; }
    }
    
    //定义继承于DataGridViewColumnHeaderCell的类，用于绘制checkbox，定义checkbox鼠标单击事件
    class DatagridviewCheckboxHeaderCell : DataGridViewColumnHeaderCell
    {
        Point checkBoxLocation;
        Size checkBoxSize;
        bool _checked = false;
        Point _cellLocation = new Point();
        System.Windows.Forms.VisualStyles.CheckBoxState _cbState =
            System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal;
        public event DatagridviewcheckboxHeaderEventHander OnCheckBoxClicked;


        //绘制列头checkbox
        protected override void Paint(System.Drawing.Graphics graphics,
           System.Drawing.Rectangle clipBounds,
           System.Drawing.Rectangle cellBounds,
           int rowIndex,
           DataGridViewElementStates dataGridViewElementState,
           object value,
           object formattedValue,
           string errorText,
           DataGridViewCellStyle cellStyle,
           DataGridViewAdvancedBorderStyle advancedBorderStyle,
           DataGridViewPaintParts paintParts)
        {
            base.Paint(graphics, clipBounds, cellBounds, rowIndex,
                dataGridViewElementState, value,
                formattedValue, errorText, cellStyle,
                advancedBorderStyle, paintParts);
            Point p = new Point();
            Size s = CheckBoxRenderer.GetGlyphSize(graphics,
            System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal);
            p.X = cellBounds.Location.X +
                (cellBounds.Width / 2) - (s.Width / 2) - 1;//列头checkbox的X坐标
            p.Y = cellBounds.Location.Y +
                (cellBounds.Height / 2) - (s.Height / 2);//列头checkbox的Y坐标
            _cellLocation = cellBounds.Location;
            checkBoxLocation = p;
            checkBoxSize = s;
            if (_checked)
                _cbState = System.Windows.Forms.VisualStyles.
                    CheckBoxState.CheckedNormal;
            else
                _cbState = System.Windows.Forms.VisualStyles.
                    CheckBoxState.UncheckedNormal;
            CheckBoxRenderer.DrawCheckBox
            (graphics, checkBoxLocation, _cbState);
        }



        /// <summary>
        /// 点击列头checkbox单击事件
        /// </summary>
        protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)
        {

            var p = new Point(e.X + _cellLocation.X, e.Y + _cellLocation.Y);
            if (p.X >= checkBoxLocation.X && p.X <= checkBoxLocation.X + checkBoxSize.Width 
                && p.Y >= checkBoxLocation.Y && p.Y <= checkBoxLocation.Y + checkBoxSize.Height)
            {
                _checked = !_checked;

                //获取列头checkbox的选择状态
                var ex = new DatagridviewCheckboxHeaderEventArgs { CheckedState = _checked };

                var sender = new object();//此处不代表选择的列头checkbox，只是作为参数传递。应该列头checkbox是绘制出来的，无法获得它的实例
                if (OnCheckBoxClicked != null)
                {
                    OnCheckBoxClicked(sender, ex);//触发单击事件
                    this.DataGridView.InvalidateCell(this);
                }
            }
            base.OnMouseClick(e);
        }

    }

}