Draw/Paint a Header Checkbox in Gridview

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Collections;

namespace Samples

{

public partial class General : Form

{

public General()

{

InitializeComponent();

}

myColHeader hCell;

private void General_Load(object sender, EventArgs e)

{

DataTable dt = new DataTable();

dt.Columns.Add("status",typeof(bool));

dt.Rows.Add(true);

dt.Rows.Add(false);

dt.Rows.Add(true);

dt.Rows.Add(false);

dt.Rows.Add(true);

this.dataGridView1.DataSource = dt;

hCell = new myColHeader();

this.dataGridView1.Columns[0].HeaderCell = hCell;

}

private void dataGridView1_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)

{

if (e.ColumnIndex == 0)//the checkbox col

{

for (int j = 0; j < this.dataGridView1.Rows.Count - 1; j++)

{

this.dataGridView1.Rows[j].Cells[0].Value = hCell.CheckAll;

}

}

}

}

class myColHeader:DataGridViewColumnHeaderCell

{

private Rectangle CheckBoxRegion;

private bool checkAll = false;

protected override void Paint(Graphics graphics, Rectangle clipBounds, 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);

graphics.FillRectangle(new SolidBrush(cellStyle.BackColor), cellBounds);

CheckBoxRegion = new Rectangle(

cellBounds.Location.X+1,

cellBounds.Location.Y+2,

25, cellBounds.Size.Height-4);

if (this.checkAll)

ControlPaint.DrawCheckBox(graphics, CheckBoxRegion, ButtonState.Checked);

else

ControlPaint.DrawCheckBox(graphics, CheckBoxRegion, ButtonState.Normal);

Rectangle normalRegion =

new Rectangle(

cellBounds.Location.X + 1 + 25,

cellBounds.Location.Y,

cellBounds.Size.Width - 26,

cellBounds.Size.Height);

graphics.DrawString(value.ToString(), cellStyle.Font, new SolidBrush(cellStyle.ForeColor), normalRegion);

}

protected override void OnMouseClick(DataGridViewCellMouseEventArgs e)

{

//Convert the CheckBoxRegion

Rectangle rec = new Rectangle(new Point(0,0),this.CheckBoxRegion.Size);

this.checkAll = !this.checkAll;

if (rec.Contains(e.Location))

{

this.DataGridView.Invalidate();

}

base.OnMouseClick(e);

}

//Property

public bool CheckAll

{

get { return this.checkAll; }

set { this.checkAll = value; }

}

}

}