How can I change the color of the check mark of a CheckBox? [duplicate]

Answer 1

You can simply draw the checkmark in the Paint event:

private void checkBox1_Paint(object sender, PaintEventArgs e)
{
    Point pt = new  Point(e.ClipRectangle.Left + 2, e.ClipRectangle.Top + 4);
    Rectangle rect = new Rectangle(pt, new Size(22, 22));
    if (checkBox1.Checked)
    {
       using (Font wing = new Font("Wingdings", 14f))
          e.Graphics.DrawString("ü", wing, Brushes.DarkOrange,rect);
    }
    e.Graphics.DrawRectangle(Pens.DarkSlateBlue, rect);
}

for this to work you need to:

• set Apperance = Appearance.Button
• set FlatStyle = FlatStyle.Flat
• set TextAlign = ContentAlignment.MiddleRight
• set FlatAppearance.BorderSize = 0
• set AutoSize = false

If you want to re-use this it will be best to subclass the checkbox and override the OnPaint event there. Here is an example:

public ColorCheckBox()
{
    Appearance = System.Windows.Forms.Appearance.Button;
    FlatStyle = System.Windows.Forms.FlatStyle.Flat;
    TextAlign = ContentAlignment.MiddleRight;
    FlatAppearance.BorderSize = 0;
    AutoSize = false;
    Height = 16;
}

protected override void OnPaint(PaintEventArgs pevent)
{
    //base.OnPaint(pevent);

    pevent.Graphics.Clear(BackColor);

    using (SolidBrush brush = new SolidBrush(ForeColor))
        pevent.Graphics.DrawString(Text, Font, brush, 27, 4);

    Point pt = new Point( 4 ,  4);
    Rectangle rect = new Rectangle(pt, new Size(16, 16));

    pevent.Graphics.FillRectangle(Brushes.Beige, rect);

    if (Checked)
    {
        using (SolidBrush brush = new SolidBrush(ccol))
        using (Font wing = new Font("Wingdings", 12f))
            pevent.Graphics.DrawString("ü", wing, brush, 1,2);
    }
    pevent.Graphics.DrawRectangle(Pens.DarkSlateBlue, rect);

    Rectangle fRect = ClientRectangle;

    if (Focused)
    {
        fRect.Inflate(-1, -1);
        using (Pen pen = new Pen(Brushes.Gray) { DashStyle = DashStyle.Dot })
            pevent.Graphics.DrawRectangle(pen, fRect);
    }
}

You may need to tweek the sizes of the control and the font.. And if you want to you expand the code to honor the TextAlign and the CheckAlign properties.

And if you need a three-state control you can adapt the code to display a third state appearance, especially if you think of one that looks better than the original..

Answer 2

You have to write your own checkbox. By making a custom control in which there's a blue square(possibly inherits from Button) that toggles between checked and not checked images by an OnClick event and place a label next to it.