How to change tooltip text font size?-CodePudding

I changed in the properties OwnerDraw to true. and added the Draw event.

private void toolTip1_Draw(object sender, DrawToolTipEventArgs e)
{
    using (StringFormat sf = new StringFormat())
    {
        sf.Alignment = StringAlignment.Center;
        sf.LineAlignment = StringAlignment.Center;
        sf.HotkeyPrefix = System.Drawing.Text.HotkeyPrefix.None;
        sf.FormatFlags = StringFormatFlags.NoWrap;
        using (Font f = new Font("Tahoma", 12))
        {
           e.Graphics.DrawString(e.ToolTipText, f,
           SystemBrushes.ActiveCaptionText, e.Bounds, sf);
        }
     }
}

First time i put the mouse over a control with a tooltip the text is bigger but then next on other controls the tooltip get black :

before using the Draw event it was working fine but i want to resize the text font size.

CodePudding user response：

You need clear the graphics first.

e.Graphics.Clear(((Control)sender).BackColor);

Or just use the methods defined in DrawToolTipEventArgs

e.DrawBackground();
e.DrawBorder();