Chat Message

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace HelpingHF_CS
{
    public class ChatBubble : Control
    {
        private Rectangle drawRect;

        public ChatBubble()
        {
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer |
                ControlStyles.SupportsTransparentBackColor | ControlStyles.UserPaint, true);

            this.BackColor = Color.Transparent;
            this.MinimumSize = new Size(200, 46);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

            var path = new GraphicsPath();
            path.AddArc(0, 0, 32, 32, 180, 90);
            path.AddArc(this.drawRect.Width - 42, 0, 32, 32, 270, 90);
            path.AddArc(this.drawRect.Width - 10, this.drawRect.Height - 32, 20, 32, 180, -90);
            path.AddArc(this.drawRect.Width - 16, this.drawRect.Height - 8, 32, 8, 90, 90);
            path.AddArc(this.drawRect.Width - 40, this.drawRect.Height - 8, 24, 8, 0, 90);
            path.AddArc(0, this.drawRect.Height - 32, 32, 32, 90, 90);
            path.CloseFigure();
            using (var fillBrush = new SolidBrush(Color.FromArgb(30, 150, 255)))
            {
                e.Graphics.FillPath(fillBrush, path);
            }
            using (var borderPen = new Pen(Color.FromArgb(35, 130, 220)))
            {
                e.Graphics.DrawPath(borderPen, path);
            }

            var textRect = new RectangleF(10, 10, this.drawRect.Width - 32, this.drawRect.Height - 20);
            e.Graphics.DrawString(this.Text, this.Font, Brushes.White, textRect);
        }

        protected override void OnSizeChanged(System.EventArgs e)
        {
            base.OnSizeChanged(e);
            ResetDrawRect();
        }

        protected void ResetDrawRect()
        {
            this.drawRect = new Rectangle(this.ClientRectangle.X,
                this.DisplayRectangle.Y,
                this.DisplayRectangle.Width - 1,
                this.DisplayRectangle.Height - 1);
        }
    }
}