using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace DevComponents.DotNetBar.Layout
{
    internal class InsertMarker : Control
    {
        #region Constructor
        /// <summary>
        /// Initializes a new instance of the InsertMarker class.
        /// </summary>
        public InsertMarker()
        {
            this.SetStyle(ControlStyles.UserPaint | ControlStyles.ResizeRedraw | ControlStyles.OptimizedDoubleBuffer, true);
        }
        #endregion

        #region Implementation
        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            using (SolidBrush brush = new SolidBrush(this.ForeColor))
            {
                g.FillRectangle(brush, new Rectangle(0, 0, this.Width, 2));
                g.FillRectangle(brush, new Rectangle(0, this.Height - 2, this.Width, 2));
                g.FillRectangle(brush, this.Width / 2 - 1, 0, 2, this.Height);
            }
            base.OnPaint(e);
        }
        protected override void OnHandleCreated(EventArgs e)
        {
            UpdateRegion();
            base.OnHandleCreated(e);
        }
        protected override void OnResize(EventArgs e)
        {
            UpdateRegion();
            base.OnResize(e);
        }
        private void UpdateRegion()
        {
            GraphicsPath path = new GraphicsPath();
            path.AddLine(0, 0, this.Width, 0);
            path.AddLine(this.Width, 0, this.Width, 2);
            path.AddLine(this.Width, 2, this.Width / 2 - 1, 2);
            path.AddLine(this.Width / 2 + 1, 2, this.Width / 2 + 1, this.Height-2);
            path.AddLine(this.Width / 2 + 1, this.Height - 2, this.Width, this.Height-2);
            path.AddLine(this.Width, this.Height - 2, this.Width, this.Height);
            path.AddLine(this.Width, this.Height, 0, this.Height);
            path.AddLine(0, this.Height, 0, this.Height-2);
            path.AddLine(0, this.Height - 2, this.Width/2-1, this.Height-2);
            path.AddLine(this.Width / 2 - 1, this.Height - 2, this.Width/2-1, 2);
            path.AddLine(this.Width / 2 - 1, 2, 0, 2);
            path.CloseAllFigures();

            Region reg = new Region();
            reg.MakeEmpty();
            reg.Union(path);

            path.Widen(SystemPens.Control);
            //Region r2 = new Region(path);
            reg.Union(path);

            this.Region = reg;
        }
        #endregion
    }
}