using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Work.UserComponents
{
    /// <summary>
    /// 可以改变边框颜色的groupbox
    /// </summary>
    public partial class UcGroupBoxEx : GroupBox
    {
        private Color _BorderColor = Color.FromArgb(33, 202, 99);
        private GroupBoxBorderStyle _BorderStyle = GroupBoxBorderStyle.ROUND;

        [Browsable(true), Description("边框颜色"), Category("自定义分组")]
        public Color BorderColor
        {
            get { return _BorderColor; }
            set
            {
                _BorderColor = value;
                this.Invalidate();
            }
        }

        [Browsable(true), Description("边框样式"), Category("自定义分组")]
        public GroupBoxBorderStyle BorderStyle
        {
            get { return _BorderStyle; }
            set
            {
                _BorderStyle = value;
                this.Invalidate();
            }
        }

        public UcGroupBoxEx()
        {
            InitializeComponent();
        }

        public UcGroupBoxEx(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }

        /// <summary>
        /// 重写OnPaint绘制自定义效果
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.Clear(this.BackColor);
            // 绘制字体
            e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit; // 或者 AntiAliasGridFit // 平滑字体
            e.Graphics.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), 10, 1);
            // 计算文本大小
            var vSize = e.Graphics.MeasureString(this.Text, this.Font);
            Pen vPen = new Pen(this._BorderColor);
            // 绘制矩形
            if (_BorderStyle == GroupBoxBorderStyle.SQUARE)
            {
                e.Graphics.DrawLine(vPen, 2, vSize.Height / 2, 8, vSize.Height / 2); // 标题左侧
                e.Graphics.DrawLine(vPen, vSize.Width + 8, vSize.Height / 2, this.Width - 3, vSize.Height / 2); // 标题右侧
                e.Graphics.DrawLine(vPen, 2, vSize.Height / 2, 2, this.Height - 3); // 左侧
                e.Graphics.DrawLine(vPen, 2, this.Height - 3, this.Width - 3, this.Height - 3); // 底部
                e.Graphics.DrawLine(vPen, this.Width - 3, vSize.Height / 2, this.Width - 3, this.Height - 3); // 右侧
            }
            // 绘制圆角矩形
            else
            {
                e.Graphics.DrawLine(vPen, 4, vSize.Height / 2, 8, vSize.Height / 2); // 标题左侧
                e.Graphics.DrawLine(vPen, vSize.Width + 8, vSize.Height / 2, this.Width - 5, vSize.Height / 2); // 标题右侧
                e.Graphics.DrawLine(vPen, 2, vSize.Height / 2 + 2, 2, this.Height - 5); // 左侧
                e.Graphics.DrawLine(vPen, 4, this.Height - 3, this.Width - 5, this.Height - 3); // 底部
                e.Graphics.DrawLine(vPen, this.Width - 3, vSize.Height / 2 + 2, this.Width - 3, this.Height - 5); // 右侧
                // 边角直线模拟圆角
                e.Graphics.DrawLine(vPen, 2, vSize.Height / 2 + 2, 4, vSize.Height / 2); // 左上角
                e.Graphics.DrawLine(vPen, this.Width - 5, vSize.Height / 2, this.Width - 3, vSize.Height / 2 + 2); // 右上角
                e.Graphics.DrawLine(vPen, this.Width - 3, this.Height - 5, this.Width - 5, this.Height - 3); // 右下角
                e.Graphics.DrawLine(vPen, 4, this.Height - 3, 2, this.Height - 5); // 左下角
            }
        }

        protected override void WndProc(ref Message m)
        { 
            base.WndProc(ref m);

            try
            {
                // WM_NCCALCSIZE 0x0083 当计算某个窗口的客户区大小和位置时发送此消息
                // windows消息值表,可参考:http://hi.baidu.com/dooy/blog/item/0e770a24f70e3b2cd407421b.html
                if (m.Msg == 0x83)
                {
                    this.Invalidate();
                }
            }
            catch { }
        }

        public enum GroupBoxBorderStyle
        {
            ROUND,
            SQUARE,
        }
    }
}