using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace winformTest

{

    public partial class XButton : Button

    {

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.IContainer components = null;

        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

        /// <summary>

        /// 设计器支持所需的方法 - 不要修改

        /// 使用代码编辑器修改此方法的内容。

        /// </summary>

        private void InitializeComponent()

        {

            components = new System.ComponentModel.Container();

        }

        enum model

        {

            hover,

            enter,

            press,

            enable

        }

        public Color HoverBackColor { get; set; }

        public Color EnterBackColor { get; set; }

        public Color PressBackColor { get; set; }

        public Color HoverForeColor { get; set; }

        public Color EnterForeColor { get; set; }

        public Color PressForeColor { get; set; }

        public int Radius { get; set; }

        model paintmodel = model.hover;

        public XButton()

        {

            InitializeComponent();

            //这些得带上，不然会有黑边

            FlatStyle = FlatStyle.Flat;

            FlatAppearance.BorderSize = ;

            FlatAppearance.BorderColor = Color.FromArgb(, , , );

            FlatAppearance.MouseDownBackColor = Color.Transparent;

            FlatAppearance.MouseOverBackColor = Color.Transparent;

            SetDefaultColor();

        }

        public void SetDefaultColor()

        {//给个初始值

            HoverBackColor = Color.LightBlue;

            EnterBackColor = Color.Blue;

            PressBackColor = Color.DarkBlue;

            HoverForeColor = Color.White;

            EnterForeColor = Color.White;

            PressForeColor = Color.White;

            Radius = ;

        }

        protected override void OnPaint(PaintEventArgs e)

        {

            base.OnPaint(e);//这个不能去，而且得放在前面，不然会有黑框之类的莫名其妙的东西

            var colorback = HoverBackColor;

            var colorfore = HoverForeColor;

            switch (paintmodel)

            {

                case model.hover:

                    colorback = HoverBackColor;

                    colorfore = HoverForeColor;

                    break;

                case model.enter:

                    colorback = EnterBackColor;

                    colorfore = EnterForeColor;

                    break;

                case model.press:

                    colorback = PressBackColor;

                    colorfore = PressForeColor;

                    break;

                case model.enable:

                    colorback = Color.LightGray;

                    break;

                default:

                    colorback = HoverBackColor;

                    colorfore = HoverForeColor;

                    break;

            }

            Draw(e.ClipRectangle, e.Graphics, false, colorback);

            DrawText(e.ClipRectangle, e.Graphics, colorfore);

        }

        protected override void OnMouseEnter(EventArgs e)

        {

            paintmodel = model.enter;

            base.OnMouseEnter(e);

        }

        protected override void OnMouseLeave(EventArgs e)

        {

            paintmodel = model.hover;

            base.OnMouseLeave(e);

        }

        protected override void OnMouseDown(MouseEventArgs mevent)

        {

            paintmodel = model.press;

            base.OnMouseDown(mevent);

        }

        protected override void OnEnabledChanged(EventArgs e)

        {

            paintmodel = Enabled ? model.hover : model.enable;

            Invalidate();//false 转换为true的时候不会刷新 这里强制刷新下

            base.OnEnabledChanged(e);

        }

        void Draw(Rectangle rectangle, Graphics g, bool cusp, Color begin_color, Color? end_colorex = null)

        {

            Color end_color = end_colorex == null ? begin_color : (Color)end_colorex;

            int span = ;

            //抗锯齿

            g.SmoothingMode = SmoothingMode.AntiAlias;

            //渐变填充

            LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush(rectangle, begin_color, end_color, LinearGradientMode.Vertical);

            //画尖角

            if (cusp)

            {

                span = ;

                PointF p1 = new PointF(rectangle.Width - , rectangle.Y + );

                PointF p2 = new PointF(rectangle.Width - , rectangle.Y + );

                PointF p3 = new PointF(rectangle.Width, rectangle.Y + );

                PointF[] ptsArray = { p1, p2, p3 };

                g.FillPolygon(myLinearGradientBrush, ptsArray);

            }

            //填充

            g.FillPath(myLinearGradientBrush, DrawRoundRect(rectangle.X, rectangle.Y, rectangle.Width - span, rectangle.Height - , Radius));

        }

        void DrawText(Rectangle rectangle, Graphics g, Color color)

        {

            SolidBrush sbr = new SolidBrush(color);

            var rect = new RectangleF();

            switch (TextAlign)

            {

                case ContentAlignment.MiddleCenter:

                    rect = getTextRec(rectangle, g);

                    break;

                default:

                    rect = getTextRec(rectangle, g);

                    break;

            }

            g.DrawString(Text, Font, sbr, rect);

        }

        RectangleF getTextRec(Rectangle rectangle, Graphics g)

        {

            var rect = new RectangleF();

            var size = g.MeasureString(Text, Font);

            if (size.Width > rectangle.Width || size.Height > rectangle.Height)

            {

                rect = rectangle;

            }

            else

            {

                rect.Size = size;

                rect.Location = new PointF(rectangle.X + (rectangle.Width - size.Width) / , rectangle.Y + (rectangle.Height - size.Height) / );

            }

            return rect;

        }

        GraphicsPath DrawRoundRect(int x, int y, int width, int height, int radius)

        {

            //四边圆角

            GraphicsPath gp = new GraphicsPath();

            gp.AddArc(x, y, radius, radius, , );

            gp.AddArc(width - radius, y, radius, radius, , );

            gp.AddArc(width - radius, height - radius, radius, radius, , );

            gp.AddArc(x, height - radius, radius, radius, , );

            gp.CloseAllFigures();

            return gp;

        }

    }

}