Winform控件优化之圆角按钮2

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

namespace CMControls
{
    public class ButtonPro : Button
    {
        private int roundRadius;//半径 

        private bool showCusp = false;//显示尖角
        private RectangleAlign cuspAlign = RectangleAlign.RightTop;//三角尖角位置

        private Color roundBorderColor = Color.Black;//边框颜色
        private int roundBorderWidth = 0;//边框宽度

        private Color roundHoverColor = Color.FromArgb(220, 80, 80);//鼠标位于控件时颜色
        private Color roundNormalColor = Color.FromArgb(51, 161, 224);//基颜色
        private Color roundPressedColor = Color.FromArgb(251, 161, 0);//鼠标按下控件时基颜色

        // 鼠标相对控件的状态位置，对应上面不同颜色
        private MouseControlState mouseControlState = MouseControlState.Normal;

        private bool regionNewModel = false; // 创建新Region的模式，使用"绘制范围"创建新的Region，实现控件区域贴合绘制范围，实现图形外的部分"正确的透明"，但相对会有些锯齿

        private Color beginBGColor; //= Color.FromArgb(251, 161, 0);//渐变开始色
        private Color endBGColor; //= Color.FromArgb(251, 161, 0);//渐变结束色
        private bool enableBGGradient = false; //使用渐变色
        private LinearGradientMode gradientModel = LinearGradientMode.Vertical; //线性渐变的模式

        private Region originRegion;

        /// <summary>
        /// 圆形按钮的半径属性
        /// </summary>
        [CategoryAttribute("高级"), DefaultValue(20), Description("圆角半径，>=0时启用圆角按钮，等于0为直角(但可使用背景色等所有Round圆角相关属性)，<0时使用默认Button样式")]
        public int RoundRadius
        {
            set
            {
                roundRadius = value;
                // 使控件的整个画面无效并重绘控件
                this.Invalidate();
            }
            get
            {
                return roundRadius;
            }
        }
        /// <summary>
        /// 圆角下创建新Region模式
        /// </summary>
        [CategoryAttribute("高级"), DefaultValue(false), Description("创建新Region的模式，使用'绘制范围'创建新的Region，实现控件区域贴合绘制范围，实现'正确的透明'，但相对会有些的锯齿")]
        public bool RegionNewModel
        {
            set
            {
                regionNewModel = value;
                this.Invalidate();
            }
            get
            {
                return regionNewModel;
            }
        }

        /// <summary>
        /// 三角尖角位置，当启用圆角
        /// </summary>
        [CategoryAttribute("高级"), Description("(三角)尖角的显示位置，当启用圆角按钮(RoundRadius>=0)，且显示尖角时有效"), DefaultValue(RectangleAlign.RightTop)]
        public RectangleAlign CuspAlign
        {
            set
            {
                cuspAlign = value;
                this.Invalidate();
            }
            get
            {
                return cuspAlign;
            }
        }
        [CategoryAttribute("高级"), Description("是否显示尖角，默认不显示，当启用Radius圆角(RoundRadius>=0)时才有效"), DefaultValue(false)]
        public bool ShowCusp
        {
            set
            {
                showCusp = value;
                this.Invalidate();
            }
            get
            {
                return showCusp;
            }
        }

        [CategoryAttribute("高级"), DefaultValue(0), Description("启用Radius圆角(RoundRadius>=0)时边框宽度，默认0")]
        public int RoundBorderWidth
        {
            set
            {
                roundBorderWidth = value;
                this.Invalidate();
            }
            get
            {
                return roundBorderWidth;
            }
        }

        [CategoryAttribute("高级"), DefaultValue(typeof(Color), "0, 0, 0"), Description("启用Radius圆角(RoundRadius>=0)时边框颜色，默认黑色")]
        public Color RoundBorderColor
        {
            get
            {
                return this.roundBorderColor;
            }
            set
            {
                this.roundBorderColor = value;
                this.Invalidate();
            }
        }

        /// <summary>
        /// 是否启用背景渐变色，启用后RoundNormalColor、RoundHoverColor、RoundPressedColor颜色无效
        /// </summary>
        [CategoryAttribute("高级"), DefaultValue(false), Description("启用渐变背景色(需要RoundRadius>=0)，启用后RoundNormalColor、RoundHoverColor、RoundPressedColor颜色无效")]
        public bool EnableBGGradient
        {
            get
            {
                return this.enableBGGradient;
            }
            set
            {
                this.enableBGGradient = value;
                this.Invalidate();
            }
        }
        /// <summary>
        /// 线性渐变的模式，默认垂直渐变
        /// </summary>
        [CategoryAttribute("高级"), DefaultValue(LinearGradientMode.Vertical), Description("线性渐变的模式，默认垂直渐变")]
        public LinearGradientMode GradientModel
        {
            get
            {
                return this.gradientModel;
            }
            set
            {
                this.gradientModel = value;
                this.Invalidate();
            }
        }

        /// <summary>
        /// 背景渐变色
        /// </summary>
        [CategoryAttribute("高级"), DefaultValue(typeof(Color), "0, 122, 204"), Description("渐变开始色")]
        public Color BGColorBegin
        {
            get
            {
                return this.beginBGColor;
            }
            set
            {
                this.beginBGColor = value;
                this.Invalidate();
            }
        }
        /// <summary>
        /// 背景渐变色
        /// </summary>
        [CategoryAttribute("高级"), DefaultValue(typeof(Color), "8, 39, 57"), Description("渐变结束色")]
        public Color BGColorEnd
        {
            get
            {
                return this.endBGColor;
            }
            set
            {
                this.endBGColor = value;
                this.Invalidate();
            }
        }

        [CategoryAttribute("高级"), DefaultValue(typeof(Color), "51, 161, 224"), Description("启用Radius圆角(RoundRadius>=0)时按钮标准颜色")]
        public Color RoundNormalColor
        {
            get
            {
                return this.roundNormalColor;
            }
            set
            {
                this.roundNormalColor = value;
                this.Invalidate();
            }
        }
        [CategoryAttribute("高级"), DefaultValue(typeof(Color), "220, 80, 80"), Description("启用Radius圆角(RoundRadius>=0)鼠标位于按钮上时的按钮颜色")]
        public Color RoundHoverColor
        {
            get
            {
                return this.roundHoverColor;
            }
            set
            {
                this.roundHoverColor = value;
                this.Invalidate();
            }
        }

        [CategoryAttribute("高级"), DefaultValue(typeof(Color), "251, 161, 0"), Description("启用Radius圆角(RoundRadius>=0)鼠标按下时的按钮颜色")]
        public Color RoundPressedColor
        {
            get
            {
                return this.roundPressedColor;
            }
            set
            {
                this.roundPressedColor = value;
                this.Invalidate();
            }
        }
        protected override void OnMouseEnter(EventArgs e)//鼠标进入时
        {
            mouseControlState = MouseControlState.Hover;//Hover
            base.OnMouseEnter(e);
        }
        protected override void OnMouseLeave(EventArgs e)//鼠标离开
        {
            mouseControlState = MouseControlState.Normal;//正常
            base.OnMouseLeave(e);
        }
        protected override void OnMouseDown(MouseEventArgs e)//鼠标按下
        {
            if (e.Button == MouseButtons.Left && e.Clicks == 1)//鼠标左键且点击次数为1
            {
                mouseControlState = MouseControlState.Pressed;//按下的状态
            }
            base.OnMouseDown(e);
        }

        protected override void OnMouseUp(MouseEventArgs e)//鼠标弹起
        {
            if (e.Button == MouseButtons.Left && e.Clicks == 1)
            {
                if (ClientRectangle.Contains(e.Location))//控件区域包含鼠标的位置
                {
                    mouseControlState = MouseControlState.Hover;
                }
                else
                {
                    mouseControlState = MouseControlState.Normal;
                }
            }
            base.OnMouseUp(e);
        }
        public ButtonPro()
        {
            ForeColor = Color.White;

            this.FlatStyle = FlatStyle.Flat;
            this.FlatAppearance.BorderSize = 0;

            FlatAppearance.MouseDownBackColor = Color.Transparent;
            FlatAppearance.MouseOverBackColor = Color.Transparent;
            FlatAppearance.CheckedBackColor = Color.Transparent;

            RoundRadius = 20; // 似乎当值为默认20时重新生成设计器或者重新打开项目后，此属性就会变为0，必须在构造函数中指定20来解决

            this.mouseControlState = MouseControlState.Normal;

            // 原始Region
            originRegion = Region;
        }

        public override void NotifyDefault(bool value)
        {
            base.NotifyDefault(false); // 去除窗体失去焦点时最新激活的按钮边框外观样式
        }

        //重写OnPaint
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            //base.OnPaintBackground(e);


            // 不能使用 e.ClipRectangle.GetRoundedRectPath(_radius) 计算控件全部的Region区域，e.ClipRectangle 似乎是变化的，必须使用固定的Width和Height，包括下面的绘制也不能使用e.ClipRectangle
            // 在Paint事件中也不推荐使用e.ClipRectangle时没问题的
            Rectangle controlRect = new Rectangle(0, 0, this.Width, this.Height);

            // roundRadius 修改回来是要还原
            if (roundRadius >= 0 && regionNewModel) // 圆角下创建新Region模式，使用自定义Region
            {
                var controlPath = controlRect.GetRoundedRectPath(roundRadius);

                // 要在绘制之前指定Region，否则无效
                this.Region = new Region(controlPath);
            }
            else // 修改对应调整
            {
                //this.Region = new Region(controlRect);//也属于重新修改
                this.Region = originRegion;
            }

            if (roundRadius >= 0)
            {
                Rectangle rect;

                if (enableBGGradient)
                {
                    rect = e.Graphics.DrawRoundRectAndCusp(controlRect, roundRadius, beginBGColor, endBGColor, true, CuspAlign, gradientModel, roundBorderWidth > 0 ? new Pen(roundBorderColor, roundBorderWidth) : null);
                }
                else
                {
                    Color baseColor;

                    switch (mouseControlState)
                    {
                        case MouseControlState.Hover:
                            baseColor = this.roundHoverColor;
                            break;
                        case MouseControlState.Pressed:
                            baseColor = this.roundPressedColor;
                            break;
                        case MouseControlState.Normal:
                            baseColor = this.roundNormalColor;
                            break;
                        default:
                            baseColor = this.roundNormalColor;
                            break;
                    }
                    rect = e.Graphics.DrawRoundRectAndCusp(controlRect, roundRadius, baseColor, showCusp, cuspAlign, roundBorderWidth > 0 ? new Pen(roundBorderColor, roundBorderWidth) : null);

                }

                // 使用合适的区域
                e.Graphics.DrawText(rect, Text, ForeColor, Font, TextAlign);
            }
        }
    }
}

        using (StringFormat strF = StringFormat.GenericTypographic)
        {
            // 文字布局
            switch (_textAlign)
            {
                //...
            }
            g.DrawString(text, font, brush, rect, strF);
        }

// ...
TextRenderer.DrawText(g, text, font, rect, color, formatFlags);