(更新时间)2021年5月20日 仓库温控系统(Winform) 10 扩展控件-panel

public partial class UPanel : Panel
{
        private const int WM_PAINT = 0xF;
        public UPanel()
        {
                InitializeComponent();
        }

        private Color bgColor = Color.Gray;

        /// <summary>
        /// 背景色（渐变色中，颜色1）
        /// </summary>
        [DefaultValue(typeof(Color), "Gray"), Description("控件背景色")]
        public Color BgColor
        {
                get { return bgColor; }
                set
                {
                        bgColor = value;
                        Invalidate();
                }
        }

        private Color borderColor = Color.Red;
        [DefaultValue(typeof(Color), "Gray"), Description("控件边框颜色")]
        public Color BorderColor
        {
                get { return borderColor; }
                set
                {
                        borderColor = value;
                        Invalidate();
                }
        }

        private int borderWidth = 0;
        [DefaultValue(typeof(int), "0"), Description("控件边框粗细")]
        public int BorderWidth
        {
                get { return borderWidth; }
                set
                {
                        borderWidth = value;
                        Invalidate();
                }
        }

        [DefaultValue(typeof(Color), "Gray"), Description("控件背景颜色2")]
        private Color bgColor2 = Color.White;
        public Color BgColor2
        {
                get { return bgColor2; }
                set
                {
                        bgColor2 = value;
                        Invalidate();
                }
        }


        [DefaultValue(typeof(int), "5"), Description("圆角弧度大小")]
        private int radius = 5;
        public int Radius
        {
                get { return radius; }
                set
                {
                        radius = value;
                        Invalidate();
                }
        }

        [DefaultValue(typeof(LinearGradientMode), "Vertical"), Description("渐变方式")]
        private LinearGradientMode gradientMode = LinearGradientMode.Vertical;
        public LinearGradientMode GradientMode
        {
                get { return gradientMode; }
                set
                {
                        gradientMode = value;
                        Invalidate();
                }
        }

        protected override void WndProc(ref Message m)
        {
                base.WndProc(ref m);
                if(m.Msg==WM_PAINT)
                {
                        if(this.Radius>0)
                        {
                                using (Graphics g = Graphics.FromHwnd(this.Handle))
                                {
                                        g.SmoothingMode = SmoothingMode.AntiAlias;
                                        Rectangle r = new Rectangle();
                                        r.Width = this.Width;
                                        r.Height = this.Height;
                                        DrawBorder(g, r, this.Radius);
                                }
                        }
                }
        }

        private void DrawBorder(Graphics g, Rectangle rect, int radius)
        {
                rect.Width -= 1;
                rect.Height -= 1;

                if (BorderWidth > 0)//边框粗细》0
                {
                        GraphicsPath path = new GraphicsPath();
                        path = PaintCommon.GetRoundRectangle(rect, radius);//绘制圆角矩形路径
                        using (Pen pen = new Pen(this.BorderColor, BorderWidth))
                        {
                                g.DrawPath(pen, path);
                        }
                }
                //背景区域的矩形
                Rectangle rect1 = new Rectangle(rect.X + BorderWidth, rect.Y + BorderWidth, rect.Width - 2* BorderWidth, rect.Height - 2* BorderWidth);
                DrawBackColor(g, rect1, radius);// 绘制背景
        }

        /// <summary>
        /// 绘制背景
        /// </summary>
        /// <param name="g"></param>
        /// <param name="rect"></param>
        /// <param name="radius"></param>
        private void DrawBackColor(Graphics g, Rectangle rect, int radius)
        {
                //获取背景区域的圆角矩形
                GraphicsPath path1 = PaintCommon.GetRoundRectangle(rect, radius);
                if (this.BgColor2 != Color.Transparent)
                {
                        //线型渐变画刷
                        LinearGradientBrush brush = new LinearGradientBrush(rect, BgColor, BgColor2, gradientMode);
                        g.FillPath(brush, path1);//填充圆角矩形内部
                }
                else
                {
                        Brush b = new SolidBrush(BgColor);
                        g.FillPath(b, path1);//填充圆角矩形内部
                }
        }
}