C# Winform实现圆角无锯齿按钮

前言：

发现用Winform做一个圆角按钮遇到麻烦，主要是锯齿问题，后面想了想办法解决问题了。

主要方法是按钮的区域通过Region指定，但按钮需要自己画，否则怎么搞都出现锯齿，网上有朋友提供一个漂亮的方案，可是代码不完整无法使用，我的解决方案现在分享如下：

  public enum ControlState { Hover , Normal, Pressed }
    public class RoundButton : Button
    {
             private int radius;//半径 
        private Color _baseColor = Color.FromArgb(51, 161, 224);//基颜色
        private Color _hoverColor= Color.FromArgb(51, 0, 224);//基颜色
        private Color _normalColor = Color.FromArgb(0, 161, 224);//基颜色
        private Color _pressedColor = Color.FromArgb(51, 161, 0);//基颜色
        //圆形按钮的半径属性
        [CategoryAttribute("布局"), BrowsableAttribute(true), ReadOnlyAttribute(false)]
        public int Radius
        {
            set
            {
                radius = value;
                this.Invalidate();
            }
            get
            {
                return radius;
            }
        }
        [DefaultValue(typeof(Color), "51, 161, 224")]
        public Color NormalColor
        {
            get
            {
                return this._normalColor;
            }
            set
            {
                this._normalColor = value;
                this.Invalidate();
            }
        }
      //  [DefaultValue(typeof(Color), "220, 80, 80")]
        public Color HoverColor {
            get
            {
                return this._hoverColor;
            }
            set
            {
                this._hoverColor = value;
                this.Invalidate();
            }
        }
 
      //  [DefaultValue(typeof(Color), "251, 161, 0")]
        public Color PressedColor {
            get
            {
                return this._pressedColor;
            }
            set
            {
                this._pressedColor = value;
                this.Invalidate();
            }
        }
        public ControlState ControlState { get; set; }
        protected override void OnMouseEnter(EventArgs e)//鼠标进入时
        {
            base.OnMouseEnter(e);
            ControlState = ControlState.Hover;//正常
        }
        protected override void OnMouseLeave(EventArgs e)//鼠标离开
        {
            base.OnMouseLeave(e);
            ControlState = ControlState.Normal;//正常
        }
        protected override void OnMouseDown(MouseEventArgs e)//鼠标按下
        {
            base.OnMouseDown(e);
            if (e.Button == MouseButtons.Left && e.Clicks == 1)//鼠标左键且点击次数为1
            {
                ControlState = ControlState.Pressed;//按下的状态
            }
        }
        protected override void OnMouseUp(MouseEventArgs e)//鼠标弹起
        {
            base.OnMouseUp(e);
            if (e.Button == MouseButtons.Left && e.Clicks == 1)
            {
                if (ClientRectangle.Contains(e.Location))//控件区域包含鼠标的位置
                {
                    ControlState = ControlState.Hover;
                }
                else
                {
                    ControlState = ControlState.Normal;
                }
            }
        }
        public RoundButton()
        {
            Radius = 15;
            this.FlatStyle = FlatStyle.Flat;
            this.FlatAppearance.BorderSize = 0;
            this.ControlState = ControlState.Normal;
            this.SetStyle(
             ControlStyles.UserPaint |  //控件自行绘制，而不使用操作系统的绘制
             ControlStyles.AllPaintingInWmPaint | //忽略擦出的消息，减少闪烁。
             ControlStyles.OptimizedDoubleBuffer |//在缓冲区上绘制，不直接绘制到屏幕上，减少闪烁。
             ControlStyles.ResizeRedraw | //控件大小发生变化时，重绘。                  
             ControlStyles.SupportsTransparentBackColor, true);//支持透明背景颜色
        }
 
        private Color GetColor(Color colorBase, int a, int r, int g, int b)
        {
            int a0 = colorBase.A;
            int r0 = colorBase.R;
            int g0 = colorBase.G;
            int b0 = colorBase.B;
            if (a + a0 > 255) { a = 255; } else { a = Math.Max(a + a0, 0); }
            if (r + r0 > 255) { r = 255; } else { r = Math.Max(r + r0, 0); }
            if (g + g0 > 255) { g = 255; } else { g = Math.Max(g + g0, 0); }
            if (b + b0 > 255) { b = 255; } else { b = Math.Max(b + b0, 0); }
 
            return Color.FromArgb(a, r, g, b);
        }
 
        //重写OnPaint
        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
        {
            base.OnPaint(e);
            base.OnPaintBackground(e);
            e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
            e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
 
            e.Graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
 
            Rectangle rect = new Rectangle(0, 0, this.Width, this.Height);
            var path = GetRoundedRectPath(rect, radius);
 
            this.Region = new Region(path);
 
            Color baseColor;
            //Color borderColor;
            //Color innerBorderColor = this._baseColor;//Color.FromArgb(200, 255, 255, 255); ;
 
            switch (ControlState)
            {
                case ControlState.Hover:
                    baseColor = this.HoverColor;
                    break;
                case ControlState.Pressed:
                    baseColor = this.PressedColor;
                    break;
                case ControlState.Normal:
                    baseColor = this.NormalColor;
                    break;
                default:
                    baseColor = this.NormalColor;
                    break;
            }
 
            using (SolidBrush b = new SolidBrush(baseColor))
            {
                e.Graphics.FillPath(b, path);
                Font fo = new Font("宋体", 10.5F);
                Brush brush = new SolidBrush(this.ForeColor);
                StringFormat gs = new StringFormat();
                gs.Alignment = StringAlignment.Center; //居中
                gs.LineAlignment = StringAlignment.Center;//垂直居中
                e.Graphics.DrawString(this.Text, fo, brush, rect, gs);
                //  e.Graphics.DrawPath(p, path);
            }
        }
        private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)
        {
            int diameter = radius;
            Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));
            GraphicsPath path = new GraphicsPath();
            path.AddArc(arcRect, 180, 90);
            arcRect.X = rect.Right - diameter;
            path.AddArc(arcRect, 270, 90);
            arcRect.Y = rect.Bottom - diameter;
            path.AddArc(arcRect, 0, 90);
            arcRect.X = rect.Left;
            path.AddArc(arcRect, 90, 90);
            path.CloseFigure();
            return path;
        }
         protected override void OnSizeChanged(EventArgs e)
        {
            base.OnSizeChanged(e);
        }
    }

到此这篇关于C# Winform实现圆角无锯齿按钮的文章就介绍到这了,更多相关C# Winform内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！