C# Winform实现圆角无锯齿按钮

本文实例为大家分享了C#Winform实现圆角无锯齿按钮的具体代码，供大家参考，具体内容如下发现用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...

本文实例为大家分享了C# Winform实现圆_{www.cppcns.com角无锯齿按钮的具体代码，供大家参考，具体内容如下}

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：

代码：

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.Flwww.cppcns.comatAppearance.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);
    }

   
   
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。