按钮 C# 中的圆角边缘 (WinForms)

问题描述

您好，通过这里和其他网站的一些研究，我制作了一个圆角按钮.

Hello, through some research around here and other sites, I've made a rounded edges button.

protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);
    Rectangle Rect = new Rectangle(0, 0, this.Width, this.Height);
    GraphicsPath GraphPath = new GraphicsPath();
    GraphPath.AddArc(Rect.X, Rect.Y, 50, 50, 180, 90);
    GraphPath.AddArc(Rect.X + Rect.Width - 50, Rect.Y, 50, 50, 270, 90);
    GraphPath.AddArc(Rect.X + Rect.Width - 50, Rect.Y + Rect.Height - 50, 50, 50, 0, 90);
    GraphPath.AddArc(Rect.X, Rect.Y + Rect.Height - 50, 50, 50, 90, 90);
    this.Region = new Region(GraphPath);
}

我面临的问题是按钮的蓝色突出显示":它显示在按钮的大部分上，但没有显示在圆形边缘，所以我的按钮部分突出显示，部分未突出显示(在按钮上边缘).我能做些什么来解决这个问题?谢谢.

The problem I'm facing is the button's "blue highlight": It shows on most of the button, but it doesn't show on the rounded edges, so my button is part highlighted and part non-highlighted (on the edges). What could I do to solve this? Thank you.

PS:我不能使用 WPF.该应用程序适用于一台非常旧的计算机；所以，请不要建议它.此外，客户没有钱购买更新的计算机.

PS: I can't use WPF. The application is for an very old computer; so, please, don't suggest it. Also, the client doesn't have the money to get a newer computer.

推荐答案

这是一个快速的方案，您可能想要微调并优化很多细节..

This is a quick one, you may want to fine tune things and optimize quite a few details..

class RoundedButton : Button
{
   GraphicsPath GetRoundPath(RectangleF Rect, int radius)
   {
      float r2 = radius / 2f;
      GraphicsPath GraphPath = new GraphicsPath();
      GraphPath.AddArc(Rect.X, Rect.Y, radius, radius, 180, 90);
      GraphPath.AddLine(Rect.X + r2, Rect.Y, Rect.Width - r2, Rect.Y);
      GraphPath.AddArc(Rect.X + Rect.Width - radius, Rect.Y, radius, radius, 270, 90);
      GraphPath.AddLine(Rect.Width, Rect.Y + r2, Rect.Width, Rect.Height - r2);
      GraphPath.AddArc(Rect.X + Rect.Width - radius,
                       Rect.Y + Rect.Height - radius, radius, radius, 0, 90);
      GraphPath.AddLine(Rect.Width - r2, Rect.Height, Rect.X + r2, Rect.Height);
      GraphPath.AddArc(Rect.X, Rect.Y + Rect.Height - radius, radius, radius, 90, 90);
      GraphPath.AddLine(Rect.X, Rect.Height - r2, Rect.X, Rect.Y + r2);
      GraphPath.CloseFigure();
      return GraphPath;
   }

   protected override void OnPaint(PaintEventArgs e)
   {
      base.OnPaint(e);
      RectangleF Rect = new RectangleF(0, 0, this.Width, this.Height);
      using (GraphicsPath GraphPath = GetRoundPath(Rect, 50))
      {
        this.Region = new Region(GraphPath);
        using (Pen pen = new Pen(Color.CadetBlue, 1.75f))
        {
            pen.Alignment = PenAlignment.Inset;
            e.Graphics.DrawPath(pen, GraphPath);
        }
      }
   }
}

显然，由于我们有一个类，我们可以将 GraphicsPath 缓存在一个类变量中.当然你选择颜色..

Obviously, since we have a class we can cache the GraphicsPath in a class variable. And of course you pick the color..

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