在按钮C＃圆边（的WinForms） [英] Rounded edges in button C# (WinForms)

问题描述

您好，经过一些研究在这里和其他网站，我做了一个圆边按钮。

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);
}

我现在面临的问题是按钮的蓝色突出：这表明在大多数按钮，但它不会对圆边表演，所以我的按钮部分高亮显示，部分非重点（上边缘）。我能做什么来解决这个？谢谢你。

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。该应用程序是一个很老的计算机;所以，请不要认为它。此外，客户端没有足够的资金来获得新的计算机。

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，您可能要微调的东西，并优化了不少细节。

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);
      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，因为我们有一个类，我们可以在一个类变量缓存的GraphicsPath 。当然，你挑颜色..

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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