C#实现滑动开关效果

C#重绘checkbox生成滑动开关，供大家参考，具体内容如下

通过调用checkbox控件的paint事件，在重绘事件里判断checked属性，如果选中绘制选中图形，如果未选中绘制未选中图形。

效果图：

绘制圆角矩形方法：

/// <summary>
       /// 填充圆角矩形
       /// </summary>
       /// <param name="g"></param>
       /// <param name="brush"></param>
       /// <param name="rect"></param>
       /// <param name="cornerRadius"></param>
       public static void FillRoundRectangle(Graphics g, Brush brush, Rectangle rect, int cornerRadius)
       {
           using (GraphicsPath path = CreateRoundedRectanglePath(rect, cornerRadius))
           {
               g.FillPath(brush, path);
           }
       }
       /// <summary>
       /// 圆角矩形路径
       /// </summary>
       /// <param name="rect"></param>
       /// <param name="cornerRadius"></param>
       /// <returns></returns>
       internal static GraphicsPath CreateRoundedRectanglePath(Rectangle rect, int cornerRadius)
       {
           GraphicsPath roundedRect = new GraphicsPath();
           roundedRect.AddArc(rect.X, rect.Y, cornerRadius * 2, cornerRadius * 2, 180, 90);
           roundedRect.AddLine(rect.X + cornerRadius, rect.Y, rect.Right - cornerRadius * 2, rect.Y);
           roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y, cornerRadius * 2, cornerRadius * 2, 270, 90);
           roundedRect.AddLine(rect.Right, rect.Y + cornerRadius * 2, rect.Right, rect.Y + rect.Height - cornerRadius * 2);
           roundedRect.AddArc(rect.X + rect.Width - cornerRadius * 2, rect.Y + rect.Height - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 0, 90);
           roundedRect.AddLine(rect.Right - cornerRadius * 2, rect.Bottom, rect.X + cornerRadius * 2, rect.Bottom);
           roundedRect.AddArc(rect.X, rect.Bottom - cornerRadius * 2, cornerRadius * 2, cornerRadius * 2, 90, 90);
           roundedRect.AddLine(rect.X, rect.Bottom - cornerRadius * 2, rect.X, rect.Y + cornerRadius * 2);
           roundedRect.CloseFigure();
           return roundedRect;
       }

重绘代码：

private void RectangleCheckBoxButton(object sender, PaintEventArgs e)
{
           CheckBox rButton = (CheckBox)sender;
           Graphics g = e.Graphics;
           g.Clear(this.BackColor);

Rectangle RoundRect = new Rectangle(0, 0, 50, 30);            
           g.SmoothingMode = SmoothingMode.AntiAlias;
           //FillRoundRectangle(g, Brushes.White, radioButtonrect, 15);

if (rButton.Checked)
           {

Color color =Color.FromArgb( 55, 197, 90);
               Brush b1 = new SolidBrush(color);
               FillRoundRectangle(g, b1, RoundRect, 15);

using (Pen pen = new Pen(Color.FromArgb(255, 255, 255)))
               {            
                   FillRoundRectangle(g, Brushes.White, new Rectangle(22, 2,26, 26), 13);
               }
           }
           else
           {
               using (Pen pen = new Pen(Color.FromArgb(255, 255, 255)))
               {
                   FillRoundRectangle(g, Brushes.Silver,  RoundRect, 15);
                   FillRoundRectangle(g,Brushes.White, new Rectangle(2, 2, 26, 26), 13);

}
           }
           Font f = new Font("微软雅黑", 12);
           g.DrawString(((CheckBox)sender).Text,f ,  Brushes.White, new PointF(60, 6));
}

调用：

private void checkBox1_Paint(object sender, PaintEventArgs e)
{
RectangleCheckBoxButton(sender, e);
}

来源：https://blog.csdn.net/yx1234321/article/details/106207819