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);
}
