一個winform的華麗的圓角group控件

學習winform的自定義控件的開發時看的的一個控件的實現，完全的用戶自定義實現！是大家學習的好例子

先看截圖

標題欄是根據標題的字體來自動伸縮的。當然，標題也支持圖片！

主要代碼：

 private void PaintBack(System.Drawing.Graphics g)
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;


            int ArcWidth = this.C_RoundCorners * 2;
            int ArcHeight = this.C_RoundCorners * 2;
            int ArcX1 = 0;
            int ArcX2 = (this.ShadowControl) ? (this.Width - (ArcWidth + 1)) - this.ShadowThickness : this.Width - (ArcWidth + 1);
            int ArcY1=10;
            int ArcY2 = (this.ShadowControl) ? (this.Height - (ArcHeight + 1)) - this.ShadowThickness : this.Height - (ArcHeight + 1);

            System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
            System.Drawing.Brush BorderBrush = new SolidBrush(this.BorderColor);
            System.Drawing.Pen BorderPen = new Pen(BorderBrush,this.BorderThickness);
            System.Drawing.Drawing2D.LinearGradientBrush BackgroundGradientBrush = null;
            System.Drawing.Brush BackgroundBrush = new SolidBrush(this.BackgroundColor);
            System.Drawing.SolidBrush ShadowBrush = null;
            System.Drawing.Drawing2D.GraphicsPath ShadowPath = null;


            //畫出陰影效果
            if (this.ShadowControl)
            {
                ShadowBrush = new SolidBrush(this.ShadowColor);
                ShadowPath = new System.Drawing.Drawing2D.GraphicsPath();
                ShadowPath.AddArc(ArcX1+this.ShadowThickness,ArcY1+this.ShadowThickness,ArcWidth,ArcHeight,180,SweepAngle);//頂端的左角
                ShadowPath.AddArc(ArcX2+this.ShadowThickness,ArcY1+this.ShadowThickness,ArcWidth,ArcHeight,270,SweepAngle);//頂端右角
                ShadowPath.AddArc(ArcX2+this.ShadowThickness,ArcY2+this.ShadowThickness,ArcWidth,ArcHeight,360,SweepAngle);//底部右角
                ShadowPath.AddArc(ArcX1+this.ShadowThickness,ArcY2+this.ShadowThickness,ArcWidth,ArcHeight,90,SweepAngle);//底部左角 
                ShadowPath.CloseAllFigures();

                g.FillPath(ShadowBrush,ShadowPath); 
            }

            //畫出圖形
            path.AddArc(ArcX1,ArcY1,ArcWidth,ArcHeight,180,SweepAngle);
            path.AddArc(ArcX2,ArcY1,ArcWidth,ArcHeight,270,SweepAngle);
            path.AddArc(ArcX2,ArcY2,ArcWidth,ArcHeight,360,SweepAngle); 
            path.AddArc(ArcX1,ArcY2, ArcWidth, ArcHeight,90, SweepAngle);
            path.CloseAllFigures();

            if (this.C_BackgroundGradientMode == GroupBoxGradientMode.None)
            {
                g.FillPath(BackgroundBrush, path);
            }
            else {
                BackgroundGradientBrush = new LinearGradientBrush(new Rectangle(0,0,this.Width,this.Height),this.BackgroundColor,this.BackgroundGradientColor,(LinearGradientMode)this.BackgroundGradientMode);

                g.FillPath(BackgroundGradientBrush,path);
            }
            //畫邊框
            g.DrawPath(BorderPen,path);
            //銷燬Graphic 對象
            if (path != null) 
            {
                path.Dispose(); 
            }
            if (BorderBrush != null)
            {
                BorderPen.Dispose();
            }
            if (BorderPen != null)
            {
                BorderPen.Dispose();
            }

            if (BackgroundGradientBrush != null) 
            {
                BackgroundGradientBrush.Dispose(); 
            }
            if (BackgroundBrush != null)
            {
                BackgroundBrush.Dispose();
            }
            if (ShadowBrush != null)
            {
                ShadowBrush.Dispose();
            }
            if (ShadowPath != null)
            {
                ShadowPath.Dispose();
            } 
        }

代碼太多，提供下載：

下載鏈接地址