GroupPanel美化扩展----------WinForm控件开发系列

 该控件是继承于 Control 基类开发的。主要添加做标题栏，标题栏包括图标和文本，目前边框不可以调整，如果你有需要动态调整边框，你可以继续完善这个控件。

该控件的标题和边框是属于非工作区绘制的。

非工作区的绘制主要是靠拦截 Window 消息完成如下

        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_NCCALCSIZE:
                    {
                        if (m.WParam != IntPtr.Zero)
                        {
                            NCCALCSIZE_PARAMS ncsize = (NCCALCSIZE_PARAMS)Marshal.PtrToStructure(m.LParam, typeof(NCCALCSIZE_PARAMS));
                            ncsize.ncOldClientRectangle.Top = ncsize.ncNewRectangle.Top += this.titleHeight;
                            ncsize.ncOldClientRectangle.Left = ncsize.ncNewRectangle.Left += this.border;
                            ncsize.ncOldClientRectangle.Right = ncsize.ncNewRectangle.Right -= this.border;
                            ncsize.ncOldClientRectangle.Bottom = ncsize.ncNewRectangle.Bottom -= this.border;
                            Marshal.StructureToPtr(ncsize, m.LParam, false);
                        }
                        else
                        {
                            RECT ncsize = (RECT)Marshal.PtrToStructure(m.LParam, typeof(RECT));
                            ncsize.Top += this.titleHeight;
                            ncsize.Left += this.border;
                            ncsize.Right -= this.border;
                            ncsize.Bottom -= this.border;
                            Marshal.StructureToPtr(ncsize, m.LParam, false);
                        }

                        this.Send_WM_NCPAINT_Message();
                        return;
                    }
                case WM_NCPAINT:
                case WM_NCACTIVATE:
                    {
                        this.NCInvalidate();
                        return;
                    }
            }
            base.WndProc(ref m);
        }

再定义重绘非工作区 如下

        /// <summary>
        /// 绘制非工作区域
        /// </summary>
        protected virtual void OnNCPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            #region 边框
            if (this.border > 0)
            {
                Pen border_pen = new Pen(this.BorderColor, this.border);
                g.DrawLine(border_pen, new PointF(g.VisibleClipBounds.X, g.VisibleClipBounds.Bottom - this.border / 2), new PointF(g.VisibleClipBounds.Right, g.VisibleClipBounds.Bottom - this.border / 2));
                g.DrawLine(border_pen, new PointF(g.VisibleClipBounds.X + this.border / 2, g.VisibleClipBounds.Y + this.titleHeight), new PointF(g.VisibleClipBounds.X + this.border / 2, g.VisibleClipBounds.Bottom));
                g.DrawLine(border_pen, new PointF(g.VisibleClipBounds.Right - this.border / 2, g.VisibleClipBounds.Y+this.titleHeight), new PointF(g.VisibleClipBounds.Right - this.border / 2, g.VisibleClipBounds.Bottom));
                border_pen.Dispose();
            }
            #endregion

            #region 标题
            SolidBrush title_back_sb = new SolidBrush(this.TitleBackColor);
            RectangleF title_rect = new RectangleF(g.VisibleClipBounds.X, g.VisibleClipBounds.Y, g.VisibleClipBounds.Width, this.titleHeight);
            g.FillRectangle(title_back_sb, title_rect);
            title_back_sb.Dispose();

            #region 标题图标
            if (this.TitleImage != null)
            {
                int image_w = this.TitleImage.Width;
                int image_h = this.TitleImage.Height;
                g.DrawImage(this.TitleImage, new RectangleF(g.VisibleClipBounds.X + this.border, g.VisibleClipBounds.Y + (this.titleHeight - image_h) / 2, image_w, image_h));
            }
            #endregion

            #region 标题文本
            if (!String.IsNullOrWhiteSpace(Title))
            {
                SolidBrush title_text_sb = new SolidBrush(this.TitleTextColor);
                SizeF text_size = g.MeasureString(this.Title, this.TitleFont);
                RectangleF text_rect = RectangleF.Empty;
                if (this.TitleAlign == TitleAligns.Left)
                {
                    int image_w = this.TitleImage == null ? 0 : this.TitleImage.Width;
                    text_rect = new RectangleF(g.VisibleClipBounds.X + this.border + image_w + 5, g.VisibleClipBounds.Y + (this.titleHeight - text_size.Height) / 2f, text_size.Width, text_size.Height);
                }
                else if (this.TitleAlign == TitleAligns.Center)
                {
                    text_rect = new RectangleF(g.VisibleClipBounds.X + (g.VisibleClipBounds.Width - text_size.Width) / 2f, g.VisibleClipBounds.Y + (this.titleHeight - text_size.Height) / 2f, text_size.Width, text_size.Height);
                }
                else
                {
                    text_rect = new RectangleF(g.VisibleClipBounds.Right - text_size.Width - this.border, g.VisibleClipBounds.Y + (this.titleHeight - text_size.Height) / 2f, text_size.Width, text_size.Height);
                }
                g.DrawString(this.Title, this.TitleFont, title_text_sb, text_rect);
                title_text_sb.Dispose();
            }
            #endregion

            #endregion

        }


        /// <summary>
        /// 重新绘制非工作区
        /// </summary>
        private void NCInvalidate()
        {
            IntPtr hDC = GetWindowDC(this.Handle);
            Graphics g = Graphics.FromHdc(hDC);
            this.OnNCPaint(new PaintEventArgs(g, new Rectangle(0, 0, this.Width, this.Height)));
            g.Dispose();
            ReleaseDC(this.Handle, hDC);
        }

        /// <summary>
        /// 发送非工作区绘制信息
        /// </summary>
        private void Send_WM_NCPAINT_Message()
        {
            SendMessage(this.Handle, WM_NCPAINT, (IntPtr)1, (IntPtr)0);
        }

 新增属性如下

控件库的源码已整体发布到gitee，下载地址：（花木兰控件库）https://gitee.com/tlmbem/hml