c#在WinForm中重写ProgressBar控件（带%的显示）

c#在WinForm中重写ProgressBar控件（带%的显示）

2009-05-14 13:13

#region 定义textProgressBar控件的类     namespace csPublish     {         [ToolboxItem(true)]         class textProgressBar : System.Windows.Forms.ProgressBar         {             [System.Runtime.InteropServices.DllImport("user32.dll ")]             static extern IntPtr GetWindowDC(IntPtr hWnd);             [System.Runtime.InteropServices.DllImport("user32.dll ")]             static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);             private System.Drawing.Color _TextColor = System.Drawing.Color.Black;             private System.Drawing.Font _TextFont = new System.Drawing.Font("SimSun ", 12);             public System.Drawing.Color TextColor             {                 get { return _TextColor; }                 set { _TextColor = value; this.Invalidate(); }             }             public System.Drawing.Font TextFont             {                 get { return _TextFont; }                 set { _TextFont = value; this.Invalidate(); }             }             protected override void WndProc(ref   Message m)             {                 base.WndProc(ref   m);                 if (m.Msg == 0xf || m.Msg == 0x133)                 {                     //拦截系统消息，获得当前控件进程以便重绘。                       //一些控件（如TextBox、Button等）是由系统进程绘制，重载OnPaint方法将不起作用.                       //所有这里并没有使用重载OnPaint方法绘制TextBox边框。                       //                       //MSDN:重写   OnPaint   将禁止修改所有控件的外观。                       //那些由   Windows   完成其所有绘图的控件（例如   Textbox）从不调用它们的   OnPaint   方法，                       //因此将永远不会使用自定义代码。请参见您要修改的特定控件的文档，                       //查看   OnPaint   方法是否可用。如果某个控件未将   OnPaint   作为成员方法列出，                       //则您无法通过重写此方法改变其外观。                       //                       //MSDN:要了解可用的   Message.Msg、Message.LParam   和   Message.WParam   值，                       //请参考位于   MSDN   Library   中的   Platform   SDK   文档参考。可在   Platform   SDK（“Core   SDK”一节）                       //下载中包含的   windows.h   头文件中找到实际常数值，该文件也可在   MSDN   上找到。                       IntPtr hDC = GetWindowDC(m.HWnd);                     if (hDC.ToInt32() == 0)                     {                         return;                     }                     //base.OnPaint(e);                     System.Drawing.Graphics g = Graphics.FromHdc(hDC);                     SolidBrush brush = new SolidBrush(_TextColor);                     string s = string.Format("{0}%", this.Value * 100 / this.Maximum);                     SizeF size = g.MeasureString(s, _TextFont);                     float x = (this.Width - size.Width) / 2;                     float y = (this.Height - size.Height) / 2;                     g.DrawString(s, _TextFont, brush, x, y);                     //返回结果                       m.Result = IntPtr.Zero;                     //释放                       ReleaseDC(m.HWnd, hDC);                 }             }         }     }     #endregion

转载于:https://www.cnblogs.com/carekee/articles/2321985.html