?

??? #region 定義textProgressBar控件的類

??? 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)

??????????????? {

??????????????????? //攔截系統消息，獲得當前控件進程以便重繪。??

??????????????????? //一些控件（如TextBox、Button等）是由系統進程繪制，重載OnPaint方法將不起作用.??

??????????????????? //所有這里并沒有使用重載OnPaint方法繪制TextBox邊框。??

??????????????????? //??

??????????????????? //MSDN:重寫?? OnPaint?? 將禁止修改所有控件的外觀。??

??????????????????? //那些由?? Windows?? 完成其所有繪圖的控件（例如?? Textbox）從不調用它們的?? OnPaint?? 方法，??

??????????????????? //因此將永遠不會使用自定義代碼。請參見您要修改的特定控件的文檔，??

??????????????????? //查看?? OnPaint?? 方法是否可用。如果某個控件未將?? OnPaint?? 作為成員方法列出，??

??????????????????? //則您無法通過重寫此方法改變其外觀。??

??????????????????? //??

??????????????????? //MSDN:要了解可用的?? Message.Msg、Message.LParam?? 和?? Message.WParam?? 值，??

??????????????????? //請參考位于?? MSDN?? Library?? 中的?? Platform?? SDK?? 文檔參考?？稍?? Platform?? SDK（“Core?? SDK”一節）??

??????????????????? //下載中包含的?? windows.h?? 頭文件中找到實際常數值，該文件也可在?? 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);

??????????????????? //返回結果??

??????????????????? m.Result = IntPtr.Zero;

??????????????????? //釋放??

??????????????????? ReleaseDC(m.HWnd, hDC);

??????????????? }

??????????? }

??????? }

??? }

??? #endregion