如何使CStatic控件（MFC）透明？ [英] How to make a CStatic control (MFC) transparent?

问题描述

我的应用程序有一个启动对话框，其中包含填充整个对话框的图像。另外还有一个CStatic控件，它显示用户的一些变量信息。我通过以下代码使CStatic控件透明：

  HBRUSH CStartbildDlg :: OnCtlColor（CDC * pDC，CWnd * pWnd，UINT nCtlColor ）
 {
 if（pWnd-> GetDlgCtrlID（）== IDC_STATIC_INFO）
 {
 pDC-> SetBkMode（TRANSPARENT）; 
 return reinterpret_cast< HBRUSH>（:: GetStockObject（NULL_BRUSH））; 
} 
 else 
 return CDialog :: OnCtlColor（pDC，pWnd，nCtlColor）; 
} 
  

当我用更改静态控件的文本时， GetDlgItem（IDC_STATIC_INFO） - > SetWindowText ，新文本与旧文本重叠（旧文本不被删除）。我尝试重新绘制背景，用 GetDlgItem（IDC_STATIC_BILD） - > Invalidate（）调用 SetWindowText 那么没有显示任何信息文本（既不是旧的也不是新的）。

你知道如何使静态控件变得透明，以便我也可以覆盖它一个新的文本？

感谢您的帮助！

解决方案：
来自Sanja的 codeproject-link 的方法2（改编）为我工作。

  GetDlgItem（IDC_STATIC_INFO） - > SetWindowText（tmp）; 
 CRect rect; 
 GetDlgItem（IDC_STATIC_INFO） - > GetWindowRect（& rect）; 
 ScreenToClient（& rect）; 
 InvalidateRect（& rect）; 
 UpdateWindow（）; 
  

解决方案

您可以找到透明静态样本 here

My application has a start dialog with an image which fills the whole dialog. Additionaly there is a CStatic control, which displays some variable information for the user. I made the CStatic control transparent with following code:

HBRUSH CStartbildDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
    if(pWnd->GetDlgCtrlID() == IDC_STATIC_INFO)
    {
        pDC->SetBkMode(TRANSPARENT);
        return reinterpret_cast<HBRUSH>(::GetStockObject(NULL_BRUSH));
    }
    else
        return CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
}

When I change the text of the static control with GetDlgItem(IDC_STATIC_INFO)->SetWindowText, the new text overlaps the old text (the old text is not deleted). I have tried to repaint the background befor calling SetWindowText image with GetDlgItem(IDC_STATIC_BILD)->Invalidate(), but then no info text is shown (neither the old nor the new).

Do you know how I can make the static control transparent, so that I also can override it with a new text?

Thanks for your help!

Solution: Method 2 (adapted) from the codeproject-link from Sanja worked for me.

GetDlgItem(IDC_STATIC_INFO)->SetWindowText(tmp);
CRect rect;
GetDlgItem(IDC_STATIC_INFO)->GetWindowRect(&rect);
ScreenToClient(&rect);
InvalidateRect(&rect);
UpdateWindow();

解决方案

Hi you can find transparent static sample here

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