Change color of label

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Hi.

In my MFC application, i need to change the label color. The color will depend on the text to be displayed in the label.
Eg:- for Warning, a red text "Warning" need to be shown as label.
For Success, a green text "Success" need to be shown.

Please anybody help me?

Posted 19-Jul-10 22:31pm

reshmi2000

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3 solutions

Solution 1

1) You need specify ID different than IDC_STATIC for the label in question.
Here we used IDC_COLORED_LABEL in the sample code.

2a) MFC project

Add WM_CTLCOLOR handler for the dialog and modify it as follows:

HBRUSH CDialogDlg::OnCtlColor(CDC* pDC, CWnd* pWnd,
UINT nCtlColor)
{
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

// Add the following code
if (pWnd->GetDlgCtrlID() == IDC_COLORED_LABEL)
pDC->SetTextColor(RGB(128, 0, 0)); // dark red
// End

return hbr;
}

Note that MFC uses OnCtlColor method to handle all types of WM_CTLCOLORXXX
messages.

2b) Windows API

End the body of WM_CTLCOLORSTATIC dialog message handler with

return (BOOL) GetSysColorBrush(COLOR_3DFACE);

It is important that a valid brush handle, not TRUE or FALSE is returned.

HTH

Posted 19-Jul-10 22:43pm

Peace ON

Solution 2

will the OnCtlColor() get called , each time i need to change the label text?
How will i specify the required colour when i add text to the label?

in my code,
m_lStatusMessage.SetWindowText("Success");
m_lStatusMessage.SetFont(&m_Font); // i am increasing the font too.. this is working.
Here, how will i give RGB information?Or how can i call OnCtlColor()? can i directly call after the above two steps for changing the label color?

Posted 19-Jul-10 22:52pm

reshmi2000

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Sauro Viti 20-Jul-10 5:07am

Please, don't post a comment as an answer; use the "Add comment" link below the answer instead

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Sauro Viti · Accepted Answer · 2010-07-19T23:14:00

The WM_CTLCOLOR message is sent each time a control should be repainted, so you can add a COLORREF member to your dialog class and modify your code in a way similar to the snippet below:

In your class declaration:

C++

class CMyClass: public CDialog
{
   ...
protected:
   COLORREF m_rgbLabel;
   ...
};

In your class implementation:

C++

HBRUSH CDialogDlg::OnCtlColor(CDC* pDC, CWnd* pWnd,UINT nCtlColor)
{
   HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

   // Add the following code
   if (pWnd->GetDlgCtrlID() == IDC_COLORED_LABEL)
      pDC->SetTextColor(m_rgbLabel);

   return hbr;
}

...

   // Change the label color before changing its text!
   m_rgbLabel = RGB(0x00F, 0xFF, 0x00); // Light green
   m_lStatusMessage.SetWindowText("Success");
   m_lStatusMessage.SetFont(&m_Font);
 
...