Unable to set the background transparent after setting the Text Control controls content in the cont-CodePudding

Text Control controls by timer Settings, controls the content of the inside, every seconds but after I set the background transparent effect, Control can not be refreshed, set fixed color background can refresh content
Effect:

The Text Control display code

 bool CIDCardCountDown: : ShowMessage () 
{
Unsigned int delaySeconds=m_countDownSeconds - m_consumeSeconds; 


CRect rc; 
: : GetWindowRect (m_hWnd, rc); 
M_pParent - & gt; The InvalidateRect (rc); 
Cstrings strFormat; 
If (delaySeconds>=10) 
{
StrFormat. LoadString (IDS_IDCARD_COUNT_DOWN_MSG);//show message 
} 
The else 
{
StrFormat. LoadString (IDS_IDCARD_COUNT_DOWN_MSG_LESSTHAN10); 
} 

Cstrings strMsg; 
StrMsg. The Format (strFormat delaySeconds); 

: : SetWindowText (m_hWnd, strMsg); 
//: : InvalidateRect (m_hWnd, & amp; Rc, TRUE); 
If (delaySeconds==0) 
{
EndCountDown (); 
FireCountDownComplete (); 
Return false; 
} 

M_consumeSeconds + +; 

return true; 
}

The Text Control Control code

 HBRUSH CLoginDlg: : OnCtlColor (CDC * pDC, CWnd * pWnd, UINT nCtlColor) 
{


HBRUSH gets=__super: : OnCtlColor (pDC, pWnd, nCtlColor); 

Int nControlID=pWnd - & gt; GetDlgCtrlID (); 

The switch (nControlID) 
{


Case IDC_COUNT_DOWN_MSG: 
PDC - & gt; SetTextColor (RGB (100100100)); 
//pDC - & gt; SetBkColor (RGB (255255255)); 
PDC - & gt; SetBkMode (TRANSPARENT); 
PDC - & gt; SelectObject (& amp; M_countDownFont); 
Gets=(HBRUSH) GetStockObject (NULL_BRUSH); 

break; 

} 
Return gets; 
}

CodePudding user response:

OnEraseBkgnd?

CodePudding user response:

reference 1st floor zhao4zhong1 response:

OnEraseBkgnd?

Could you explain in detail the teacher, the Text controls need to be redrawn?

Ps: I don't have redrawn the Text control, transparent background is the control of

 pDC - & gt; SetBkMode (TRANSPARENT);

CodePudding user response:

Gets=(HBRUSH) GetStockObject ( NULL_BRUSH ).
Said don't erase the background, of course, the overlap (30 to 2 x)