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How to eliminate flickering when using ShowWindow()

Posted on 2000-03-09
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Last Modified: 2013-11-20
Hi

  I need to show a series of dialog boxes.  I use ShowWindow() to hide a dialog box before showing the next one. However, i notice significant flickering and slow refreshing ( coz i can see glimpses of background applications) when i use this function .

Eg from Dialog Box 1 to Dialog Box 2

   ShowWindow(SW_HIDE);
   Dlg2.DoModal();
   ShowWindow(SW_SHOW);

   Any suggestions to the code or other methods to use??

  TIA
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Question by:kc76
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mahno earned 50 total points
ID: 2603865
U can increase speed by following way:

Add to class for Dlg2:

class CClassName : public CDialog {
  //add class member
  CDialog *m_pParentDlg;  
  //...
  //add metdod
  void SetParentDlg(CDialog *pParentDlg);
}

//...

//Add string to constructor
void CClassName::CClassName() {
  //...
  //Initialize m_pParentDlg
  m_pParentDlg = NULL;
}

void CClassName::SetParentDlg(CDialog *pParentDlg) {
  m_pParentDlg = pParentDlg;
}

void CClassName::OnShowWindow(BOOL bShow, UINT nStatus) {
      CDialog::OnShowWindow(bShow, nStatus);
      
  if ((bShow == TRUE) && (m_pParentDlg != NULL))
    m_pParentDlg ->ShowWindow(SW_HIDE);
}

//Add this for OnClose, OnOk, etc.
void CClassName::OnClose() {
  //...
  if (m_pParentDlg != NULL)
    m_pParentDlg ->ShowWindow(SW_SHOW);
}


Hope this helps,
  mahno
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