Win32 CStatusBar pane flicker problem

Question

Hi
I update a CStatusBar pane inside a loop using SetPaneText() method and set update flag to TRUE but the text is flickers! also i called UpdateWindow() and RedrawWindow() after SetPaneText but problem so exist!

I also return TRUE on erase background but following happens:

Thanks

Answer 1

This is common problem with CStatusBar the trick is to SetBkMode(TRANSPARENT) a custom draw class example

void CStatusBarTreeEx::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
AFX_STATUSPANE* pPane = GetTreePane(lpDrawItemStruct->itemID);

if(pPane) 
{   
    // now draw the text if required
    if(!pPane->strText.IsEmpty())
    {
        CDC dc;
        CRect rect;
        int oldBkMode;
        COLORREF oldTextColor;

        UINT nFormat = DT_LEFT|DT_SINGLELINE|DT_EXPANDTABS|DT_NOPREFIX|DT_VCENTER;  
        rect = lpDrawItemStruct->rcItem;
        dc.Attach(lpDrawItemStruct->hDC);

        oldTextColor = dc.SetTextColor(theApp.m_clrThemeBtnText);
        oldBkMode    = dc.SetBkMode(TRANSPARENT); 

        dc.DrawText(pPane->strText, pPane->strText.GetLength(), rect, nFormat);

        dc.SetTextColor(oldTextColor);
        dc.SetBkMode(oldBkMode);
        dc.Detach();
    }
}

}

Answer 2

Did you try handling WM_ERASEBKGND and return TRUE from your statusbar class?