Re: Focus issue

David Wilkinson <>
Fri, 12 May 2006 10:01:20 -0400
Ed wrote:

How do I do that?

"David Wilkinson" <> wrote in message

Ed wrote:

I use the routine below to draw a bargraph in a IDC_PIC window when a
button is clicked.
This routine workse fine but when the user opens another window that
overlaps this one
and then returns focus to this window the part of the bargraph that was
covered is blank.
Please show me how to fix this so when focus is returned to my app it is

bool CEcolorDlg::drawbars1()
 CRect cr;
 CBrush yel(RGB(255,255,213));
 CBrush blu(RGB(114,120,141));
 CBrush blk(RGB(0,0,0));
 int c=15, b=5, d, e=0, a;
 CWnd* pWnd=GetDlgItem(IDC_PIC);


 d = (cr.Width()-20)/numkeys;
 //draw background
 pControlDC->Rectangle(0,0,cr.Width(), cr.Height());
 //draw 50% grid line
 pControlDC->Rectangle(1, (cr.Height()/4), cr.Width()-1,
 pControlDC->Rectangle(1, (cr.Height()/2), cr.Width()-1,
 pControlDC->Rectangle(1, (cr.Height()/2)+(cr.Height()/4), cr.Width()-1,

 for (b=0; b<numkeys; b++)
   a = ((bar[b] * 10) / 10)+1;
   pControlDC->Rectangle (c, cr.Height(), c+3, cr.Height()-a);
 return true;

Thanks in advance


Make a derived picture control class and put the bargraph drawing code in
its OnPaint() handler.

David Wilkinson


Just derive a class, say CBarGraph, from CStatic and handle WM_PAINT
message. Then associate your IDC_PIC control with a member variable of
type CBarGraph.

David Wilkinson

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