Re: Focus issue

David Wilkinson <>
Fri, 12 May 2006 11:33:08 -0400
Ed wrote:

I found that if I add the line drawbars1(); to the OnPaint() routine it
works also.
When I overlap the bargraph with another window the bring focus to bargraph
window it does repaint.
Is this a valid way around ?

"David Wilkinson" <> wrote in message

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, (cr.Height()/2)+(cr.Height()/4)+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


Some people frown on painting in the dialog itself. Also, if I
understand correctly, you are not using the CPaintDC, which is not the
"correct" way. Normally, if you know you need repainting, you should
just call Invalidate() or InvalidateRect() and put all your painting
code in OnPaint().

With a little effort, you could make yourself a flexible bar graph class
that you could use in other dialogs/projects.

One more detail: you seem to be using some fixed pixel sizes in your
painting. This may work for you on your machine, but the pixel
dimensions of a dialog (and your picture rectangle) are machine-dependent.

David Wilkinson

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