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From: Andrew Elder on 15 Apr 2010 19:01
Hi All,

I am having a problem with a VB6 app not re-drawing the screen completely.
This is a form that
has not been changed (either form layout or code) for some time, but is now
not re-drawing some
controls...some command buttons in a frame are invisible. If I drag another
app (eg Notepad)
across this part of the form, the controls then re-appear. It appears that
Windows is just "forgetting"
to refresh this part of the screen!

If I include a:
Frame.Visible=False
Frame.Visible=true
in the code wherever any screen updates occur (I have several user-drawn
graphs of data) then these
controls will be visible, but this solution causes an annoying flash.

I have searched the 'net but cannot find ant hints...

Thanks in advance...

Andrew Elder


From: David on 15 Apr 2010 22:23
Andrew:

You didn't say whether you use AutoRedraw = True or whether
you Paint everything yourself (AutoRedraw = False).

My first guess is:
1) AutoRedraw on the form or some control got changed somewhere along the
line.
2) Some code got changed or reordered.
3_ Review were you do your "Refresh".
4) If you use DoEvent quite a bit then this can cause issues.
5) If you don't use DoEvents at all then look at some key placement.

Windows does its own thing when Painting, so tough to troubleshoot.

About all I can offer without more info.

David




"Andrew Elder" <aelder(a)melbpc.org.au> wrote in message
news:ej%239D%23O3KHA.4332(a)TK2MSFTNGP02.phx.gbl...
> Hi All,
>
> I am having a problem with a VB6 app not re-drawing the screen completely.
> This is a form that
> has not been changed (either form layout or code) for some time, but is
> now not re-drawing some
> controls...some command buttons in a frame are invisible. If I drag
> another app (eg Notepad)
> across this part of the form, the controls then re-appear. It appears that
> Windows is just "forgetting"
> to refresh this part of the screen!
>
> If I include a:
> Frame.Visible=False
> Frame.Visible=true
> in the code wherever any screen updates occur (I have several user-drawn
> graphs of data) then these
> controls will be visible, but this solution causes an annoying flash.
>
> I have searched the 'net but cannot find ant hints...
>
> Thanks in advance...
>
> Andrew Elder
>
>


From: Mike Williams on 16 Apr 2010 02:09
"Andrew Elder" <aelder(a)melbpc.org.au> wrote in message
news:ej%239D%23O3KHA.4332(a)TK2MSFTNGP02.phx.gbl...

> I am having a problem with a VB6 app not re-drawing the
> screen completely. This is a form that has not been changed
> for some time, but is now not re-drawing some controls...
> some command buttons in a frame are invisible. If I drag
> another app (eg Notepad) across this part of the form, the
> controls then re-appear. It appears that Windows is just
> "forgetting" to refresh this part of the screen! (I have
> several user-drawn graphs of data) . .

Is your code perhaps inadvertently drawing over the controls? I'm assuming
that the actual graphs you are drawing are not temporarily covering them or
you would surely notice, but it is possible under certain circumstances that
something as simple as a Me.Cls is doing it. This would likely happen if,
for example, you have accidentally set the ClipControls property of your
Form, or perhaps of the Frame, to False. Have you checked that ClipControls
is True in both cases?

Mike


From: Jeff Johnson on 16 Apr 2010 13:38
"Andrew Elder" <aelder(a)melbpc.org.au> wrote in message
news:ej%239D%23O3KHA.4332(a)TK2MSFTNGP02.phx.gbl...

> I am having a problem with a VB6 app not re-drawing the screen completely.
> This is a form that
> has not been changed (either form layout or code) for some time, but is
> now not re-drawing some
> controls...some command buttons in a frame are invisible. If I drag
> another app (eg Notepad)
> across this part of the form, the controls then re-appear. It appears that
> Windows is just "forgetting"
> to refresh this part of the screen!
>
> If I include a:
> Frame.Visible=False
> Frame.Visible=true
> in the code wherever any screen updates occur (I have several user-drawn
> graphs of data) then these
> controls will be visible, but this solution causes an annoying flash.
>
> I have searched the 'net but cannot find ant hints...

Welcome to VB. This problem just seems to occur randomly. I have one program
where it happens all the time in a certain group of list views. I don't know
what to tell you. Have you tried calling Refresh on the controls themselves?


From: Andrew Elder on 16 Apr 2010 20:45
Hi All,

Thanks for everyone's input.

There where two refreshing problems on this particular form.
1. A standard Frame with several standard Command Buttons. The Command
Buttons sometimes
disappeared, or where partly drawn if forced to by dragging another app over
them.

2. A Picturebox with graphic methods only partly drawing, leaving
rectangles of light grey backgrounds.

I cured the first problem by setting the Clipcontrols for the Frame to
False. I still do not fully understand
what this does, despite reading the help several time, but it seems to have
fixed this one!

The second problem "just got better"! I was tesing various combinations of
Clipcontrols and Autoredraw,
and it all started to work properly again. All settings are now back to when
I wrote some of this code years ago.

As Jeff suggested, it seems to be random. I have seen similar occurences
over the years, and sometimes it
can be cured by removeing the form from the project, attempting to compile
(Run) the project, then adding
the form back after the complier complains. I am guessing it's to do with
the order in which the modules,
forms etc are loaded into the project and compiled.

Anyhow, it seems to work now, so I am happy. But, I don't fully understand
what I did to fix it, so I am not happy!

Thanks again...keep this forum alive forever...

Andrew


"Jeff Johnson" <i.get(a)enough.spam> wrote in message
news:%23wYetuY3KHA.556(a)TK2MSFTNGP04.phx.gbl...
> "Andrew Elder" <aelder(a)melbpc.org.au> wrote in message
> news:ej%239D%23O3KHA.4332(a)TK2MSFTNGP02.phx.gbl...
>
>> I am having a problem with a VB6 app not re-drawing the screen
>> completely. This is a form that
>> has not been changed (either form layout or code) for some time, but is
>> now not re-drawing some
>> controls...some command buttons in a frame are invisible. If I drag
>> another app (eg Notepad)
>> across this part of the form, the controls then re-appear. It appears
>> that Windows is just "forgetting"
>> to refresh this part of the screen!
>>
>> If I include a:
>> Frame.Visible=False
>> Frame.Visible=true
>> in the code wherever any screen updates occur (I have several user-drawn
>> graphs of data) then these
>> controls will be visible, but this solution causes an annoying flash.
>>
>> I have searched the 'net but cannot find ant hints...
>
> Welcome to VB. This problem just seems to occur randomly. I have one
> program where it happens all the time in a certain group of list views. I
> don't know what to tell you. Have you tried calling Refresh on the
> controls themselves?
>
>


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