MFC, c++ When showing and hiding ctrls on the screen can I disable paint for a bit

Question

I have a screen with say 20 controls on it. I want to show all twenty, then hide only the ones that don't relate to what I'm working on.

psudoCode.
for each element 
    show element 

for each element in hide list
    hide element.

My problem is that between the loops the screen paints. It looks very ugly.
I know I've seen this done but for the life of me I can't find that code, or even remember what app I'd seen that code in..

Does anyone know how to suspend the paint for a bit?

What function are you calling to hide the ctrl/window? – Aaron Fischer Nov 17 '08 at 21:47 — Aaron Fischer, Nov 17 '08 at 21:47

score 2 · Answer 1 · answered Nov 17 '08 at 21:46

2

As someone suggested to me not long ago, use CWnd::SetRedraw

wnd.SetRedraw(FALSE)
... // do your stuff with elements
wnd.SetRedraw(TRUE)

answered Nov 17 '08 at 21:46

Peter

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That would have to be called for each control being shown / hidden. – Shog9 Nov 17 '08 at 21:52
Are you sure that has to be called for each control? – baash05 Nov 17 '08 at 21:53
If you hide the window it should not take part in the paint process unless something else is invalidating the window or sending it WM_Paint messages. – Aaron Fischer Nov 17 '08 at 22:00
I take that back - it appears that, when called on the dialog, SetRedraw(FALSE) will prevent all drawing of children until SetRedraw(TRUE) is called. – Shog9 Nov 17 '08 at 22:13
Yes. that is common. In wx this is called freeze/thaw, and it's recursive for children too – Johannes Schaub - litb Nov 17 '08 at 22:30

MFC, c++ When showing and hiding ctrls on the screen can I disable paint for a bit

1 Answers1