OpenEuphoria

Re: Win32Libv50: How make window invisible (initially?)?

• Posted by Dan B Moyer <DANMOYER at PRODIGY.NET> Sep 27, 2000
• 517 views

Matt,

Thanks; *very* interesting!  Brought quite a few questions to mind :)

However, I pretty much solved my problem by taking Wolf's advice and first
finding screen center, & then centering the modal window when I *create* it;
too too obvious!  The thought had dimly occurred to me, but I hadn't
implemented it till after Wolf suggested it.

But it had never occurred to me to center a window (by moving it) *before*
even opening it, as Wolf also suggested and you utilized in your code sample
below.  I think that by itself should be sufficient to keep any "initial"
display from *flickering* over to a new centered position, as was happening
when I opened a window first and then centered it.

And it turns out I already had downloaded winconst.ew sometime previously,
but I couldn't make sense of it then, nor now.

I can guess that HWND might mean "handle of the window", but can't guess
offhand what difference there might be between "top" and "topmost";
similarly, I can guess that SWP_xxx in some way refers to the function
"SetWindowPosition", but that's only because you *used* some of the
constants that start with "SWP" in "SetWindowPosition", which makes it jump
out at me.  But how would one know what all those *other* constants in
winconst.ew *refer* to, or where they are used, anyway?

And where does "SetWindowPosition" *come from*? I can vaguely understand
that you are calling some c-function somewhere, but where?  And probably
most important, how do you know what goes where when you do "c_func(..."?

If winconst.ew contained some comments that helped answer those questions,
then I (and/or others) could at least make a little sense of it.  Like if
those constants are intended to be used in specific functions relating to
the first letters in the constants name, then a comment at the start of a
group of them telling what function they are to be used in would be helpful.
Plus of course a listing of what parameters go where *in* the function.

Oh, and when you do "SWP_HIDEWINDOW + SWP_NOACTIVATE" in "xSetWindowPos", is
that functionally equivalent to the "or_all" used to combine flags in
Win32Lib?

Dan
inquiring minds want to know, unless of course they have to RTFM :)

P.S.  these were just questions that occurred to me in reading your post; no
real urgency in answering them :)

----- Original Message -----
From: "Matthew Lewis" <MatthewL at KAPCOUSA.COM>
To: <EUPHORIA at LISTSERV.MUOHIO.EDU>
Sent: Tuesday, September 26, 2000 11:07 AM
Subject: Re: Win32Libv50: How make window invisible (initially?)? + Win32Lib
dev request


> > From: Dan B Moyer
> >
> >
> > Maybe there is some set of "styles" which when or'd will give the
> > fundamental properties of a modal window, but *not* include
> > "WS_VISIBLE"
> > that would work with "openWindow"?
> >
>
> You might try using SetWindowPos:
>
> -- Tested code
> -- You can find these constants and many more in winconst.ew in the
> archives:
> constant
> HWND_BOTTOM  = 1,
> HWND_NOTOPMOST = (-2),
> HWND_TOP = 0,
> HWND_TOPMOST = (-1),
>
> SWP_DRAWFRAME = 32,
> SWP_FRAMECHANGED = 32,
> SWP_HIDEWINDOW = 128,
> SWP_NOACTIVATE = 16,
> SWP_NOCOPYBITS = 256,
> SWP_NOMOVE = 2,
> SWP_NOSIZE = 1,
> SWP_NOREDRAW = 8,
> SWP_NOZORDER = 4,
> SWP_SHOWWINDOW = 64,
> SWP_NOOWNERZORDER = 512,
> SWP_NOREPOSITION = 512,
> SWP_NOSENDCHANGING = 1024
>
> -- replace your call to moveWindow with this:
> integer ok
> ok = c_func( xSetWindowPos, { getHandle( aModalWindow ), HWND_TOP, posx,
> posy, xsize, ysize, SWP_HIDEWINDOW + SWP_NOACTIVATE)
>
> Then, you can change  OnClick_Tut1Button() to:
>
> procedure OnClick_Tut1Button()
>   center_win(aModalWindow)  -- center it
>   openWindow( aModalWindow, Modal )
> end procedure
>
>
> -- End Code
>
> Now you're flicker free.
>
> Matt