OpenEuphoria

Re: [WIN] change bkgnd color of combo box

• Posted by Dan B Moyer <DANMOYER at PRODIGY.NET> Oct 25, 2000
• 415 views

Matt,

Well, I don't really have much idea what it is you're doing in your example,
but I'm game to try & understand it.  To get it to run I had to change some
things, not sure if that defeated any chance of it doing what I wanted or
not.

In "trackObject", I changed "getSelf()" to "Win" because it brought up an
error the original way, not sure what, it's over 300 lines :(  with Win32Lib
50.

Had to comment out "return brush" in the event trap(?), because brush not
declared; was that supposed to relate somehow to "myBrush" (didn't work when
I put that there), or get something from iMsg, or what??

And I added "WinMain".

Can you give me an idea what is supposed to be going on in your example?

Dan

P.S.:
Here's what it looks like after I made those changes:


-- begin code
include win32lib.ew

global constant
Win = create(Window,"Custom Combo", 0, 20, 20, 300, 300, 0),
CB  = create( Combo,"", Win, 20, 20, 90, 180, 0 )

addItem(CB, "One" )
addItem(CB, "Two" )
addItem(CB, "Etc..." )

constant myColor = #0, -- an rgb value here
myBrush = c_func( xCreateSolidBrush, { myColor } )
-- This might not be such a great idea.  You might
-- be better off creating and destroying the pen
-- each time you draw the list box, although
-- if this works, it's probably faster.

-- If you move this to within the event code,
-- you'll need to change ForProgram to ForPaint
trackObject(Win, CB, ForProgram )--CHANGED getSelf()TO Win BECAUSE ERROR'D

procedure CB_onEvent( integer iMsg, atom wParam, atom lParam )

    -- Win9x uses specific msgs now instead of WM_CTLCOLOR
    -- with a notification

    if iMsg = WM_CTLCOLORLISTBOX then
 --       return brush  -- HAD TO COMMMENT THIS OUT TO GET PROGRAM TO RUN
    end if

end procedure
-- you may have to change this to Win's event handler...
onEvent[CB] = routine_id("CB_onEvent")

WinMain( Win, Normal )--  ADDED THIS
-- end code



----- Original Message -----
From: "Matt Lewis" <matthewwalkerlewis at YAHOO.COM>
To: <EUPHORIA at LISTSERV.MUOHIO.EDU>
Sent: Tuesday, October 24, 2000 8:55 PM
Subject: Re: [WIN] change bkgnd color of combo box


> --- Dan B Moyer <DANMOYER at PRODIGY.NET> wrote:
>
> > but I don't know how to "trap" the WM_CTLCOLOR message.  Can you give me
a
> > small example?
>
> OK, this should get you started.  You need to create an onEvent procedure
for
> the parent of the combo (I think--the parent of the list box gets the
message,
> and I'm not certain if the combo or the combo's parent gets it).  Once
you've
> done that, you need to return the handle to a brush.
>
> So (untested):
>
> -- begin code
> include win32lib.ew
>
> constant
> Win = create(Window,"Custom Combo", 0, 20, 20, 300, 300, 0),
> CB  = create( Combo,"", Win, 20, 20, 90, 180, 0 )
>
> addItem(CB, "One" )
> addItem(CB, "Two" )
> addItem(CB, "Etc..." )
>
> constant myColor = #0, -- an rgb value here
> myBrush = c_func( xCreateSolidBrush, { myColor } )
> -- This might not be such a great idea.  You might
> -- be better off creating and destroying the pen
> -- each time you draw the list box, although
> -- if this works, it's probably faster.
>
> -- If you move this to within the event code,
> -- you'll need to change ForProgram to ForPaint
> trackObject( getSelf(), CB, ForProgram )
>
> procedure CB_onEvent( integer iMsg, atom wParam, atom lParam )
>
>     -- Win9x uses specific msgs now instead of WM_CTLCOLOR
>     -- with a notification
>
>     if iMsg = WM_CTLCOLORLISTBOX then
>         return brush
>     end if
>
> end procedure
> -- you may have to change this to Win's event handler...
> onEvent[CB] = routine_id("CB_onEvent")
>
>
> -- end code
>
> Other messages you might be interested in (which should work the same as
> WM_CTLCOLORLISTBOX):
> WM_CTLCOLOREDIT
> WM_CTLCOLORSCROLLBAR
> WM_CTLCOLORBTN
> WM_CTLCOLORSTATIC
>
> These should all be defined for you in winconst.ew (in the archives--by
Jaques
> D).  Now that I've looked at these, I think they should probably be
> incorporated into Win32Lib, to enable more flexible color schemes.
>
>
> =====
> Matt Lewis
> http://www.realftp.com/matthewlewis
>
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