Announcement

**Fred Harris** · 9 Jan 2008, 07:50 AM

make scroll bars go away

Fred,

Basically, to make scrollbars go away, this is what I do...

Code:

'please pardon my C code - quickest to come up with...
pMainWindowData->ed.si.fMask=SIF_ALL;
pMainWindowData->ed.si.nMin=0;
pMainWindowData->ed.si.nMax=0;
pMainWindowData->ed.si.nPos=0;
SetScrollInfo(pMainWindowData->hGrid, SB_VERT, &pMWD->ed.si, TRUE);

If the nMin=nMax=0, I believe that's sufficient?

Fred

**Fred Buffington** · 9 Jan 2008, 08:22 AM

Thanks Fred. knew it was something i was overlooking. I'll try it right now.

I added that si.nmin= 0 , and si.nmax=0, and si.npos=0 and setscrollinfo and it didnt help
see code below
'new code added per Fred Harris

**Fred Harris** · 9 Jan 2008, 08:31 AM

I saw you were using the SCROLLINFO type as I do Fred. I also noticed some of your variables that you were loading into si.nMin & si.nMax. Perhaps some of your variables are holding values other than zero when you are calling SetScrollInfo(). If that's the case, that would probably cause the scroll bar to not disappear.

**Fred Buffington** · 9 Jan 2008, 08:58 AM

hmm well i finished setting all the scrollinfo stuff
si.nMin = 0
si.nMax = 0
si.nPage = 0
si.fMask = 0
si.nPos = 0
si.cbsize = 0
si.ntrackpos=0
still no success.
Frustrated..LOL

**Fred Harris** · 9 Jan 2008, 09:13 AM

Fred,

I believe you created a Scroll Bar Control, didn't you (I don't follow DDT code real good

)? If that's the case, you need to place the handle of the scroll bar as the first parameter in the SetScrollInfo(hScrollBar,...), not CBHNDL, which is the parent of the scroll bar.

If the verticle scroll bar was placed on the parent as one of the Window Styles, i.e., WS_VSCROLL, then CBHNDL with %SB_VERT would work.

Fred

**Fred Buffington** · 9 Jan 2008, 09:31 AM

yea, figured that out. thought i had posted this answer but now dont see it
Partial success. I did do that. I already had an %idc_scrollbar1 defined so used
that in place of the %sb_vert. and was sure all values were zero and success.

But now it wont position the thingy at the bottom when i click on it.
See it should only have 2 positions - top and at bottom since in zoom mode
it shows the top half or the bottom half.

Now clicking the scrollbar does make it toggle between showing the top or bottom of the report (graphic) (as it always did) but the thingy stays at the top of the scrollbar while before it went to the bottom then back up to the top on alternate clicks.

I'll repost the modifed callback in place of the original one.

**Fred Harris** · 9 Jan 2008, 09:55 AM

If the scroll bar only has two positions, then nMin=0 and nMax=1 should take care of that calibration. Of course, when code executes to move your data, you need to call SetScrollInfo() and 'set'' the nPos to 0 or 1 as the case may be.

**Fred Buffington** · 10 Jan 2008, 12:17 PM

It is now working great.

**It pays to read the help.**

With a control add scrollbar, when using setscrollinfo you should use
%SB_CTL rather than %SB_VERT or %SB_HORIZ as the flag.

This one change solved the display of the scrollbar to the top/bottom.

Had previously fixed the scrollbar not disappearing (as previously noted) with Fred Harris' help.

Thanks Fred.

**Fred Harris** · 10 Jan 2008, 12:59 PM

Geez, I forgot to mention that too, but you figured it out Fred! One other thing, I believe the visibility of a scroll bar control can also be set with the ShowWindow() api call where you place the hWnd of scroll bar as first parameter, and use the various equates such as %SW_SHOW, %SW_HIDE, etc. However, if this setting gets screwed up anyway in your code you can end up with a situation where the durn thing should be one way but its the other! I think modifying the .nMin and .nMax TYPE members of SCROLLINFO is the way to go.

**Fred Buffington** · 10 Jan 2008, 01:21 PM

The only thing now is a minor annoyance.

again here is the senario.
In full page view no scrollbar should be visible . done!
In zoom mode, when first goes into it, scrollbar visible. done!
since there are only top and bottom to show, the 'bar' is 1/2 the way down
(from the top to the middle). done! sortof

when bar clicked, toggles to bottom or top depending on what is showing.
this works fine. bar shows 1/2 of scrollbar. OK.

here is the sortof.

if I go back to the full page, the scrollbar disappears (as it should).
If i then go back into 'zoom', the 'bar' is small instead of extending half the way down as it does the first time.

Now if i click on the scroll bar to go down the page, it returns to the showing
the bar half way as it is supposed to do and works fine.

so, it's only going into zoom mode the second time on that initially the bar (not the entire scrollbar area but just the bar part) is small instead of half way. Once clicked it returns to the half way and displays correctly.

Strange.

I guess to be more clear the 'bar' should be referred to as the 'slider?'

**Fred Harris** · 10 Jan 2008, 02:50 PM

I've never fooled around with the size of the scroll bar 'thumb' (I believe that's the correct term). The documentation seems to be saying that's determined by the nPage member of SCROLLINFO. Check out SetScrollInfo() for what little info is given on that. I guess I'm easy to satisfy and have always been happy with what Windows gave me. It sounds like something is going on there for you though.

**Fred Buffington** · 10 Jan 2008, 03:17 PM

I have that part correct im sure. I set si.npage to 135 while si.nmax is 270
si.npos is either 0 or 270. The only place it is different is when i 'eliminate'
the scrollbar with the setscrollinfo with all zeros. I even tried leaving the page
value at 135 there too but didnt help.

I will try just control delete without the setscrollinfo with all zeros but i dont think that will work.

Well i'll be, that did it.
I removed (remmed) the si.nwhatever = 0 lines
and remmed the setscrollinfo in the place where it eliminates the scrollbar
replaced with control kill hDlgPreview, %IDC_SCROLLBAR1 and wahlah.

Thank you again Fred for spending so much time on my little program. Hope i can
repay it in the future.

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Scrollbar won't disappear

Scrollbar won't disappear

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