Re: CFormView and scrolling

"AliR \(VC++ MVP\)" <AliR@online.nospam>
Fri, 20 Jul 2007 15:54:26 GMT
If you ask me this is going to be a never ending battle between the controls
and the scrollbar.

But here are some pointers.
You can obviously get the scroll position which will give you the visible
area of the FormView.
You can call GetNextDlgTabItem to get the next or previous item in the tab
order. And you can get its rectangle
Now you can compare the two rectangles to see if the next item in the tab
order is visible or not.

Why don't you catch the WM_KEYDOWN message in the PreTranslateMessage
anyway, and do your processing there instead of OnKeyDown.

Hope this helps.

"mosfet" <> wrote in message

AliR (VC++ MVP) a ?crit :

What is it that you are trying to do? That's not very clear in your


"mosfet" <> wrote in message


I am developping on pocket pc an application with some views deriving
from CFormView.
On this platform you cannot resize your MainFrame because it's always
So let's say I have a CAboutView and inside it I am putting some
controls outside the client rect, for now here is what I am doing to
have the scrollbar appeared :

void CAboutView::OnWindowPosChanged( WINDOWPOS* lpwndpos )
if ( rcItem.bottom > rc.bottom ) {
// Scroll bar info
SetScrolling( TRUE );
SetScrollPos( SB_VERT, 0 );
SetScrollSizes( MM_TEXT, CSize( rc.Width(), rcItem.bottom + 2) );

else {
// Scroll bar info
SetScrollSizes( MM_TEXT, rc.Size() );

So basically I am taking the last controls and I resize my scrollbars.

But I am not very satisfied by this solution, do you have a better idea

Ok What I want to do is to be able to scroll a view deriving from a
CFormView on a smartphone knowing that on this platform you cannot move
scollbars "by hand". For that you have to use keypad.
The problem is usually a WM_KEYDOWN is eaten in the PreTranslateMessage.

So when I have a CFormView with some controls(listboxes for instance) on
it, a WM_KEYDOWN is receive in the PreTranslate and after the
shell/OS/framework(I don't know who exactly) move the focus from one
control to another.

Now consider the case :

We have a view with one vertical scrollbar and one static control to
display some text and a CStaticlink(CButton) to open a URL when clicking
on it.

If I want to be able to move my scrollbar I do the following

UINT CBaseView::OnGetDlgCode()
if (m_nScrollPolicy == 0)
return ( CFormView::OnGetDlgCode() );

I receive the WM_GETDLGCODE and I say that my view wants to receive
When I receive the WM_KEYDOWN I call OnVScroll to move my view BUT the
problem is if I do that my CStaticlink cannot get focus and I cannot
click on it.

void CBaseView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
switch (nChar)
case VK_UP:
nVPos = ((nVPos - 15) < 0) ? 0 : nVPos - 15;
case VK_DOWN:
case VK_LEFT:
nHPos = ((nHPos - 15) < 0) ? 0 : nHPos - 15;
case VK_RIGHT:
nHPos += 15;

So to fix it I would need inside the OnKeyDown to check if the next tab
control is on screen and in this case instead of calling OnVScroll maybe I
should set focus to my CStaticlink.
And what if a ClistView get the focus, normally each call to WM_KEYDOWN
should move the item and not the focus.

ANOTHER problem is that this first case relies on the fact that I receive
the WM_GETDLGCODE and it's not always the case. it works ONLY if my view
doesn't have a focus on a control.

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