Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 595
  • Last Modified:

Auto scroll in CFormView

I have some controls in CFormView, and when I tabbed to those which out of the visible area, I can't see the caret or the active control. How can I make auto scroll depending on the caret's position or the active control position. I would like a global method as posible i.e. avoiding treating each control.
0
slapak
Asked:
slapak
  • 3
1 Solution
 
piano_boxerCommented:
Add this WM_COMMAND hander to your CFormView class. It will up and down it the control receiving focus is not visible.

NOTE: and the variable m_nScrollPos to the class header and initialize it to zero in the constructor;

BOOL CXxxxView::OnCommand(WPARAM wParam, LPARAM lParam)
    {
        if( lParam && HIWORD(wParam)==EN_SETFOCUS )
        {
            MessageBeep(-1);

            CWnd* pControl = CWnd::FromHandle((HWND)lParam);
            ASSERT_VALID(pControl);

            CRect rcControl;
            pControl->GetWindowRect(&rcControl);
            ScreenToClient(&rcControl);

            int nScroll = 0;
            if(rcControl.top < 0)
                nScroll = -rcControl.top;
            else
            {
                CRect rc;
                GetClientRect(&rc);
                if(rcControl.bottom > rc.bottom)
                    nScroll = rc.bottom-rcControl.bottom;
            }

            if(nScroll)
            {
                m_nScrollPos = m_nScrollPos-nScroll;
                SCROLLINFO si;
                si.cbSize = sizeof(si);
                si.fMask = SIF_POS;
                si.nPos = m_nScrollPos;
                SetScrollInfo(SB_VERT, &si);
                ScrollWindowEx(0, nScroll, NULL, NULL, NULL, NULL, SW_SCROLLCHILDREN|SW_INVALIDATE|SW_ERASE);
            }
        }
0
 
piano_boxerCommented:
A little update to my prev answer:

As a formview is derived from CScrollView, a better way to scroll the view would be to call ScrollToPosition() and GetDeviceScrollPosition() to get the current scroll position instead of using SetScrollInfo() and ScrollWindowEx().
0
 
slapakAuthor Commented:
All right, but it works only if I don't have radio button or other CButton derivatives. What can I do in this case?
0
 
piano_boxerCommented:
To add support for other that edit controls, you need to look for aditional notification values in the WM_COMMAND handler.
NOTE: You need to enable the notify window flag for every control for this to work!

Button:     BN_SETFOCUS
Edit:       EN_SETFOCUS
ListBox:    LBN_SETFOCUS
ComboBox:   CBN_SETFOCUS

The new common controls send WM_NOTIFY messages to its parent, so
we need to handle them a little different.

Insert the decleration of the handler in the views class header:

    void OnSetFocusNotify( NMHDR * pNotifyStruct, LRESULT * result );

Insert this line above END_MESSAGE_MAP for the views class:

    ON_NOTIFY_RANGE(NM_SETFOCUS, 0, 0xffff, OnSetFocusNotify)


Insert the handler code in the views cpp-file:

void CXxxxView::OnSetFocusNotify( NMHDR * pNotifyStruct, LRESULT * result )
{
    CWnd* pControl = CWnd::FromHandle(pNotifyStruct->hwndFrom);
    ASSERT_VALID(pControl);

    CRect rcControl;
    pControl->GetWindowRect(&rcControl);
    ScreenToClient(&rcControl);

    [ insert code to scroll here ]
}
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

  • 3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now