mfc, how to make a view (without a title bar) draggable?

microsoft.public.vc.mfc - Microsoft Visual C


mfc >> how to make a view (without a title bar) draggable?

by May Young » Thu, 04 Dec 2003 04:13:24 GMT

Hi,

I want to create a listbox (using CWnd::CreateEx()) as a child view of
the main view. But the lustbox must not have a menu bar and a title
bar. How can I make this listbox child view draggable (but not
resizable)? Please help. Thanks.

Tony


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mfc >> how to make a view (without a title bar) draggable?

by CheckAbdoul » Thu, 04 Dec 2003 05:01:44 GMT


Handle OnMouseMove() at the Listbox level and send a WM_NCLBUTTONDOWN
message with wParam = HTCAPTION to the listbox itself. Something like

void CYourListBox::OnMouseMove(UINT nFlags, CPoint point)
{
SendMessage( WM_NCLBUTTONDOWN, HTCAPTION, 0 );
// CListBox::OnMouseMove(nFlags, point);
}

--
Cheers
Check Abdoul [VC++ MVP]
-----------------------------------







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mfc >> how to make a view (without a title bar) draggable?

by May Young » Thu, 04 Dec 2003 07:42:18 GMT

Hi CheckAbdoul,

Thanks for the guide. It works but has two problems:

1) If I click on an item in the listbox and drag, the listbox
won't move. It moves only if I click on an empty space and
then drag.

2) If I click on a location outside the listbox and then drag, the
listbox moves after the cursor enters the listbox. The listbox
shouldn't move unless the left mouse down location is inside
its area.

Could you kindly give me future instuction? Thanks.

Tony






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how to make a view (without a title bar) draggable?

by May Young » Thu, 04 Dec 2003 08:34:41 GMT

Never mind. Thanks. I got the solution:

UINT CYourListBox::OnNcHitTest(CPoint point)
{
UINT nHitTest = CListBox::OnNcHitTest(point);
if ((nHitTest == HTCLIENT) &&
(::GetAsyncKeyState(MK_LBUTTON) < 0))
nHitTest = HTCAPTION;
return nHitTest;
}







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