Re: Drawing a selection box using CRectTracker

From:

"Tom Serface" <tom.nospam@camaswood.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sat, 26 May 2007 06:07:55 -0700

Message-ID:

<CA4DC15E-A09F-44FF-8D12-BA5C9B8709C9@microsoft.com>

I've never used that one, but have you seen this sample code:

http://msdn2.microsoft.com/en-us/library/ms177537(VS.80).aspx

Tom

"Anders Eriksson" <andis59@gmail.com> wrote in message
news:u9p5exj3wnmc.dlg@ostling.com...

Hello,

I have an MFC SDI CView application and I want to draw an selection box
when the user left clicks and move the mouse. I have found the
CRectTracker
class but I can't get it to work

I have this code:

void CSCMLaserView2::OnLButtonDown(UINT nFlags, CPoint point)
{
SetCapture();
m_startPt = point;
m_theRectTracker.TrackRubberBand(this,point,TRUE);
}

void CSCMLaserView2::OnLButtonUp(UINT nFlags, CPoint point)
{
//Release the capture on the mouse
ReleaseCapture();
CSCMLaserDoc* pDoc = GetDocument();
ASSERT(pDoc != NULL);
CClientDC dc(this);
OnPrepareDC(&dc);

// Converts screen coordinates into logical ones
dc.DPtoLP(&point);
dc.DPtoLP(&m_startPt);
// Select object

pDoc->SelectObjectByWindow((double)m_startPt.x/m_dViewScale,(double)m_startPt.y/m_dViewScale,(double)point.x/m_dViewScale,(double)point.y/m_dViewScale);
Invalidate();
}

No box will be shown! If I remove the SetCapture/RelaseCapture I will get
a
box but then the OnLButtonUp() will never be called...

Please Help!

// Anders
--
English is not my first, or second, language
so anything strange, or insulting, is due to
the translation.
Please correct me so I may improve my English!