Re: Drawing a selection box using CRectTracker

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!