MFC's CTabCtrl::HitTest function returns “1” for any tab clicked

Question

Hi (although greeting usually gets deleted),

I'm using the MFC's CTabCtrl control and try to determine which tab was clicked (to drag & drop it later). Should be quite easy I thought - anyway got stuck with the HitTest function which returns "1" for whichever tab is clicked.

As I started the project very recently, it's literaly just a handful of lines. The mentioned HitTest function is used in Tdi.cpp file in CHlavniOkno::CTdi::OnLButtonDown function (full source code at http://nestorovic.hyperlink.cz/cpp_mfc.zip ):

afx_msg void CHlavniOkno::CTdi::OnLButtonDown(UINT flagy,CPoint bod){
    if (::DragDetect(m_hWnd,bod)){
        TCHITTESTINFO hti={bod};
        if (int idZalozky=HitTest(&hti)>=0)
            parametryTazeneZalozky=new TParametryTazeneZalozky(this,idZalozky);
    }
    CTabCtrl::OnLButtonDown(flagy,bod);
}

I definitely must have omitted something tiny, as is almost always the case...

Thanks for your time by having a look at the problem.

Tomas

Answer 1

The statement int idZalozky=HitTest(&hti)>=0 is setting idZalozky to the result of the test HitTest(&hti)>=0 . As a boolean test this will always return either 0 or 1.

You probably want:

int idZalozky=HitTest(&hti);
if (idZalozky>=0)
{
...
}