Re: How to differ mouse click and drag?

From:

"Mubashir Khan" <mubi@yahoo.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 19 Mar 2007 07:41:40 -0500

Message-ID:

<OEJgFQiaHHA.4940@TK2MSFTNGP05.phx.gbl>

It is very unlikely that mouse up is sent without mouse move .... specially
if a user is performing this activity .... the cursor may misplace every
time down and up (simply click) is performed and this generates mouse move
events ..... i suggest u one thing ... take care of this programmatically
....... and if u are going to provide both click and drag functionality for
some window ... consider using dblclick instead of click ... this will even
make users life a bit easier ......

"vicky" <ziashahid123@gmail.com> wrote in message
news:1174287755.596353.110580@o5g2000hsb.googlegroups.com...

Hi All!

I am having a problem regarding mouse capture. I am capturing mouse
events in my LBUTTONDOWN Handler but i am unable to differ between
click (Mouse down and UP) and drag(Mouse down -> move -> up).
When i am expecting single click windows fires mouse move too. at
first time it runs fine but for subsequent clicks it gives me msg
"Mouse L-Button UP, After Mouse Move.".

What to do now?

Following is my code in which i am capturing mouse events on
LBUTTONDOWN handler.

void CMouseCaptureView::OnLButtonDown(UINT nFlags, CPoint point)
{

  CPoint pt;
  for (;;)
  {

     MSG msg;
     ::GetMessage(&msg,NULL,0,0);

     CWnd *pwnd = AfxGetApp()->GetMainWnd();
     HWND hwnd = pwnd->GetSafeHwnd();

     switch(msg.message)
     {

     case WM_MOUSEMOVE:
        RECT rc;
        bMove = TRUE;
        pt = msg.lParam ;
        GetWindowRect(&rc);
        if(PtInRect(&rc,pt))
        {
           SetTimer(TID_POLLMOUSE,MOUSE_POLL_DELAY,NULL);
           if(hwnd != GetCapture()->GetSafeHwnd() )
           {
              SetCapture();
           }
           break;
        }
        break;

     case WM_LBUTTONUP:

        if(bMove)
        {
           bMove = FALSE;
           AfxMessageBox("Mouse L-Button UP, After Mouse Move.");
        }
        else
           AfxMessageBox("Mouse L-Button UP.");
        ReleaseCapture();
        KillTimer(TID_POLLMOUSE);
        PostMessage(WM_MOUSELEAVE,0,0L);
        break;

     case WM_TIMER:
        GetWindowRect(&rc);
        GetCursorPos(&pt);
        if(PtInRect(&rc,pt))
        {
        PostMessage(WM_MOUSEHOVER,0,0L);
        break;
        }
        ReleaseCapture();
        KillTimer(TID_POLLMOUSE);
        PostMessage(WM_MOUSELEAVE,0,0L);
        break;

     default:
        DispatchMessage(&msg);
     }//End of switch

     // release the mouse (if we still own it)
     if (GetCapture() == this) ::ReleaseCapture();

  }//End of For

  CView::OnLButtonDown(nFlags, point);
}