Re: How to differ mouse click and drag?

"vicky" <>
19 Mar 2007 21:47:42 -0700
On Mar 19, 8:39 pm, "AliR \(VC++ MVP\)" <A...@online.nospam> wrote:

Mouse is very sensetive. You have to keep the mouse completely still while
you click. So give it a little buffer to move before you start your

That is some intersting code. May I ask why your letting the message pump
take care of all of this?

void CMouseCaptureView::OnLButtonDown(nFlag,point)
        m_Point = point;


void CMouseCaptureView::OnMouseMove(nFlag,point)
    if (nFlag & MK_LBUTTON)
        //since mouse moves happen often lets give this thing a little
        if (point is past 2 or 3 pixels from m_Point)
            //this could go into LButtonDown
            m_Captured = TRUE;


void CMouseCaptureView::OnLButtonUp()
    if (m_Captured)
        m_Captured = FALSE;

"vicky" <> wrote in message

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

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

  CPoint pt;
  for (;;)

     MSG msg;

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


     case WM_MOUSEMOVE:
        RECT rc;
        bMove = TRUE;
        pt = msg.lParam ;
           if(hwnd != GetCapture()->GetSafeHwnd() )

     case WM_LBUTTONUP:

           bMove = FALSE;
           AfxMessageBox("Mouse L-Button UP, After Mouse Move.");
           AfxMessageBox("Mouse L-Button UP.");

     case WM_TIMER:

     }//End of switch

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

  }//End of For

  CView::OnLButtonDown(nFlags, point);

Hi Alir!

        Thanx for ur reply, it will really help me a lot.


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