Re: Mouse movement within CStatic/Picture box

From:
"AliR \(VC++ MVP\)" <AliR@online.nospam>
Newsgroups:
microsoft.public.vc.mfc
Date:
Tue, 12 Jun 2007 09:50:25 -0500
Message-ID:
<3sybi.18479$C96.6812@newssvr23.news.prodigy.net>
Drawing a rectangle with the user draging the mouse in any window would be
like this: (make sure the static control has the notify flag set to true)

void CDrawingStatic::OnLButtonDown(UINT nFlags, CPoint point)
{
    //capture mouse
   SetCapture();

    //set the flag so that MouseMove will adjust the end of the rectangle
   m_Capture = TRUE;
   m_Rect.SetRect(point.x,point.y,point.x+10,point.y+10);

   CStatic::OnLButtonDown(nFlags, point);
}

void CDrawingStatic::OnLButtonUp(UINT nFlags, CPoint point)
{
    //release mouse capture
   ReleaseCapture();

   m_Capture = FALSE;

   m_Rect.right = point.x;
   m_Rect.bottom = point.y;

   Invalidate();
   CStatic::OnLButtonUp(nFlags, point);
}

void CDrawingStatic:OnMouseMove(UINT nFlags, CPoint point)
{
   if (m_Capture)
   {
      m_Rect.right = point.x;
      m_Rect.bottom = point.y;

      Invalidate();
   }

   CStatic::OnMouseMove(nFlags, point);
}

AliR.

"MD" <madhu.datla@gmail.com> wrote in message
news:1181610949.461689.237730@r19g2000prf.googlegroups.com...

Hello,

I have a picture box, in which I need to draw a rectangle when user
makes a selection by dragging the mouse.

I am able to capture the mouse click event in the picture box(by
deriving from CStatic and handled the
ON_STN_CLICKED event from main Form).

But I am unable to understand how to capture mouse drag/ draw a
rectangle over picture box when the mouse moves. (New to MFC
programming, Pls help, any tips on how to handle OnLButtonUp,
OnMouseMove events for CStatic controls!) I really appreciate any
help.

Heres the code of what I have right now:

CpictureBox.h
------------------------------------------------------------------------------------------------------
class CPictureBox : public CStatic
{
DECLARE_DYNAMIC(CPictureBox)

public:
CPictureBox();
virtual ~CPictureBox();
void SetBitmap(CString strBitmap);
protected:
afx_msg void OnPaint();
void ShowBitmap(CPaintDC *pDC);
CString m_sBitmap;
CBitmap m_bmpBitmap;
BITMAP bm;
CRect m_Rect;

DECLARE_MESSAGE_MAP()
};

void CPictureBox::OnLButtonDown(UINT nFlags, CPoint point)
{
  m_Tracking = TRUE;
  SetCapture();
  m_Rect.right = m_Rect.left = point.x;
  m_Rect.bottom = m_Rect.top = point.y;
  Invalidate();
  CStatic::OnLButtonDown(nFlags, point);

}

------------------------------------------------------------------------------------------------------

CPictureBox.cpp -- These dont get the control when events are fired!

----------------------------------------------------------------------------------------------------
void CPictureBox::OnMouseMove(UINT nFlags, CPoint point)
{
  if (m_Tracking)
  {
     m_Rect.right = point.x;
     m_Rect.bottom = point.y;
     Invalidate();
  }

  CStatic::OnMouseMove(nFlags, point);
}

----------------------------
Main Dialog.cpp--
-----------------
BEGIN_MESSAGE_MAP(CmfcThsProj1Dlg, CDialog)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
//}}AFX_MSG_MAP
ON_BN_CLICKED(IDC_BTN_BROWSE, OnBnClickedBtnBrowse)
ON_WM_MOUSEMOVE()
ON_STN_CLICKED(IDC_STATIC_PICBOX, OnStnClickedStaticPicbox)
END_MESSAGE_MAP()

void CmfcThsProj1Dlg::OnStnClickedStaticPicbox()
{
// TODO: Add your control notification handler code here
MessageBox("hello world");
//CPictureBox::OnLButtonUp
//m_PictureBox.Invalidate();
}

----------------------------------------------------------

-Thanks

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