Visual C++ and MFC Programming 2nd Edition

Chapter 15: Fundamental Controls Visual C++ and MFC Fundamentals

GetClientRect() function is called to get the dimensions of the view’s client area of a

frame-based application and use the resulting rectangle to paint that area:

void CCView1View::OnPaint()

{

CPaintDC dc(this); // device context for painting

// TODO: Add your message handler code here

CRect Recto;

CBrush SelectedBrush(SelectedColor);

CPen SelectedBlue(PS_SOLID, 1, SelectedColor);

GetClientRect(&Recto);

CBrush *pOldBrush = dc.SelectObject(&SelectedBrush);

CPen *pOldPen = dc.SelectObject(&SelectedBlue);

dc.Rectangle(Recto);

dc.SelectObject(pOldBrush);

// Do not call CView::OnPaint() for painting messages

}

Once the control is already positioned on the client area, to get its location and

dimensions, you can call the CWnd::GetWindowRect() method. Here is an example:

void CTabDlg::OnBtnInfo()

{

// TODO: Add your control notification handler code here

CRect Recto;

char LocDim[80];

m_Panel.GetWindowRect(&Recto);

sprintf(LocDim, " - Panel Information -\nLeft: %d,"

"\nTop: %d,\nWidth: %d,\nHeight: %d",

Recto.left, Recto.top, Recto.Width(), Recto.Height());

MessageBox(LocDim);

}

Practical Learning: Using the Client Area

1. Open the Geometry application you were working on earlier


2. Open the Quadrilateral.cpp source file and change its OnPaint() event as follows: