Encapsulating interacting controls

// CustomControl.cpp : implementation file
//

#include "stdafx.h"
#include "cc4.h"
#include "CustomControl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define CRH_CUSTOMCONTROL_CLASSNAME    _T("CRH_CustomControl")  // Window class name

/////////////////////////////////////////////////////////////////////////////
// CRH_CustomControl

CRH_CustomControl::CRH_CustomControl()
{
    RegisterWindowClass();
}

CRH_CustomControl::~CRH_CustomControl()
{
}


BEGIN_MESSAGE_MAP(CRH_CustomControl, CWnd)
	//{{AFX_MSG_MAP(CRH_CustomControl)
		// NOTE - the ClassWizard will add and remove mapping macros here.
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CRH_CustomControl message handlers

BOOL CRH_CustomControl::RegisterWindowClass()
{
    WNDCLASS wndcls;
    HINSTANCE hInst = AfxGetInstanceHandle();

    if (!(::GetClassInfo(hInst, CRH_CUSTOMCONTROL_CLASSNAME, &wndcls)))
    {
        // otherwise we need to register a new class
        wndcls.style            = CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
        wndcls.lpfnWndProc      = ::DefWindowProc;
        wndcls.cbClsExtra       = wndcls.cbWndExtra = 0;
        wndcls.hInstance        = hInst;
        wndcls.hIcon            = NULL;
        wndcls.hCursor          = AfxGetApp()->LoadStandardCursor(IDC_ARROW);
        wndcls.hbrBackground    = (HBRUSH) (COLOR_3DFACE + 1);
        wndcls.lpszMenuName     = NULL;
        wndcls.lpszClassName    = CRH_CUSTOMCONTROL_CLASSNAME;

        if (!AfxRegisterClass(&wndcls))
        {
            AfxThrowResourceException();
            return FALSE;
        }
    }

    return TRUE;
}