C++/(MFC)CDialog resize

// 헤더
	BOOL m_bSizing;
	RECT initClientRect;
	RECT prevClientRect;

void OnSizeHelper(RECT rect);

inline void ChildWndMove(CWnd& childWnd, RECT& diffRect, BOOL leftright = FALSE)
	{
		CRect childWndRect;
		childWnd.GetWindowRect(&childWndRect);
		ScreenToClient(&childWndRect);
		if (leftright)
		{
			childWndRect.bottom += diffRect.bottom;
			childWndRect.top += diffRect.bottom;
			childWndRect.left += diffRect.left;
			childWndRect.right += diffRect.right;
		}
		else
		{
			childWndRect.bottom += diffRect.bottom;
			childWndRect.top += diffRect.bottom;
			childWndRect.left += diffRect.right;
			childWndRect.right += diffRect.right;
		}

childWnd.MoveWindow(childWndRect.left, childWndRect.top, childWndRect.Width(), childWndRect.Height());
		childWnd.RedrawWindow();
	}

inline void ChildWndSpan(CWnd& childWnd, RECT& diffRect)
	{
		CRect childWndRect;
		childWnd.GetWindowRect(&childWndRect);
		ScreenToClient(&childWndRect);
		childWndRect.bottom += diffRect.bottom;
		childWndRect.top += diffRect.top;
		childWndRect.left += diffRect.left;
		childWndRect.right += diffRect.right;
		childWnd.MoveWindow(childWndRect.left, childWndRect.top, childWndRect.Width(), childWndRect.Height());
		childWnd.RedrawWindow();
	}

// 생성자
	m_bSizing = FALSE;
	ZeroMemory(&initClientRect, sizeof RECT);
	ZeroMemory(&prevClientRect, sizeof RECT);

// OnInitDialog()
	GetWindowRect(&initClientRect);
	prevClientRect = initClientRect;
	ScreenToClient(&prevClientRect);

m_bSizing = TRUE;

// MESSAGE_MAP
	ON_WM_GETMINMAXINFO()
	ON_WM_SIZE()

//
void C____Dlg::OnSize(UINT nType, int cx, int cy)
{
	CDialogEx::OnSize(nType, cx, cy);

if (m_bSizing)
	{
		RECT rect;
		GetWindowRect(&rect);
		OnSizeHelper(rect);
}

void C____Dlg::OnSizeHelper(RECT rect)
{
	ScreenToClient(&rect);

RECT diffRect;
	diffRect.bottom = rect.bottom - prevClientRect.bottom;
	diffRect.top = rect.top - prevClientRect.top;
	diffRect.left = rect.left - prevClientRect.left;
	diffRect.right = rect.right - prevClientRect.right;

// Child Move
	ChildWndMove(m_btnMenu1, diffRect);
	ChildWndMove(m_btnMenu2, diffRect);
	ChildWndMove(*GetDlgItem(IDC_BTN_RELOAD), diffRect);
	ChildWndMove(*GetDlgItem(IDC_BTN_DELETE), diffRect);
	ChildWndMove(*GetDlgItem(IDC_BTN_DELETEALL), diffRect);
	ChildWndMove(m_btnConfig, diffRect);
	ChildWndMove(m_btnHelp, diffRect);
	ChildWndMove(*GetDlgItem(IDC_STATIC_COPYRIGHT), diffRect, TRUE);
	
	// Child Span
	ChildWndSpan(m_folderList, diffRect);

prevClientRect = rect;
}