if (!_AfxCheckDialogTemplate(m_lpszTemplateName, TRUE)) { ASSERT(FALSE); // invalid dial

最新推荐文章于 2019-03-27 16:10:50 发布

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本文详细解析了 CFormView 类的构造函数及创建方法实现，包括两种构造函数的初始化过程，以及重写 CWnd::Create 方法的具体流程。通过分析展示了如何使用模板资源创建模式对话框，并设置其样式和位置。

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CFormView::CFormView(LPCTSTR lpszTemplateName)
{
	m_lpszTemplateName = lpszTemplateName;
	m_pCreateContext = NULL;
	m_hWndFocus = NULL;     // focus window is unknown
}

CFormView::CFormView(UINT nIDTemplate)
{
	ASSERT_VALID_IDR(nIDTemplate);
	m_lpszTemplateName = MAKEINTRESOURCE(nIDTemplate);
	m_pCreateContext = NULL;
	m_hWndFocus = NULL;     // focus window is unknown
}

// virtual override of CWnd::Create
BOOL CFormView::Create(LPCTSTR /*lpszClassName*/, LPCTSTR /*lpszWindowName*/,
	DWORD dwRequestedStyle, const RECT& rect, CWnd* pParentWnd, UINT nID,
	CCreateContext* pContext)
{
	ASSERT(pParentWnd != NULL);
	ASSERT(m_lpszTemplateName != NULL);

	m_pCreateContext = pContext;    // save state for later OnCreate

#ifdef _DEBUG
	// dialog template must exist and be invisible with WS_CHILD set
	if (!_AfxCheckDialogTemplate(m_lpszTemplateName, TRUE))
	{
		ASSERT(FALSE);          // invalid dialog template name
		PostNcDestroy();        // cleanup if Create fails too soon
		return FALSE;
	}
#endif //_DEBUG

	// initialize common controls
	VERIFY(AfxDeferRegisterClass(AFX_WNDCOMMCTLS_REG));
	AfxDeferRegisterClass(AFX_WNDCOMMCTLSNEW_REG);

	// call PreCreateWindow to get prefered extended style
	CREATESTRUCT cs; memset(&cs, 0, sizeof(CREATESTRUCT));
	if (dwRequestedStyle == 0)
		dwRequestedStyle = AFX_WS_DEFAULT_VIEW;
	cs.style = dwRequestedStyle;
	if (!PreCreateWindow(cs))
		return FALSE;

	// create a modeless dialog
	if (!CreateDlg(m_lpszTemplateName, pParentWnd))
		return FALSE;

	m_pCreateContext = NULL;

	// we use the style from the template - but make sure that
	//  the WS_BORDER bit is correct
	// the WS_BORDER bit will be whatever is in dwRequestedStyle
	ModifyStyle(WS_BORDER|WS_CAPTION, cs.style & (WS_BORDER|WS_CAPTION));
	ModifyStyleEx(WS_EX_CLIENTEDGE, cs.dwExStyle & WS_EX_CLIENTEDGE);

	SetDlgCtrlID(nID);

	CRect rectTemplate;
	GetWindowRect(rectTemplate);
	SetScrollSizes(MM_TEXT, rectTemplate.Size());

	// initialize controls etc
	if (!ExecuteDlgInit(m_lpszTemplateName))
		return FALSE;

	// force the size requested
	SetWindowPos(NULL, rect.left, rect.top,
		rect.right - rect.left, rect.bottom - rect.top,
		SWP_NOZORDER|SWP_NOACTIVATE);

	// make visible if requested
	if (dwRequestedStyle & WS_VISIBLE)
		ShowWindow(SW_NORMAL);

	return TRUE;
}

void CFormView::OnInitialUpdate()
{
	ASSERT_VALID(this);

	if (!UpdateData(FALSE))
		TRACE0("UpdateData failed during formview initial update.\n");

	CScrollView::OnInitialUpdate();
}

int CFormView::OnCreate(LPCREATESTRUCT lpcs)
{
	// since we can't get the create context parameter passed in
	//  through CreateDialog, we use a temporary member variable
	lpcs->lpCreateParams = (LPVOID)m_pCreateContext;
	return CScrollView::OnCreate(lpcs);
}