Re: MFC..View的切換..

水漾的瓶子 <[e-mail]> wrote in message
news:3SeI2M$[e-mail]...
>請問...
>在MFC SDI中...
>我我要如何才能把..原來的View..
>在程式執行時.動態的轉換到另一個View呢..
>也就是說有兩個view可以切換.....
>--

    引一段 MSDN 的 Code ...

// The following example toggles two views in an SDI (single document
// interface) frame window. A design decision must be made as to
// whether to leave the inactive view connected to the document,
// such that the inactive view continues to receive OnUpdate
// notifications from the document. It is usually desirable to
// keep the inactive view continuously in sync with the document, even
// though it is inactive. However, doing so incurs a performance cost,
// as well as the programming cost of implementing OnUpdate hints.
// It may be less expensive, in terms of performance and/or programming,
// to re-sync the inactive view with the document only with it is
// reactivated. This example illustrates this latter approach, by
// reconnecting the newly active view and disconnecting the newly
// inactive view, via calls to CDocument::AddView and RemoveView.
BOOL CMainFrame::OnViewChange(UINT nCmdID)
{
CView* pViewAdd;
	CView* pViewRemove;
	CDocument* pDoc = GetActiveDocument();
	UINT nCmdID;
	nCmdID = LOWORD(GetCurrentMessage()->wParam);
	if((nCmdID == ID_VIEW_VIEW1) && (m_currentView == 1))
		return;
	if((nCmdID == ID_VIEW_VIEW2) && (m_currentView == 2))
		return;
	if (nCmdID == ID_VIEW_VIEW2)
	{
		if (m_pView2 == NULL)
		{
			m_pView1 = GetActiveView();
			m_pView2 = new CMyView2;
			//Note that if OnSize has been overridden in CMyView2
			//and GetDocument() is used in this override it can
			//cause assertions and, if the assertions are ignored,
			//cause access violation.
			m_pView2->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
			      rectDefault, this, AFX_IDW_PANE_FIRST + 1, NULL);
		}
		pViewAdd = m_pView2;
		pViewRemove = m_pView1;
		m_currentView= 2;
	}
	else
	{
		pViewAdd = m_pView1;
		pViewRemove = m_pView2;
		m_currentView= 1;
	}
	// Set the child i.d. of the active view to AFX_IDW_PANE_FIRST,
	// so that CFrameWnd::RecalcLayout will allocate to this
	// "first pane" that portion of   the frame window's client area
	// not allocated to control   bars.  Set the child i.d. of the
	// other view to anything other than AFX_IDW_PANE_FIRST; this
	// examples switches the child id's of the two views.
	int nSwitchChildID = pViewAdd->GetDlgCtrlID();
	pViewAdd->SetDlgCtrlID(AFX_IDW_PANE_FIRST);
	pViewRemove->SetDlgCtrlID(nSwitchChildID);

	// Show the newly active view and hide the inactive view.
	pViewAdd->ShowWindow(SW_SHOW);
	pViewRemove->ShowWindow(SW_HIDE);

	// Connect the newly active view to the document, and
	// disconnect the inactive view.
	pDoc->AddView(pViewAdd);
	pDoc->RemoveView(pViewRemove);

	SetActiveView(pViewAdd);
	RecalcLayout();
}