CDocument::AddView
Call this function to attach a view to the document.
void AddView(
CView* pView
);
Parameters
- pView
Points to the view being added.
Remarks
This function adds the specified view to the list of views associated with the document; the function also sets the view's document pointer to this document. The framework calls this function when attaching a newly created view object to a document; this occurs in response to a File New, File Open, or New Window command or when a splitter window is split.
Call this function only if you are manually creating and attaching a view. Typically you will let the framework connect documents and views by defining a CDocTemplate object to associate a document class, view class, and frame window class.
Example
// 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.
void CMainFrame::OnViewChange(UINT nCmdID)
// There is an ON_COMMAND_RANGE message map entry associated with
// OnViewChange:
// ON_COMMAND_RANGE(ID_VIEW_CHANGE1, ID_VIEW_CHANGE2, &OnViewChange)
{
CView* pViewAdd;
CView* pViewRemove;
CDocument* pDoc = GetActiveDocument();
// cvView1 and cvView2 are enum members defined in my CMainFrame class
if((nCmdID == ID_VIEW_CHANGE1) && (m_currentView == cvView1))
return;
if((nCmdID == ID_VIEW_CHANGE2) && (m_currentView == cvView2))
return;
if (nCmdID == ID_VIEW_CHANGE2)
{
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 = cvView2;
}
else
{
pViewAdd = m_pView1;
pViewRemove = m_pView2;
m_currentView = cvView1;
}
// 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();
}
Requirements
Header: afxwin.h
See Also
Reference
CDocument::GetFirstViewPosition