CDocument::AddView
void AddView(CView* pView);
参数:
说明:
调用该成员函数将视图添加到文档中。该函数将指定视图加入与文档相联系的视图列表之中。函数还设置指向文档的视图指针。当添加一个新创建的视图对象到文档时,框架调用该函数。这是对File Open,FileNew,新的Windows 或窗口被分隔等作出的反应。
仅在手工创建和添加视图时调用该函数。通常通过定义与文档类、视图类和框架窗口类相联系的CDocTemplate对象来连接框架窗口与视图、文档。
示例:
// The following example toggle 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
// 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(UNIT nCmdID)
{
CView* pViewAdd;CView* pViewRemove;
CDocument* pDoc = GetActiveDocument();
UNIT 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 beenoverridden in CMy View2
//and GetDoument()is used in this overrideit can
//cause assertions and,if theassertions 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_LDW_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();
}
请参阅:
CDocTemplate, CDocument::GetFirstViewPosition, CDocument::GetNextView, CDocument::RemoveView, CView::GetDocument