CDocument::GetNextView

最新推荐文章于 2016-11-21 16:27:54 发布

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本文介绍了一个用于遍历文档中所有视图的函数GetNextView，该函数通过传递POSITION值来获取下一个视图，并更新该值以便继续遍历。示例展示了如何使用此函数更新文档中的所有视图。

Call this function to iterate through all of the document's views.

virtual CView* GetNextView(

   POSITION& rPosition 

) const;

Parameters

rPosition

A reference to a POSITION value returned by a previous call to the GetNextView or GetFirstViewPosition member functions. This value must not be NULL .

Return Value

A pointer to the view identified by rPosition .

Remarks

The function returns the view identified by rPosition and then sets rPosition to the POSITION value of the next view in the list. If the retrieved view is the last in the list, then rPosition is set to NULL .

Example

Visual C++

复制代码

//To get the first view in the list of views:


// POSITION pos = GetFirstViewPosition();


// CView* pFirstView = GetNextView(pos);


//


// This example uses CDocument::GetFirstViewPosition


// and GetNextView to repaint each view.


// An easier way to accomplish the same result is to call


// UpdateAllViews(NULL);


void
 CExampleDoc::OnRepaintAllViews()

{

   POSITION pos = GetFirstViewPosition();

   while
 (pos != NULL)

   {

      CView* pView = GetNextView(pos);

      pView->UpdateWindow();

   }   

}