mfc, CDoc & CView comunication

microsoft.public.vc.mfc - Microsoft Visual C


mfc >> CDoc & CView comunication

by Ale » Sun, 19 Mar 2006 00:48:51 GMT

Hi there
I've got an object in my app's Doc class that contains all the info that
i need to draw. The object implements even a Draw method.
All I need to do is to call the Draw method of the Doc class from the
CView class, but I have no idea on how to do it.
What can I do?

thanks

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mfc >> CDoc & CView comunication

by Ajay Kalra » Sun, 19 Mar 2006 01:54:37 GMT







Draw method should not be in Document class. Document should simply contain
the data. When data needs to be updated in view, you can call UpdateAllViews
of the document. In your case you probably want to call OnDraw of your
object from OnDraw of the specific view.





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mfc >> CDoc & CView comunication

by David Wilkinson » Sun, 19 Mar 2006 02:02:21 GMT





Ale:

Every view can get a pointer to the document by using GetDocument().

However, it is not natural to put drawing code in the document class.
Rather do something like

CMyView::OnDraw(CDC* pDC)
{
CMyDocument* pDocument = GetDocument();
CMyObject* pObject = pDocument->GetMyObject();
CRect rect;
GetClientRect(&rect);
pObject->Draw(pDC, &rect));
}

David Wilkinson

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CDoc & CView comunication

by Tom Serface » Tue, 21 Mar 2006 00:20:18 GMT

In addition to what Dave and Ajay wrote, you can also force a redraw of a
view from a document by calling UpdateAllViews() from the CDocument and
having each CView handle an OnUpdate() message. Note that you can pass a
hint in the call to single the view or views to do whatever you want
(including invalidating themselves so they redraw).

Tom






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