MFC: Can we extend the CEdit control class behaviour present in CEditView - c++

Question

I read few basics about MFC and I am trying to implement simple editor using CEditView. Please correct if my current understanding is wrong.
CEditView is just a view, physically there won't be any control placed in it.
CEditView is just the area, where user can see and enter the text.
Explicitly no need to place any CEdit control on to the view (like
we put CEdit control on the CDialogView).
CEdit control is just a member of CEditView.(GetEditCtrl()).
Currently CEdit provides so many edit related features. If I want to extend that CEdit member class, is it possible to do it? It's something like:
Class CMyEdit : public CEdit
From MSDN:
You construct a CEdit object in two steps. First, call the CEdit
constructor and then call Create, which creates the Windows edit
control and attaches it to the CEdit object.
I create dummy constructor:
CMyEdit::CMyEdit
{
}
After that I called Create:
virtual BOOL Create(
DWORD dwStyle,
const RECT& rect,
CWnd* pParentWnd,
UINT nID);
//Here I have given dummy CRect and dummy Control ID that is 1;
myEdit->Create(ES_MULTILINE | WS_CHILD |
WS_VISIBLE | WS_TABSTOP |
WS_BORDER,CRect(10, 10, 100, 100), this, 1);
If I create and when I run the program, CEdit control is coming onto the CEditView. But I don't want that physical control onto the CEditView.
Do we need to create method here? Not sure how to extend this CEdit class behaviour without creating the control.

Answer 1

CEditView is a CEdit as a view, In fact In a CEdit and in a CEditView there is a normal Windows API Edit control inside. It is a little trick, that the MFC is using. It creates a simple Edit control, (so there is one window handle), but you can treat this handle via a CView pointer AND a CEdit pointer. When you look into the code, you see that GetEditCtrl just casts the this pointer.
When you create a View with a CEditView you have always a CEdit/Edit control inside... you can't change that.
Sure that you get a new edit control over a CEditView if you create an additional control inside of it.
If you can't create a CMyEditView derived from CView with a CMyEdit inside of it (using the full view).
The easiest way would just be to extend a CEditView to a CMyEditView...

Answer 2

It is not very clear what behavior you are trying to modify but looks like you are aware that in MFC you can create your own custom control. You can override the methods of your CEdit in the custom control class CMyEdit like OnPaint() etc. and achieve the same. You should go through with the tutorial which mentioned in details about the custom controls and then you will get to know what all methods you need to override in your custom controls.