How to make text in edit control overwriteable

How do I make a edit control such that the text inside
can be overwritten. Like what happens in text editiors.
LVL 1
kumaranaAsked:
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RONSLOWCommented:
Edit controls can already work that way.  In fact the MFC multipad example (ike notepad) uses an edit control as a view.

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shaqshupCommented:
What do you mean by overwritten? Edit controls by default select all of the text inside them when they get focus. Typing anything while it has focus will remove the selection and thus the contents of the edit control.
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kumaranaAuthor Commented:
I think I did not explain by problem compeletly.I want overwrite feature to happen without a selection being made. For example in Wordpad I press the INS key it starts overwriting text.
Now I have implemented by subclassing the edit and on OnChar() function if I find the cursor is not at end of the entered text, then I send VK_DELETE and then call base class CEdit::OnChar() something like below

OnChar(....){
  // get caret pos
  CPoint p = GetCaretPos();

  // get position of caret in edit box
  int pos = CharFromPos(P);

  // Get length of text
  GetDlgItemText( CurrData);
  int len = strlen( CurrData );

  if ( pos < len ) {
    SendMessage( KEY_DOWN, VK_DELETE );
  }
  OnChar(...);
}
 
Is there any other method?
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RONSLOWCommented:
This might work in OnChar(...):

   if (isprint(nChar)) {
       int nStart,nEnd;
       GetSel(nStart,nEnd);
       if (nEnd == nStart) {
           nEnd++;
           SetSel(nStart,nEnd);
       }
       CEdit::OnChar(...)
    }

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RONSLOWCommented:
An alternative is to use a rich-edit control instead of an edit control (set it to plain text mode).  This supports insert/overwrite mode.

However, I am not sure how to detect or get the overwrite mode without doing it yourself.

I'd suggest you subclass the control to include a bool indicating overwrite mode.  Init this to false.  In your OnChar, detect the VK_INSERT key.  If found, toggle the state of the flag.  You can then add a 'SetOverwriteMode' function that checks the flag, and if not set to overwrite, sends a VK_INSERT to the control.  Similarly for detecting and setting insert mode

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RONSLOWCommented:
BTW: my comment about the multipad sample is incorrect.  It does NOT support overwrite mode (nor does Notepad).  It appears only rich-edit controls natively support insert/overwrite mode.


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