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RichText Overkill

Posted on 1998-03-21
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Last Modified: 2013-11-19
I'm using a CRichEditView based MDI for large file support and custom colors/fonts, but I don't want users to be able to drag and drop anything but plain text into the client area, is there a simple way of disabling this without learning OLE?
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Question by:midthune
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3 Comments
 
LVL 15

Accepted Solution

by:
Tommy Hui earned 400 total points
ID: 1317123
Yes, you will need to derive a class from CRichEditView and override QueryAcceptData(). If the clipboard format is CF_TEXT, call the base class's implementation otherwise return S_FALSE.

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LVL 15

Expert Comment

by:Tommy Hui
ID: 1317124
Your code would look like

HRESULT CMyView::QueryAcceptData(LPDATAOBJECT lpdataobj, CLIPFORMAT* lpcfFormat,
      DWORD dwReco, BOOL bReally, HGLOBAL hMetaPict)
{
      if (lpcfFormat == NULL)
            return S_FALSE;

      if (!bReally)
            return S_OK;

      COleDataObject obj;
      obj.Attach(lpdataobj);
      if (obj.IsDataAvailable(CF_TEXT))
      {
            *lpcfFormat = CF_TEXT;
            obj.Detach();
            return S_OK;
      }
      else
      {
            obj.Detach();
      }

      TRACE("format = %d\r\n", *lpcfFormat);

      if (*lpcfFormat == CF_TEXT)
            return CRichEditView::QueryAcceptData(lpdataobj, lpcfFormat, dwReco,
                  bReally, hMetaPict);
      else
            return S_FALSE;
}

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Author Comment

by:midthune
ID: 1317125
Aha! Well, I was on the right track... I just didn't know what function to override (this OLE stuff is confusing for mere mortals like myself). Thank you!
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