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Toolbox textarea and associated window handle

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Is there any general way of getting at the window handle of the
window that textgadgets/textarea creates to implement a text area?

The problem is compounded by the different versions of textgadgets
out there.

Scenario: In a window there is a large textarea gadget which is used
to display user editable text, and which is intended to also accept
text files dragged to it. When the file is dropped, the data transfer
wimp message received contains a window handle which is that of the
textarea gadget and not the containing window. I have found no way of
confirming that this handle belongs to the app. The SWI
'Window_WimpToToolbox' returns 0 as it is not known to the toolbox.
The toolbox IDblock at the time contains 0 and -1 for the 'this_obj'
and 'this_cmp' since it is a wimp event and not a toolbox event.

I know (a) later versions of Select implement a
'Textarea_GetWindowID' method, and (b) some versions of textgadgets
have their own load capability. However others do not.

I suppose the fudge would be to ignore the window handle and load any
text file offered into the textarea (if the window is actually
showing), perhaps with the additional check of comparing the pointer
position with the textarea bounding box.

Are there any suggestions for a better way?

-- 
Chris Johnson

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Toolbox textarea and associated window handle Chris Johnson <chrisjohnson+news@spamcop.net> - 2011-08-11 10:57 +0100
  Re: Toolbox textarea and associated window handle druck <news@druck.org.uk> - 2011-08-13 15:01 +0100
    Re: Toolbox textarea and associated window handle Chris Johnson <chrisjohnson+news@spamcop.net> - 2011-08-13 15:33 +0100

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