Re: [ANN]: TkDND 2.0 alpha...

    Another case to review would be to drag an email from Outlook. I did
not manage to make it work with current tkdnd.

Ramon Ribó

En Mon, 03 Apr 2006 00:00:55 +0200, Georgios Petasis
<petasis@iit.demokritos.gr> escribió:

>
> <vince.darley@gmail.com> wrote in message
> news:1144007842.714153.138480@z34g2000cwc.googlegroups.com...
>> Georgios Petasis wrote:
>>> I expect to be many problems with such an approach:
>>>
>>> 1) The uses do not justify the efford put into it. We are talking about
>>> a very complex scheme, where the control of the transfer must be passed
>>> to the caller (outside of tkdnd). This is dangerous, as there are a lot
>>> of
>>> things
>>> that can go wrong.
>>>
>>> 2) When the transfer is over, you have to deliver an event to the
>>> drag source, to notify that you have finished getting the data, or that
>>> you are not interested any more in the drop. How is this to be handled?
>>> You must rely on the user to call a function? In 99% of the cases they
>>> won't.
>>
>> But isn't this roughly the model that MacOS X uses?: the source
>> _promises_ some data, and then the drop site has to request it. It is
>> only at that point that the source actually provides the data. Of
>> course things can go wrong, and that's what error conditions are for.
>> ("drop cancelled/failed/...", etc).
>>
>> To me, any API that forces all the data to be provided up front is not
>> appropriate for a general drag-n-drop mechanism.
>>
>> Certainly for many common cases it is easy to provide the data up front
>> (and that should be supported), but equally for many other common cases
>> it is quite hopeless to provide all the data up front.
>>
>> Vince.
>>
>
> What are these cases? The only one I know of is under windows, when
> dragging files from compressed folders (or from winzip). It would be
> interested
> to know more cases.
>
> George
>
>

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