Re: Verifying Entry inputs

On Sat, 2005-02-26 at 08:43 -0300, Christian Reis wrote:
>On Fri, Feb 25, 2005 at 11:08:00AM +0000, Gustavo J. A. M. Carneiro wrote:
>>   My solution, although also not perfect, was to place a small
>> gtk.STOCK_DIALOG_WARNING icon inside the entry, and toggle between
>> making it insensitive (=value OK) or sensitive (=bad value).
>
>Interesting! Can we see some screenshots of this?

  Attached.  Code in [1], but you won't be able to run it without
modifications (or installing gnumexp), I'm afraid.

> I had never thought of
>this approach and it sounds way cool (though it _does_ take up some of
>the entry's real estate). Dream scenario might be a window which
>overlays the screen when a validation error occurs.

  Now that I don't understand.  Can you explain better?  "window which
overlays the screen"?

  An interesting idea that I might try someday would be to reserve some
empty space in the dialogue window, and display in that space validation
errors as they occur.

>One of the issues with validation is a performance issue -- some stuff
>takes a while to validate (checking database contents, etc).

  In my case, validation is very quick.  It is just about sending the
entry context through a math expression parser in a corba server.
Nevertheless, validation occurs only after 100ms timeout, to avoid
interrupting gtk+ event processing too often.
  

> Another is
>the fact that certain patterns are only really validatable when
>completely entered (i.e. 123. is invalid but 123.2 is not, though I'm
>thinking of more complex situations than this -- involving database
>contents as well).

  Well, if the validation feedback is non-intrusive, like in my example,
it's not too annoying to validate in real time, I think..

>
>This is one of the two major unsolved issues for me in UI work using
>GTK+. The other issue is selecting an item from a large (potentially
>database-driven) collection -- autocompletion combos are close, but
>still not what we really need.

  Fernando San Martin Woerner decided to use EntryCompletion for this,
and added a pixmap for validation, which is from where I stole my idea.
See PixEntryCompletion in [2].


[1]
http://cvs.sourceforge.net/viewcvs.py/numexp/gnumexp/src/xygraph/Numexp_XYGraph/dialogs/util.py?rev=1.11&view=auto
[2] http://www.galilea.cl/~snmartin/b2evolution/blogs/index.php

  Best regards.

-- 
Gustavo J. A. M. Carneiro
<gjc@xxxxxxxxxxxxx> <gustavo@xxxxxxxxxxxxxxxxxxxxx>
The universe is always one step beyond logic

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Screenshot-Plot Object-1.png
Description: PNG image

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