On Tue, Aug 27, 2013 at 9:44 PM, David Boddie <da...@boddie.org.uk> wrote:
> On Tue Aug 27 15:53:59 BST 2013, Sarah Mount wrote: > > > sorry if this is a bit of a n00b question, but hopefully someone can > > clarify a misunderstanding for me. I am working with some colleagues on a > > Python2.x PyQt4 project and the GUI for this software has several > drop-down > > lists where each entry in the list is an integer, in numerical order. We > > have had a (reproducible) bug report about these. > > No problem. Sometimes what seems to be the simplest things can have > surprising behaviour. > > Indeed :) > > When a user clicks on the drop-down and types a number, the drop-down > > scrolls to select that number. So, [contrived example] if the drop-down > > contains entries 0-1000 and the user types 23, the drop-down scrolls to > > reveal 23 (if necessary) and selects that entry on the list. So far, so > > standard. > > > > If the user selects a number with repeated digits, i.e. any multiple of > 11 > > (in reality only tested on numbers <100) the wrong number is selected. > For > > example, if I open a drop-down and type "77" "70" gets selected. Is this > > some obvious bug in the way we have configured our GUI or have I > > misunderstood something really basic? > > No, I think it's a bug in Qt, and probably in QAbstractItemView because > that's what is providing the underlying list logic in the drop-down menu. > The behaviour seems to be that the string used to search the data is > checked > to see if it is simply the same first character repeated throughout the > string (e.g., "aaa" or "333") and handled specially. This seems to > completely > break the regular behaviour: if you try "77", it won't work, but "776" will > cause it to navigate to the correct item. > > That makes sense. Is there an issue tracker I can submit this to? > If anyone wants to sanity check my reasoning, I think the problem is in > QAbstractItemView::keyboardSearch(). > > I can't immediately suggest a workaround. My instinct would be to use a > completer to influence the way QComboBox finds items but I don't know if > that will help, especially when the drop-down is open. > > I think in reality it is not a huge issue for users, although it's not ideal. I would guess that most integer input is probably not appropriately done with drop-downs! Thanks, Sarah -- Sarah Mount, Senior Lecturer, University of Wolverhampton website: http://www.snim2.org/ twitter: @snim2
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