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List:       openjdk-openjfx-dev
Subject:    Re: [REVIEW REQUEST] Add support for an emptyText property in ComboBox
From:       Werner Lehmann <lehmann () media-interactive ! de>
Date:       2013-02-27 10:29:45
Message-ID: 512DE019.2080509 () media-interactive ! de
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Hi Richard,

yes, I think the "empty" item would usually map to null. I realize it is 
supported by the API with some manual effort (e.g. copy data to a new 
list, add null to it, use those as items for the combobox). I don't have 
a problem to keep doing this.

I guess there was just some confusion on my part because for ~10 years I 
am using extended comboboxes supporting this kind of "emptyText". So 
when I read the name emptyText I jumped to conclusions abouts it meaning 
(and initially was happy to have this built in) ;-)

Rgds
Werner

On 26.02.2013 20:44, Richard Bair wrote:
> I would guess that the use case you're thinking of here would map to a value of \
> "null", or would it map to some other arbitrary developer supplied value? 
> On Feb 21, 2013, at 5:39 AM, Werner Lehmann<lehmann@media-interactive.de>  wrote:
> 
> > emptyText only works for empty lists? I have overlooked this before. Basically it \
> > is equivalent to 
> > promptText = items.isEmpty ? "empty" : "select something"
> > 
> > I thought the combobox would always show the empty text (if specified), even when \
> > there are other items in the list. The usecase would be to explicitly show "no \
> > selection", and also to allow users to explicitly unselect. 
> > This is the primary usecase in my opinion... and it would be so useful to have \
> >                 this handled in the control:
> > - always show it as first item regardless of sort order of other items
> > - allow special styling to have it stand out from the rest
> > - application does not have to copy items to another list just to add a special \
> > empty-element (plus special code to handle selection) 
> > In constrast, an "emptyPromptText" does not achieve that much... in my opinion.
> > 
> > Werner
> > 
> > On 19.02.2013 01:39, Jonathan Giles wrote:
> > > I'm keen to add an 'emptyText' property to ComboBox. This property would
> > > be analogous to the 'promptText' property already supported, except that
> > > it would appear in the popup list area when the items list is empty
> > > (rather than in the text field when that is empty).


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