[Qgis-developer] Expression editor icon

[Matthias Kuhn]

Hi,

On 01/29/2013 10:53 AM, Matthias Kuhn wrote:
> Hi
> On Wed, Aug 15, 2012 at 8:48 PM, Larry Shaffer 
> <larrys at dakotacarto.com> wrote:
>>>>> Hi,
>>>>>
>>>>> This is a request for Robert, but some input from others would 
>>>>> help out.
>>>>>
>>>>> Peppered throughout the GUI are buttons with only '...' for opening
>>>>> the expression editor. A button with only '...' is a bit vague. It
>>>>> would be nice to have a specific icon for the expression editor to 
>>>>> add
>>>>> to buttons and the ui, where needed.
>>>>>
>>>>> Any ideas for what it should look like, or characters it should be
>>>>> based on, like maybe:  ('exp')  ?
>>>>>
>>>> What about the greek 'sum' symbol which is commonly used for this?
>>>>
>>>> Regards
>>>>
>>>> Tim
>>>
>>> Do you mean upper case sigma Tim [1]?
>> Sorry yes I meant sigma
>>
>>> We have it already, but probably it's too strongly related to 'sum' or
>>> 'statistics'.
>>> What about
>>> - lowercase epsilon [2],
>>> - f()
>>> - integral sign? which in fact is sort of sum :), but looks more
>>> "scientific"
>>>
>>> According to some design rules, one should avoid using letters where
>>> possible.
>> Yes agreed - though I wonder if mathematical symbols are used
>> universally across locales?
>>
>> Regards
>>
>> Tim
>>
>>> Robert
>>>
>>> [1]
>>> http://trac.osgeo.org/osgeo/browser/graphics/trunk/toolbar-icons/24x24/stats.svg 
>>>
>>> [2] http://en.wikipedia.org/wiki/Epsilon
>>>
>>>>> Regards,
>>>>>
>>>>> Larry
>>>
>
> Has there any progress been made concerning this topic?
>

Sorry for posting again, but I forgot to give some context to the question.

I'm incorporating the expression builder in different places recently.

Pull request #406 uses a QgsExpressionBuilder to alter the selection [1]
My current work on the attribute editor offers to use a 
QgsExpressionBuilder in different places. It would be nice to have 
appropriate icons to give the user some hints about what he is going to 
initiate with a click on that button.

I imagine a combination of this icon together with other icons:
* Expression + Selection (Maybe even different icons with a plus, minus, 
intersect)
* Expression + Filter
* Expression + Preview (It's about a feature identification string. 
Maybe ABC or something...)

[1]: https://github.com/qgis/Quantum-GIS/pull/406

Regards,
Matthias