[Qgis-user] Toggle Attribute

[Bernd Vogelgesang]

other ideas after my third coffee:

Maybe you could try with a virtual layer. I'm successfully working with
them to show me the status of to be controlled items with a
geometry-less maintenance-table. But I'm pretty confident that the same
logic would work with two geometry layers

If there was the possibility to query for that is_selected() you found,
it could be possible to just show the requested item and be otherwise
invisible. I will investigate later.

Drawback on Virtual layers is, that they seem to be not very performant,
but maybe my queries are just inefficient crap, who knows.

On 23.11.20 10:29, L.W. wrote:
> and there are some disadvantages ... first you have to set the layer
> active to which the symbol belongs.
>
> there is no "is_" derivat for "get object info" (i-icon with
> mouse-pointer), so nothing happened if the feautre attribute-dialog is
> shown, the feature is (different) highlighted but not the same way as
> "selected" (by the yellow buttons with mouse-pointer).
>
>
> Am 23.11.2020 um 10:06 schrieb L.W.:
>> I tried a little bit with "actions" but - I think you're right - there
>> is no onHover.
>>
>> anyway, I found a much more comfortable solution for the moment.
>>
>> I add the simple term "OR is_selected()" in the if clause for my symbol
>> to show the changed color (in my case I draw a line between two points)
>> and it worked like a charme.
>>
>> But, this is without the option to e.g. display a messagebox or someting
>> like that with additional informations of the feature (I know about map
>> hints/tips (I do not know the right translation).
>>
>> Yes you could made an action for that, but my goal was to show this on
>> hover, but click is oooookay.
>>
>> For X-Mas my wish in relation to QGIS is a hover event ... on feature on
>> map and on symbols. ;-)
>>
>> Thanks for helping to everyone.
>>
>>
>> PS: Do I have to implement a Plugin to have a dockable window for
>> showing infos non modal on per action selected features?
>>
>>
>> Am 23.11.2020 um 09:40 schrieb Richard Duivenvoorde:
>>> On 11/22/20 8:40 PM, Jésahel Benoist wrote:
>>>> The actions are a standard way of acting on graphical objects, so
>>>> for me it would be the first thing to try. Did you ?
>>>>
>>>> Le dim. 22 nov. 2020 à 20:01, Bernd Vogelgesang
>>>> <bernd.vogelgesang at gmx.de <mailto:bernd.vogelgesang at gmx.de>> a écrit :
>>>>
>>>>      if you would be so kind to explain the "just" part of your
>>>> proposal?
>>> I think in the User lists it is always good to add a link to some
>>> documentation about a QGIS-term. In this case 'actions' kan be a
>>> normal word, but (advanced) users maybe (or not) know that it is also
>>> something you can use to 'do something in QGIS upon a click on a
>>> feature'.
>>>
>>> Some documentation here:
>>> https://docs.qgis.org/testing/en/docs/user_manual/working_with_vector/vector_properties.html#actions-menu
>>>
>>>
>>> (or do a search on 'actions' in the QGIS docs site).
>>> Tip: go to vector layer properties, 'Actions' tab, and hit 'Create
>>> Default Actions' button. You will get all kind of examples.
>>>
>>> About original post: I do not think we have an Action on hover (plz
>>> correct me if I'm wrong), but to run some (PyQGIS) python code is
>>> doable.
>>> With PyQGIS you can search for features in other layers, and maybe
>>> 'select' these on click in the other layer (or change attribute,
>>> though I'm not sure how to change it back then... )
>>>
>>> Acutally this sounds like nice functionality for layers which have
>>> relations... I'm not so experienced with relations in layers.
>>>
>>> If you worked out a way to do this, plz let us know :-)
>>>
>>> Regards,
>>>
>>> Richard
>>>
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