[QGIS-Developer] Temporal Controller: Select current visible features??

[Richard Duivenvoorde]

Thanks Nyall!!

With a minimal adjustments this just works:

def temporal_filter_for_layer(layer, canvas):
   if canvas.mapSettings().isTemporal():
     if not layer.temporalProperties().isVisibleInTemporalRange(canvas.temporalRange()):
       return False # nothing is visible
     temporal_context = QgsVectorLayerTemporalContext()
     temporal_context.setLayer(layer)
     return layer.temporalProperties().createFilterString(temporal_context, canvas.temporalRange())
   else:
     return None

print( temporal_filter_for_layer(iface.mapCanvas().currentLayer(), iface.mapCanvas()) )

Now prints:

("time" > make_datetime(2022,3,20,10,30,0) AND "time" < make_datetime(2022,3,20,12,30,0)) OR "time" IS NULL

Which I can use as expression in: layer.selectByExpression(...)

Regards,

Richard Duivenvoorde

PS also see my Feature Request: https://github.com/qgis/QGIS/issues/47929 about adding an option to switch between selecting visible vs non visible features...

On 3/21/22 23:59, Nyall Dawson wrote:
>> Anybody aware of a way to do this?
>> Going to try to get the temporal expression maybe and then select by
>> expression?
> 
> untested code ported from tested c++ code, sorry, but it's something like this:
> 
> def temporal_filter_for_layer(layer, canvas):
>    if canvas.mapSettings().isTemporal():
>      if not layer.temporalProperties().isVisibleInTemporalRange(
> canvas.temporalRange() ) ):
>        return "FALSE"; # nothing is visible
> 
>      temporal_context = QgsVectorLayerTemporalContext()
>      temporal_context.setLayer( layer )
>      return layer.temporalProperties().createFilterString(
> temporal_context, canvas.temporalRange() )
>    else:
>      return None
> 
> Nyall