[Qgis-developer] Python Sorting a Layer Selector

[Heikki Vesanto]

Hi Nyall,

That seems like a great solution. I can get the combo boxes looking as
expected with ordering an layer type indicators.

Do you have an example of getting the selection results from that, or
a plugin that is currently using it?

With the QComboBox I use:

index1 = self.dlg.selectWithCombo.currentIndex()
selecting_layer = self.dlg.selectWithCombo.itemData(index1)
index2 = self.dlg.selectFromCombo.currentIndex()
select_from_layer = self.dlg.selectFromCombo.itemData(index2)

# Either select with all features or just selected ones
selected_test = self.dlg.selectedFeaturesCheckbox.isChecked()
if selected_test == 1:
       selecting_feats = selecting_layer.selectedFeatures()
   else:
       selecting_feats_iterator = selecting_layer.getFeatures()

Changing my boxes to QgsMapLayerComboBox results in:
Traceback (most recent call last):
  File "C:/Users/heikk/.qgis2/python/plugins\SelectWithin\select_within.py",
line 217, in run
    selecting_feats_iterator = selecting_layer.getFeatures()
AttributeError: 'NoneType' object has no attribute 'getFeatures'

-Heikki


On Sun, Jun 5, 2016 at 9:31 PM, Nyall Dawson <nyall.dawson at gmail.com> wrote:
>
> On 6 Jun 2016 6:28 AM, "Heikki Vesanto" <heikki.vesanto at gmail.com> wrote:
>>
>> Hey,
>>
>> I had a feature request through for a python plugin to sort layer
>> drop-down lists alphabetically:
>>
>> https://github.com/HeikkiVesanto/QGIS_Centroid_Within/issues/3
>>
>> This is a list of vector layers that are open, that are selected using
>> a QComboBox QT drop-down. I get the layers using:
>>
>> layers = QgsMapLayerRegistry.instance().mapLayers().values()
>>
>> Before adding them to the QT dialog:
>>
>> for layer in layers:
>>             if layer.type() == QgsMapLayer.VectorLayer:
>>                 self.dlg.selectWithCombo.addItem( layer.name(), layer )
>>                 self.dlg.selectFromCombo.addItem( layer.name(), layer )
>>
>> I would like to sort these layers based on their name, so layer.name().
>>
>> I got as far as sorting by name:
>> layers.sort(key=operator.methodcaller("name"), reverse=False)
>>
>> However this is case sensitive, with upper case appearing first. Does
>> anyone know of a plugin that implements sorting? Or an easy way to do
>> it. If all else fails I can revert back to case sensitive sorting.
>
> Why not use QgsMapLayerComboBox instead? This has sorting built in, and will
> help your plugin match the standard QGIS layer selector behaviour.
>
> Nyall
>>
>> -Heikki
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