[Qgis-developer] Python Sorting a Layer Selector

[Heikki Vesanto]

Hey Nyall,

That seems to have work perfectly.

My code is condensed to:
selecting_layer = self.dlg.selectWithCombo.currentLayer()
select_from_layer = self.dlg.selectFromCombo.currentLayer()

Making much of the former functions of.

Clearing:

self.dlg.selectWithCombo.clear()
self.dlg.selectFromCombo.clear()

And populating :
for layer in layers:
if layer.type() == QgsMapLayer.VectorLayer:
self.dlg.selectWithCombo.addItem( layer.name(), layer )
self.dlg.selectFromCombo.addItem( layer.name(), layer )

Redundant.

Thanks for the help!

-Heikki

On Mon, Jun 6, 2016 at 12:10 AM, Nyall Dawson <nyall.dawson at gmail.com> wrote:
> On 6 June 2016 at 08:23, Heikki Vesanto <heikki.vesanto at gmail.com> wrote:
>> Hi Nyall,
>>
>> That seems like a great solution. I can get the combo boxes looking as
>> expected with ordering an layer type indicators.
>
> Another advantage is that the built in box automatically handles layer
> removal and additions, without any extra code required :)
>
>>
>> Do you have an example of getting the selection results from that, or
>> a plugin that is currently using it?
>
> Use QgsMapLayerComboBox.currentLayer()
>
> (see https://qgis.org/api/classQgsMapLayerComboBox.html#ae2ca2dd3e8cbc81cf0e19244e63efe5a)
>
> Nyall
>
>
>>
>> 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
>>>> _______________________________________________
>>>> Qgis-developer mailing list
>>>> Qgis-developer at lists.osgeo.org
>>>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer