[QGIS-Developer] MetaSearch provider connections in master

[Tom Kralidis]

On Mon, Nov 13, 2017 at 10:17 AM, Alessandro Pasotti <apasotti at gmail.com> wrote:
> On Mon, Nov 13, 2017 at 3:59 PM, Tom Kralidis <tomkralidis at gmail.com> wrote:
>>
>> On Mon, Nov 13, 2017 at 9:18 AM, Alessandro Pasotti <apasotti at gmail.com>
>> wrote:
>> > On Mon, Nov 13, 2017 at 3:06 PM, Tom Kralidis <tomkralidis at gmail.com>
>> > wrote:
>> >>
>> >> Hi devs:
>> >>
>> >> Given https://issues.qgis.org/issues/17347 I'm working on fixing
>> >> MetaSearch
>> >> provider connections in master. The core part of the code is currently
>> >> at
>> >> [1]. A
>> >> standalone example can be found at [2].  Result is that the WMS/WMTS
>> >> provider
>> >> opens connecting to the selected WMS/WMTS (good).  When clicking 'Ok',
>> >> 'Close',
>> >> or 'Add', the WMS/WMTS layer is added (expecting 'Close' to simply
>> >> close the dialog
>> >> and 'Ok' to add the layer and then close).  Finally clicking the 'X'
>> >> (top right) closes
>> >> the dialog as expected.
>> >>
>> >> - are there other slots to call instead?
>> >> - should the Data Source Manager be used instead [3]?  Are there plans
>> >> for providing
>> >> Python binding to this?
>> >
>> >
>> >
>> > I can't tell if it's a good idea, but you can definitely add whatever
>> > you
>> > want to the DataSourceManager dialog with plain python:
>> >
>> > class ConcreteDataSourceWidget(QgsAbstractDataSourceWidget):
>> >     pass
>> >
>> > class ConcreteSourceSelectProvider(QgsSourceSelectProvider):
>> >
>> >     def providerKey(self):
>> >         return "MyTestProviderKey"
>> >
>> >     def text(self):
>> >         return "MyTestProviderText"
>> >
>> >     def icon(self):
>> >         return QIcon()
>> >
>> >     def createDataSourceWidget(self):
>> >         return ConcreteDataSourceWidget()
>> >
>> >     def ordering(self):
>> >         return 1
>> >
>> > registry = QgsSourceSelectProviderRegistry()
>> > registry.addProvider(ConcreteSourceSelectProvider())
>> >
>> > Note that the DataSourceManager dialog is created when QGIS starts, you
>> > will
>> > want to register your provider early in the startup process, for now,
>> > there
>> > is no way to refresh the dialog after it has been constructed.
>> >
>>
>> Thanks Alessandro.  Is this example to add a provider type?  MetaSearch
>> simply wants to open a given existing provider dialog, open based on a
>> given
>> provider type and let the user interact from there.
>>
>> ..Tom
>
>
>
> Yes, that's the way to add a new "provider" (it does not really need to be a
> provider) to the items in the data source manager dialog.
>
> Maybe you wanted to use this:
> http://qgis.org/api/classQgsDataSourceManagerDialog.html#a6b9046d38467a13ec321a70166bff289
>

Thanks Alessandro.  Is QgsDataSourceManagerDialog planned to be
available via Python?  See:

http://qgis.org/api/classQgsDataSourceManagerDialog.html (docs say not
available in Python
bindings)


> Btw you can also get the individual source selects from provider registry:
> QgsProviderRegistry.instance().createSelectionWidget('ogr').show()
>

This is exactly what MetaSearch is doing currently which results in the
issues originally mentioned.

..Tom

>
>
> Cheers.
>
>>
>> >
>> >
>> >
>> >>
>> >>
>> >> Thanks
>> >>
>> >> ..Tom
>> >>
>> >> [1]
>> >>
>> >> https://github.com/qgis/QGIS/blob/master/python/plugins/MetaSearch/dialogs/maindialog.py#L759-L792
>> >> [2]
>> >> https://gist.github.com/tomkralidis/dccb49efa760a585be38ee0c3188b8b3
>> >> [3] http://qgis.org/api/classQgsDataSourceManagerDialog.html
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>> >
>> >
>> >
>> >
>> > --
>> > Alessandro Pasotti
>> > w3:   www.itopen.it
>
>
>
>
> --
> Alessandro Pasotti
> w3:   www.itopen.it