Hi Raymond,
what is mean is something like:
class TestProvider():
def __init__(...):
...
self.mMyAlgorithms=[]
def addAlgorithm(a):
super().addAlgorithm(a)
self.mMyAlgorithms.append(a) # <-- keep a python reference
self.algorithmsLoaded.emit() # <-- required to inform others,
e.g. the model builder
With the python reference the TestAlgorithm instance should stay alive
as long as the TestProvider exists.
Note that each time self.algorithmsLoaded.emit() other models, e.g. the
QgsProcessingToolboxProxyModel, might want to reload all algorithms from
all providers.
If your provider is used to add or remove multiple algorithms more
frequently, it is good to emit algorithmsLoaded only once after all
algorithms have been added/removed.
Greetings,
Benjamin
On 2022-05-13 11:48, Raymond Nijssen via QGIS-Developer wrote:
Hi Benjamin, thanks for your reply.
I'm not sure how the provider should "save a reference on my
algorithm". What do you mean?
Some things I tried:
self.provider = TestProvider()
QgsApplication.processingRegistry().addProvider(self.provider)
alg2 = TestAlgorithm2()
alg2.setProvider(self.provider) # Maybe this is "setting a reference??
self.provider.addAlgorithm(alg2)
# Now the provider shows the extra algorithms (but not in the GUI)
print(self.provider.algorithms())
# Attempts to get it in the GUI:
self.provider.refreshAlgorithms()
self.provider.loadAlgorithms()
self.provider.load()
Still no luck!
Regards,
Raymond
On 13-05-2022 09:07, Benjamin Jakimow wrote:
Hi Raymond,
you need to ensure that your provider saves a python reference on your
TestAlgorithm2() (which you probably already do).
After its set of algorithms has changed (i.e. refresh, addAlgorithm(s)
etc.) it needs to emit the algorithmsLoaded signal.
Greetings,
Benjamin
On 2022-05-13 08:15, Raymond Nijssen via QGIS-Developer wrote:
Is there a way to add a processing algorithm to an existing provider
using pyqgis?
I have 2 plugins and don't know if they are both installed (or which
one will load first). The both contain processing algorithms and I
want those to end up in the same group.
Documentation is a bit brief on this:
QgsProcessingProvider
Examples show to put the addAlgorithm() function(s) in the
loadAlgorithms() function. Then calling
QgsApplication.processingRegistry().addProvider(provider)
adds the group (=provider?) and the algorithms are in it.
What I want to do is finding the provider if it exists already:
self.provider =
QgsApplication.processingRegistry().providerById('test')
if self.provider is None:
self.provider = RayProvider()
and then:
self.provider.addAlgorithm(TestAlgorithm2())
This doesn't work, neither when doing:
provider.refreshAlgorithms()
provider.load()
provider.loadAlgorithms()
...
I'm currently trial-and-errorring my way through this, but I hope
someone has a hint. Even someone pointing at 2 plugins working like
this would be very welcome!
Kind regards,
Raymond
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--
--
Benjamin Jakimow, Doctoral Researcher
Earth Observation Lab | Geography Department | Humboldt-Universität zu
Berlin
e-mail: [email protected]
phone: +49 (0) 30 2093 6894
mobile: +49 (0) 157 5656 8477
fax: +49 (0) 30 2093 6848
mail: Unter den Linden 6 | 10099 Berlin | Germany
room: 2'222
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