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42 lines
1.8 KiB
Python
42 lines
1.8 KiB
Python
"""
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***************************************************************************
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providermetadata.py
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---------------------
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Date : June 2019
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Copyright : (C) 2019 by Martin Dobias
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Email : wonder dot sk at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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from qgis._core import QgsProviderMetadata
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class PyProviderMetadata(QgsProviderMetadata):
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"""wrapper around QgsProviderMetadata to keep the existing Python code running which registers
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data providers by passing a custom python createProvider() function to QgsProviderMetadata
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constructor. The proper new way of doing it is to subclass QgsProviderMetadata and implement
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its virtual functions.
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TODO: QGIS 4 - remove this wrapper (only subclassing of QgsProviderMetadata should be used)
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"""
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# this is a workaround to keep references to metadata classes
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# so they are not removed when the variable gets out of scope
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_kept_refs = []
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def __init__(self, key, description, library_or_create_func=None):
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super().__init__(key, description)
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if callable(library_or_create_func):
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self.createProvider = library_or_create_func
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PyProviderMetadata._kept_refs.append(self)
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PyProviderMetadata.__doc__ = QgsProviderMetadata.__doc__
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