mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-26 00:02:08 -05:00
90910b0447
In C++ we do not support QgsProviderMetadata(key, description, createFunc) anymore, but for python code we can have a patched class that still supports createFunc. Why not keep the variant with createFunc in C++ as well? Because... SIP! With newly added virtual methods in QgsProviderMetadata, SIP started to generate a sip-specific subclass to handle derived classes in Python, however due to the variant with PyObject* and custom MethodCode it was getting confused about what constructors are available in C++ and failing to compile.
41 lines
1.8 KiB
Python
41 lines
1.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
providermetadata.py
|
|
---------------------
|
|
Date : June 2019
|
|
Copyright : (C) 2019 by Martin Dobias
|
|
Email : wonder dot sk at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
from qgis._core import QgsProviderMetadata
|
|
|
|
|
|
class PyProviderMetadata(QgsProviderMetadata):
|
|
""" wrapper around QgsProviderMetadata to keep the existing Python code running which registers
|
|
data providers by passing a custom python createProvider() function to QgsProviderMetadata
|
|
constructor. The proper new way of doing it is to subclass QgsProviderMetadata and implement
|
|
its virtual functions.
|
|
|
|
TODO: QGIS 4 - remove this wrapper (only subclassing of QgsProviderMetadata should be used)
|
|
"""
|
|
|
|
# this is a workaround to keep references to metadata classes
|
|
# so they are not removed when the variable gets out of scope
|
|
_kept_refs = []
|
|
|
|
def __init__(self, key, description, library_or_create_func=None):
|
|
super().__init__(key, description)
|
|
if callable(library_or_create_func):
|
|
self.createProvider = library_or_create_func
|
|
PyProviderMetadata._kept_refs.append(self)
|