[QGIS-Developer] How to access QgisApp::instance() from a core class

[Schmetzer, Tobias]

Hello everyone,


I would like to access QgisApp::instance() (src/app/qgisapp.cpp) from a provider like QgsOgrProvider::extent() (src/core/providers/ogr/qgsogrprovider.cpp.

Yet I cannot include "qgisapp.h" into the provider.


When looking for this information I found some inactivating preprocessor code block comments like this one (qgswfsdataitems.cpp):

#if 0

    // TODO: how to emit message from provider (which does not know about QgisApp)
    QgisApp::instance()->messageBar()->pushMessage( tr( "Cannot copy style" ),
        errorMsg,
        Qgis::MessageLevel::Critical, messageTimeout() );
#endif


Does anybody know what is the idea to access the current QgisApp::instance() from outside the QgisApp realm?


Best regards, Tobias


--

ZAE Bayern
Dipl.-Ing. Tobias Schmetzer
Systementwicklung | Systems Engineering
Bereich Energiespeicherung | Division Energy Storage
Walther-Meißner-Straße 6
85748 Garching

Tel.: +49 89 329442-65
Fax: +49 89 329442-12
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tobias.schmetzer at zae-bayern.de
https://www.zae-bayern.de

ZAE Bayern
Bayerisches Zentrum für Angewandte Energieforschung e. V. | Bavarian Center for Applied Energy Research
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