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[processing] Add a model-only "load layer to project" algorithm
This can be used to force loading a layer into the current project. The primary use case here is to load a preset layer as part of a model, but it's also useful for loading results from the 'package layers' algorithm into the project.
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| /*************************************************************************** | ||
| qgsalgorithmloadlayer.cpp | ||
| --------------------- | ||
| begin : November 2017 | ||
| copyright : (C) 2017 by Nyall Dawson | ||
| email : nyall dot dawson at gmail dot com | ||
| ***************************************************************************/ | ||
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| /*************************************************************************** | ||
| * * | ||
| * 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| #include "qgsalgorithmloadlayer.h" | ||
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| ///@cond PRIVATE | ||
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| QString QgsLoadLayerAlgorithm::name() const | ||
| { | ||
| return QStringLiteral( "loadlayer" ); | ||
| } | ||
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| QgsProcessingAlgorithm::Flags QgsLoadLayerAlgorithm::flags() const | ||
| { | ||
| return FlagHideFromToolbox; | ||
| } | ||
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| QString QgsLoadLayerAlgorithm::displayName() const | ||
| { | ||
| return QObject::tr( "Load layer into project" ); | ||
| } | ||
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| QStringList QgsLoadLayerAlgorithm::tags() const | ||
| { | ||
| return QObject::tr( "load,open,layer,raster,vector,project" ).split( ',' ); | ||
| } | ||
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| QString QgsLoadLayerAlgorithm::group() const | ||
| { | ||
| return QObject::tr( "Modeler tool" ); | ||
| } | ||
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| QString QgsLoadLayerAlgorithm::shortHelpString() const | ||
| { | ||
| return QObject::tr( "This algorithm loads a layer to the current project." ); | ||
| } | ||
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| QgsLoadLayerAlgorithm *QgsLoadLayerAlgorithm::createInstance() const | ||
| { | ||
| return new QgsLoadLayerAlgorithm(); | ||
| } | ||
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| void QgsLoadLayerAlgorithm::initAlgorithm( const QVariantMap & ) | ||
| { | ||
| addParameter( new QgsProcessingParameterMapLayer( QStringLiteral( "INPUT" ), QObject::tr( "Layer" ) ) ); | ||
| addParameter( new QgsProcessingParameterString( QStringLiteral( "NAME" ), QObject::tr( "Loaded layer name" ) ) ); | ||
| addOutput( new QgsProcessingOutputMapLayer( QStringLiteral( "OUTPUT" ), QObject::tr( "Layer" ) ) ); | ||
| } | ||
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| QVariantMap QgsLoadLayerAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * ) | ||
| { | ||
| QgsMapLayer *layer = parameterAsLayer( parameters, QStringLiteral( "INPUT" ), context ); | ||
| QString name = parameterAsString( parameters, QStringLiteral( "NAME" ), context ); | ||
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| if ( !layer ) | ||
| throw QgsProcessingException( QObject::tr( "Invalid input layer" ) ); | ||
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| if ( name.isEmpty() ) | ||
| throw QgsProcessingException( QObject::tr( "Invalid (empty) layer name" ) ); | ||
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| layer->setName( name ); | ||
| context.addLayerToLoadOnCompletion( layer->id(), QgsProcessingContext::LayerDetails( name, context.project(), name ) ); | ||
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| QVariantMap results; | ||
| results.insert( QStringLiteral( "OUTPUT" ), layer->id() ); | ||
| return results; | ||
| } | ||
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| ///@endcond |
| @@ -0,0 +1,53 @@ | ||
| /*************************************************************************** | ||
| qgsalgorithmloadlayer.h | ||
| --------------------- | ||
| begin : November 2017 | ||
| copyright : (C) 2017 by Nyall Dawson | ||
| email : nyall dot dawson 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
|
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| #ifndef QGSALGORITHMLOADLAYER_H | ||
| #define QGSALGORITHMLOADLAYER_H | ||
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| #define SIP_NO_FILE | ||
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| #include "qgis.h" | ||
| #include "qgsprocessingalgorithm.h" | ||
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| ///@cond PRIVATE | ||
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| /** | ||
| * Native rename layer algorithm. | ||
| */ | ||
| class QgsLoadLayerAlgorithm : public QgsProcessingAlgorithm | ||
| { | ||
| public: | ||
| QgsLoadLayerAlgorithm() = default; | ||
| void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override; | ||
| Flags flags() const override; | ||
| QString name() const override; | ||
| QString displayName() const override; | ||
| virtual QStringList tags() const override; | ||
| QString group() const override; | ||
| QString shortHelpString() const override; | ||
| QgsLoadLayerAlgorithm *createInstance() const override SIP_FACTORY; | ||
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| protected: | ||
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| virtual QVariantMap processAlgorithm( const QVariantMap ¶meters, | ||
| QgsProcessingContext &context, QgsProcessingFeedback * ) override; | ||
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| }; | ||
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| ///@endcond PRIVATE | ||
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| #endif // QGSALGORITHMLOADLAYER_H |