QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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qgsalgorithmannotations.cpp
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1/***************************************************************************
2 qgsalgorithmannotations.cpp
3 ------------------------------
4 begin : September 2021
5 copyright : (C) 2021 by Nyall Dawson
6 email : nyall dot dawson at gmail dot com
7 ***************************************************************************/
8
9/***************************************************************************
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 ***************************************************************************/
17
19#include "qgsannotationlayer.h"
20
22
23QString QgsTransferAnnotationsFromMainAlgorithm::name() const
24{
25 return QStringLiteral( "transferannotationsfrommain" );
26}
27
28QString QgsTransferAnnotationsFromMainAlgorithm::displayName() const
29{
30 return QObject::tr( "Transfer annotations from main layer" );
31}
32
33QStringList QgsTransferAnnotationsFromMainAlgorithm::tags() const
34{
35 return QObject::tr( "annotations,drawing,cosmetic,objects" ).split( ',' );
36}
37
38QString QgsTransferAnnotationsFromMainAlgorithm::group() const
39{
40 return QObject::tr( "Cartography" );
41}
42
43QString QgsTransferAnnotationsFromMainAlgorithm::groupId() const
44{
45 return QStringLiteral( "cartography" );
46}
47
48Qgis::ProcessingAlgorithmFlags QgsTransferAnnotationsFromMainAlgorithm::flags() const
49{
51}
52
53QString QgsTransferAnnotationsFromMainAlgorithm::shortHelpString() const
54{
55 return QObject::tr( "Transfer all annotations from the main annotation layer in a project to a new annotation layer." );
56}
57
58QgsTransferAnnotationsFromMainAlgorithm *QgsTransferAnnotationsFromMainAlgorithm::createInstance() const
59{
60 return new QgsTransferAnnotationsFromMainAlgorithm();
61}
62
63void QgsTransferAnnotationsFromMainAlgorithm::initAlgorithm( const QVariantMap & )
64{
65 addParameter( new QgsProcessingParameterString( QStringLiteral( "LAYER_NAME" ), QObject::tr( "New layer name" ), QObject::tr( "Annotations" ) ) );
66
67 addOutput( new QgsProcessingOutputMapLayer( QStringLiteral( "OUTPUT" ), QObject::tr( "New annotation layer" ) ) );
68}
69
70QVariantMap QgsTransferAnnotationsFromMainAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
71{
72 if ( !context.project() )
73 throw QgsProcessingException( QObject::tr( "No project available." ) );
74
76 if ( !main )
77 throw QgsProcessingException( QObject::tr( "Could not load main annotation layer for project." ) );
78
79 std::unique_ptr< QgsAnnotationLayer > newLayer( main->clone() );
80 newLayer->setName( parameterAsString( parameters, QStringLiteral( "LAYER_NAME" ), context ) );
81 main->clear();
82
83 QVariantMap outputs;
84 outputs.insert( QStringLiteral( "OUTPUT" ), newLayer->id() );
85
86 context.project()->addMapLayer( newLayer.release() );
87
88 return outputs;
89}
90
QFlags< ProcessingAlgorithmFlag > ProcessingAlgorithmFlags
Flags indicating how and when an algorithm operates and should be exposed to users.
Definition qgis.h:3339
@ NoThreading
Algorithm is not thread safe and cannot be run in a background thread, e.g. for algorithms which mani...
@ RequiresProject
The algorithm requires that a valid QgsProject is available from the processing context in order to e...
Represents a map layer containing a set of georeferenced annotations, e.g.
virtual Qgis::ProcessingAlgorithmFlags flags() const
Returns the flags indicating how and when the algorithm operates and should be exposed to users.
Contains information about the context in which a processing algorithm is executed.
QgsProject * project() const
Returns the project in which the algorithm is being executed.
Custom exception class for processing related exceptions.
Base class for providing feedback from a processing algorithm.
A map layer output for processing algorithms, where layers may be either vector or raster.
A string parameter for processing algorithms.
QgsAnnotationLayer * mainAnnotationLayer()
Returns the main annotation layer associated with the project.
QgsMapLayer * addMapLayer(QgsMapLayer *mapLayer, bool addToLegend=true, bool takeOwnership=true)
Add a layer to the map of loaded layers.
int main(int argc, char *argv[])