QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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qgslayermetadataresultsmodel.cpp
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1/***************************************************************************
2 qgslayermetadataresultsmodel.cpp - QgsLayerMetadataResultsModel
3
4 ---------------------
5 begin : 1.9.2022
6 copyright : (C) 2022 by ale
7 email : [your-email-here]
8 ***************************************************************************
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 ***************************************************************************/
16#include "qgslayermetadataresultsmodel.h"
17#include "qgsfeedback.h"
18#include "qgsapplication.h"
19#include "qgslayermetadataproviderregistry.h"
20#include "qgslayermetadataformatter.h"
21#include "qgsiconutils.h"
22#include "qgsproviderregistry.h"
23#include "qgsprovidermetadata.h"
24#include <QIcon>
25
26QgsLayerMetadataResultsModel::QgsLayerMetadataResultsModel( const QgsMetadataSearchContext &searchContext, QObject *parent )
27 : QAbstractTableModel( parent )
28 , mSearchContext( searchContext )
29{
30 qRegisterMetaType< QgsLayerMetadataSearchResults>( "QgsLayerMetadataSearchResults" );
31 qRegisterMetaType< QgsLayerMetadataProviderResult>( "QgsLayerMetadataProviderResult" );
32}
33
34QgsLayerMetadataResultsModel::~QgsLayerMetadataResultsModel()
35{
36 cancel();
37}
38
39int QgsLayerMetadataResultsModel::rowCount( const QModelIndex &parent ) const
40{
41 return parent.isValid() ? 0 : mResult.metadata().count();
42}
43
44int QgsLayerMetadataResultsModel::columnCount( const QModelIndex &parent ) const
45{
46 return parent.isValid() ? 0 : 5;
47}
48
49QVariant QgsLayerMetadataResultsModel::data( const QModelIndex &index, int role ) const
50{
51 if ( index.isValid() && index.row() < mResult.metadata().count( ) )
52 {
53 switch ( role )
54 {
55 case Qt::ItemDataRole::DisplayRole:
56 {
57 switch ( index.column() )
58 {
59 case Sections::Identifier:
60 return mResult.metadata().at( index.row() ).identifier( );
61 case Sections::Title:
62 return mResult.metadata().at( index.row() ).title();
63 case Sections::Abstract:
64 return mResult.metadata().at( index.row() ).abstract();
65 case Sections::DataProviderName:
66 {
67 const QString providerName { mResult.metadata().at( index.row() ).dataProviderName() };
68 QgsProviderMetadata *md { QgsProviderRegistry::instance()->providerMetadata( providerName ) };
69 return md ? md->description() : providerName;
70 }
71 case Sections::GeometryType:
72 {
73 const QList<QgsLayerMetadataProviderResult> metadata = mResult.metadata();
74 const QgsLayerMetadataProviderResult &md { metadata.at( index.row() ) };
75 if ( md.layerType() == Qgis::LayerType::Raster )
76 return tr( "Raster" );
77 return md.geometryType() == Qgis::GeometryType::Unknown ? QgsWkbTypes::geometryDisplayString( Qgis::GeometryType::Null ) : QgsWkbTypes::geometryDisplayString( md.geometryType() );
78 }
79 default:
80 return QVariant();
81 }
82 break;
83 }
84 case Qt::ItemDataRole::ToolTipRole:
85 {
86 const QgsLayerMetadataFormatter formatter { mResult.metadata().at( index.row() ) };
87 return tr( R"HTML(<html><body><!-- metadata headers ---><h3>Identification</h3>%1</body></html>)HTML" )
88 .arg(
89 formatter.identificationSectionHtml() );
90 break;
91 }
92 case Qt::ItemDataRole::DecorationRole:
93 {
94 if ( index.column() == 0 )
95 {
96 const QList<QgsLayerMetadataProviderResult> metadata = mResult.metadata();
97 const QgsLayerMetadataProviderResult &md { metadata.at( index.row() ) };
98 if ( md.layerType() == Qgis::LayerType::Raster )
99 return QgsApplication::getThemeIcon( QStringLiteral( "mIconRaster.svg" ) );
100 return QgsIconUtils::iconForGeometryType( md.geometryType() == Qgis::GeometryType::Unknown ? Qgis::GeometryType::Null : md.geometryType() );
101 }
102 break;
103 }
104 case static_cast< int >( CustomRole::Metadata ):
105 {
106 return QVariant::fromValue( mResult.metadata().at( index.row() ) );
107 }
108 default:
109 // Ignore
110 break;
111
112 }
113 }
114 return QVariant();
115}
116
117QVariant QgsLayerMetadataResultsModel::headerData( int section, Qt::Orientation orientation, int role ) const
118{
119 if ( orientation == Qt::Orientation::Horizontal && section < columnCount( createIndex( -1, -1 ) ) )
120 {
121 if ( role == Qt::ItemDataRole::DisplayRole )
122 {
123 switch ( section )
124 {
125 case Sections::Identifier:
126 return tr( "Identifier" );
127 case Sections::Title:
128 return tr( "Title" );
129 case Sections::Abstract:
130 return tr( "Abstract" );
131 case Sections::DataProviderName:
132 return tr( "Provider" );
133 case Sections::GeometryType:
134 return tr( "Layer Type" );
135 }
136 }
137 // other roles here ...
138 }
139 return QAbstractTableModel::headerData( section, orientation, role );
140}
141
142void QgsLayerMetadataResultsModel::reload()
143{
144 cancel();
145 beginResetModel();
146 // Load results from layer metadata providers
147 mResult = QgsLayerMetadataSearchResults();
148 const QList<QgsAbstractLayerMetadataProvider *> providers { QgsApplication::instance()->layerMetadataProviderRegistry()->layerMetadataProviders() };
149 for ( QgsAbstractLayerMetadataProvider *mdProvider : std::as_const( providers ) )
150 {
151 const QList<QgsLayerMetadataProviderResult> results { mdProvider->search( mSearchContext ).metadata() };
152 for ( const QgsLayerMetadataProviderResult &metadata : std::as_const( results ) )
153 {
154 mResult.addMetadata( metadata );
155 }
156 }
157 endResetModel();
158}
159
160void QgsLayerMetadataResultsModel::reloadAsync()
161{
162 cancel();
163 beginResetModel();
164 // Load results from layer metadata providers
165 mResult = QgsLayerMetadataSearchResults();
166 endResetModel();
167 mFeedback->setProgress( 0 );
168 const QList<QgsAbstractLayerMetadataProvider *> providers { QgsApplication::instance()->layerMetadataProviderRegistry()->layerMetadataProviders() };
169 for ( QgsAbstractLayerMetadataProvider *mdProvider : std::as_const( providers ) )
170 {
171 std::unique_ptr<QgsMetadataResultsFetcher> fetcher = std::make_unique<QgsMetadataResultsFetcher>( mdProvider, mSearchContext, mFeedback.get() );
172 std::unique_ptr<QThread> thread = std::make_unique<QThread>();
173 fetcher->moveToThread( thread.get() );
174 // Forward signals to the model
175 connect( fetcher.get(), &QgsMetadataResultsFetcher::resultsReady, this, [ = ]( const QgsLayerMetadataSearchResults & results )
176 {
177 resultsReady( results );
178 } );
179 connect( thread.get(), &QThread::started, fetcher.get(), &QgsMetadataResultsFetcher::fetchMetadata );
180 mWorkerThreads.push_back( std::move( thread ) );
181 mWorkers.push_back( std::move( fetcher ) );
182 mWorkerThreads.back()->start();
183 }
184}
185
186void QgsLayerMetadataResultsModel::resultsReady( const QgsLayerMetadataSearchResults &results )
187{
188 mFeedback->setProgress( mFeedback->progress() + 100 / QgsApplication::instance()->layerMetadataProviderRegistry()->layerMetadataProviders().count() );
189 beginInsertRows( QModelIndex(), mResult.metadata().count(), mResult.metadata().count() + results.metadata().count() - 1 );
190 const QList<QgsLayerMetadataProviderResult> metadata { results.metadata() };
191 for ( const QgsLayerMetadataProviderResult &result : std::as_const( metadata ) )
192 {
193 mResult.addMetadata( result );
194 }
195 endInsertRows();
196}
197
198void QgsLayerMetadataResultsModel::cancel()
199{
200 if ( mFeedback )
201 {
202 mFeedback->cancel();
203 }
204
205 for ( const auto &workerThread : std::as_const( mWorkerThreads ) )
206 {
207 workerThread->quit();
208 workerThread->wait();
209 }
210
211 mWorkers.clear();
212 mWorkerThreads.clear();
213
214 mFeedback = std::make_unique<QgsFeedback>();
215 connect( mFeedback.get(), &QgsFeedback::progressChanged, this, &QgsLayerMetadataResultsModel::progressChanged );
216}
217
218
220
221QgsMetadataResultsFetcher::QgsMetadataResultsFetcher( const QgsAbstractLayerMetadataProvider *metadataProvider, const QgsMetadataSearchContext &searchContext, QgsFeedback *feedback )
222 : mLayerMetadataProvider( metadataProvider )
223 , mSearchContext( searchContext )
224 , mFeedback( feedback )
225{
226}
227
228void QgsMetadataResultsFetcher::fetchMetadata()
229{
230 emit resultsReady( mLayerMetadataProvider->search( mSearchContext, QString(), QgsRectangle(), mFeedback ) );
231}
232
Qgis::GeometryType::Unknown
@ Unknown
Unknown types.
Qgis::GeometryType::Null
@ Null
No geometry.
Qgis::LayerType::Raster
@ Raster
Raster layer.
QgsAbstractLayerMetadataProvider
Layer metadata provider backend interface.
Definition qgsabstractlayermetadataprovider.h:215
QgsApplication::layerMetadataProviderRegistry
static QgsLayerMetadataProviderRegistry * layerMetadataProviderRegistry()
Returns registry of available layer metadata provider implementations.
Definition qgsapplication.cpp:2624
QgsApplication::instance
static QgsApplication * instance()
Returns the singleton instance of the QgsApplication.
Definition qgsapplication.cpp:580
QgsApplication::getThemeIcon
static QIcon getThemeIcon(const QString &name, const QColor &fillColor=QColor(), const QColor &strokeColor=QColor())
Helper to get a theme icon.
Definition qgsapplication.cpp:795
QgsFeedback
Base class for feedback objects to be used for cancellation of something running in a worker thread.
Definition qgsfeedback.h:44
QgsFeedback::progressChanged
void progressChanged(double progress)
Emitted when the feedback object reports a progress change.
QgsIconUtils::iconForGeometryType
static QIcon iconForGeometryType(Qgis::GeometryType typeGroup)
Returns the icon for a vector layer whose geometry typeGroup is provided.
Definition qgsiconutils.cpp:31
QgsLayerMetadataFormatter
Class for metadata formatter.
Definition qgslayermetadataformatter.h:33
QgsLayerMetadataProviderRegistry::layerMetadataProviders
QList< QgsAbstractLayerMetadataProvider * > layerMetadataProviders() const
Returns the list of all registered layer metadata providers.
Definition qgslayermetadataproviderregistry.cpp:36
QgsLayerMetadataProviderResult
Result record of layer metadata provider search.
Definition qgsabstractlayermetadataprovider.h:60
QgsLayerMetadataSearchResults
Container of result records from a layer metadata search.
Definition qgsabstractlayermetadataprovider.h:174
QgsLayerMetadataSearchResults::metadata
QList< QgsLayerMetadataProviderResult > metadata() const
Returns the list of metadata results.
Definition qgsabstractlayermetadataprovider.cpp:21
QgsProviderMetadata
Holds data provider key, description, and associated shared library file or function pointer informat...
Definition qgsprovidermetadata.h:177
QgsProviderMetadata::description
QString description() const
This returns descriptive text for the provider.
Definition qgsprovidermetadata.cpp:50
QgsProviderRegistry::instance
static QgsProviderRegistry * instance(const QString &pluginPath=QString())
Means of accessing canonical single instance.
Definition qgsproviderregistry.cpp:83
QgsProviderRegistry::providerMetadata
QgsProviderMetadata * providerMetadata(const QString &providerKey) const
Returns metadata of the provider or nullptr if not found.
Definition qgsproviderregistry.cpp:1016
QgsRectangle
A rectangle specified with double values.
Definition qgsrectangle.h:42
QgsWkbTypes
Handles storage of information regarding WKB types and their properties.
Definition qgswkbtypes.h:42
QgsWkbTypes::geometryDisplayString
static QString geometryDisplayString(Qgis::GeometryType type)
Returns a display string for a geometry type.
Definition qgswkbtypes.cpp:241
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