Add test case

tests/src/core/testqgslabelingengine.cpp

@@ -123,6 +123,7 @@ class TestQgsLabelingEngine : public QgsTest
     void parallelOverrun();
     void testDataDefinedLabelAllParts();
     void testDataDefinedPlacementPositionPoint();
+    void testDataDefinedLabelTabs();
     void testVerticalOrientation();
     void testVerticalOrientationLetterLineSpacing();
     void testRotationBasedOrientationPoint();
@@ -5185,6 +5186,64 @@ void TestQgsLabelingEngine::testDataDefinedPlacementPositionPoint()
   vl->setLabeling( nullptr );
 }
 
+void TestQgsLabelingEngine::testDataDefinedLabelTabs()
+{
+  // test curved label rendering with tab characters
+  QgsPalLayerSettings settings;
+  setDefaultLabelParams( settings );
+
+  QgsTextFormat format = settings.format();
+  format.setSize( 30 );
+  format.setColor( QColor( 0, 0, 0 ) );
+  format.setTabStopDistance( 28 );
+  format.setTabStopDistanceUnit( Qgis::RenderUnit::Millimeters );
+  settings.setFormat( format );
+  settings.dataDefinedProperties().setProperty( QgsPalLayerSettings::Property::TabStopDistance, QgsProperty::fromExpression( QStringLiteral( "48" ) ) );
+
+  settings.fieldName = QStringLiteral( "'test of\ttab\ttext'" );
+  settings.isExpression = true;
+  settings.placement = Qgis::LabelPlacement::Horizontal;
+  settings.labelPerPart = false;
+  settings.lineSettings().setLineAnchorPercent( 0.5 );
+  settings.lineSettings().setAnchorType( QgsLabelLineSettings::AnchorType::Strict );
+  settings.lineSettings().setPlacementFlags( Qgis::LabelLinePlacementFlag::AboveLine | Qgis::LabelLinePlacementFlag::MapOrientation );
+  settings.lineSettings().setAnchorTextPoint( QgsLabelLineSettings::AnchorTextPoint::CenterOfText );
+
+  std::unique_ptr<QgsVectorLayer> vl2( new QgsVectorLayer( QStringLiteral( "LineString?crs=epsg:3946&field=id:integer" ), QStringLiteral( "vl" ), QStringLiteral( "memory" ) ) );
+  vl2->setRenderer( new QgsNullSymbolRenderer() );
+
+  QgsFeature f;
+  f.setAttributes( QgsAttributes() << 1 );
+  f.setGeometry( QgsGeometry::fromWkt( QStringLiteral( "LineString (190000 5000010, 190100 5000000, 190200 5000000)" ) ) );
+  QVERIFY( vl2->dataProvider()->addFeature( f ) );
+
+  vl2->setLabeling( new QgsVectorLayerSimpleLabeling( settings ) ); // TODO: this should not be necessary!
+  vl2->setLabelsEnabled( true );
+
+  // make a fake render context
+  const QSize size( 640, 480 );
+  QgsMapSettings mapSettings;
+  mapSettings.setLabelingEngineSettings( createLabelEngineSettings() );
+  mapSettings.setDestinationCrs( vl2->crs() );
+
+  mapSettings.setOutputSize( size );
+  mapSettings.setExtent( f.geometry().boundingBox() );
+  mapSettings.setLayers( QList<QgsMapLayer *>() << vl2.get() );
+  mapSettings.setOutputDpi( 96 );
+
+  QgsLabelingEngineSettings engineSettings = mapSettings.labelingEngineSettings();
+  engineSettings.setFlag( Qgis::LabelingFlag::UsePartialCandidates, false );
+  engineSettings.setFlag( Qgis::LabelingFlag::DrawCandidates, true );
+  mapSettings.setLabelingEngineSettings( engineSettings );
+
+  QgsMapRendererSequentialJob job( mapSettings );
+  job.start();
+  job.waitForFinished();
+
+  QImage img = job.renderedImage();
+  QGSVERIFYIMAGECHECK( "data_defined_tabs", "data_defined_tabs", img, QString(), 20, QSize( 0, 0 ), 2 );
+}
+
 void TestQgsLabelingEngine::testVerticalOrientation()
 {
   const QSize size( 640, 480 );