Merge pull request #8125 from elpaso/bugfix-20020-paste-geometry-collapsed-features

Show a warning when pasted feature geometry collapsed

Author: elpaso

src/app/qgisapp.cpp

@@ -8634,69 +8634,36 @@ void QgisApp::pasteFromClipboard( QgsMapLayer *destinationLayer )
   pasteVectorLayer->beginEditCommand( tr( "Features pasted" ) );
   QgsFeatureList features = clipboard()->transformedCopyOf( pasteVectorLayer->crs(), pasteVectorLayer->fields() );
   int nTotalFeatures = features.count();
-
-  QHash<int, int> remap;
-  QgsFields fields = clipboard()->fields();
-  for ( int idx = 0; idx < fields.count(); ++idx )
-  {
-    int dst = pasteVectorLayer->fields().lookupField( fields.at( idx ).name() );
-    if ( dst < 0 )
-      continue;
-
-    remap.insert( idx, dst );
-  }
-
   QgsExpressionContext context = pasteVectorLayer->createExpressionContext();
 
-
+  QgsFeatureList compatibleFeatures( QgsVectorLayerUtils::makeFeaturesCompatible( features, pasteVectorLayer ) );
   QgsFeatureList newFeatures;
-  QgsFeatureList::const_iterator featureIt = features.constBegin();
-  while ( featureIt != features.constEnd() )
-  {
-    QgsAttributes srcAttr = featureIt->attributes();
-    QgsAttributeMap dstAttr;
+  // Count collapsed geometries
+  int invalidGeometriesCount = 0;
 
-    for ( int src = 0; src < srcAttr.count(); ++src )
-    {
-      int dst = remap.value( src, -1 );
-      if ( dst < 0 )
-        continue;
+  for ( const auto &feature : qgis::as_const( compatibleFeatures ) )
+  {
 
-      dstAttr[ dst ] = srcAttr.at( src );
-    }
+    QgsGeometry geom = feature.geometry();
 
-    QgsGeometry geom = featureIt->geometry();
-    if ( featureIt->hasGeometry() )
+    if ( !( geom.isEmpty() || geom.isNull( ) ) )
     {
-      // convert geometry to match destination layer
-      QgsWkbTypes::GeometryType destType = pasteVectorLayer->geometryType();
-      bool destIsMulti = QgsWkbTypes::isMultiType( pasteVectorLayer->wkbType() );
-      if ( pasteVectorLayer->dataProvider() &&
-           !pasteVectorLayer->dataProvider()->doesStrictFeatureTypeCheck() )
-      {
-        // force destination to multi if provider doesn't do a feature strict check
-        destIsMulti = true;
-      }
-
-      if ( destType != QgsWkbTypes::UnknownGeometry )
-      {
-        QgsGeometry newGeometry = geom.convertToType( destType, destIsMulti );
-        if ( newGeometry.isNull() )
-        {
-          continue;
-        }
-        geom = newGeometry;
-      }
       // avoid intersection if enabled in digitize settings
       geom.avoidIntersections( QgsProject::instance()->avoidIntersectionsLayers() );
+      // Count collapsed geometries
+      if ( geom.isEmpty() || geom.isNull( ) )
+        invalidGeometriesCount++;
     }
 
+    QgsAttributeMap attrMap;
+    for ( int i = 0; i < feature.fields().count(); i++ )
+    {
+      attrMap[i] = feature.attribute( i );
+    }
     // now create new feature using pasted feature as a template. This automatically handles default
     // values and field constraints
-    newFeatures << QgsVectorLayerUtils::createFeature( pasteVectorLayer, geom, dstAttr, &context );
-    ++featureIt;
+    newFeatures << QgsVectorLayerUtils::createFeature( pasteVectorLayer, geom, attrMap, &context );
   }
-
   pasteVectorLayer->addFeatures( newFeatures );
   QgsFeatureIds newIds;
   for ( const QgsFeature &f : qgis::as_const( newFeatures ) )
@@ -8710,26 +8677,31 @@ void QgisApp::pasteFromClipboard( QgsMapLayer *destinationLayer )
   pasteVectorLayer->updateExtents();
 
   int nCopiedFeatures = features.count();
+  Qgis::MessageLevel level = ( nCopiedFeatures == 0 || nCopiedFeatures < nTotalFeatures || invalidGeometriesCount > 0 ) ? Qgis::Warning : Qgis::Info;
+  QString message;
   if ( nCopiedFeatures == 0 )
   {
-    messageBar()->pushMessage( tr( "Paste features" ),
-                               tr( "no features could be successfully pasted." ),
-                               Qgis::Warning, messageTimeout() );
-
+    message = tr( "No features could be successfully pasted." );
   }
   else if ( nCopiedFeatures == nTotalFeatures )
   {
-    messageBar()->pushMessage( tr( "Paste features" ),
-                               tr( "%1 features were successfully pasted." ).arg( nCopiedFeatures ),
-                               Qgis::Info, messageTimeout() );
+    message = tr( "%1 features were successfully pasted." ).arg( nCopiedFeatures );
   }
   else
   {
-    messageBar()->pushMessage( tr( "Paste features" ),
-                               tr( "%1 of %2 features could be successfully pasted." ).arg( nCopiedFeatures ).arg( nTotalFeatures ),
-                               Qgis::Warning, messageTimeout() );
+    message = tr( "%1 of %2 features could be successfully pasted." ).arg( nCopiedFeatures ).arg( nTotalFeatures );
   }
 
+  // warn the user if the pasted features have invalid geometries
+  if ( invalidGeometriesCount > 0 )
+    message +=  invalidGeometriesCount == 1 ? tr( " Geometry collapsed due to intersection avoidance." ) :
+                tr( "%1 geometries collapsed due to intersection avoidance." )
+                .arg( invalidGeometriesCount );
+
+  messageBar()->pushMessage( tr( "Paste features" ),
+                             message,
+                             level, messageTimeout() );
+
   pasteVectorLayer->triggerRepaint();
 }