GRASS feature id fix, tables selection id fix, fixes #6451

Author: blazek

src/gui/attributetable/qgsattributetabledelegate.cpp

@@ -84,7 +84,7 @@ void QgsAttributeTableDelegate::setModelData( QWidget *editor, QAbstractItemMode
     return;
 
   int fieldIdx = model->data( index, QgsAttributeTableModel::FieldIndexRole ).toInt();
-  QgsFeatureId fid = model->data( index, QgsAttributeTableModel::FeatureIdRole ).toInt();
+  QgsFeatureId fid = model->data( index, QgsAttributeTableModel::FeatureIdRole ).toLongLong();
 
   QVariant value;
   if ( !QgsAttributeEditor::retrieveValue( editor, vl, fieldIdx, value ) )
@@ -114,7 +114,7 @@ void QgsAttributeTableDelegate::paint( QPainter * painter,
                                        const QStyleOptionViewItem & option,
                                        const QModelIndex & index ) const
 {
-  QgsFeatureId fid = index.model()->data( index, QgsAttributeTableModel::FeatureIdRole ).toInt();
+  QgsFeatureId fid = index.model()->data( index, QgsAttributeTableModel::FeatureIdRole ).toLongLong();
 
   QStyleOptionViewItem myOpt = option;
 

src/gui/attributetable/qgsfeatureselectionmodel.cpp

@@ -52,7 +52,7 @@ bool QgsFeatureSelectionModel::isSelected( QgsFeatureId fid )
 
 bool QgsFeatureSelectionModel::isSelected( const QModelIndex &index )
 {
-  return isSelected( index.model()->data( index, QgsAttributeTableModel::FeatureIdRole ).toInt() );
+  return isSelected( index.model()->data( index, QgsAttributeTableModel::FeatureIdRole ).toLongLong() );
 }
 
 void QgsFeatureSelectionModel::selectFeatures( const QItemSelection &selection, QItemSelectionModel::SelectionFlags command )
@@ -61,7 +61,7 @@ void QgsFeatureSelectionModel::selectFeatures( const QItemSelection &selection,
 
   foreach ( const QModelIndex index, selection.indexes() )
   {
-    QgsFeatureId id = index.model()->data( index, QgsAttributeTableModel::FeatureIdRole ).toInt();
+    QgsFeatureId id = index.model()->data( index, QgsAttributeTableModel::FeatureIdRole ).toLongLong();
 
     ids << id;
   }

src/providers/grass/qgsgrassfeatureiterator.cpp

@@ -149,6 +149,7 @@ bool QgsGrassFeatureIterator::nextFeature( QgsFeature& feature )
 
   feature.setValid( false );
   int cat = -1, type = -1, id = -1;
+  QgsFeatureId featureId = -1;
 
   QgsDebugMsgLevel( "entered.", 3 );
 
@@ -172,13 +173,19 @@ bool QgsGrassFeatureIterator::nextFeature( QgsFeature& feature )
   {
     Vect_cidx_get_cat_by_index( P->mMap, P->mCidxFieldIndex, mNextCidx++, &cat, &type, &id );
     // Warning: selection array is only of type line/area of current layer -> check type first
-
-    if ( filterById && id != mRequest.filterFid() )
+    if ( !( type & P->mGrassType ) )
       continue;
 
-    if ( !( type & P->mGrassType ) )
+    // The 'id' is a unique id of a GRASS geometry object (point, line, area)
+    // but it cannot be used as QgsFeatureId because one geometry object may
+    // represent more features because it may have more categories.
+    featureId = makeFeatureId( id, cat );
+
+    if ( filterById && featureId != mRequest.filterFid() )
       continue;
 
+    // it is correct to use id with mSelection because mSelection is only used
+    // for geometry selection
     if ( !mSelection[id] )
       continue;
 
@@ -190,11 +197,9 @@ bool QgsGrassFeatureIterator::nextFeature( QgsFeature& feature )
     close();
     return false; // No more features
   }
-#if QGISDEBUG > 3
-  QgsDebugMsg( QString( "cat = %1 type = %2 id = %3" ).arg( cat ).arg( type ).arg( id ) );
-#endif
+  QgsDebugMsgLevel( QString( "cat = %1 type = %2 id = %3 fatureId = %4" ).arg( cat ).arg( type ).arg( id ).arg( featureId ), 3 );
 
-  feature.setFeatureId( id );
+  feature.setFeatureId( featureId );
   feature.initAttributes( P->fields().count() );
   feature.setFields( &P->fields() ); // allow name-based attribute lookups
 
@@ -395,3 +400,10 @@ void QgsGrassFeatureIterator::setFeatureGeometry( QgsFeature& feature, int id, i
 
   feature.setGeometryAndOwnership( wkb, wkbsize );
 }
+
+QgsFeatureId QgsGrassFeatureIterator::makeFeatureId( int grassId, int cat )
+{
+  // Because GRASS object id and category are both int and QgsFeatureId is qint64
+  // we can create unique QgsFeatureId from GRASS id and cat
+  return ( QgsFeatureId )grassId * 1000000000 + cat;
+}

src/providers/grass/qgsgrassfeatureiterator.h

@@ -39,6 +39,9 @@ class QgsGrassFeatureIterator : public QgsAbstractFeatureIterator
   protected:
     QgsGrassProvider* P;
 
+    // create QgsFeatureId from GRASS geometry object id and cat
+    static QgsFeatureId makeFeatureId( int grassId, int cat );
+
     void setSelectionRect( const QgsRectangle& rect, bool useIntersect );
 
     void setFeatureGeometry( QgsFeature& feature, int id, int type );

src/providers/grass/qgsgrassprovider.h

@@ -520,6 +520,9 @@ class GRASS_LIB_EXPORT QgsGrassProvider : public QgsVectorDataProvider
     bool    mValid;                // !UPDATE!
     long    mNumberFeatures;       // !UPDATE!
 
+    // create QgsFeatureId from GRASS geometry object id and cat
+    static QgsFeatureId makeFeatureId( int grassId, int cat );
+
     // Reopen map after edit or freeze
     bool reopenMap();