More misc porting to expression contexts

nyalldawson · nyalldawson · commit cc6feae8355c · 2015-08-22T19:01:41.000+10:00
diff --git a/src/app/qgsattributetabledialog.cpp b/src/app/qgsattributetabledialog.cpp
@@ -365,6 +365,11 @@ void QgsAttributeTableDialog::runFieldCalculation( QgsVectorLayer* layer, QStrin
 
   int rownum = 1;
 
+  QgsExpressionContext context;
+  context << QgsExpressionContextUtils::globalScope()
+  << QgsExpressionContextUtils::projectScope()
+  << QgsExpressionContextUtils::layerScope( layer );
+
   QgsField fld = layer->fields()[ fieldindex ];
 
   //go through all the features and change the new attributes
@@ -377,8 +382,10 @@ void QgsAttributeTableDialog::runFieldCalculation( QgsVectorLayer* layer, QStrin
       continue;
     }
 
-    exp.setCurrentRowNumber( rownum );
-    QVariant value = exp.evaluate( &feature );
+    context.setFeature( feature );
+    context.lastScope()->setVariable( QString( "_rownum_" ), rownum );
+
+    QVariant value = exp.evaluate( &context );
     fld.convertCompatible( value );
     // Bail if we have a update error
     if ( exp.hasEvalError() )
@@ -768,7 +775,12 @@ void QgsAttributeTableDialog::setFilterExpression( QString filterString )
     return;
   }
 
-  if ( ! filterExpression.prepare( mLayer->fields() ) )
+  QgsExpressionContext context;
+  context << QgsExpressionContextUtils::globalScope()
+  << QgsExpressionContextUtils::projectScope()
+  << QgsExpressionContextUtils::layerScope( mLayer );
+
+  if ( ! filterExpression.prepare( &context ) )
   {
     QgisApp::instance()->messageBar()->pushMessage( tr( "Evaluation error" ), filterExpression.evalErrorString(), QgsMessageBar::WARNING, QgisApp::instance()->messageTimeout() );
   }
@@ -790,7 +802,8 @@ void QgsAttributeTableDialog::setFilterExpression( QString filterString )
 
   while ( featIt.nextFeature( f ) )
   {
-    if ( filterExpression.evaluate( &f ).toInt() != 0 )
+    context.setFeature( f );
+    if ( filterExpression.evaluate( &context ).toInt() != 0 )
       filteredFeatures << f.id();
 
     // check if there were errors during evaluating
diff --git a/src/app/qgslabelpropertydialog.cpp b/src/app/qgslabelpropertydialog.cpp
@@ -204,6 +204,13 @@ void QgsLabelPropertyDialog::setDataDefinedValues( const QgsPalLayerSettings &la
   //loop through data defined properties and set all the GUI widget values. We can do this
   //even if the data defined property is set to an expression, as it's useful to show
   //users what the evaluated property is...
+
+  QgsExpressionContext context;
+  context << QgsExpressionContextUtils::globalScope()
+  << QgsExpressionContextUtils::projectScope()
+  << QgsExpressionContextUtils::layerScope( vlayer );
+  context.setFeature( mCurLabelFeat );
+
   QMap< QgsPalLayerSettings::DataDefinedProperties, QgsDataDefined* >::const_iterator propIt = mDataDefinedProperties.constBegin();
   for ( ; propIt != mDataDefinedProperties.constEnd(); ++propIt )
   {
@@ -215,11 +222,11 @@ void QgsLabelPropertyDialog::setDataDefinedValues( const QgsPalLayerSettings &la
 
     if ( !dd->expressionIsPrepared() )
     {
-      dd->prepareExpression( vlayer );
+      dd->prepareExpression( context );
     }
 
     //TODO - pass expression context
-    QVariant result = layerSettings.dataDefinedValue( propIt.key(), mCurLabelFeat, vlayer->fields() );
+    QVariant result = layerSettings.dataDefinedValue( propIt.key(), mCurLabelFeat, vlayer->fields(), &context );
     if ( !result.isValid() || result.isNull() )
     {
       //could not evaluate data defined value
diff --git a/src/gui/qgshtmlannotationitem.cpp b/src/gui/qgshtmlannotationitem.cpp
@@ -218,7 +218,12 @@ void QgsHtmlAnnotationItem::setFeatureForMapPosition()
   mFeatureId = currentFeatureId;
   mFeature = currentFeature;
 
-  QString newtext = QgsExpression::replaceExpressionText( mHtmlSource, &mFeature, vectorLayer() );
+  QgsExpressionContext context;
+  context << QgsExpressionContextUtils::globalScope()
+  << QgsExpressionContextUtils::projectScope()
+  << QgsExpressionContextUtils::layerScope( mVectorLayer );
+  context.setFeature( mFeature );
+  QString newtext = QgsExpression::replaceExpressionText( mHtmlSource, &context );
   mWebView->setHtml( newtext );
 }
 
diff --git a/src/gui/qgsmaptip.cpp b/src/gui/qgsmaptip.cpp
@@ -96,7 +96,14 @@ QString QgsMapTip::fetchFeature( QgsMapLayer *layer, QgsPoint &mapPosition, QgsM
 
   int idx = vlayer->fieldNameIndex( vlayer->displayField() );
   if ( idx < 0 )
-    return QgsExpression::replaceExpressionText( vlayer->displayField(), &feature, vlayer );
+  {
+    QgsExpressionContext context;
+    context << QgsExpressionContextUtils::globalScope()
+    << QgsExpressionContextUtils::projectScope()
+    << QgsExpressionContextUtils::layerScope( vlayer );
+    context.setFeature( feature );
+    return QgsExpression::replaceExpressionText( vlayer->displayField(), &context );
+  }
   else
     return feature.attribute( idx ).toString();
 }
