Recursive fix

Author: pblottiere

python/core/symbology/qgsrulebasedrenderer.sip.in

@@ -324,7 +324,7 @@ Returns which legend keys match the feature
 .. versionadded:: 2.14
 %End
 
-        QgsRuleBasedRenderer::RuleList rulesForFeature( QgsFeature &feat, QgsRenderContext *context = 0, bool withElse = true, bool onlyActive = true );
+        QgsRuleBasedRenderer::RuleList rulesForFeature( QgsFeature &feat, QgsRenderContext *context = 0, bool onlyActive = true );
 %Docstring
 tell which rules will be used to render the feature
 %End

src/core/symbology/qgsrulebasedrenderer.cpp

@@ -541,13 +541,24 @@ bool QgsRuleBasedRenderer::Rule::willRenderFeature( QgsFeature &feat, QgsRenderC
 {
   if ( !isFilterOK( feat, context ) )
     return false;
+
   if ( mSymbol )
     return true;
 
   Q_FOREACH ( Rule *rule, mActiveChildren )
   {
-    if ( rule->willRenderFeature( feat, context ) )
+    if ( rule->isElse() )
+    {
+      RuleList lst = rulesForFeature( feat, context, false );
+      lst.removeOne( rule );
+
+      if ( lst.empty() )
+        return true;
+    }
+    else if ( !rule->isElse( ) && rule->willRenderFeature( feat, context ) )
+    {
       return true;
+    }
   }
   return false;
 }
@@ -581,7 +592,7 @@ QSet<QString> QgsRuleBasedRenderer::Rule::legendKeysForFeature( QgsFeature &feat
   return lst;
 }
 
-QgsRuleBasedRenderer::RuleList QgsRuleBasedRenderer::Rule::rulesForFeature( QgsFeature &feat, QgsRenderContext *context, bool withElse, bool onlyActive )
+QgsRuleBasedRenderer::RuleList QgsRuleBasedRenderer::Rule::rulesForFeature( QgsFeature &feat, QgsRenderContext *context, bool onlyActive )
 {
   RuleList lst;
   if ( !isFilterOK( feat, context ) )
@@ -596,10 +607,7 @@ QgsRuleBasedRenderer::RuleList QgsRuleBasedRenderer::Rule::rulesForFeature( QgsF
 
   Q_FOREACH ( Rule *rule, listChildren )
   {
-    if ( rule->isElse() && !withElse )
-      continue;
-
-    lst += rule->rulesForFeature( feat, context, withElse, onlyActive );
+    lst += rule->rulesForFeature( feat, context, onlyActive );
   }
   return lst;
 }
@@ -1148,24 +1156,7 @@ QString QgsRuleBasedRenderer::dump() const
 
 bool QgsRuleBasedRenderer::willRenderFeature( QgsFeature &feat, QgsRenderContext &context )
 {
-  for ( Rule *rule : mRootRule->children() )
-  {
-    if ( ! rule->active() )
-      continue;
-
-    // a feature already rendered by another rule shouldn't be considered in a
-    // 'else' statement for rendering
-    if ( rule->isElse() && mRootRule->rulesForFeature( feat, &context, false, false ).empty() )
-    {
-      return true;
-    }
-    else if ( !rule->isElse( ) && rule->willRenderFeature( feat, &context ) )
-    {
-      return true;
-    }
-  }
-
-  return false;
+  return mRootRule->willRenderFeature( feat, &context );
 }
 
 QgsSymbolList QgsRuleBasedRenderer::symbolsForFeature( QgsFeature &feat, QgsRenderContext &context )

src/core/symbology/qgsrulebasedrenderer.h

@@ -343,7 +343,7 @@ class CORE_EXPORT QgsRuleBasedRenderer : public QgsFeatureRenderer
         QSet< QString > legendKeysForFeature( QgsFeature &feat, QgsRenderContext *context = nullptr );
 
         //! tell which rules will be used to render the feature
-        QgsRuleBasedRenderer::RuleList rulesForFeature( QgsFeature &feat, QgsRenderContext *context = nullptr, bool withElse = true, bool onlyActive = true );
+        QgsRuleBasedRenderer::RuleList rulesForFeature( QgsFeature &feat, QgsRenderContext *context = nullptr, bool onlyActive = true );
 
         /**
          * Stop a rendering process. Used to clean up the internal state of this rule

tests/src/python/test_qgsrulebasedrenderer.py

@@ -115,12 +115,14 @@ def testWillRenderFeature(self):
         renderer.rootRule().children()[2].setActive(True)
 
         renderer.startRender(ctx, vl.fields()) # build mActiveChlidren
-
         rendered = renderer.willRenderFeature(ft, ctx)
+        renderer.stopRender(ctx)
         renderer.rootRule().children()[0].setActive(True)
         assert rendered == False
 
+        renderer.startRender(ctx, vl.fields()) # build mActiveChlidren
         rendered = renderer.willRenderFeature(ft, ctx)
+        renderer.stopRender(ctx)
         assert rendered == True
 
     def testRefineWithCategories(self):