Histogram drag/drop and paste improvements (#12851)

* Add drag'n'drop support for ensemble summary vectors and ensembles into histogram plots

* Make sure histogram plot is shown and all update signals are connected when loading a project.

* Support ensemble parameter drag'n'drop from data sources into histogram plots. 

* Show ensemble parameters in data sources tree.

* Add copy/paste of histogram curves

* Re-use all existing parameters in a plot when dragging a new ensemble into it

ApplicationLibCode/ProjectDataModel/Histogram/RimEnsembleParameterHistogramDataSource.cpp

@@ -200,6 +200,14 @@ void RimEnsembleParameterHistogramDataSource::setEnsembleParameter( const QStrin
     m_parameter = ensembleParameter;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+QString RimEnsembleParameterHistogramDataSource::ensembleParameter() const
+{
+    return m_parameter;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -208,6 +216,14 @@ void RimEnsembleParameterHistogramDataSource::setEnsemble( RimSummaryEnsemble* e
     m_ensemble = ensemble;
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RimSummaryEnsemble* RimEnsembleParameterHistogramDataSource::ensemble() const
+{
+    return m_ensemble;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/Histogram/RimEnsembleParameterHistogramDataSource.h

@@ -37,8 +37,11 @@ public:
     RimEnsembleParameterHistogramDataSource();
     ~RimEnsembleParameterHistogramDataSource() override;
 
-    void setEnsembleParameter( const QString& ensembleParameter );
-    void setEnsemble( RimSummaryEnsemble* ensemble );
+    void    setEnsembleParameter( const QString& ensembleParameter );
+    QString ensembleParameter() const;
+
+    void                setEnsemble( RimSummaryEnsemble* ensemble );
+    RimSummaryEnsemble* ensemble() const;
 
     std::string unitNameX() const override;
     std::string unitNameY() const override;

ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramCurve.cpp

@@ -77,6 +77,14 @@ RimHistogramCurve::~RimHistogramCurve()
 {
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimHistogramCurve::initAfterRead()
+{
+    setDataSource( m_dataSource );
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -102,6 +110,14 @@ void RimHistogramCurve::setDataSource( RimHistogramDataSource* dataSource )
     }
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RimHistogramDataSource* RimHistogramCurve::dataSource() const
+{
+    return m_dataSource;
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramCurve.h

@@ -60,6 +60,8 @@ public:
     void setDataSource( RimHistogramDataSource* dataSource );
     void setAppearanceFromGraphType( RimHistogramPlot::GraphType graphType );
 
+    RimHistogramDataSource* dataSource() const;
+
 protected:
     // RimPlotCurve overrides
     QString createCurveAutoName() override;
@@ -82,6 +84,8 @@ protected:
 
     void onDataSourceChanged( const caf::SignalEmitter* emitter );
 
+    void initAfterRead() override;
+
 private:
     caf::PdmPtrField<RimPlotAxisPropertiesInterface*> m_yPlotAxisProperties;
     caf::PdmPtrField<RimPlotAxisPropertiesInterface*> m_xPlotAxisProperties;

ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramMultiPlot.cpp

@@ -341,6 +341,8 @@ void RimHistogramMultiPlot::initAfterRead()
         plot->titleChanged.connect( this, &RimHistogramMultiPlot::onSubPlotChanged );
         plot->autoTitleChanged.connect( this, &RimHistogramMultiPlot::onSubPlotAutoTitleChanged );
     }
+
+    loadDataAndUpdate();
 }
 
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramPlot.cpp

@@ -20,11 +20,19 @@
 
 #include "RiaLogging.h"
 #include "RiaPlotDefines.h"
+#include "Summary/RiaSummaryTools.h"
 
+#include "RicHistogramPlotTools.h"
+
+#include "Histogram/RimEnsembleParameterHistogramDataSource.h"
+#include "Histogram/RimEnsembleSummaryVectorHistogramDataSource.h"
 #include "RimHistogramCurve.h"
 #include "RimHistogramCurveCollection.h"
 #include "RimMultiPlot.h"
 #include "RimPlotAxisLogRangeCalculator.h"
+#include "Summary/Ensemble/RimSummaryEnsembleParameter.h"
+#include "Summary/Ensemble/RimSummaryFileSetEnsemble.h"
+#include "Summary/RimSummaryAddress.h"
 #include "Tools/RimPlotAxisTools.h"
 
 #include "RiuPlotAxis.h"
@@ -128,6 +136,26 @@ RimHistogramPlot::~RimHistogramPlot()
     deletePlotCurvesAndPlotWidget();
 }
 
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimHistogramPlot::initAfterRead()
+{
+    for ( auto curve : histogramCurves() )
+    {
+        connectCurveSignals( curve );
+    }
+
+    for ( const auto& axisProperties : m_axisPropertiesArray )
+    {
+        auto plotAxisProperties = dynamic_cast<RimPlotAxisProperties*>( axisProperties.p() );
+        if ( plotAxisProperties )
+        {
+            connectAxisSignals( plotAxisProperties );
+        }
+    }
+}
+
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
@@ -1277,3 +1305,45 @@ RimHistogramPlot::GraphType RimHistogramPlot::graphType() const
 {
     return m_graphType();
 }
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimHistogramPlot::handleDroppedObjects( const std::vector<caf::PdmObjectHandle*>& objects )
+{
+    for ( auto obj : objects )
+    {
+        if ( auto fileSet = dynamic_cast<RimSummaryFileSetEnsemble*>( obj ) )
+        {
+            RicHistogramPlotTools::appendEnsembleToHistogram( this, fileSet );
+        }
+        else if ( auto parameter = dynamic_cast<RimSummaryEnsembleParameter*>( obj ) )
+        {
+            auto ensemble = RiaSummaryTools::ensembleById( parameter->ensembleId() );
+            if ( ensemble == nullptr ) continue;
+
+            auto newDataSource = new RimEnsembleParameterHistogramDataSource();
+            newDataSource->setEnsemble( ensemble );
+            newDataSource->setEnsembleParameter( parameter->name() );
+
+            RicHistogramPlotTools::appendEnsembleParameterHistogramCurve( this, newDataSource );
+        }
+        else if ( auto address = dynamic_cast<RimSummaryAddress*>( obj ) )
+        {
+            if ( !address->isEnsemble() ) continue;
+
+            auto ensemble = RiaSummaryTools::ensembleById( address->ensembleId() );
+            if ( ensemble == nullptr ) continue;
+
+            auto newDataSource = new RimEnsembleSummaryVectorHistogramDataSource();
+            newDataSource->setDefaults(); // get default timestep
+            auto fileAddress = address->address();
+            newDataSource->setSummaryAddress( fileAddress );
+            newDataSource->setEnsemble( ensemble );
+
+            RicHistogramPlotTools::createHistogramCurve( this, newDataSource );
+        }
+    }
+
+    scheduleReplotIfVisible();
+}

ApplicationLibCode/ProjectDataModel/Histogram/RimHistogramPlot.h

@@ -146,6 +146,8 @@ public:
 
     void scheduleReplotIfVisible();
 
+    std::vector<RimHistogramCurve*> histogramCurves() const;
+
 public:
     // RimViewWindow overrides
     void deleteViewWidget() override;
@@ -177,8 +179,12 @@ protected:
     void defineUiOrdering( QString uiConfigName, caf::PdmUiOrdering& uiOrdering ) override;
     void onLoadDataAndUpdate() override;
 
+    void handleDroppedObjects( const std::vector<caf::PdmObjectHandle*>& objects ) override;
+
     QImage snapshotWindowContent() override;
 
+    void initAfterRead() override;
+
 private slots:
     void onPlotZoomed();
     void onUpdateCurveOrder();
@@ -209,7 +215,6 @@ private:
 
     std::vector<RimPlotAxisPropertiesInterface*> allPlotAxes() const;
 
-    std::vector<RimHistogramCurve*> histogramCurves() const;
     std::vector<RimHistogramCurve*> visibleHistogramCurvesForAxis( RiuPlotAxis plotAxis ) const;
 
     void assignPlotAxis( RimHistogramCurve* curve );

ApplicationLibCode/ProjectDataModel/RimContextCommandBuilder.cpp

@@ -25,6 +25,7 @@
 #include "ContourMap/RimEclipseContourMapViewCollection.h"
 #include "Formations/RimFormationNames.h"
 #include "Formations/RimFormationNamesCollection.h"
+#include "Histogram/RimHistogramCurve.h"
 #include "Histogram/RimHistogramMultiPlot.h"
 #include "Histogram/RimHistogramPlot.h"
 #include "PlotTemplates/RimPlotTemplateFileItem.h"
@@ -992,6 +993,7 @@ caf::CmdFeatureMenuBuilder RimContextCommandBuilder::commandsFromSelection()
         }
         else if ( dynamic_cast<RimHistogramPlot*>( firstUiItem ) )
         {
+            menuBuilder << "RicPasteHistogramCurveFeature";
             menuBuilder.subMenuStart( "New Histogram Curve" );
 
             for ( RicHistogramPlotTools::DataSourceType dataSourceType : RicHistogramPlotTools::allDataSourceTypes() )
@@ -1002,6 +1004,10 @@ caf::CmdFeatureMenuBuilder RimContextCommandBuilder::commandsFromSelection()
 
             menuBuilder.subMenuEnd();
         }
+        else if ( dynamic_cast<RimHistogramCurve*>( firstUiItem ) )
+        {
+            menuBuilder << "RicPasteHistogramCurveFeature";
+        }
         else if ( dynamic_cast<RimMultiPlot*>( firstUiItem ) )
         {
             menuBuilder << "RicSnapshotViewToPdfFeature";

ApplicationLibCode/ProjectDataModel/Summary/Ensemble/CMakeLists_files.cmake

@@ -1,9 +1,13 @@
 set(SOURCE_GROUP_HEADER_FILES
     ${CMAKE_CURRENT_LIST_DIR}/RimSummaryFileSetEnsemble.h
+    ${CMAKE_CURRENT_LIST_DIR}/RimSummaryEnsembleParameter.h
+    ${CMAKE_CURRENT_LIST_DIR}/RimSummaryEnsembleParameterCollection.h
 )
 
 set(SOURCE_GROUP_SOURCE_FILES
     ${CMAKE_CURRENT_LIST_DIR}/RimSummaryFileSetEnsemble.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/RimSummaryEnsembleParameter.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/RimSummaryEnsembleParameterCollection.cpp
 )
 
 list(APPEND CODE_HEADER_FILES ${SOURCE_GROUP_HEADER_FILES})

ApplicationLibCode/ProjectDataModel/Summary/Ensemble/RimSummaryEnsembleParameter.cpp

@@ -0,0 +1,76 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2025 Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#include "RimSummaryEnsembleParameter.h"
+
+CAF_PDM_SOURCE_INIT( RimSummaryEnsembleParameter, "RimSummaryEnsembleParameter" );
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RimSummaryEnsembleParameter::RimSummaryEnsembleParameter()
+{
+    CAF_PDM_InitObject( "Summary Ensemble Parameter", ":/Parameter.svg" );
+    CAF_PDM_InitFieldNoDefault( &m_name, "Name", "Name" );
+    m_name.uiCapability()->setUiReadOnly( true );
+
+    CAF_PDM_InitField( &m_ensembleId, "EnsembleId", -1, "EnsembleId" );
+    m_ensembleId.uiCapability()->setUiHidden( true );
+
+    setDeletable( false );
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RimSummaryEnsembleParameter::~RimSummaryEnsembleParameter()
+{
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+QString RimSummaryEnsembleParameter::name() const
+{
+    return m_name;
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryEnsembleParameter::setName( const QString& name )
+{
+    setUiName( name );
+    m_name = name;
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryEnsembleParameter::setEnsembleId( int ensembleId )
+{
+    m_ensembleId = ensembleId;
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+int RimSummaryEnsembleParameter::ensembleId() const
+{
+    return m_ensembleId;
+}

ApplicationLibCode/ProjectDataModel/Summary/Ensemble/RimSummaryEnsembleParameter.h

@@ -0,0 +1,47 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2025  Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include "cafPdmField.h"
+#include "cafPdmObject.h"
+
+#include <QString>
+
+//==================================================================================================
+//
+//
+//==================================================================================================
+
+class RimSummaryEnsembleParameter : public caf::PdmObject
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    RimSummaryEnsembleParameter();
+    ~RimSummaryEnsembleParameter();
+
+    QString name() const;
+    void    setName( const QString& name );
+
+    void setEnsembleId( int ensembleId );
+    int  ensembleId() const;
+
+private:
+    caf::PdmField<QString> m_name;
+    caf::PdmField<int>     m_ensembleId;
+};

ApplicationLibCode/ProjectDataModel/Summary/Ensemble/RimSummaryEnsembleParameterCollection.cpp

@@ -0,0 +1,123 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2025 Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#include "RimSummaryEnsembleParameterCollection.h"
+
+#include "RimSummaryEnsembleParameter.h"
+
+#include "cafPdmUiTreeOrdering.h"
+
+CAF_PDM_SOURCE_INIT( RimSummaryEnsembleParameterCollection, "RimSummaryEnsembleParameterCollection" );
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RimSummaryEnsembleParameterCollection::RimSummaryEnsembleParameterCollection()
+{
+    CAF_PDM_InitObject( "Ensemble Parameters", ":/Parameter.svg", "", "" );
+
+    CAF_PDM_InitFieldNoDefault( &m_parameters, "Parameters", "Parameters" );
+
+    CAF_PDM_InitField( &m_ensembleId, "EnsembleId", -1, "EnsembleId" );
+    m_ensembleId.uiCapability()->setUiHidden( true );
+
+    nameField()->uiCapability()->setUiHidden( true );
+    nameField()->uiCapability()->setUiReadOnly( true );
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RimSummaryEnsembleParameterCollection::~RimSummaryEnsembleParameterCollection()
+{
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+bool RimSummaryEnsembleParameterCollection::hasParameter( const QString name ) const
+{
+    for ( const auto& p : m_parameters )
+    {
+        if ( p->name() == name ) return true;
+    }
+    return false;
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryEnsembleParameterCollection::addParameter( QString name, bool checkDuplicates )
+{
+    bool okToAdd = checkDuplicates ? !hasParameter( name ) : true;
+
+    if ( okToAdd )
+    {
+        auto p = new RimSummaryEnsembleParameter();
+        p->setName( name );
+        p->setEnsembleId( ensembleId() );
+        m_parameters.push_back( p );
+    }
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryEnsembleParameterCollection::deleteChildren()
+{
+    m_parameters.deleteChildren();
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+bool RimSummaryEnsembleParameterCollection::isEmpty() const
+{
+    return m_parameters.empty();
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryEnsembleParameterCollection::updateUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering ) const
+{
+    if ( isEmpty() ) return;
+
+    auto subnode = uiTreeOrdering.add( "Parameters", ":/Parameter.svg" );
+
+    for ( auto& p : m_parameters() )
+    {
+        subnode->add( p );
+    }
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimSummaryEnsembleParameterCollection::setEnsembleId( int ensembleId )
+{
+    m_ensembleId = ensembleId;
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+int RimSummaryEnsembleParameterCollection::ensembleId() const
+{
+    return m_ensembleId;
+}

ApplicationLibCode/ProjectDataModel/Summary/Ensemble/RimSummaryEnsembleParameterCollection.h

@@ -0,0 +1,54 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2025     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include "RimNamedObject.h"
+
+#include "cafPdmChildArrayField.h"
+
+#include <QString>
+#include <string>
+#include <vector>
+
+class RimSummaryEnsembleParameter;
+
+class RimSummaryEnsembleParameterCollection : public RimNamedObject
+{
+    CAF_PDM_HEADER_INIT;
+
+public:
+    RimSummaryEnsembleParameterCollection();
+    ~RimSummaryEnsembleParameterCollection() override;
+
+    void addParameter( QString name, bool checkDuplicates = true );
+    bool hasParameter( const QString name ) const;
+
+    void setEnsembleId( int ensembleId );
+    int  ensembleId() const;
+
+    void deleteChildren();
+
+    bool isEmpty() const;
+
+    void updateUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering ) const;
+
+private:
+    caf::PdmChildArrayField<RimSummaryEnsembleParameter*> m_parameters;
+
+    caf::PdmField<int> m_ensembleId;
+};

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryEnsemble.cpp

@@ -25,6 +25,7 @@
 #include "RiaStatisticsTools.h"
 #include "RiaStdStringTools.h"
 #include "RiaTextStringTools.h"
+#include "Summary/Ensemble/RimSummaryEnsembleParameterCollection.h"
 #include "Summary/RiaSummaryAddressAnalyzer.h"
 #include "Summary/RiaSummaryTools.h"
 
@@ -91,6 +92,12 @@ RimSummaryEnsemble::RimSummaryEnsemble()
     m_dataVectorFolders->uiCapability()->setUiTreeHidden( true );
     m_dataVectorFolders.xmlCapability()->disableIO();
 
+    CAF_PDM_InitFieldNoDefault( &m_ensembleParameters, "EnsembleParameters", "Ensemble Parameters" );
+    m_ensembleParameters = new RimSummaryEnsembleParameterCollection();
+    m_ensembleParameters.uiCapability()->setUiHidden( true );
+    m_ensembleParameters->uiCapability()->setUiTreeHidden( true );
+    m_ensembleParameters.xmlCapability()->disableIO();
+
     CAF_PDM_InitFieldNoDefault( &m_ensembleDescription, "Description", "Description" );
     m_ensembleDescription.registerGetMethod( this, &RimSummaryEnsemble::ensembleDescription );
     m_ensembleDescription.uiCapability()->setUiLabelPosition( caf::PdmUiItemInfo::TOP );
@@ -1000,6 +1007,8 @@ void RimSummaryEnsemble::defineUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrd
             }
         }
 
+        m_ensembleParameters->updateUiTreeOrdering( uiTreeOrdering );
+
         uiTreeOrdering.skipRemainingChildren( true );
     }
 }
@@ -1183,6 +1192,14 @@ void RimSummaryEnsemble::buildChildNodes()
     {
         m_dataVectorFolders->updateFolderStructure( ensembleSummaryAddresses(), -1, m_ensembleId );
     }
+    if ( m_ensembleParameters->isEmpty() )
+    {
+        m_ensembleParameters->setEnsembleId( ensembleId() );
+        for ( auto& ensPar : variationSortedEnsembleParameters() )
+        {
+            m_ensembleParameters->addParameter( ensPar.name, false /*check duplicate*/ );
+        }
+    }
 }
 
 //--------------------------------------------------------------------------------------------------

ApplicationLibCode/ProjectDataModel/Summary/RimSummaryEnsemble.h

@@ -40,6 +40,7 @@
 class RimSummaryCase;
 class RimSummaryAddressCollection;
 class RiaSummaryAddressAnalyzer;
+class RimSummaryEnsembleParameterCollection;
 
 //==================================================================================================
 ///
@@ -167,6 +168,8 @@ private:
     caf::PdmField<bool>                              m_isEnsemble;
     caf::PdmChildField<RimSummaryAddressCollection*> m_dataVectorFolders;
 
+    caf::PdmChildField<RimSummaryEnsembleParameterCollection*> m_ensembleParameters;
+
     caf::PdmField<int> m_ensembleId;
 
     mutable std::vector<RigEnsembleParameter>  m_cachedSortedEnsembleParameters;