#3277 Implement stepping for Common Data Source and rename Plot Source Stepping for summary plots.

* The name for the UI groups is now "Data Source" for both types of data source stepping.

ApplicationCode/ProjectDataModel/RimDataSourceSteppingTools.cpp

@@ -0,0 +1,46 @@
+#include "RimDataSourceSteppingTools.h"
+
+#include "cvfAssert.h"
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RimDataSourceSteppingTools::modifyCurrentIndex(caf::PdmValueField* valueField, const QList<caf::PdmOptionItemInfo>& options, int indexOffset)
+{
+    if (valueField && !options.isEmpty())
+    {
+        QVariant currentValue = valueField->toQVariant();
+        caf::PdmPointer<caf::PdmObjectHandle> currentHandle = currentValue.value<caf::PdmPointer<caf::PdmObjectHandle>>();
+        int currentIndex = -1;
+        for (int i = 0; i < options.size(); i++)
+        {
+            QVariant optionValue = options[i].value();
+            // First try pointer variety. They are not supported by QVariant::operator==
+            caf::PdmPointer<caf::PdmObjectHandle> optionHandle = optionValue.value<caf::PdmPointer<caf::PdmObjectHandle>>();
+            if (optionHandle)
+            {
+                if (currentHandle == optionHandle)
+                {
+                    currentIndex = i;
+                }
+            }
+            else if (currentValue == optionValue)
+            {                
+                currentIndex = i;
+            }
+        }
+
+        if (currentIndex == -1)
+        {
+            currentIndex = 0;
+        }
+
+        int nextIndex = currentIndex + indexOffset;
+        if (nextIndex < options.size() && nextIndex > -1)
+        {
+            QVariant newValue = options[nextIndex].value();
+            valueField->setFromQVariant(newValue);
+            valueField->uiCapability()->notifyFieldChanged(currentValue, newValue);
+        }
+    }
+}