fdo#77506: More reliable way to determine label strings.

Not beautiful, but doable.

Change-Id: I6f3b00d620e7d7d19cc05ec4239deeb14d0d5201
(cherry picked from commit a2a1a59a)

sc/inc/unonames.hxx

@@ -654,6 +654,8 @@
 #define SC_UNONAME_INCLUDEHIDDENCELLS   "IncludeHiddenCells"
 #define SC_UNONAME_HIDDENVALUES     "HiddenValues"
 #define SC_UNONAME_USE_INTERNAL_DATA_PROVIDER "UseInternalDataProvider"
+#define SC_UNONAME_HAS_STRING_LABEL "HasStringLabel"
+#define SC_UNONAME_TIME_BASED       "TimeBased"
 
 // Solver
 #define SC_UNONAME_TIMEOUT          "Timeout"

sc/source/ui/unoobj/chart2uno.cxx

@@ -3530,10 +3530,22 @@ uno::Any SAL_CALL ScChart2DataSequence::getPropertyValue(const OUString& rProper
         BuildDataCache();
         aRet <<= m_aHiddenValues;
     }
-    else if (rPropertyName == "TimeBased")
+    else if (rPropertyName == SC_UNONAME_TIME_BASED)
     {
         aRet <<= mbTimeBased;
     }
+    else if (rPropertyName == SC_UNONAME_HAS_STRING_LABEL)
+    {
+        // Read-only property.  It returns whether or not the label value is a
+        // direct user input, rather than an indirect reference.
+        bool bHasStringLabel = false;
+        if (m_pTokens->size() == 1)
+        {
+            const ScToken& rToken = *(*m_pTokens)[0];
+            bHasStringLabel = rToken.GetType() == formula::svString;
+        }
+        aRet <<= bHasStringLabel;
+    }
     else
         throw beans::UnknownPropertyException();
     // TODO: support optional properties

xmloff/source/chart/SchXMLExport.cxx

@@ -2572,7 +2572,6 @@ void SchXMLExportHelper_Impl::exportSeries(
 
     OUString aFirstXDomainRange;
     OUString aFirstYDomainRange;
-    bool modifyLabelRange = false;
 
     std::vector< XMLPropertyState > aPropertyStates;
 
@@ -2718,28 +2717,36 @@ void SchXMLExportHelper_Impl::exportSeries(
                                     // #i75297# allow empty series, export empty range to have all ranges on import
                                     mrExport.AddAttribute( XML_NAMESPACE_CHART, XML_VALUES_CELL_RANGE_ADDRESS, OUString());
 
-                                if( xLabelSeq.is()) {
-                                    OUString aRange = xLabelSeq->getSourceRangeRepresentation();
-                                    if ( nSeriesIdx == 0 && aRange.equalsAscii("label 1"))
-                                        modifyLabelRange = true;
-                                    if (modifyLabelRange)
-                                        aRange = "label " + OUString::number(aRange.copy( OUString("label").getLength()).toInt32() - 1);
-
-                                    OUString aXMLRange = lcl_ConvertRange( aRange, xNewDoc );
-                                    if(aXMLRange.isEmpty() && !aRange.isEmpty())
+                                if (xLabelSeq.is())
+                                {
+                                    // Check if the label is direct string value rather than a reference.
+                                    bool bHasString = false;
+                                    uno::Reference<beans::XPropertySet> xLSProp(xLabelSeq, uno::UNO_QUERY);
+                                    if (xLSProp.is())
                                     {
-                                        // might just be a string
-                                        bool bIsString = isString(aRange);
-                                        if(bIsString)
+                                        try
                                         {
-                                            mrExport.AddAttribute( XML_NAMESPACE_LO_EXT,
-                                                    XML_LABEL_STRING, aRange );
+                                            xLSProp->getPropertyValue("HasStringLabel") >>= bHasString;
                                         }
+                                        catch (const beans::UnknownPropertyException&) {}
+                                    }
+
+                                    OUString aRange = xLabelSeq->getSourceRangeRepresentation();
+
+                                    if (bHasString)
+                                    {
+                                        mrExport.AddAttribute(
+                                            XML_NAMESPACE_LO_EXT, XML_LABEL_STRING, aRange);
                                     }
                                     else
-                                        mrExport.AddAttribute( XML_NAMESPACE_CHART,
-                                                XML_LABEL_CELL_ADDRESS, aXMLRange );
+                                    {
+                                        mrExport.AddAttribute(
+                                            XML_NAMESPACE_CHART, XML_LABEL_CELL_ADDRESS,
+                                                lcl_ConvertRange(
+                                                    xLabelSeq->getSourceRangeRepresentation(), xNewDoc));
+                                    }
                                 }
+
                                 if( xLabelSeq.is() || xValuesSeq.is() )
                                     aSeriesLabelValuesPair = tLabelValuesDataPair( xLabelSeq, xValuesSeq );