tdf#143942: oox: import/export labels from <c15:datalabelsRange>

When <c15:showDataLabelsRange> boolean flag is present, the imported
label texts are added as the first text field in oox data label model.
The cell-range associated is also preserved. The export part preserves
the how labels were store originally in <c15:datalabelsRange>.

However in order to make the custom labels reflect the contents of the
cells in the associated cell-range, more work needs to be done. For this
the labels present in <c15:datalabelsRange> needs to be made available
as a data-sequence with a new "role" like "point-labels" in
XInternalDataProvider implementation and and make the label renderer
read this data source rather than consulting the custom label fields
property which is static after import.

Change-Id: Ibc7045fa5ea209d463680c96efb49a06662d2500
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/121313
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

1 files changed, 39 insertions, 1 deletions

diff --git a/include/oox/export/chartexport.hxx b/include/oox/export/chartexport.hxx
index 5dbf8c20ac0b..c4440ae08419 100644
--- a/include/oox/export/chartexport.hxx
+++ b/include/oox/export/chartexport.hxx
@@ -91,6 +91,43 @@ struct AxisIdPair{
     {}
 };
 
+/**
+ A helper container class to collect the chart data point labels and the address
+ of the cell[range] from which the labels are sourced if that is the case. This
+ is then used to write the label texts under the extension tag <c15:datalabelsRange>.
+
+ @since LibreOffice 7.3.0
+ */
+class DataLabelsRange
+{
+public:
+
+    /// type of the internal container that stores the indexed label text.
+    typedef std::map<sal_Int32, OUString> LabelsRangeMap;
+
+    /// Returns whether the container is empty or not.
+    bool empty() const;
+    /// Returns the count of labels stored.
+    size_t count() const;
+    /// Indicates whether the container has a label with index specified by nIndex.
+    bool hasLabel(sal_Int32 nIndex) const;
+    /// Returns the address of the cell[range] from which label contents are sourced.
+    OUString getRange() const;
+
+    /// Sets the address of the cell[range] from which label contents are sourced.
+    void setRange(const OUString& rRange);
+    /// Adds a new indexed label text.
+    void setLabel(sal_Int32 nIndex, const OUString& rText);
+
+    LabelsRangeMap::const_iterator begin() const;
+    LabelsRangeMap::const_iterator end() const;
+
+private:
+    OUString         maRange;
+    LabelsRangeMap   maLabels;
+};
+
+
 class OOX_DLLPUBLIC ChartExport final : public DrawingML {
 
 public:
@@ -184,7 +221,8 @@ private:
     void exportDataPoints(
         const css::uno::Reference< css::beans::XPropertySet >& xSeriesProperties,
         sal_Int32 nSeriesLength, sal_Int32 eChartType );
-    void exportDataLabels( const css::uno::Reference<css::chart2::XDataSeries>& xSeries, sal_Int32 nSeriesLength, sal_Int32 eChartType );
+    void exportDataLabels( const css::uno::Reference<css::chart2::XDataSeries>& xSeries, sal_Int32 nSeriesLength,
+        sal_Int32 eChartType, DataLabelsRange& rDLblsRange );
     void exportGrouping( bool isBar = false );
     void exportTrendlines( const css::uno::Reference< css::chart2::XDataSeries >& xSeries );
     void exportMarker( const css::uno::Reference< css::beans::XPropertySet >& xPropSet );