tdf#131175 oox chart import: fix char color of <dLbl>, inherited from <dLbls>

There were two problems here:

1) Our chart model expects the char formatting of a data label as direct
formatting, so in case <c:dLbl> has no such formatting, but <c:dLbls>
has, oox has to explicitly inherit.

2) The data label char formatting is represented using
chart::FormattedString, but the char format of it is not (yet) exported
to ODF. Given that the char format of the series and the individual data
labels is the same, restore the same formatting on import to please
rendering.

With these, finally the chart labels in the bugdoc are white, not black
(and have a dark background, so they are readable).

(cherry picked from commit 8a43bfeffab9009c9f373e883fef87af1a7b3843)

Reviewed-on: https://gerrit.libreoffice.org/c/core/+/99026
Tested-by: Jenkins
Reviewed-by: Andras Timar <andras.timar@collabora.com>
(cherry picked from commit b894890cfdddc7dd38f483c9a9b2592a24dd1697)

Change-Id: Iebac5ce0be31a59bafb0f9fe7636330585e33822
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/103201
Tested-by: Gabor Kelemen <kelemen.gabor2@nisz.hu>
Reviewed-by: Gabor Kelemen <kelemen.gabor2@nisz.hu>

2 files changed, 57 insertions, 0 deletions

diff --git a/oox/source/drawingml/chart/seriesconverter.cxx b/oox/source/drawingml/chart/seriesconverter.cxx
index 2acf265847dc..ea13f93982bf 100644
--- a/oox/source/drawingml/chart/seriesconverter.cxx
+++ b/oox/source/drawingml/chart/seriesconverter.cxx
@@ -366,6 +366,42 @@ DataLabelsConverter::~DataLabelsConverter()
 {
 }
 
+namespace
+{
+/// Inherit <c:dLbl> text props (if not set) from <c:dLbls> text props (if set).
+void InheritFromDataLabelsTextProps(const DataLabelsModel& rLabels, const DataLabelModel& rLabel)
+{
+    // See if <c:dLbls> contains text properties to inherit.
+    if (!rLabels.mxTextProp.is() || rLabels.mxTextProp->getParagraphs().empty())
+    {
+        return;
+    }
+
+    const std::shared_ptr<TextParagraph>& rLabelsParagraph = rLabels.mxTextProp->getParagraphs()[0];
+
+    // See if <c:dLbl> lacks text properties.
+    if (rLabel.mxTextProp.is())
+    {
+        return;
+    }
+
+    if (!rLabel.mxText || !rLabel.mxText->mxTextBody
+        || rLabel.mxText->mxTextBody->getParagraphs().empty())
+    {
+        return;
+    }
+
+    const std::shared_ptr<TextParagraph>& rLabelParagraph
+        = rLabel.mxText->mxTextBody->getParagraphs()[0];
+
+    // Inherit rLabel.mxText's char props from rLabels.mxTextProp's char props.
+    TextCharacterProperties aCharProps;
+    aCharProps.assignUsed(rLabelsParagraph->getProperties().getTextCharacterProperties());
+    aCharProps.assignUsed(rLabelParagraph->getProperties().getTextCharacterProperties());
+    rLabelParagraph->getProperties().getTextCharacterProperties().assignUsed(aCharProps);
+}
+}
+
 void DataLabelsConverter::convertFromModel( const Reference< XDataSeries >& rxDataSeries, const TypeGroupConverter& rTypeGroup )
 {
     PropertySet aPropSet( rxDataSeries );
@@ -387,6 +423,7 @@ void DataLabelsConverter::convertFromModel( const Reference< XDataSeries >& rxDa
     {
         if (pointLabel->maNumberFormat.maFormatCode.isEmpty())
             pointLabel->maNumberFormat = mrModel.maNumberFormat;
+        InheritFromDataLabelsTextProps(mrModel, *pointLabel);
 
         DataLabelConverter aLabelConv(*this, *pointLabel);
         aLabelConv.convertFromModel( rxDataSeries, rTypeGroup );
diff --git a/xmloff/source/chart/SchXMLSeries2Context.cxx b/xmloff/source/chart/SchXMLSeries2Context.cxx
index ef6cd0249a7e..85711d9ffa9c 100644
--- a/xmloff/source/chart/SchXMLSeries2Context.cxx
+++ b/xmloff/source/chart/SchXMLSeries2Context.cxx
@@ -1119,6 +1119,26 @@ void SchXMLSeries2Context::setStylesToDataPoints( SeriesDefaultsAndStyles& rSeri
                         xLabels[j] = xCustomLabel;
                         xCustomLabel->setString(seriesStyle.mCustomLabels[j]);
                         xCustomLabel->setFieldType(chart2::DataPointCustomLabelFieldType::DataPointCustomLabelFieldType_TEXT);
+
+                        // Restore character properties on the text span manually, till
+                        // SchXMLExportHelper_Impl::exportCustomLabel() does not write the style.
+                        uno::Reference<beans::XPropertySetInfo> xPointPropInfo
+                            = xPointProp->getPropertySetInfo();
+                        if (xPointPropInfo.is())
+                        {
+                            uno::Sequence<beans::Property> aProperties = xPointPropInfo->getProperties();
+                            for (const auto& rProperty : std::as_const(aProperties))
+                            {
+                                if (!rProperty.Name.startsWith("Char")
+                                    || rProperty.Name.startsWith("Chart"))
+                                {
+                                    continue;
+                                }
+
+                                xCustomLabel->setPropertyValue(
+                                    rProperty.Name, xPointProp->getPropertyValue(rProperty.Name));
+                            }
+                        }
                     }
                     xPointProp->setPropertyValue("CustomLabelFields", uno::Any(xLabels));
                 }