oox: import Math objects from PPTX files

This is quite hacky and limited: in OOXML these are not OLE objects but
occur inside text boxes, and PPT 2010 allows inserting multiple Math
objects into one text box but Impress does not have as-character
anchored objects, so we can't import that properly; for now only import
Math if there is nothing else in the text box.

Also for now only import them as children of TextParagraphContext (a:p);
it's not clear what the possible parent elements could be since the
OOXML standard only lists WordProcessingML parent elements :(

Change-Id: I847f810084c9ddae4b60f93896fb73a742683cc2

1 files changed, 13 insertions, 0 deletions

diff --git a/oox/inc/drawingml/textparagraph.hxx b/oox/inc/drawingml/textparagraph.hxx
index f96989cffa8e..43bf51a363fa 100644
--- a/oox/inc/drawingml/textparagraph.hxx
+++ b/oox/inc/drawingml/textparagraph.hxx
@@ -28,6 +28,11 @@
 #include <drawingml/textliststyle.hxx>
 #include <drawingml/textparagraphproperties.hxx>
 
+
+namespace oox { namespace formulaimport {
+    class XmlStreamBuilder;
+} }
+
 namespace oox { namespace drawingml {
 
 typedef RefVector< TextRun > TextRunVector;
@@ -57,10 +62,18 @@ public:
                                     bool bFirst = false,
                                     float nDefaultCharHeight = 0) const;
 
+    bool HasMathXml() const
+    {
+        return m_pMathXml != nullptr;
+    }
+    formulaimport::XmlStreamBuilder & GetMathXml();
+
 private:
     TextParagraphProperties     maProperties;
     TextCharacterProperties     maEndProperties;
     TextRunVector               maRuns;
+    // temporarily store this here
+    std::unique_ptr<formulaimport::XmlStreamBuilder> m_pMathXml;
 };
 
 } }