ooxml: preserve dateFormat for unchanged date controls

When saving a date control in a docx document, we were overwriting its
date format with "dd/MM/yyyy" because it's tricky to support all the
possible combinations. Nonetheless, there is no need to overwrite it
if the date in the control remains unchanged during edition.

We preserve the original date of the control, its date format and the
formatted date string on import, and we compare the date in the
control with the original one on export to check if we can write the
old values or we have to re-generate them. Only in case the date has
changed the format will be reset to "dd/MM/yyyy".

We had to add an InteropGrabBag field to the XControlShape because it
didn't have one, unlike other shapes.

Unit tests were modified to check that the dateFormat field is
preserved unchanged.

Change-Id: I01e5c990e90ff190b5a6d7ea3853e049ff24ef0a

3 files changed, 34 insertions, 3 deletions

diff --git a/sw/qa/extras/ooxmlexport/data/date-control.docx b/sw/qa/extras/ooxmlexport/data/date-control.docx
index 0563d56aac35..fdf229913702 100644
--- a/sw/qa/extras/ooxmlexport/data/date-control.docx
+++ b/sw/qa/extras/ooxmlexport/data/date-control.docx
diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport.cxx
index 80189af85323..957dfbe9430d 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport.cxx
@@ -2963,7 +2963,8 @@ DECLARE_OOXMLEXPORT_TEST(testDateControl, "date-control.docx")
     if (!pXmlDoc)
         return;
     assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:sdt/w:sdtPr/w:date", "fullDate", "2014-03-05T00:00:00Z");
-    assertXPathContent(pXmlDoc, "/w:document/w:body/w:p/w:sdt/w:sdtContent/w:r/w:t", "05/03/2014");
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:sdt/w:sdtPr/w:date/w:dateFormat", "val", "dddd, dd' de 'MMMM' de 'yyyy");
+    assertXPathContent(pXmlDoc, "/w:document/w:body/w:p/w:sdt/w:sdtContent/w:r/w:t", "miércoles, 05 de marzo de 2014");
 
     // check imported control
     uno::Reference<drawing::XControlShape> xControl(getShape(1), uno::UNO_QUERY);
diff --git a/sw/source/filter/ww8/docxattributeoutput.cxx b/sw/source/filter/ww8/docxattributeoutput.cxx
index 294927108bc3..a233c2317adc 100644
--- a/sw/source/filter/ww8/docxattributeoutput.cxx
+++ b/sw/source/filter/ww8/docxattributeoutput.cxx
@@ -3599,6 +3599,25 @@ void DocxAttributeOutput::WritePostponedFormControl(const SdrObject* pObject)
             {
                 // gather component properties
 
+                Date aOriginalDate(Date::EMPTY);
+                OUString sOriginalContent, sDateFormat;
+                uno::Sequence<beans::PropertyValue> aGrabBag;
+                uno::Reference<beans::XPropertySet> xShapePropertySet(pFormObj->getUnoShape(), uno::UNO_QUERY);
+                if (xShapePropertySet->getPropertyValue(UNO_NAME_MISC_OBJ_INTEROPGRABBAG) >>= aGrabBag)
+                    for (sal_Int32 i=0; i < aGrabBag.getLength(); ++i)
+                        if (aGrabBag[i].Name == "DateFormat")
+                            aGrabBag[i].Value >>= sDateFormat;
+                        else if (aGrabBag[i].Name == "OriginalContent")
+                            aGrabBag[i].Value >>= sOriginalContent;
+                        else if (aGrabBag[i].Name == "OriginalDate")
+                        {
+                            css::util::Date aUNODate;
+                            aGrabBag[i].Value >>= aUNODate;
+                            aOriginalDate.SetDay(aUNODate.Day);
+                            aOriginalDate.SetMonth(aUNODate.Month);
+                            aOriginalDate.SetYear(aUNODate.Year);
+                        }
+
                 uno::Reference<beans::XPropertySet> xPropertySet(xControlModel, uno::UNO_QUERY);
 
                 OString sDate;
@@ -3610,7 +3629,17 @@ void DocxAttributeOutput::WritePostponedFormControl(const SdrObject* pObject)
                     bHasDate = true;
                     Date aDate(aUNODate.Day, aUNODate.Month, aUNODate.Year);
                     sDate = DateToOString(aDate);
-                    aContentText = OUString::createFromAscii(DateToDDMMYYYYOString(aDate).getStr());
+
+                    if (aOriginalDate == aDate)
+                    {
+                        aContentText = sOriginalContent;
+                        // sDateFormat was extracted from the grab bag
+                    }
+                    else
+                    {
+                        aContentText = OUString::createFromAscii(DateToDDMMYYYYOString(aDate).getStr());
+                        sDateFormat = "dd/MM/yyyy";
+                    }
                 }
                 else
                     aContentText = xPropertySet->getPropertyValue("HelpText").get<OUString>();
@@ -3628,7 +3657,8 @@ void DocxAttributeOutput::WritePostponedFormControl(const SdrObject* pObject)
                     m_pSerializer->startElementNS(XML_w, XML_date, FSEND);
 
                 m_pSerializer->singleElementNS(XML_w, XML_dateFormat,
-                                               FSNS(XML_w, XML_val), "dd/MM/yyyy", //TODO: hardwired
+                                               FSNS(XML_w, XML_val),
+                                               rtl::OUStringToOString( sDateFormat, RTL_TEXTENCODING_UTF8 ).getStr(),
                                                FSEND);
                 m_pSerializer->singleElementNS(XML_w, XML_lid,
                                                FSNS(XML_w, XML_val), "en-US",      //TODO: hardwired