Don't create the default "Sheet1" worksheet

Unless the user want to access it, or the user want to save an empty
workbook.

examples/xlsx/demo/main.cpp

@@ -93,8 +93,8 @@ int main()
     Document xlsx;
 
     //---------------------------------------------------------------
-    //The default sheet is "Sheet1"
+    //Create the first sheet (Otherwise, default "Sheet1" will be created)
-    xlsx.renameSheet("Sheet1", "Aligns & Borders");
+    xlsx.addSheet("Aligns & Borders");
     xlsx.setColumn("B", "B", 20);
     xlsx.setColumn("H", "H", 12);
     xlsx.currentWorksheet()->setGridLinesVisible(false);

src/xlsx/xlsxdocument.cpp

@@ -96,9 +96,6 @@ void DocumentPrivate::init()
 
     if (workbook.isNull())
         workbook = QSharedPointer<Workbook>(new Workbook(Workbook::F_NewFromScratch));
-
-    if (workbook->sheetCount() == 0)
-        workbook->addSheet();
 }
 
 bool DocumentPrivate::loadPackage(QIODevice *device)

src/xlsx/xlsxworkbook.cpp

@@ -255,6 +255,8 @@ AbstractSheet *Workbook::insertSheet(int index, const QString &name, AbstractShe
 AbstractSheet *Workbook::activeSheet() const
 {
     Q_D(const Workbook);
+    if (d->sheets.isEmpty())
+        const_cast<Workbook*>(this)->addSheet();
     return d->sheets[d->activesheetIndex].data();
 }
 
@@ -426,6 +428,8 @@ void Workbook::saveToXmlFile(QIODevice *device) const
 {
     Q_D(const Workbook);
     d->relationships->clear();
+    if (d->sheets.isEmpty())
+        const_cast<Workbook *>(this)->addSheet();
 
     QXmlStreamWriter writer(device);
 

tests/auto/document/tst_documenttest.cpp

@@ -308,6 +308,7 @@ void DocumentTest::testReadWriteTime()
 void DocumentTest::testMoveWorksheet()
 {
     Document xlsx1;
+    xlsx1.addSheet();//Sheet1
     xlsx1.addSheet();
 
     QCOMPARE(xlsx1.sheetNames(), QStringList()<<"Sheet1"<<"Sheet2");
@@ -320,6 +321,7 @@ void DocumentTest::testMoveWorksheet()
 void DocumentTest::testCopyWorksheet()
 {
     Document xlsx1;
+    xlsx1.addSheet();//Sheet1
     xlsx1.addSheet();
     xlsx1.write("A1", "String");
     xlsx1.write("A2", 999);
@@ -342,6 +344,7 @@ void DocumentTest::testCopyWorksheet()
 void DocumentTest::testDeleteWorksheet()
 {
     Document xlsx1;
+    xlsx1.addSheet();//Sheet1
     xlsx1.addSheet();
     xlsx1.addSheet();