validate dimension

src/xlsx/xlsxworksheet.cpp

@@ -2309,9 +2309,41 @@ bool Worksheet::loadFromXmlFile(QIODevice *device)
         }
     }
 
+    validateDimension();
     return true;
 }
 
+void Worksheet::validateDimension()
+{
+    Q_D(Worksheet);
+
+    if (d->dimension.isValid() || d->cellTable.isEmpty())
+        return;
+
+    int firstRow = d->cellTable.firstKey();
+    int lastRow = d->cellTable.lastKey();
+    int firstCell = -1;
+    int lastCell = -1;
+
+    for (QMap<int, QMap<int, QSharedPointer<Cell> > >::const_iterator it = d->cellTable.begin(),
+         lim = d->cellTable.end(); it != lim; ++it)
+    {
+        if (it.value().isEmpty())
+            continue;
+
+        if (firstCell == -1 || it.value().firstKey() < firstCell)
+            firstCell = it.value().firstKey();
+
+        if (lastCell == -1 || it.value().lastKey() > lastCell)
+            lastCell = it.value().lastKey();
+    }
+
+    CellRange cr(firstRow, firstCell, lastRow, lastCell);
+
+    if (cr.isValid())
+        d->dimension = cr;
+}
+
 /*!
  * \internal
  *  Unit test can use this member to get sharedString object.

src/xlsx/xlsxworksheet.h

@@ -153,6 +153,7 @@ private:
 
     void saveToXmlFile(QIODevice *device) const;
     bool loadFromXmlFile(QIODevice *device);
+    void validateDimension();
 };
 
 QT_END_NAMESPACE_XLSX