Add a warning message in all the private headers

src/xlsx/xlsxcell_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXCELL_P_H
 #define XLSXCELL_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include "xlsxcell.h"
 #include "xlsxcellrange.h"

src/xlsx/xlsxcontenttypes_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXCONTENTTYPES_H
 #define XLSXCONTENTTYPES_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QString>
 #include <QStringList>
 #include <QMap>

src/xlsx/xlsxdatavalidation_p.h

@@ -25,6 +25,18 @@
 
 #ifndef XLSXDATAVALIDATION_P_H
 #define XLSXDATAVALIDATION_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxdatavalidation.h"
 #include <QSharedData>
 

src/xlsx/xlsxdocpropsapp_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXDOCPROPSAPP_H
 #define XLSXDOCPROPSAPP_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include <QList>
 #include <QPair>

src/xlsx/xlsxdocpropscore_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXDOCPROPSCORE_H
 #define XLSXDOCPROPSCORE_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include <QMap>
 #include <QStringList>

src/xlsx/xlsxdocument_p.h

@@ -26,6 +26,17 @@
 #ifndef XLSXDOCUMENT_P_H
 #define XLSXDOCUMENT_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxdocument.h"
 #include "xlsxworkbook.h"
 

src/xlsx/xlsxdrawing_p.h

@@ -26,6 +26,17 @@
 #ifndef QXLSX_DRAWING_H
 #define QXLSX_DRAWING_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QList>
 #include <QString>
 

src/xlsx/xlsxformat_p.h

@@ -24,6 +24,18 @@
 ****************************************************************************/
 #ifndef XLSXFORMAT_P_H
 #define XLSXFORMAT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxformat.h"
 #include <QSharedData>
 #include <QMap>

src/xlsx/xlsxpackage_p.h

@@ -25,6 +25,17 @@
 #ifndef QXLSX_PACKAGE_H
 #define QXLSX_PACKAGE_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include <QString>
 class QIODevice;

src/xlsx/xlsxrelationships_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXRELATIONSHIPS_H
 #define XLSXRELATIONSHIPS_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include <QList>
 #include <QString>

src/xlsx/xlsxrichstring_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXRICHSTRING_P_H
 #define XLSXRICHSTRING_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxrichstring.h"
 
 QT_BEGIN_NAMESPACE_XLSX

src/xlsx/xlsxsharedstrings_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXSHAREDSTRINGS_H
 #define XLSXSHAREDSTRINGS_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include "xlsxrichstring.h"
 #include <QHash>

src/xlsx/xlsxstyles_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXSTYLES_H
 #define XLSXSTYLES_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include "xlsxformat.h"
 #include <QSharedPointer>

src/xlsx/xlsxtheme_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXTHEME_H
 #define XLSXTHEME_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QString>
 class QIODevice;
 

src/xlsx/xlsxutility_p.h

@@ -25,6 +25,17 @@
 #ifndef XLSXUTILITY_H
 #define XLSXUTILITY_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 class QPoint;
 class QString;

src/xlsx/xlsxworkbook_p.h

@@ -24,6 +24,18 @@
 ****************************************************************************/
 #ifndef XLSXWORKBOOK_P_H
 #define XLSXWORKBOOK_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxworkbook.h"
 #include "xlsxtheme_p.h"
 #include <QSharedPointer>

src/xlsx/xlsxworksheet_p.h

@@ -24,6 +24,18 @@
 ****************************************************************************/
 #ifndef XLSXWORKSHEET_P_H
 #define XLSXWORKSHEET_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include "xlsxworksheet.h"
 #include "xlsxcell.h"

src/xlsx/xlsxzipreader_p.h

@@ -26,6 +26,17 @@
 #ifndef QXLSX_XLSXZIPREADER_P_H
 #define QXLSX_XLSXZIPREADER_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include "xlsxglobal.h"
 #include <QScopedPointer>
 #include <QStringList>

src/xlsx/xlsxzipwriter_p.h

@@ -25,6 +25,17 @@
 #ifndef QXLSX_ZIPWRITER_H
 #define QXLSX_ZIPWRITER_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt Xlsx API.  It exists for the convenience
+// of the Qt Xlsx.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QString>
 class QIODevice;
 class QZipWriter;