doc: Mark all qpa classes as internal

All QPA api as marked as so:
    * preliminary - the api is subject to change anytime
    * internal - internal api that shouldn't be used by apps
    * ingroup qpa - "qpa" module. In the long run, qdoc should
      generate documentation for qplatform* API as if it were
      a seperate module.

Change-Id: I4e76c0e0c1805c679cabd52d5006f9fa9bc411c0
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

src/gui/accessible/qplatformaccessibility_qpa.cpp

@@ -59,12 +59,15 @@ Q_GLOBAL_STATIC(QVector<QAccessibleBridge *>, bridges)
 
 /*!
     \class QPlatformAccessibility
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+    \ingroup accessibility
+
     \brief The QPlatformAccessibility class is the base class for
     integrating accessibility backends
 
-    \preliminary
-    \ingroup accessibility
-
     \sa QAccessible
 */
 QPlatformAccessibility::QPlatformAccessibility()

src/gui/image/qplatformpixmap.cpp

@@ -49,6 +49,15 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformPixmap
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformPixmap class provides an abstraction for native pixmaps.
+ */
 QPlatformPixmap *QPlatformPixmap::create(int w, int h, PixelType type)
 {
     QPlatformPixmap *data = QGuiApplicationPrivate::platformIntegration()->createPlatformPixmap(static_cast<QPlatformPixmap::PixelType>(type));

src/gui/kernel/qplatformclipboard_qpa.cpp

@@ -79,6 +79,16 @@ QClipboardData::~QClipboardData()
 
 Q_GLOBAL_STATIC(QClipboardData,q_clipboardData);
 
+/*!
+    \class QPlatformClipboard
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformClipboard class provides an abstraction for the system clipboard.
+ */
+
 QPlatformClipboard::~QPlatformClipboard()
 {
 

src/gui/kernel/qplatformcursor_qpa.cpp

@@ -62,6 +62,10 @@ QList<QPlatformCursor *> QPlatformCursorPrivate::getInstances()
 
 /*!
     \class QPlatformCursor
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
 
     \brief The QPlatformCursor class provides information about
     pointer device events (movement, buttons), and requests to change
@@ -124,6 +128,10 @@ void QPlatformCursor::setPos(const QPoint &pos)
 
 /*!
     \class QPlatformCursorImage
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
 
     \brief The QPlatformCursorImage class provides a set of graphics
     intended to be used as cursors.

src/gui/kernel/qplatformdialoghelper_qpa.cpp

@@ -54,6 +54,8 @@ QT_BEGIN_NAMESPACE
     \class QPlatformDialogHelper
     \since 5.0
     \internal
+    \ingroup qpa
+
     \brief The QPlatformDialogHelper class allows for platform-specific customization of dialogs.
 
 */
@@ -159,6 +161,15 @@ QFontDialogOptions::FontDialogOptions QFontDialogOptions::options() const
     return d->options;
 }
 
+/*!
+    \class QPlatformFontDialogHelper
+    \since 5.0
+    \internal
+    \ingroup qpa
+
+    \brief The QPlatformFontDialogHelper class allows for platform-specific customization of font dialogs.
+
+*/
 const QSharedPointer<QFontDialogOptions> &QPlatformFontDialogHelper::options() const
 {
     return m_options;
@@ -327,6 +338,15 @@ void QColorDialogOptions::setStandardColor(int index, QRgb color)
     qColorDialogStaticData()->standardRgb[index] = color;
 }
 
+/*!
+    \class QPlatformColorDialogHelper
+    \since 5.0
+    \internal
+    \ingroup qpa
+
+    \brief The QPlatformColorDialogHelper class allows for platform-specific customization of color dialogs.
+
+*/
 const QSharedPointer<QColorDialogOptions> &QPlatformColorDialogHelper::options() const
 {
     return m_options;
@@ -543,6 +563,15 @@ void QFileDialogOptions::setInitiallySelectedFiles(const QStringList &files)
     d->initiallySelectedFiles = files;
 }
 
+/*!
+    \class QPlatformFileDialogHelper
+    \since 5.0
+    \internal
+    \ingroup qpa
+
+    \brief The QPlatformFileDialogHelper class allows for platform-specific customization of file dialogs.
+
+*/
 const QSharedPointer<QFileDialogOptions> &QPlatformFileDialogHelper::options() const
 {
     return m_options;

src/gui/kernel/qplatformdrag_qpa.cpp

@@ -82,6 +82,15 @@ public:
     Qt::DropAction cursor_drop_action;
 };
 
+/*!
+    \class QPlatformDrag
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformDrag class provides an abstraction for drag.
+ */
 QPlatformDrag::QPlatformDrag() : d_ptr(new QPlatformDragPrivate)
 {
 }

src/gui/kernel/qplatforminputcontext_qpa.cpp

@@ -49,6 +49,10 @@ QT_BEGIN_NAMESPACE
 
 /*!
     \class QPlatformInputContext
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
     \brief The QPlatformInputContext class abstracts the input method dependent data and composing state.
 
     An input method is responsible for inputting complex text that cannot

src/gui/kernel/qplatformnativeinterface_qpa.cpp

@@ -43,6 +43,17 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformNativeInterface
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformNativeInterface class provides an abstraction for retrieving native
+    resource handles.
+ */
+
 void *QPlatformNativeInterface::nativeResourceForIntegration(const QByteArray &resource)
 {
     Q_UNUSED(resource);

src/gui/kernel/qplatformscreenpageflipper_qpa.cpp

@@ -43,6 +43,15 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformScreenBuffer
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformScreenBuffer class provides an abstraction for screen buffers.
+ */
 QPlatformScreenBuffer::QPlatformScreenBuffer()
     : m_destroyed(false)
     , m_ready(true)
@@ -73,6 +82,18 @@ void QPlatformScreenBuffer::displayed()
 {
 }
 
+
+/*!
+    \class QPlatformScreenPageFlipper
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformScreenPageFlipper class provides an abstraction for flipping the screen
+    page.
+ */
+
 QPlatformScreenPageFlipper::QPlatformScreenPageFlipper(QObject *parent)
     :QObject(parent)
 {

src/gui/kernel/qplatformsurface_qpa.cpp

@@ -43,6 +43,15 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformSurface
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformSurface class provides an abstraction for a surface.
+ */
 QPlatformSurface::~QPlatformSurface()
 {
 

src/gui/kernel/qplatformthemeplugin_qpa.cpp

@@ -43,6 +43,15 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformThemePlugin
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformScreen class provides an abstraction for theme plugins.
+ */
 QPlatformThemePlugin::QPlatformThemePlugin(QObject *parent)
     : QObject(parent)
 {

src/gui/text/qplatformfontdatabase_qpa.cpp

@@ -415,11 +415,15 @@ bool QPlatformFontDatabase::fontsAlwaysScalable() const
 
 /*!
     \class QPlatformFontDatabase
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+    \ingroup painting
+
     \brief The QPlatformFontDatabase class makes it possible to customize how fonts
     are discovered and how they are rendered
 
-    \ingroup painting
-
     QPlatformFontDatabase is the superclass which is intended to let platform implementations use
     native font handling.
 

src/printsupport/kernel/qplatformprintersupport_qpa.cpp

@@ -49,6 +49,16 @@
 
 QT_BEGIN_NAMESPACE
 
+/*!
+    \class QPlatformPrinterSupport
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformPrinterSupport class provides an abstraction for print support.
+ */
+
 QPlatformPrinterSupport::QPlatformPrinterSupport()
 {
 }

src/widgets/kernel/qplatformmenu_qpa.cpp

@@ -43,18 +43,30 @@
 
 QT_BEGIN_NAMESPACE
 
-//
-// QPlatformMenuAction
-//
+/*!
+    \class QPlatformMenuAction
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformMenuAction class provides an abstraction for menu actions.
+ */
 
 QPlatformMenuAction::~QPlatformMenuAction()
 {
 
 }
 
-//
-// QPlatformMenu
-//
+/*!
+    \class QPlatformMenu
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformMenu class provides an abstraction for menus.
+ */
 QPlatformMenu::QPlatformMenu()
 {
 }
@@ -74,9 +86,15 @@ void QPlatformMenu::syncSeparatorsCollapsible(bool enable)
     Q_UNUSED(enable);
 }
 
-//
-// QPlatformMenuBar
-//
+/*!
+    \class QPlatformMenuBar
+    \since 5.0
+    \internal
+    \preliminary
+    \ingroup qpa
+
+    \brief The QPlatformMenuBar class provides an abstraction for menu bars.
+ */
 QPlatformMenuBar::QPlatformMenuBar()
 {