Move session management code from QApplication to QGuiApplication.

QSessionManager was already in QtGui, but not usable since the only API
to get to it was still in QtWidgets. Session management isn't related
to widgets, it also applies to QML apps on the desktop.

The virtual commitData and saveState methods have been removed,
given the two signals which exist since 4.2, and an additional
isSessionSaving() method was added instead.

Change-Id: I8099e70df133303e74456706827da21f013fcc6a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 1 insertions, 238 deletions

diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index faf68cb92b..8d4e63448d 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -54,7 +54,6 @@
 #include "qhash.h"
 #include "qset.h"
 #include "qlayout.h"
-#include "qsessionmanager.h"
 #include "qstyle.h"
 #include "qstyleoption.h"
 #include "qstylefactory.h"
@@ -160,10 +159,6 @@ QApplicationPrivate::QApplicationPrivate(int &argc, char **argv, int flags)
 {
     application_type = QApplicationPrivate::Gui;
 
-#ifndef QT_NO_SESSIONMANAGER
-    is_session_restored = false;
-#endif
-
 #ifndef QT_NO_GESTURES
     gestureManager = 0;
     gestureWidget = 0;
@@ -188,7 +183,7 @@ QApplicationPrivate::~QApplicationPrivate()
 
     QApplication specializes QGuiApplication with some functionality needed
     for QWidget-based applications. It handles widget specific initialization,
-    finalization, and provides session management.
+    finalization.
 
     For any GUI application using Qt, there is precisely \b one QApplication
     object, no matter whether the application has 0, 1, 2 or more windows at
@@ -233,14 +228,6 @@ QApplicationPrivate::~QApplicationPrivate()
 
             \li  It manages the application's mouse cursor handling, see
                 setOverrideCursor()
-
-            \li  It provides support for sophisticated \l{Session Management}
-                {session management}. This makes it possible for applications
-                to terminate gracefully when the user logs out, to cancel a
-                shutdown process if termination isn't possible and even to
-                preserve the entire application's state for a future session.
-                See isSessionRestored(), sessionId() and commitData() and
-                saveState() for details.
         \endlist
 
     Since the QApplication object does so much initialization, it \e{must} be
@@ -318,13 +305,6 @@ QApplicationPrivate::~QApplicationPrivate()
             restoreOverrideCursor().
 
         \row
-        \li  Session management
-        \li  isSessionRestored(),
-            sessionId(),
-            commitData(),
-            saveState().
-
-        \row
         \li  Miscellaneous
         \li  closeAllWindows(),
             startingUp(),
@@ -466,19 +446,6 @@ void QApplicationPrivate::process_cmdline()
             s = QString::fromLocal8Bit(arg.right(arg.length() - 7).toLower());
         } else if (arg == "-style" && i < argc-1) {
             s = QString::fromLocal8Bit(argv[++i]).toLower();
-#ifndef QT_NO_SESSIONMANAGER
-        } else if (arg == "-session" && i < argc-1) {
-            ++i;
-            if (argv[i] && *argv[i]) {
-                session_id = QString::fromLatin1(argv[i]);
-                int p = session_id.indexOf(QLatin1Char('_'));
-                if (p >= 0) {
-                    session_key = session_id.mid(p +1);
-                    session_id = session_id.left(p);
-                }
-                is_session_restored = true;
-            }
-#endif
 #ifndef QT_NO_STYLE_STYLESHEET
         } else if (arg == "-stylesheet" && i < argc -1) {
             styleSheet = QLatin1String("file:///");
@@ -539,9 +506,6 @@ void QApplicationPrivate::process_cmdline()
             \note Relative URLs in the Style Sheet file are relative to the
             Style Sheet file's path.
         \li  -stylesheet \e stylesheet, is the same as listed above.
-        \li  -session= \e session, restores the application from an earlier
-            \l{Session Management}{session}.
-        \li  -session \e session, is the same as listed above.
         \li  -widgetcount, prints debug message at the end about number of
             widgets left undestroyed and maximum number of widgets existed at
             the same time
@@ -626,10 +590,6 @@ void QApplicationPrivate::initialize()
     is_app_running = true; // no longer starting up
 
     Q_Q(QApplication);
-#ifndef QT_NO_SESSIONMANAGER
-    // connect to the session manager
-    session_manager = new QSessionManager(q, session_id, session_key);
-#endif
 
     if (qgetenv("QT_USE_NATIVE_WINDOWS").toInt() > 0)
         q->setAttribute(Qt::AA_NativeWindows);
@@ -769,10 +729,6 @@ QApplication::~QApplication()
 
     if (QApplicationPrivate::widgetCount)
         qDebug("Widgets left: %i    Max widgets: %i \n", QWidgetPrivate::instanceCounter, QWidgetPrivate::maxInstances);
-#ifndef QT_NO_SESSIONMANAGER
-    delete d->session_manager;
-    d->session_manager = 0;
-#endif //QT_NO_SESSIONMANAGER
 
     QApplicationPrivate::obey_desktop_settings = true;
 
@@ -2594,199 +2550,6 @@ QDesktopWidget *QApplication::desktop()
     return qt_desktopWidget;
 }
 
-
-/*!
-    \fn bool QApplication::isSessionRestored() const
-
-    Returns true if the application has been restored from an earlier
-    \l{Session Management}{session}; otherwise returns false.
-
-    \sa sessionId(), commitData(), saveState()
-*/
-
-
-/*!
-    \fn QString QApplication::sessionId() const
-
-    Returns the current \l{Session Management}{session's} identifier.
-
-    If the application has been restored from an earlier session, this
-    identifier is the same as it was in that previous session. The session
-    identifier is guaranteed to be unique both for different applications
-    and for different instances of the same application.
-
-    \sa isSessionRestored(), sessionKey(), commitData(), saveState()
-*/
-
-/*!
-    \fn QString QApplication::sessionKey() const
-
-    Returns the session key in the current \l{Session Management}{session}.
-
-    If the application has been restored from an earlier session, this key is
-    the same as it was when the previous session ended.
-
-    The session key changes with every call of commitData() or saveState().
-
-    \sa isSessionRestored(), sessionId(), commitData(), saveState()
-*/
-#ifndef QT_NO_SESSIONMANAGER
-bool QApplication::isSessionRestored() const
-{
-    Q_D(const QApplication);
-    return d->is_session_restored;
-}
-
-QString QApplication::sessionId() const
-{
-    Q_D(const QApplication);
-    return d->session_id;
-}
-
-QString QApplication::sessionKey() const
-{
-    Q_D(const QApplication);
-    return d->session_key;
-}
-#endif
-
-
-
-/*!
-    \since 4.2
-    \fn void QApplication::commitDataRequest(QSessionManager &manager)
-
-    This signal deals with \l{Session Management}{session management}. It is
-    emitted when the QSessionManager wants the application to commit all its
-    data.
-
-    Usually this means saving all open files, after getting permission from
-    the user. Furthermore you may want to provide a means by which the user
-    can cancel the shutdown.
-
-    You should not exit the application within this signal. Instead,
-    the session manager may or may not do this afterwards, depending on the
-    context.
-
-    \warning Within this signal, no user interaction is possible, \e
-    unless you ask the \a manager for explicit permission. See
-    QSessionManager::allowsInteraction() and
-    QSessionManager::allowsErrorInteraction() for details and example
-    usage.
-
-    \note You should use Qt::DirectConnection when connecting to this signal.
-
-    \sa isSessionRestored(), sessionId(), saveState(), {Session Management}
-*/
-
-/*!
-    This function deals with \l{Session Management}{session management}. It is
-    invoked when the QSessionManager wants the application to commit all its
-    data.
-
-    Usually this means saving all open files, after getting permission from the
-    user. Furthermore you may want to provide a means by which the user can
-    cancel the shutdown.
-
-    You should not exit the application within this function. Instead, the
-    session manager may or may not do this afterwards, depending on the
-    context.
-
-    \warning Within this function, no user interaction is possible, \e
-    unless you ask the \a manager for explicit permission. See
-    QSessionManager::allowsInteraction() and
-    QSessionManager::allowsErrorInteraction() for details and example
-    usage.
-
-    The default implementation requests interaction and sends a close event to
-    all visible top-level widgets. If any event was rejected, the shutdown is
-    canceled.
-
-    \note The default implementation emits the commitDataRequest() signal,
-    hence commitDataRequest() should be emitted when commitData() is
-    reimplemented.
-
-    \sa isSessionRestored(), sessionId(), saveState(), {Session Management}
-*/
-#ifndef QT_NO_SESSIONMANAGER
-void QApplication::commitData(QSessionManager& manager )
-{
-    emit commitDataRequest(manager);
-    if (manager.allowsInteraction()) {
-        QWidgetList done;
-        QWidgetList list = QApplication::topLevelWidgets();
-        bool cancelled = false;
-        for (int i = 0; !cancelled && i < list.size(); ++i) {
-            QWidget* w = list.at(i);
-            if (w->isVisible() && !done.contains(w)) {
-                cancelled = !w->close();
-                if (!cancelled)
-                    done.append(w);
-                list = QApplication::topLevelWidgets();
-                i = -1;
-            }
-        }
-        if (cancelled)
-            manager.cancel();
-    }
-}
-
-/*!
-    \since 4.2
-    \fn void QApplication::saveStateRequest(QSessionManager &manager)
-
-    This signal deals with \l{Session Management}{session management}. It is
-    invoked when the \l{QSessionManager}{session manager} wants the application
-    to preserve its state for a future session.
-
-    For example, a text editor would create a temporary file that includes the
-    current contents of its edit buffers, the location of the cursor and other
-    aspects of the current editing session.
-
-    You should never exit the application within this signal. Instead, the
-    session manager may or may not do this afterwards, depending on the
-    context. Futhermore, most session managers will very likely request a saved
-    state immediately after the application has been started. This permits the
-    session manager to learn about the application's restart policy.
-
-    \warning Within this function, no user interaction is possible, \e
-    unless you ask the \a manager for explicit permission. See
-    QSessionManager::allowsInteraction() and
-    QSessionManager::allowsErrorInteraction() for details.
-
-    \note You should use Qt::DirectConnection when connecting to this signal.
-
-    \sa isSessionRestored(), sessionId(), commitData(), {Session Management}
-*/
-
-/*!
-    This function deals with \l{Session Management}{session management}. It is
-    invoked when the \l{QSessionManager}{session manager} wants the application
-    to preserve its state for a future session.
-
-    For example, a text editor would create a temporary file that includes the
-    current contents of its edit buffers, the location of the cursor and other
-    aspects of the current editing session.
-
-    You should never exit the application within this function. Instead, the
-    session manager may or may not do this afterwards, depending on the
-    context. Futhermore, most session managers will very likely request a saved
-    state immediately after the application has been started. This permits the
-    session manager to learn about the application's restart policy.
-
-    \warning Within this function, no user interaction is possible, \e
-    unless you ask the \a manager for explicit permission. See
-    QSessionManager::allowsInteraction() and
-    QSessionManager::allowsErrorInteraction() for details.
-
-    \sa isSessionRestored(), sessionId(), commitData(), {Session Management}
-*/
-
-void QApplication::saveState(QSessionManager &manager)
-{
-    emit saveStateRequest(manager);
-}
-#endif //QT_NO_SESSIONMANAGER
 /*
   Sets the time after which a drag should start to \a ms ms.