Export QAbstractState active property.

It is needed to check if a State is active.

Change-Id: I8aa0230b8cd96fb9b95b86b2ce118fe280f9ce97
Reviewed-by: Alan Alpert <aalpert@blackberry.com>

src/corelib/statemachine/qabstractstate.cpp

@@ -79,8 +79,17 @@ QT_BEGIN_NAMESPACE
   function to perform custom processing when the state is exited.
 */
 
+/*!
+    \property QAbstractState::active
+    \since 5.4
+
+    \brief the active property of this state. A state is active between
+    entered() and exited() signals.
+*/
+
+
 QAbstractStatePrivate::QAbstractStatePrivate(StateType type)
-    : stateType(type), isMachine(false), parentState(0)
+    : stateType(type), isMachine(false), active(false), parentState(0)
 {
 }
 
@@ -121,11 +130,19 @@ void QAbstractStatePrivate::emitEntered()
 {
     Q_Q(QAbstractState);
     emit q->entered(QAbstractState::QPrivateSignal());
+    if (!active) {
+        active = true;
+        emit q->activeChanged(true);
+    }
 }
 
 void QAbstractStatePrivate::emitExited()
 {
     Q_Q(QAbstractState);
+    if (active) {
+        active = false;
+        emit q->activeChanged(false);
+    }
     emit q->exited(QAbstractState::QPrivateSignal());
 }
 
@@ -173,6 +190,17 @@ QStateMachine *QAbstractState::machine() const
     return d->machine();
 }
 
+/*!
+  Returns whether this state is active.
+
+  \sa activeChanged(bool), entered(), exited()
+*/
+bool QAbstractState::active() const
+{
+    Q_D(const QAbstractState);
+    return d->active;
+}
+
 /*!
   \fn QAbstractState::onExit(QEvent *event)
 
@@ -203,6 +231,15 @@ QStateMachine *QAbstractState::machine() const
   been called).
 */
 
+/*!
+  \fn QAbstractState::activeChanged(bool active)
+  \since 5.4
+
+  This signal is emitted when the active property is changed.
+
+  \sa QAbstractState::active, entered(), exited()
+*/
+
 /*!
   \reimp
 */

src/corelib/statemachine/qabstractstate.h

@@ -56,12 +56,15 @@ class QAbstractStatePrivate;
 class Q_CORE_EXPORT QAbstractState : public QObject
 {
     Q_OBJECT
+    Q_PROPERTY(bool active READ active NOTIFY activeChanged)
 public:
     ~QAbstractState();
 
     QState *parentState() const;
     QStateMachine *machine() const;
 
+    bool active() const;
+
 Q_SIGNALS:
     void entered(
 #if !defined(Q_QDOC)
@@ -73,6 +76,7 @@ Q_SIGNALS:
       QPrivateSignal
 #endif
     );
+    void activeChanged(bool active);
 
 protected:
     QAbstractState(QState *parent = 0);

src/corelib/statemachine/qabstractstate_p.h

@@ -85,8 +85,9 @@ public:
     void emitEntered();
     void emitExited();
 
-    uint stateType:31;
+    uint stateType:30;
     uint isMachine:1;
+    bool active:1;
     mutable QState *parentState;
 };
 

src/corelib/statemachine/qstatemachine.cpp

@@ -1369,6 +1369,11 @@ void QStateMachinePrivate::_q_start()
 {
     Q_Q(QStateMachine);
     Q_ASSERT(state == Starting);
+    foreach (QAbstractState *state, configuration) {
+        QAbstractStatePrivate *abstractStatePrivate = QAbstractStatePrivate::get(state);
+        abstractStatePrivate->active = false;
+        emit state->activeChanged(false);
+    }
     configuration.clear();
     qDeleteAll(internalEventQueue);
     internalEventQueue.clear();