Emit a notifications when defaultState and historyType are changed.

In order to properly use QHistoryState object in QML we need to know
when these properties are changed.

Change-Id: I28c783436410c84bc64a919ac18c183f7a5eb9ad
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Volker Krause <volker.krause@kdab.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

1 files changed, 26 insertions, 2 deletions

diff --git a/src/corelib/statemachine/qhistorystate.cpp b/src/corelib/statemachine/qhistorystate.cpp
index 65ac2a77a0..1706d86afd 100644
--- a/src/corelib/statemachine/qhistorystate.cpp
+++ b/src/corelib/statemachine/qhistorystate.cpp
@@ -181,7 +181,10 @@ void QHistoryState::setDefaultState(QAbstractState *state)
                  "to this history state's group (%p)", state, parentState());
         return;
     }
-    d->defaultState = state;
+    if (d->defaultState != state) {
+        d->defaultState = state;
+        emit defaultStateChanged(QHistoryState::QPrivateSignal());
+    }
 }
 
 /*!
@@ -199,7 +202,10 @@ QHistoryState::HistoryType QHistoryState::historyType() const
 void QHistoryState::setHistoryType(HistoryType type)
 {
     Q_D(QHistoryState);
-    d->historyType = type;
+    if (d->historyType != type) {
+        d->historyType = type;
+        emit historyTypeChanged(QHistoryState::QPrivateSignal());
+    }
 }
 
 /*!
@@ -226,6 +232,24 @@ bool QHistoryState::event(QEvent *e)
     return QAbstractState::event(e);
 }
 
+/*!
+  \fn QHistoryState::defaultStateChanged()
+  \since 5.4
+
+  This signal is emitted when the defaultState property is changed.
+
+  \sa QHistoryState::defaultState
+*/
+
+/*!
+  \fn QHistoryState::historyTypeChanged()
+  \since 5.4
+
+  This signal is emitted when the historyType property is changed.
+
+  \sa QHistoryState::historyType
+*/
+
 QT_END_NAMESPACE
 
 #endif //QT_NO_STATEMACHINE