QGuiApplication::layoutDirectionChanged(Qt::LayoutDirection) [signal]

This allows QQuickApplication to listen to layout direction changes
without installing an expensive event filter on the application object.

Change-Id: I2d7d8906acecbc092657c4bd918bbdc9aad9744c
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

2 files changed, 8 insertions, 2 deletions

diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 5bbd5e709c..29ab7daca0 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -3077,6 +3077,8 @@ void QGuiApplicationPrivate::saveState()
     On system start-up, the default layout direction depends on the
     application's language.
 
+    The notifier signal was introduced in Qt 5.4.
+
     \sa QWidget::layoutDirection, isLeftToRight(), isRightToLeft()
  */
 
@@ -3087,7 +3089,10 @@ void QGuiApplication::setLayoutDirection(Qt::LayoutDirection direction)
 
     layout_direction = direction;
 
-    QGuiApplicationPrivate::self->notifyLayoutDirectionChange();
+    if (qGuiApp) {
+        emit qGuiApp->layoutDirectionChanged(direction);
+        QGuiApplicationPrivate::self->notifyLayoutDirectionChange();
+    }
 }
 
 Qt::LayoutDirection QGuiApplication::layoutDirection()
diff --git a/src/gui/kernel/qguiapplication.h b/src/gui/kernel/qguiapplication.h
index 50aefaadb5..560b2c827d 100644
--- a/src/gui/kernel/qguiapplication.h
+++ b/src/gui/kernel/qguiapplication.h
@@ -75,7 +75,7 @@ class Q_GUI_EXPORT QGuiApplication : public QCoreApplication
     Q_OBJECT
     Q_PROPERTY(QIcon windowIcon READ windowIcon WRITE setWindowIcon)
     Q_PROPERTY(QString applicationDisplayName READ applicationDisplayName WRITE setApplicationDisplayName)
-    Q_PROPERTY(Qt::LayoutDirection layoutDirection READ layoutDirection WRITE setLayoutDirection)
+    Q_PROPERTY(Qt::LayoutDirection layoutDirection READ layoutDirection WRITE setLayoutDirection NOTIFY layoutDirectionChanged)
     Q_PROPERTY(QString platformName READ platformName STORED false)
     Q_PROPERTY(bool quitOnLastWindowClosed  READ quitOnLastWindowClosed WRITE setQuitOnLastWindowClosed)
 
@@ -169,6 +169,7 @@ Q_SIGNALS:
     void focusObjectChanged(QObject *focusObject);
     void focusWindowChanged(QWindow *focusWindow);
     void applicationStateChanged(Qt::ApplicationState state);
+    void layoutDirectionChanged(Qt::LayoutDirection direction);
 #ifndef QT_NO_SESSIONMANAGER
     void commitDataRequest(QSessionManager &sessionManager);
     void saveStateRequest(QSessionManager &sessionManager);