IOT dashboard: support key events for cube switching

Resolves #222

examples/iotdashboard/MainItem.cpp

@@ -193,6 +193,31 @@ void Cube::switchToPosition( const Position position )
     doSwitch( direction, nextPosition );
 }
 
+void Cube::keyPressEvent( QKeyEvent* event )
+{
+    Qsk::Direction direction;
+
+    switch( event->key() )
+    {
+    case Qt::Key_Up:
+        direction = Qsk::TopToBottom;
+        break;
+    case Qt::Key_Down:
+        direction = Qsk::BottomToTop;
+        break;
+    case Qt::Key_Left:
+        direction = Qsk::LeftToRight;
+        break;
+    case Qt::Key_Right:
+        direction = Qsk::RightToLeft;
+        break;
+    default:
+        return;
+    }
+
+    switchPosition( direction );
+}
+
 Cube::Position Cube::currentPosition() const
 {
     return static_cast< Position >( currentIndex() );
@@ -275,6 +300,8 @@ MainItem::MainItem( QQuickItem* parent )
 
     // the current item needs to be the one at the Front:
     m_cube->setCurrentItem( dashboardPage );
+
+    installEventFilter( this );
 }
 
 void MainItem::gestureEvent( QskGestureEvent* event )
@@ -301,6 +328,19 @@ void MainItem::gestureEvent( QskGestureEvent* event )
     }
 }
 
+bool MainItem::eventFilter( QObject* object, QEvent* event )
+{
+    if ( event->type() == QEvent::KeyPress )
+    {
+        QCoreApplication::sendEvent( m_cube, event );
+        return true;
+    }
+    else
+    {
+        return QObject::eventFilter( object, event );
+    }
+}
+
 bool MainItem::gestureFilter( QQuickItem* item, QEvent* event )
 {
     auto& recognizer = m_panRecognizer;

examples/iotdashboard/MainItem.h

@@ -45,6 +45,9 @@ class Cube : public QskStackBox
         // might be different from indexChanged:
         void cubeIndexChanged( const int index );
 
+    protected:
+        void keyPressEvent( QKeyEvent* event ) override;
+
     private:
         Position currentPosition() const;
         Position neighbor( const Position position, const Qsk::Direction direction ) const;
@@ -68,6 +71,7 @@ class MainItem : public QskControl
         MainItem( QQuickItem* parent = nullptr );
 
     protected:
+        bool eventFilter(QObject *obj, QEvent *event) override final;
         bool gestureFilter( QQuickItem*, QEvent* ) override final;
         void gestureEvent( QskGestureEvent* ) override final;