From ea5123cb6b30d5ab083ee3821269537b1d31b9f0 Mon Sep 17 00:00:00 2001
From: "Javier S. Pedro" <maemo@javispedro.com>
Date: Sun, 5 May 2013 00:21:21 +0200
Subject: reduce the number of qdeclarativeengine instances

---
 libsowatch/declarativewatchlet.cpp | 34 +++++++++++++++++++++-------------
 libsowatch/declarativewatchlet.h   |  5 ++++-
 libsowatch/watchlet.h              |  8 ++++----
 3 files changed, 29 insertions(+), 18 deletions(-)

diff --git a/libsowatch/declarativewatchlet.cpp b/libsowatch/declarativewatchlet.cpp
index 32ff8e8..7e3ac53 100644
--- a/libsowatch/declarativewatchlet.cpp
+++ b/libsowatch/declarativewatchlet.cpp
@@ -31,20 +31,28 @@ DeclarativeWatchlet::DeclarativeWatchlet(WatchServer* server, const QString& id)
 		_registered = true;
 	}
 
-	// TODO: Share a single engine per watch server instead of this.
-	_engine = new QDeclarativeEngine(this);
-#if !defined(QT_NO_DEBUG)
-	QString qmlDir = QDir::current().absoluteFilePath(SOWATCH_QML_DIR);
-	qDebug() << "Using debug QML import path: " << qmlDir;
-	_engine->addImportPath(SOWATCH_QML_DIR);
-#else
-	_engine->addImportPath(SOWATCH_QML_DIR);
-#endif
+	// A dynamic property on the WatchServer object is used to share a single
+	// DeclarativeEngine amongst all DeclarativeWatchlet instances.
+	QVariant serverEngine = server->property("declarativeEngine");
+	if (!serverEngine.isValid()) {
+		// Create the shared engine
+		qDebug() << "Starting QDeclarativeEngine";
+		_engine = new QDeclarativeEngine(server);
+		_engine->addImportPath(SOWATCH_QML_DIR);
+
+		// Set context properties that are shared by all watchlets here
+		_engine->rootContext()->setContextProperty("notifications",
+			const_cast<NotificationsModel*>(server->notifications()));
+
+		server->setProperty("declarativeEngine", QVariant::fromValue(_engine));
+	} else {
+		_engine = serverEngine.value<QDeclarativeEngine*>();
+	}
+
+	_context = new QDeclarativeContext(_engine, this);
 
 	_wrapper = new DeclarativeWatchWrapper(server, server->watch(), this);
-	_engine->rootContext()->setContextProperty("watch", _wrapper);
-	_engine->rootContext()->setContextProperty("notifications",
-	                                           const_cast<NotificationsModel*>(server->notifications()));
+	_context->setContextProperty("watch", _wrapper);
 }
 
 DeclarativeWatchlet::~DeclarativeWatchlet()
@@ -140,7 +148,7 @@ void DeclarativeWatchlet::handleComponentStatus(QDeclarativeComponent::Status st
 		/* Nothing to do */
 		break;
 	case QDeclarativeComponent::Ready:
-		obj = _component->create();
+		obj = _component->create(_context);
 		if (_component->isError()) {
 			qWarning() << "QML has errors found while creating:";
 			qWarning() <<  _component->errors();
diff --git a/libsowatch/declarativewatchlet.h b/libsowatch/declarativewatchlet.h
index 087387a..28b16a8 100644
--- a/libsowatch/declarativewatchlet.h
+++ b/libsowatch/declarativewatchlet.h
@@ -17,7 +17,7 @@ class SOWATCH_EXPORT DeclarativeWatchlet : public GraphicsWatchlet
 {
     Q_OBJECT
 public:
-	explicit DeclarativeWatchlet(WatchServer* server, const QString& id);
+	DeclarativeWatchlet(WatchServer* server, const QString& id);
 	~DeclarativeWatchlet();
 
 	void setSource(const QUrl& url);
@@ -35,6 +35,7 @@ private:
 
 	static bool _registered;
 	QDeclarativeEngine* _engine;
+	QDeclarativeContext *_context;
 	QDeclarativeComponent* _component;
 	QDeclarativeItem* _item;
 	DeclarativeWatchWrapper* _wrapper;
@@ -45,4 +46,6 @@ private slots:
 
 }
 
+Q_DECLARE_METATYPE(QDeclarativeEngine*)
+
 #endif // SOWATCH_DECLARATIVEWATCHLET_H
diff --git a/libsowatch/watchlet.h b/libsowatch/watchlet.h
index f442086..66ec874 100644
--- a/libsowatch/watchlet.h
+++ b/libsowatch/watchlet.h
@@ -14,11 +14,11 @@ class SOWATCH_EXPORT Watchlet : public QObject
 {
     Q_OBJECT
 	Q_PROPERTY(QString id READ id CONSTANT)
-	Q_PROPERTY(bool isActive READ isActive NOTIFY activeChanged)
+	Q_PROPERTY(bool active READ isActive NOTIFY activeChanged)
 
 public:
-	explicit Watchlet(WatchServer *server, const QString& id);
-	virtual ~Watchlet();
+	Watchlet(WatchServer *server, const QString& id);
+	~Watchlet();
 
 	WatchServer* server();
 	Watch* watch();
@@ -26,7 +26,7 @@ public:
 	const WatchServer* server() const;
 	const Watch* watch() const;
 
-	Q_INVOKABLE QString id() const;
+	QString id() const;
 	bool isActive() const;
 
 signals:
-- 
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