QtScript Binding problem with QWidget

[zack]

I want to add a QWidget for QtScript.

But unfortunately when I debug my protoype, I get no calls to my properties. And also all other properties from a QWidget are visible and accessible (I can see this, because I use the QtScript debugger)

I do it like the following code:

class WidgetPrototype : public QObject, protected QScriptable
{
    Q_OBJECT
 
    Q_PROPERTY(QString whatsThis READ whatsThis WRITE setWhatsThis)
    Q_PROPERTY(QString toolTip READ toolTip WRITE setToolTip)
 
	public:
		WidgetPrototype(QObject *parent = 0);
 
		QString whatsThis() const;
		void setWhatsThis(const QString &text) const;
		QString toolTip() const;
		void setToolTip(const QString &text) const;
 
	static QScriptValue construct(QScriptContext *ctx, QScriptEngine *eng);
 
	private:
		QWidget *thisWidget() const;
};

class WidgetPrototype : public QObject, protected QScriptable
{
    Q_OBJECT

    Q_PROPERTY(QString whatsThis READ whatsThis WRITE setWhatsThis)
    Q_PROPERTY(QString toolTip READ toolTip WRITE setToolTip)
   
	public:
		WidgetPrototype(QObject *parent = 0);

		QString whatsThis() const;
		void setWhatsThis(const QString &text) const;
		QString toolTip() const;
		void setToolTip(const QString &text) const;
		
	static QScriptValue construct(QScriptContext *ctx, QScriptEngine *eng);

	private:
		QWidget *thisWidget() const;
};

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Q_DECLARE_METATYPE(QWidget*)
 
WidgetPrototype::WidgetPrototype(QObject *parent)
:	QObject(parent)
{
 
}
 
QScriptValue WidgetPrototype::construct(QScriptContext *ctx, QScriptEngine *eng)
 {
	if(ctx->argumentCount()==0)
	{
		return eng->toScriptValue(new QWidget());
	}
 
	 return QScriptValue();
 }
 
QString WidgetPrototype::whatsThis() const
{
	if(thisWidget())
		return thisWidget()->whatsThis();
	else
		return "";
}
 
void WidgetPrototype::setWhatsThis(const QString &text) const
{
	if(thisWidget())
		thisWidget()->setWhatsThis(text);
}
 
QString WidgetPrototype::toolTip() const
{
	if(thisWidget())
		return thisWidget()->toolTip();
	else
		return "";
}
 
void WidgetPrototype::setToolTip(const QString &text) const
{
	if(thisWidget())
		thisWidget()->setToolTip(text);
}
 
QWidget *WidgetPrototype::thisWidget() const
{
	return qscriptvalue_cast<QWidget*>(thisObject());		
}

Q_DECLARE_METATYPE(QWidget*)

WidgetPrototype::WidgetPrototype(QObject *parent)
:	QObject(parent)
{
	
}
 
QScriptValue WidgetPrototype::construct(QScriptContext *ctx, QScriptEngine *eng)
 {
	if(ctx->argumentCount()==0)
	{
		return eng->toScriptValue(new QWidget());
	}
	
	 return QScriptValue();
 }
 
QString WidgetPrototype::whatsThis() const
{
	if(thisWidget())
		return thisWidget()->whatsThis();
	else
		return "";
}

void WidgetPrototype::setWhatsThis(const QString &text) const
{
	if(thisWidget())
		thisWidget()->setWhatsThis(text);
}

QString WidgetPrototype::toolTip() const
{
	if(thisWidget())
		return thisWidget()->toolTip();
	else
		return "";
}

void WidgetPrototype::setToolTip(const QString &text) const
{
	if(thisWidget())
		thisWidget()->setToolTip(text);
}

QWidget *WidgetPrototype::thisWidget() const
{
	return qscriptvalue_cast<QWidget*>(thisObject());		
}

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I create the binding with QtScript engine:

WidgetPrototype WidgetProtoObject();
 
	QScriptValue widgetProto = engine.newQObject(&WidgetProtoObject);
	engine.setDefaultPrototype(qMetaTypeId<QWidget*>(), widgetProto);
	QScriptValue widgetCtor = engine.newFunction(WidgetProtoObject.construct, widgetProto);
	engine.globalObject().setProperty("Widget", widgetCtor);

WidgetPrototype WidgetProtoObject();

	QScriptValue widgetProto = engine.newQObject(&WidgetProtoObject);
	engine.setDefaultPrototype(qMetaTypeId<QWidget*>(), widgetProto);
	QScriptValue widgetCtor = engine.newFunction(WidgetProtoObject.construct, widgetProto);
	engine.globalObject().setProperty("Widget", widgetCtor);

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var tem = new Widget();
tem.whatsThis="asdcvbs";
print(tem.whatsThis); // the script engine prints out "asdcvbs", but no from my whatsThis function in WidgetPrototype
print(tem.isActiveWindow); // I didnt add a slot for this property, but I get no mistake

var tem = new Widget();
tem.whatsThis="asdcvbs";
print(tem.whatsThis); // the script engine prints out "asdcvbs", but no from my whatsThis function in WidgetPrototype
print(tem.isActiveWindow); // I didnt add a slot for this property, but I get no mistake

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Does anybody know where the mistake is?

[seneca]

One difference to my working prototypes is the constructor. Translated to your class it would be:

QScriptValue WidgetPrototype::construct(QScriptContext *ctx, QScriptEngine *eng)
 {
    if(ctx->argumentCount()==0)
    {
        // use newQObject; script ownership
        return eng->newQObject(new QWidget(), QScriptEngine::ScriptOwnership);
    }
 
     return eng->undefinedValue();
 }

QScriptValue WidgetPrototype::construct(QScriptContext *ctx, QScriptEngine *eng)
 {
    if(ctx->argumentCount()==0)
    {
        // use newQObject; script ownership
        return eng->newQObject(new QWidget(), QScriptEngine::ScriptOwnership);
    }
    
     return eng->undefinedValue();
 }

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Other differences:

// prototype object not on stack:
WidgetPrototype* WidgetPrototypeObject =  new WidgetPrototype();
 
// make it script owned:
QScriptValue widgetProto = engine.newQObject(WidgetPrototypeObject, QScriptEngine::ScriptOwnership);
 
engine.setDefaultPrototype(qMetaTypeId<QWidget*>(), widgetProto);
QScriptValue widgetCtor = engine.newFunction(WidgetPrototype::construct, widgetProto);
engine.globalObject().setProperty("Widget", widgetCtor);

// prototype object not on stack:
WidgetPrototype* WidgetPrototypeObject =  new WidgetPrototype();
 
// make it script owned:
QScriptValue widgetProto = engine.newQObject(WidgetPrototypeObject, QScriptEngine::ScriptOwnership);

engine.setDefaultPrototype(qMetaTypeId<QWidget*>(), widgetProto);
QScriptValue widgetCtor = engine.newFunction(WidgetPrototype::construct, widgetProto);
engine.globalObject().setProperty("Widget", widgetCtor);

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[zack]

Did you test you WidgetProtoype with the QtScriptDebugger?

With your changes I have still all properties of a QWidget available and it does not call my prototype functions, when I call e.g. setWhatsThis()..

[seneca]

I didn't test your class, but mine work as expected.

Wild guess, would this maybe make a difference:

var tem = new Widget;

var tem = new Widget;

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