Custom QObjet in QScript

[Ben1]

What I need if I want to use my own class (no a Qt class)

example :

class MyObj
{
    MyObj();
   ~ MyObj();
   void calculate() { 3 + 5;}
}

class MyObj
{
    MyObj();
   ~ MyObj();
   void calculate() { 3 + 5;}
}

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I just have to use Q_SCRIPT_DECLARE_QMETAOBJECT(MyObj, QObject*) and

int main(int argc, char **argv){
QApplication app(argc, argv);
QScriptEngine engine;
QScriptValue MyObjClass = engine.scriptValueFromQMetaObject<MyObj>();
engine.globalObject().setProperty("MyObj", MyObjClass );
QScriptValue val = engine.evaluate("var le = new MyObj; le.calculate();");
if(val.isError())
     qDebug() << val.toString();
app.exec();
}

int main(int argc, char **argv){
QApplication app(argc, argv);
QScriptEngine engine;
QScriptValue MyObjClass = engine.scriptValueFromQMetaObject<MyObj>();
engine.globalObject().setProperty("MyObj", MyObjClass );
QScriptValue val = engine.evaluate("var le = new MyObj; le.calculate();");
if(val.isError())
     qDebug() << val.toString();
app.exec();
}

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It's just to be sure what I can do.

[wysota]

First you can open the docs and read why QScriptEngine::scriptValueFromQMetaObject() is not suitable for your MyObj class.

class MyObj : public QObject {
  Q_OBJECT
public:
  MyObj(){}
  ~MyObj(){}
public slots:
  void calculate() { qDebug() << Q_FUNC_INFO; }
};
 
#include "main.moc"
 
int main(int argc, char **argv){
  QScriptEngine engine;
  QScriptValue MyObjClass = engine.scriptValueFromQMetaObject<MyObj>();
  engine.globalObject().setProperty("MyObj", MyObjClass );
  QScriptValue val = engine.evaluate("var le = new MyObj; le.calculate();");
  if(val.isError())
     qDebug() << val.toString();
}

class MyObj : public QObject {
  Q_OBJECT
public:
  MyObj(){}
  ~MyObj(){}
public slots:
  void calculate() { qDebug() << Q_FUNC_INFO; }
};

#include "main.moc"

int main(int argc, char **argv){
  QScriptEngine engine;
  QScriptValue MyObjClass = engine.scriptValueFromQMetaObject<MyObj>();
  engine.globalObject().setProperty("MyObj", MyObjClass );
  QScriptValue val = engine.evaluate("var le = new MyObj; le.calculate();");
  if(val.isError())
     qDebug() << val.toString();
}

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or use QScriptClass or QScriptable to avoid QObject legacy. You can also use one of the prototype based approaches, i.e.:

QScriptValue MyObj_ctor(QScriptContext *context, QScriptEngine *engine) {
  return engine->undefinedValue();
}
 
QScriptValue MyObj_prototype_calculate(QScriptContext *context, QScriptEngine *engine)
 {
  qDebug() << "calculate";
   return engine->undefinedValue();
 }
 
 // ...
 
QScriptEngine engine;
QScriptValue ctor = engine.newFunction(MyObj_ctor);
ctor.property("prototype").setProperty("calculate", engine.newFunction(MyObj_prototype_calculate));
QScriptValue global = engine.globalObject();
global.setProperty("MyObj", ctor);

QScriptValue MyObj_ctor(QScriptContext *context, QScriptEngine *engine) {
  return engine->undefinedValue();
}

QScriptValue MyObj_prototype_calculate(QScriptContext *context, QScriptEngine *engine)
 {
  qDebug() << "calculate";
   return engine->undefinedValue();
 }

 // ...

QScriptEngine engine;
QScriptValue ctor = engine.newFunction(MyObj_ctor);
ctor.property("prototype").setProperty("calculate", engine.newFunction(MyObj_prototype_calculate));
QScriptValue global = engine.globalObject();
global.setProperty("MyObj", ctor);

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What you choose depends on how you intend to use the class.

[Ben1]

The problem is I don't really know how to use my class. I try to provide a framework that can be used by users who can write QtScript using this framework.

[wysota]

The problem is I don't really know how to use my class.

I don't know how to use your class too. You'll probably be the first to know how to use your class. If not then it's probably not a good idea to dwell about the problem at all.