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Sourcecode: qt4-x11 version File versions

src.script.qscriptengine.cpp

//! [0]
    QScriptEngine myEngine;
    QScriptValue three = myEngine.evaluate("1 + 2");
//! [0]


//! [1]
    QScriptValue fun = myEngine.evaluate("function(a, b) { return a + b; }");
    QScriptValueList args;
    args << QScriptValue(&myEngine, 1) << QScriptValue(&myEngine, 2);
    QScriptValue threeAgain = fun.call(QScriptValue(), args);
//! [1]


//! [2]
  QString fileName = "helloworld.qs";
  QFile scriptFile(fileName);
  if (!scriptFile.open(QIODevice::ReadOnly))
      // handle error
  QTextStream stream(&scriptFile);
  QString contents = stream.readAll();
  scriptFile.close();
  myEngine.evaluate(contents, fileName);
//! [2]


//! [3]
    QScriptValue myNumber = QScriptValue(&myEngine, 123);
    myEngine.globalObject().setProperty("myNumber", myNumber);
    ...
    QScriptValue myNumberPlusOne = myEngine.evaluate("myNumber + 1");
//! [3]


//! [4]
    QScriptValue result = myEngine.evaluate(...);
    if (myEngine.hasUncaughtException()) {
        int line = myEngine.uncaughtExceptionLineNumber();
        qDebug() << "uncaught exception at line" << line << ":" << result.toString();
    }
//! [4]


//! [5]
  QPushButton button;
  QScriptValue scriptButton = myEngine.newQObject(&button);
  myEngine.globalObject().setProperty("button", scriptButton);

  myEngine.evaluate("button.checkable = true");

  qDebug() << scriptButton.property("checkable").toBoolean();
  scriptButton.property("show").call(); // call the show() slot
//! [5]


//! [6]
    QScriptValue myAdd(QScriptContext *context, QScriptEngine *engine)
    {
       QScriptValue a = context->argument(0);
       QScriptValue b = context->argument(1);
       return QScriptValue(engine, a.toNumber() + b.toNumber());
    }
//! [6]


//! [7]
    QScriptValue fun = myEngine.newFunction(myAdd);
    myEngine.globalObject().setProperty("myAdd", fun);
//! [7]


//! [8]
    QScriptValue result = myEngine.evaluate("myAdd(myNumber, 1)");
//! [8]


//! [9]
  QScriptValue Foo(QScriptContext *context, QScriptEngine *engine)
  {
      if (context->calledAsConstructor()) {
          // initialize the new object
          context->thisObject().setProperty("bar", ...);
          // ...
          // return a non-object value to indicate that the
          // thisObject() should be the result of the "new Foo()" expression
          return engine->undefinedValue();
      } else {
          // not called as "new Foo()", just "Foo()"
          // create our own object and return that one
          QScriptValue object = engine->newObject();
          object.setPrototype(context->callee().property("prototype"));
          object.setProperty("baz", ...);
          return object;
      }
  }

  ...

  QScriptValue fooProto = engine->newObject();
  fooProto.setProperty("whatever", ...);
  engine->globalObject().setProperty("Foo", engine->newFunction(Foo, fooProto));
//! [9]


//! [10]
00106   class Bar { ... };

  Q_DECLARE_METATYPE(Bar)

  QScriptValue constructBar(QScriptContext *context, QScriptEngine *engine)
  {
      Bar bar;
      // initialize from arguments in context, if desired
      ...
      return engine->toScriptValue(bar);
  }

  class BarPrototype : public QObject, public QScriptable
  {
  // provide the scriptable interface of this type using slots and properties
  ...
  };

  ...

  // create and register the Bar prototype and constructor in the engine
  BarPrototype *barPrototypeObject = new BarPrototype(...);
  QScriptValue barProto = engine->newQObject(barPrototypeObject);
  engine->setDefaultPrototype(qMetaTypeId<Bar>, barProto);
  QScriptValue barCtor = engine->newFunction(constructBar, barProto);
  engine->globalObject().setProperty("Bar", barCtor);
//! [10]


//! [11]
    static QScriptValue getSetFoo(QScriptContext *context, QScriptEngine *engine)
    {
        QScriptValue callee = context->callee();
        if (context->argumentCount() == 1) // writing?
            callee.setProperty("value", context->argument(0));
        return callee.property("value");
    }

    ....

    QScriptValue object = engine.newObject();
    object.setProperty("foo", engine.newFunction(getSetFoo),
        QScriptValue::PropertyGetter | QScriptValue::PropertySetter);
//! [11]


//! [12]
    QScriptValue object = engine.newObject();
    object.setProperty("foo", engine.newFunction(getFoo), QScriptValue::PropertyGetter);
    object.setProperty("foo", engine.newFunction(setFoo), QScriptValue::PropertySetter);
//! [12]


//! [13]
  Q_SCRIPT_DECLARE_QMETAOBJECT(QLineEdit, QWidget*)

  ...

  QScriptValue lineEditClass = engine.scriptValueFromQMetaObject<QLineEdit>();
  engine.globalObject().setProperty("QLineEdit", lineEditClass);
//! [13]


//! [14]
  if (hello && world)
    print("hello world");
//! [14]


//! [15]
  if (hello &&
//! [15]


//! [16]
  0 = 0
//! [16]


//! [17]
  ./test.js
//! [17]


//! [18]
  foo["bar"]
//! [18]


//! [19]
  QScriptEngine engine;
  QScriptContext *context = engine.pushContext();
  context->activationObject().setProperty("myArg", QScriptValue(&engine, 123));
  engine.evaluate("var tmp = myArg + 42");
  ...
  engine.popContext();
//! [19]


//! [20]
      struct MyStruct {
        int x;
        int y;
      };
//! [20]


//! [21]
      Q_DECLARE_METATYPE(MyStruct)
//! [21]


//! [22]
    QScriptValue toScriptValue(QScriptEngine *engine, const MyStruct &s)
    {
      QScriptValue obj = engine->newObject();
      obj.setProperty("x", QScriptValue(engine, s.x));
      obj.setProperty("y", QScriptValue(engine, s.y));
      return obj;
    }

    void fromScriptValue(const QScriptValue &obj, MyStruct &s)
    {
      s.x = obj.property("x").toInt32();
      s.y = obj.property("y").toInt32();
    }
//! [22]


//! [23]
    qScriptRegisterMetaType(engine, toScriptValue, fromScriptValue);
//! [23]


//! [24]
    MyStruct s = qscriptvalue_cast<MyStruct>(context->argument(0));
    ...
    MyStruct s2;
    s2.x = s.x + 10;
    s2.y = s.y + 20;
    QScriptValue v = engine->toScriptValue(s2);
//! [24]


//! [25]
    QScriptValue createMyStruct(QScriptContext *, QScriptEngine *engine)
    {
        MyStruct s;
        s.x = 123;
        s.y = 456;
        return engine->toScriptValue(s);
    }
    ...
    QScriptValue ctor = engine.newFunction(createMyStruct);
    engine.globalObject().setProperty("MyStruct", ctor);
//! [25]


//! [26]
    Q_DECLARE_METATYPE(QVector<int>)

    ...

    qScriptRegisterSequenceMetaType<QVector<int> >(engine);
    ...
    QVector<int> v = qscriptvalue_cast<QVector<int> >(engine->evaluate("[5, 1, 3, 2]"));
    qSort(v.begin(), v.end());
    QScriptValue a = engine->toScriptValue(v);
    qDebug() << a.toString(); // outputs "[1, 2, 3, 5]"
//! [26]

//! [27]
    QScriptValue mySpecialQObjectConstructor(QScriptContext *context,
                                             QScriptEngine *engine)
    {
        QObject *parent = context->argument(0).toQObject();
        QObject *object = new QObject(parent);
        return engine->newQObject(object, QScriptEngine::ScriptOwnership);
    }

    ...

    QScriptValue ctor = engine.newFunction(mySpecialQObjectConstructor);
    QScriptValue metaObject = engine.newQMetaObject(&QObject::staticMetaObject, ctor);
    engine.globalObject().setProperty("QObject", metaObject);

    QScriptValue result = engine.evaluate("new QObject()");
//! [27]


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