QtScript: getting variable name which calls Qt/C++ slot out of QtScript
-
I have a QScriptEngine and some C++ Objects which I want (and can) create out of QtScript:
@
//Some C++ Object
class SomeObject() : public QObject, public QScriptable //QScriptable only needed for section ('How far I reached')
{
Q_Object
private:
...
...
public:
SomeObject() { //ctor
qDebug() << "A new SomeObject has been born!";
}
public slots:
void printMyScriptVarName() {
qDebug() << "yaaiy!";
}
...
signals:
...
...
}Q_DECLARE_METATYPE(SomeObject*)
Q_SCRIPT_DECLARE_QMETAOBJECT(SomeObject, QObject*)
@
@
// Setup of QScriptEngine
class MyScript
{
private:
QScriptEngine m_engine;public:
MyScript() {
QScriptValue scriptSomeObject = this->m_engine.scriptValueFromQMetaObject<SomeObject>();
this->m_engine.globalObject().setProperty("SomeObject", scriptSomeObject);
}public slots:
void evaluateCode(QString & code);
...
}
@With this setup I can execute the following QtScript Code:
@
//QtScript Code Example 1
var a = new SomeObject();
a.printMyScriptVarName();
@and get the output as suspected:
@
A new SomeObject has been born!
yaaiy!
@What I want to achieve:
Now, with the slot 'printMyScriptVarName()' I want to achieve, that I get the 'QtScript variable name' of that SomeObject object, I called from - which would be 'a' in the case of the 'QtScript code example 1' above, because of the line @var a = new SomeObject();@How far I reached:
I can get all variable names in my Script, which hold a reference to my SomeObject object with the following C++ code:
@
void SomeObject::printMyScriptVarName()
{
/* iterator will iterate over every element, which is in globalObject().. so are may variables I define at runtime */
QScriptValueIterator it( this->engine()->globalObject() );while (it.hasNext())
{
it.next();//examine only elements which are set to be enumeratable (hides some internal values) if (it.flags() & QScriptValue::SkipInEnumeration) continue; // try to cast the current script element to a SomeObject pointer A * pointer = qobject_cast<SomeObject*>( it.value().toQObject() ); // if casting has been successfull and is pointing at me... if (pointer && pointer == this) qDebug() << "var" << it.name() << "has a reference to me";}
}
@using the code base, I can evalutate QtScript code like this:
@
//QtScript code example 2
var a = new SomeObject();
var b = new SomeObject();
var c = a;
var d = b;b.printMyScriptVarName();
@and will get the output:
@
var 'b' has a reference to me
var 'd' has a reference to me
@Problem with my Solution:
I wanted to get the actual caller variable 'b' because variable 'b' calls my slot at line 7. And not all possibile callers (references).Has anyone an idea?