C++ JSObject::implementsCall方法代码示例

QVariant KJSObjectModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    Node *item = static_cast<Node*>(index.internalPointer());
    KJS::JSObject *instance = item->instance;

    if (role == Qt::DecorationRole )
    {
        if( instance->implementsConstruct() )
            return QPixmap(":/images/class.png");
        else if( instance->implementsCall() )
            return QPixmap(":/images/method.png");
        else
            return QPixmap(":/images/property.png");
    }
    if( role == Qt::TextColorRole )
    {
        if( instance->implementsConstruct() )
            return QColor("blue");
        else if( instance->implementsCall() )
            return QColor("green");
        else
            return QColor("black");
    }
    if (role == Qt::DisplayRole)
        return item->name;
    return QVariant();
}

KJS::JSValue *SlotProxy::callMethod(const QByteArray &methodName, void **_a)
{
#ifdef DEBUG_SLOTPROXY
    qDebug() << "SlotProxy::callMethod(" << methodName << ",_a) obj=" << this;
#endif
    KJS::ExecState *exec = m_interpreter->globalExec();
    exec->clearException();

    // Crash
    // KJS::Interpreter::globalExec()->context().thisValue()
    KJS::List args = convertArguments(exec, _a);
    KJS::Identifier id = KJS::Identifier(KJS::UString(methodName.data()));
    KJS::JSObject *fun = m_object->get(exec, id)->toObject(exec);
    KJS::JSValue *retValue;
    if (!fun->implementsCall()) {
#ifdef DEBUG_SLOTPROXY
        qDebug() << "SlotProxy::callMethod got bad handler";
#endif
        QString msg = i18n("Bad slot handler: Object %1 Identifier %2 Method %3 Signature: %4.",
                           m_object->className().ascii(),
                           id.ascii(),
                           methodName.data(),
                           QString(m_signature));

        retValue = throwError(exec, KJS::TypeError, msg);
    } else {
        retValue = fun->call(exec, m_object, args);
    }

    if (exec->hadException()) {
#ifdef DEBUG_SLOTPROXY
        qDebug() << "SlotProxy::callMethod had exception";
#endif
        if (m_interpreter->shouldPrintExceptions()) {
            KJS::JSLock lock;
            KJS::JSObject *exceptObj = exec->exception()->toObject(exec);//retValue->toObject(exec);
            QString message = toQString(exceptObj->toString(exec));
            QString sourceURL = toQString(exceptObj->get(exec, "sourceURL")->toString(exec));
            int sourceId = exceptObj->get(exec, "sourceId")->toUInt32(exec);
            // would include the line number, but it's always last line of file
            int line = exceptObj->get(exec, "line")->toUInt32(exec);
            (*KJSEmbed::conerr()) << i18n("Exception calling '%1' slot from %2:%3:%4", QString(methodName), !sourceURL.isEmpty() ? sourceURL : QString::number(sourceId), line, message) << endl;
        }

        // clear it so it doesn't stop other things
        exec->clearException();

        return KJS::jsNull();
    } else {
        if (retValue->type() == 1 || retValue->type() == 0) {
            return KJS::jsNull();
        }
    }
    return retValue;
}

bool EventProxy::callHandler( QEvent *e )
{
// Be careful enabling this as if there are a lot of events then the event loop times
// out and the app crashes with 'Alarm Clock'.
//    qDebug("JSObjectEventProxy::callHandler() event type %d" , e->type() );

    KJS::ExecState *exec = m_interpreter->globalExec();
    KJS::Identifier id = JSEventMapper::mapper()->findEventHandler( e->type() );

    KJS::JSObject *jsobj(m_watch);
    KJS::JSObject *fun = jsobj->get(exec, id )->toObject( exec );

    KJS::JSValue *retValue;
    if ( !fun->implementsCall() )
    {
        QString msg = i18n( "Bad event handler: Object %1 Identifier %2 Method %3 Type: %4.",
          jsobj->className().ascii(),
          id.ascii(),
          fun->className().ascii(),
          e->type());
        retValue = throwError(exec, KJS::TypeError, msg);
    }
    else
    {
        // Process args
        KJS::List args;
        args.append( JSEventUtils::event(exec, e) );
        
        // Call handler
        retValue = fun->call( exec, jsobj, args );
    }
    
    if ( exec->hadException() ) 
    {
        if (m_interpreter->shouldPrintExceptions())
        {
            KJS::JSLock lock;
            KJS::JSObject* exceptObj = retValue->toObject(exec);
            QString message = toQString(exceptObj->toString(exec));
            QString sourceURL = toQString(exceptObj->get(exec, "sourceURL")->toString(exec));
            int sourceId = exceptObj->get(exec, "sourceId")->toUInt32(exec);
            int line = exceptObj->get(exec, "line")->toUInt32(exec);
            (*KJSEmbed::conerr()) << i18n("Exception calling '%1' function from %2:%3:%4", id.ascii(), !sourceURL.isEmpty() ? sourceURL : QString::number(sourceId), line, message) << endl;
        }
        
        
        // clear it so it doesn't stop other things
        exec->clearException();
        return false;
    }
  
    return true;
}

NodeFilter* toNodeFilter(KJS::JSValue* val)
{
    if (!val || !val->isObject())
        return 0;

    if (val->isObject(&JSNodeFilter::info))
        return static_cast<JSNodeFilter*>(val)->impl();

    KJS::JSObject* o = static_cast<KJS::JSObject*>(val);
    if (o->implementsCall())
        return new NodeFilter(new JSNodeFilterCondition(o));

    return 0;
}

KJS::JSValue *Engine::callMethod(  KJS::JSObject *parent,
                                   const KJS::UString &methodName, const KJS::List &args )
{
    KJS::ExecState *exec = dptr->m_interpreter->globalExec();

    KJS::Identifier id = KJS::Identifier( methodName);
    KJS::JSObject *fun = parent->get( exec, id )->toObject( exec );
    KJS::JSValue *retValue;

    if ( !fun->implementsCall() ) {
        QString msg = i18n( "%1 is not a function and cannot be called.", toQString(methodName) );
        return throwError( exec, KJS::TypeError, msg );
    }

    retValue = fun->call( exec, parent, args );

    if( exec->hadException() )
        return exec->exception();

    return retValue;
}