How to pass QList from QML to C++/Qt? - c++

Question

I'm trying to pass QList of integer from QML to C++ code, but somehow my approach is not working. With below approach am getting following error:
left of '->setParentItem' must point to class/struct/union/generic type
type is 'int *'
Any inputs to trouble shoot the issue is highly appreciated
Below is my code snippet
Header file
Q_PROPERTY(QDeclarativeListProperty<int> enableKey READ enableKey)
QDeclarativeListProperty<int> enableKey(); //function declaration
QList<int> m_enableKeys;
cpp file
QDeclarativeListProperty<int> KeyboardContainer::enableKey()
{
return QDeclarativeListProperty<int>(this, 0, &KeyboardContainer::append_list);
}
void KeyboardContainer::append_list(QDeclarativeListProperty<int> *list, int *key)
{
int *ptrKey = qobject_cast<int *>(list->object);
if (ptrKey) {
key->setParentItem(ptrKey);
ptrKey->m_enableKeys.append(key);
}
}

Answer 1

You CAN'T use QDeclarativeListProperty (or QQmlListProperty in Qt5) with any other type than QObject derived ones. So int or QString will NEVER work.
If you need to exchange a QStringList or a QList or anything that is an array of one of the basic types supported by QML, the easiest way to do it is to use QVariant on the C++ side, like this :
#include <QObject>
#include <QList>
#include <QVariant>
class KeyboardContainer : public QObject {
Q_OBJECT
Q_PROPERTY(QVariant enableKey READ enableKey
WRITE setEnableKey
NOTIFY enableKeyChanged)
public:
// Your getter method must match the same return type :
QVariant enableKey() const {
return QVariant::fromValue(m_enableKey);
}
public slots:
// Your setter must put back the data from the QVariant to the QList<int>
void setEnableKey (QVariant arg) {
m_enableKey.clear();
foreach (QVariant item, arg.toList()) {
bool ok = false;
int key = item.toInt(&ok);
if (ok) {
m_enableKey.append(key);
}
}
emit enableKeyChanged ();
}
signals:
// you must have a signal named <property>Changed
void enableKeyChanged();
private:
// the private member can be QList<int> for convenience
QList<int> m_enableKey;
};
On the QML side, simply affect a JS array of Number, the QML engine will automatically convert it to QVariant to make it comprehensible to Qt :
KeyboardContainer.enableKeys = [12,48,26,49,10,3];
That's all !