Enums to QVariants and comparing those after the conversion.

[hickscorp]

Hello,

i am registering enums to the Qt meta-object system. i have double checked that all of those have a meta-type ID, and everything looks perfect. But i have some kind of unresolved issue with the comparison of those.

Let's consider this code for populating a combobox:

WgtEnumItemEditor::WgtEnumItemEditor (QVariant::Type t, QWidget *p)
: QComboBox(p) {
	QMetaObject const		&mo	= staticMetaObject;
	QString				mtName	= QMetaType::typeName(t);
	mtName							= mtName.mid(mtName.lastIndexOf(':')+1);
	qint32 const			iEnum	= mo.indexOfEnumerator(mtName.toLatin1());
	QMetaEnum const			&en	= mo.enumerator(iEnum);
	quint32 const			cEnum	= en.keyCount();
	for (quint32 i=0; i<cEnum; i++) {
		const char		*key	= en.key(i);
		uint const		val	= en.value(i);
		QVariant const		var	(t, &val);
		addItem				(classNameToNaturalString(key), var);
		qDebug() << var;
	}
	connect(this, SIGNAL(currentIndexChanged(int)), this, SLOT(this_currentIndexChanged(int)));
}

WgtEnumItemEditor::WgtEnumItemEditor (QVariant::Type t, QWidget *p)
: QComboBox(p) {
	QMetaObject const		&mo	= staticMetaObject;
	QString				mtName	= QMetaType::typeName(t);
	mtName							= mtName.mid(mtName.lastIndexOf(':')+1);
	qint32 const			iEnum	= mo.indexOfEnumerator(mtName.toLatin1());
	QMetaEnum const			&en	= mo.enumerator(iEnum);
	quint32 const			cEnum	= en.keyCount();
	for (quint32 i=0; i<cEnum; i++) {
		const char		*key	= en.key(i);
		uint const		val	= en.value(i);
		QVariant const		var	(t, &val);
		addItem				(classNameToNaturalString(key), var);
		qDebug() << var;
	}
	connect(this, SIGNAL(currentIndexChanged(int)), this, SLOT(this_currentIndexChanged(int)));
}

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It works good, my list gets populated with human readable texts for my enums.

Now, i'm trying to set the initial value displayed by the list with a QVariant itself containing a value for the enum:

void WgtEnumItemEditor::setValue (const QVariant &v) {
	for (quint32 i=0; i<count(); i++) {
		if (itemData(i)==v.data) {
			setCurrentIndex(i);
			break;
		}
	}
}

void WgtEnumItemEditor::setValue (const QVariant &v) {
	for (quint32 i=0; i<count(); i++) {
		if (itemData(i)==v.data) {
			setCurrentIndex(i);
			break;
		}
	}
}

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This piece of code doesn't work. i have to replace the test by:

*(uint*)itemData(i).data()==*(uint*)v.data()

*(uint*)itemData(i).data()==*(uint*)v.data()

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This way it works.

Can anyone explain me how to enable comparison of my custom enums in QVariants? Or am i doing something wrong while creating the QVariant being used as userdata for the list maybe?

Also, if i try to qDebug() the QVariants created in loop for populating the list, i get outputs like this:

QVariant(ReadingDirection, ) 
QVariant(ReadingDirection, )
QVariant(ReadingDirection, )
QVariant(ReadingDirection, )
QVariant(ReadingDirection, )
QVariant(BarcodeStandard, )
QVariant(BarcodeStandard, )
QVariant(BarcodeStandard, )

QVariant(ReadingDirection, ) 
QVariant(ReadingDirection, )
QVariant(ReadingDirection, )
QVariant(ReadingDirection, )
QVariant(ReadingDirection, )
QVariant(BarcodeStandard, )
QVariant(BarcodeStandard, )
QVariant(BarcodeStandard, )

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As you can see, the value isn't outputed correctly... Can you please help me find why?

Thanks,
Pierre.



Thank you,
Pierre.