Hi,
I cannot reproduce your issue, using Qt 5.3
Here is my code:
listprop.pro:
@
QT += qml quick
SOURCES += main.cpp
HEADERS += ListPropTest.h
FILES += test.qml
TARGET=listprop
@
ListPropTest.h:
@
#ifndef LISTPROPTEST_H
#define LISTPROPTEST_H
#include <QObject>
#include <QVariant>
#include <QQmlListReference>
#include <QtDebug>
class ListPropTest : public QObject
{
Q_OBJECT
Q_PROPERTY(QVariant listRef READ listRef WRITE setListRef NOTIFY listRefChanged)
public:
ListPropTest(QObject *parent = 0) : QObject(parent) {}
Q_INVOKABLE void doTest(const QVariant &listprop) {
m_listref = listprop.value<QQmlListReference>();
for (int i = m_listref.count() - 1; i >= 0; --i) {
qDebug() << "CPP: new list: " << m_listref.at(i);
}
emit listRefChanged();
}
QVariant listRef() const {
return QVariant::fromValue<QQmlListReference>(m_listref);
}
void setListRef(const QVariant &listprop) {
doTest(listprop);
}
Q_SIGNALS:
void listRefChanged();
private:
QQmlListReference m_listref;
};
#endif
@
main.cpp:
@
#include <QtGui/QGuiApplication>
#include <QQmlContext>
#include <QQmlEngine>
#include <QQuickView>
#include <qqml.h>
#include <QtDebug>
#include "ListPropTest.h"
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
QQuickView viewer;
ListPropTest test;
viewer.engine()->rootContext()->setContextProperty("listPropTest", &test);
viewer.setSource(QStringLiteral("test.qml"));
viewer.show();
return app.exec();
}
@
test.qml
@
import QtQuick 2.0
Item {
id: root
property list<QtObject> objectsA: [
QtObject { id: aOne; objectName: "aOne" },
QtObject { id: aTwo; objectName: "aTwo" }
]
property list<QtObject> objectsB: [
QtObject { id: bOne; objectName: "bOne" },
QtObject { id: bTwo; objectName: "bTwo" }
]
onObjectsAChanged: {
console.log("ObjectsA Changed!")
for (var a in objectsA) {
console.log(objectsA[a])
}
}
onObjectsBChanged: {
console.log("ObjectsB Changed!")
for (var b in objectsB) {
console.log(objectsB[b])
}
}
Timer {
running: true
interval: 2000
repeat: true
property int triggerCount: 0
onTriggered: {
triggerCount++
if (triggerCount == 1) {
listPropTest.listRef = objectsA //or: listPropTest.doTest(objectsA)
} else if (triggerCount == 2) {
listPropTest.listRef = objectsB //or: listPropTest.doTest(objectsB)
// check that objectsA is still valid, not cleared
for (var a in objectsA) console.log("QML: old list: " + objectsA[a])
} else {
// ensure that there was no delete-later style delayed deletion
for (var a in objectsA) console.log("QML: old list: " + objectsA[a])
repeat = false; running = false;
}
}
}
}
@
After running for 6 seconds, the objects in the objectsA list remain valid and not deleted. Perhaps the object which you reference the list property from somehow goes out of scope or otherwise gets deleted, rendering the list property invalid?
Cheers,
Chris.
