QPPromise::QPPromise(QObject* parent)
: QObject(parent) {
if (engine == nullptr) {
engine = qmlEngine(parent);
if (engine == nullptr)
qFatal("Could not infer QML engine. Please call setEngine()");
qWarning() << "Inferring QML engine pointer -- to squelch this warning, call QPPromise::setEngine() prior to "
"creating any QPPromise objects.";
}
QQmlComponent promiserComponent(engine);
promiserComponent.setData("import QuickPromise 1.0\nPromise {}", QUrl());
internalPromise = promiserComponent.create();
internalPromise->setParent(this);
connect(internalPromise, SIGNAL(fulfilled(QVariant)), this, SIGNAL(fulfilled(QVariant)));
connect(internalPromise, SIGNAL(rejected(QVariant)), this, SIGNAL(rejected(QVariant)));
connect(internalPromise, SIGNAL(settled(QVariant)), this, SIGNAL(settled(QVariant)));
}
QmlPromise::QmlPromise(QObject* parent)
: QObject(parent) {
auto engine = qmlEngine(parent);
if (engine == nullptr)
qFatal("Could not find QML engine. Unable to continue.");
QQmlComponent promiserComponent(qmlEngine(parent));
promiserComponent.setData("import QuickPromise 1.0\nPromise {}", QUrl());
internalPromise = promiserComponent.create();
QQmlEngine::setObjectOwnership(internalPromise, QQmlEngine::JavaScriptOwnership);
connect(internalPromise, &QObject::destroyed, this, [this] {
// Probably won't happen often, if ever, but if it does it could provide useful insights vis a vis debugging
qDebug() << "Promise{} was garbage collected while QmlPromise still valid";
internalPromise = nullptr;
});
connect(internalPromise, SIGNAL(fulfilled(QVariant)), this, SIGNAL(fulfilled(QVariant)));
connect(internalPromise, SIGNAL(rejected(QVariant)), this, SIGNAL(rejected(QVariant)));
connect(internalPromise, SIGNAL(settled(QVariant)), this, SIGNAL(settled()));
connect(this, &QmlPromise::fulfilled, [this] { wasFulfilled = true; });
connect(this, &QmlPromise::rejected, [this] { wasRejected = true; });
}
