C++ 基于Qt:：ApplicationState的暂停Qt场景图绘制

我正在尝试在android上的Qt应用程序中暂停渲染，将其置于后台。初始状态更改后，由于没有更新到达连接，应用程序被卡住

QScopedPointer<QQuickWindow> window ... 

QSemaphore renderSemaphore(1);
bool releaseOnRender {};

QObject::connect(window.data(), &QQuickWindow::beforeRendering,
    qApp, [&] {
        releaseOnRender = renderSemaphore.tryAcquire(1, -1);
    }, Qt::DirectConnection);

QObject::connect(window.data(), &QQuickWindow::afterRendering,
    qApp, [&] {
        if (releaseOnRender) {
            renderSemaphore.release(1);
        }
    }, Qt::DirectConnection);

Qt::ApplicationState prevApplicationState = Qt::ApplicationState::ApplicationActive;

QObject::connect(qApp, &QGuiApplication::applicationStateChanged,
    qApp, [&] (Qt::ApplicationState state) {
        qDebug() << "Changed state to" << state;
        if (state != prevApplicationState) {
            if (state == Qt::ApplicationState::ApplicationSuspended) {
                renderSemaphore.acquire(1);
                qDebug() << "Freezing render";
            } else {
                renderSemaphore.release(1);
                qDebug() << "Releasing render";
            }
            prevApplicationState = state;
        }
    }, Qt::DirectConnection);

QScopedPointer窗口。。。
QSemaphore renderSemaphore（1）；
布尔释放渲染{}；
QObject:：connect（window.data（），&QQuickWindow:：在呈现之前，
qApp，[&]{
releaseOnRender=rendersemapphore.tryAcquire（1，-1）；
}，Qt:：DirectConnection）；
QObject:：connect（window.data（），&QQuickWindow:：afterRendering，
qApp，[&]{
如果（releaseOnRender）{
renderSemaphore.release（1）；
}
}，Qt:：DirectConnection）；
Qt:：ApplicationState prevApplicationState=Qt:：ApplicationState:：ApplicationActive；
QObject:：connect（qApp，&QGuiApplication:：applicationStateChanged，
qApp，[&]（Qt:：ApplicationState状态）{
qDebug（）