QQuickWidget“关闭”信号

Question

当QQuickWidget关闭时，它会告诉我什么信号？

例如，我编写了以下代码：

QQuickWidget *view = new QQuickWidget;
view->setSource(QUrl::fromLocalFile("main.qml"));
view->show();

我在main.qml文件中有一个ApplicationWindow，我想在qml窗口关闭后立即执行一些代码。

Answer 1

解决方案是实现一个注入到QML中的Helper，并在窗口关闭时通知我们：

class Helper: public QObject{
    Q_OBJECT
public:
    using QObject::QObject;
Q_SIGNALS:
    void closed();
};

Helper *helper = new Helper;
QObject::connect(helper, &Helper::closed, [](){
   qDebug() << "closed";
});

QQuickWidget *view = new QQuickWidget;
view->rootContext()->setContextProperty("helper", helper);
view->setSource(QUrl::fromLocalFile("main.qml"));
view->show();

ApplicationWindow {
    // ...
    onClosing: helper.closed()
}