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// w is your widget
QGraphicsOpacityEffect *eff = new QGraphicsOpacityEffect(this);
w->setGraphicsEffect(eff);
QPropertyAnimation *a = new QPropertyAnimation(eff,"opacity");
a->setDuration(350);
a->setStartValue(0);
a->setEndValue(1);
a->setEasingCurve(QEasingCurve::InBack);
a->start(QPropertyAnimation::DeleteWhenStopped);

// w is your widget
QGraphicsOpacityEffect *eff = new QGraphicsOpacityEffect(this);
w->setGraphicsEffect(eff);
QPropertyAnimation *a = new QPropertyAnimation(eff,"opacity");
a->setDuration(350);
a->setStartValue(1);
a->setEndValue(0);
a->setEasingCurve(QEasingCurve::OutBack);
a->start(QPropertyAnimation::DeleteWhenStopped);
connect(a,SIGNAL(finished()),this,SLOT(hideThisWidget()));
// now implement a slot called hideThisWidget() to do
// things like hide any background dimmer, etc.

Test::Test(QWidget *parent)
    : CustomMainWindow(parent)
    ui.setupUi(this);
    setShadow(ui.bg_app);
    connect(ui.close_app_btn, &QPushButton::clicked, this, &QWidget::close);
    connect(ui.minimize_app_btn, &QPushButton::clicked, this, &QWidget::showMinimized);
    QGraphicsOpacityEffect* eff = new QGraphicsOpacityEffect(this);
    ui.checking->setGraphicsEffect(eff); // checking is my widget inside of QStackedWidget.
    QPropertyAnimation* a = new QPropertyAnimation(eff, "opacity");
    a->setDuration(350);
    a->setStartValue(0);
    a->setEndValue(1);
    a->setEasingCurve(QEasingCurve::InBack);
    a->start(QPropertyAnimation::DeleteWhenStopped);
}

CustomMainWindow::CustomMainWindow(QWidget *parent)
    : QMainWindow(parent)
    setWindowFlags(windowFlags() | Qt::Window | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
    setAttribute(Qt::WA_TranslucentBackground);
void CustomMainWindow::setShadow(QWidget* window)
    QGraphicsDropShadowEffect* windowShadow = new QGraphicsDropShadowEffect;
    windowShadow->setBlurRadius(9.0);
    windowShadow->setColor(palette().color(QPalette::Highlight));
    windowShadow->setOffset(0.0);
    window->setGraphicsEffect(windowShadow);
}

//...
private slots:
    void animationStackedWidgets();
    void whenAnimationFinish();
//....

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    ui->setupUi(this);
    connect(ui->button, &QPushButton::clicked, this, &MainWindow::animationStackedWidgets);
MainWindow::~MainWindow()
    delete ui;
void MainWindow::animationStackedWidgets()
    QGraphicsOpacityEffect *effect = new QGraphicsOpacityEffect(this);
    ui->stackedWidget->setGraphicsEffect(effect);
    QPropertyAnimation *anim = new QPropertyAnimation(effectSw,"opacity");
    anim->setDuration(350);
    anim->setStartValue(0);
    anim->setEndValue(1);
    anim->setEasingCurve(QEasingCurve::InBack);
    anim->start(QPropertyAnimation::DeleteWhenStopped);
    connect(anim, SIGNAL(finished()), this, SLOT(whenAnimationFinish()));

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