Question

根据以下代码段，我怀疑与QPropertyAnimation和QParallelAnimationGroup有关：

// Create the opacity animation
QPropertyAnimation *animation1 = new QPropertyAnimation(notification, "windowOpacity");
animation1->setDuration(animationDuration);
animation1->setStartValue(startOpacity);
animation1->setEndValue(endOpacity);
animation1->setEasingCurve(QEasingCurve::InBack);

// Create the position animation
QPropertyAnimation *animation2 = new QPropertyAnimation(notification, "pos");
animation2->setDuration(animationDuration);
animation2->setStartValue(startPos);
animation2->setEndValue(endPos);

// Create the animation group
QParallelAnimationGroup *group = new QParallelAnimationGroup;
group->addAnimation(animation1);
group->addAnimation(animation2);
group->start(QAbstractAnimation::DeleteWhenStopped);

connect(group, SIGNAL(finished()), group, SLOT(deleteLater()), Qt::UniqueConnection);

关于QAbstractAnimation::DeleteWhenStopped常量，Qt documentation说：

停止后动画将自动删除。

这是否意味着指针（animation1和animation2）将被自动删除？或者我仍然需要手动＆＃39;删除它们（可能使用信号和插槽，如下所示）？

connect(animation1, SIGNAL(finished()), animation1, SLOT(deleteLater()), Qt::UniqueConnection);
connect(animation2, SIGNAL(finished()), animation2, SLOT(deleteLater()), Qt::UniqueConnection);

我使用的是Qt 5.3。

Answer 1

是的，两者都被销毁了。

animation1->setProperty("nameObj", "animation1");
animation2->setProperty("nameObj", "animation2");
group->setProperty("nameObj", "group");

connect(animation1, SIGNAL(destroyed(QObject*)), this, SLOT(OnAnimationDestroyed(QObject*)));
connect(animation2, SIGNAL(destroyed(QObject*)), this, SLOT(OnAnimationDestroyed(QObject*)));
connect(group, SIGNAL(destroyed(QObject*)), this, SLOT(OnAnimationDestroyed(QObject*)));

group->start(QAbstractAnimation::DeleteWhenStopped);

void MyObj::OnAnimationDestroyed(QObject* obj)
{
    qDebug() << "Destroyed: " << obj->property("nameObj").toString();
}

结果是：

Destroyed:  "group"

Destroyed:  "animation1"

Destroyed:  "animation2"

使用QParallelAnimationGroup时会自动删除QPropertyAnimation？

1 个答案: