QPropertyAnimation不工作

Question

我正在尝试使用Qt的动画框架。我正在使用Qt网站上的一些示例代码，但它不起作用，错误：setGeometryDp: Unable to set geometry 100x30+0+0 on QWidgetWindow/'QPushButtonClassWindow'. Resulting geometry: 120x30+0+0 (frame: 8, 31, 8, 8, custom margin: 0, 0, 0, 0, minimum size: 0x0, maximum size: 16777215x16777215).

QPushButton button("Animated Button");
button.setGeometry(0, 0, 100, 30);
button.show();

QPropertyAnimation animation(&button, "geometry");
animation.setDuration(10000);
animation.setStartValue(QRect(0, 0, 100, 30));
animation.setEndValue(QRect(250, 250, 100, 30));

animation.start(); 

我不知道我做错了什么。

Answer 1

对象超出作用域

这是可行的：

QPushButton *button = new QPushButton();
button->setGeometry(0, 0, 100, 30);
button->show();

QPropertyAnimation *animation = new QPropertyAnimation(button, "geometry");
animation->setDuration(10000);
animation->setStartValue(QRect(0, 0, 100, 30));
animation->setEndValue(QRect(250, 250, 100, 30));

animation->start();

编辑:我的最终解决方案

QPushButton *button = new QPushButton(this);
button->setGeometry(0, 0, 100, 30);
button->show();

QPropertyAnimation *animation = new QPropertyAnimation(button, "geometry");
animation->setDuration(10000);
animation->setStartValue(QRect(0, 0, 100, 30));
animation->setEndValue(QRect(250, 250, 100, 30));

connect(animation, SIGNAL(finished()), animation, SLOT(deleteLater()));

animation->start();