How to animate hiding/showing of a QVBoxLayout wid

问题:

I have this horizontal layout of a QWidget subclass using QHBoxLayout:

I would like the top widget to hide/show in sliding animation. I have read this article, and I know that I have to use QPropertyAnimation. Frankly, not a good Google result come up.

Any suggestion for code example or maybe link to an article?

回答1:

You can change the maximumHeight property of the top widget in an animation.

For hiding the top widget :

QPropertyAnimation *animation = new QPropertyAnimation(ui->topWidget, "maximumHeight");
animation->setDuration(1000);
animation->setStartValue(500);
animation->setEndValue(0);

animation->start();

for showing the top widget :

QPropertyAnimation *animation = new QPropertyAnimation(ui->topWidget, "maximumHeight");
animation->setDuration(1000);
animation->setStartValue(0);
animation->setEndValue(500);

animation->start();