@arjun98 Did you check https://doc.qt.io/qt-5/qmediaplayer.html ? It also has signals you can use for your purpose.

Hi
You can try
setWindowOpacity();
https://doc.qt.io/qt-5/qwidget.html#windowOpacity-prop
with a PropertyAnimation
https://doc.qt.io/qt-5/qpropertyanimation.html

@coutKateM And what is now your exact problem/question?

@ricardovaras_99 said in What library should I use for animation in Qt Widgets Application?:

And I want to simulate water level increasing on a tank.

Do you want to animate the water level (in other words, make the level rise or fall at a specific speed in real time)? Or do you just want to display the water level? (in other words, make the picture show the latest level)?

If you want the latter, have a look at the Qt Quick Coffee Machine demo:

Video: https://resources.qt.io/videos/built-with-qt-qt-quick-coffee-machine-demo-qtws17 Code: https://doc.qt.io/qt-5/qtdoc-demos-coffee-example.html

@incam https://doc.qt.io/qt-5/qpropertyanimation.html

Qt lottie might be an option. That's exactly its purpose

Hi and welcome to the forums
Why not export it directly to a video format ? Like mp4 etc ? ( from photoshop)
( and play that file in Qt)
Also how big is the frames ?
Would something like animated gif work ?

hi
@newbisoso said in scalling an object smoothly over time:

pulses ones every second

that is because you have an interval of 1000ms on the Timer, reducing the interval will make transition smoother
but what @J-Hill suggested is probably more suited.

@KillerSmath Time is not a problem, in my app I don't revert animation immediately but on user request and the problem still occurrs.
Actually I've found a solution : simply remove Transition and instead of this use Behavior on

Hi,

One alternative could be to use QRubberBand and draw it on top of the lines/cells you are interested in.

Then why not install the suggested module ?

@philm001
the stylesheet declaration should rather look like this i guess:

w->setStyleSheet(QString("QListView::item { background: rgba(255, 0, 0, %1)}").arg(value.toInt())