PyQt is the best GUI library because it has many widgets and classes. The Qabstractanimation Class in PyQt is the base class for all animations in the Qt Animation framework. It provides an interface for starting and controlling animations, as well as for monitoring their progress.

Example of QAbstractAnimation class in PyQt:

Here is a basic example of how to use the QAbstractAnimation class in PyQt:

#import widgets
from PyQt5.QtCore import QAbstractAnimation, QPropertyAnimation, QEasingCurve,QPoint
from PyQt5.QtWidgets import QApplication, QLabel

app = QApplication([])
label = QLabel("Hello, World!")
label.show()

# Create a property animation
animation = QPropertyAnimation(label, b"pos")
animation.setDuration(1000)
animation.setStartValue(label.pos())
animation.setEndValue(label.pos() + QPoint(100, 100))
animation.setEasingCurve(QEasingCurve.OutBounce)

# Connect to the finished signal
animation.finished.connect(app.quit)

# Start the animation
animation.start()

app.exec_()

In this example, we create a property animation that animates the position of a QLabel. We set the duration of the animation to 1000 milliseconds, and we use the QEasingCurve.OutBounce easing curve to give the animation a bouncy effect. We also connect the finished signal of the animation to the quit() slot of the QApplication, so that the application will exit when the animation is finished.

Basics of QAbstractAnimation class in PyQt:

This class provide some methodes to be used :

• start(): starts the animation
• stop(): stops the animation
• setDuration(ms): set the duration of the animation in milliseconds
• setCurrentTime(ms): set the current time of the animation in milliseconds
• state(): returns the current state of the animation (QAbstractAnimation.Stopped, QAbstractAnimation.Paused, or QAbstractAnimation.Running)
• loopCount(): returns the number of times the animation will loop
• setLoopCount(count): set the number of times the animation will loop

The QAbstractAnimation class has several virtual functions that must be implemented by subclasses, including:

• updateCurrentTime(): This function is called by the animation framework whenever the current time of the animation changes. Subclasses should implement this function to update the animation’s state based on the current time.
• updateState(): This function is called by the animation framework whenever the state of the animation changes. Subclasses should implement this function to update the animation’s state based on the new state.
• duration(): This function should return the total duration of the animation in milliseconds.

The QAbstractAnimation class also provides several signals that can be used to monitor the progress of an animation:

• finished(): This signal is emitted when the animation has finished running.
• stateChanged(QAbstractAnimation.State, QAbstractAnimation.State): This signal is emitted when the state of the animation changes. The first argument is the new state and the second argument is the old state.
• currentLoopChanged(int): This signal is emitted when the current loop of the animation changes. The argument is the new current loop.

Example #2

use the QAbstractAnimation class to create a simple animation that fades a QLabel in and out:

from PyQt5.QtCore import QAbstractAnimation, QEasingCurve, QPropertyAnimation
from PyQt5.QtGui import QColor
from PyQt5.QtWidgets import QApplication, QLabel

app = QApplication([])
label = QLabel("Hello, World!")
label.show()

# Create a property animation to animate the label's opacity
animation = QPropertyAnimation(label, b"windowOpacity")
animation.setDuration(8000)
animation.setStartValue(0)
animation.setEndValue(1)
animation.setEasingCurve(QEasingCurve.InOutQuad)

# Connect to the finished signal
animation.finished.connect(animation.deleteLater)

# Start the animation
animation.start()

app.exec_()

In this example, we create a property animation using the QPropertyAnimation class. Set the duration of the animation to 8000 milliseconds, and we use the QEasingCurve.InOutQuad easing curve to give the animation a smooth transition. We also set the start value of the animation to 0, and the end value to 1, so that the label’s opacity will change from 0 to 1 over the course of the animation.

We also connect the animation’s finished signal to the deleteLater() slot, so that the animation will be deleted automatically when it’s finished.

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