QAbstractAnimation

The QAbstractAnimation class is the base of all animations. More…

Inherited by: QAnimationGroup, QParallelAnimationGroup, QPauseAnimation, QPropertyAnimation, QSequentialAnimationGroup, QVariantAnimation

New in version 4.6.

Synopsis

Functions

• def currentLoop ()

• def currentLoopTime ()

• def currentTime ()

• def direction ()

• def group ()

• def loopCount ()

• def setDirection (direction)

• def setLoopCount (loopCount)

• def state ()

• def totalDuration ()

Virtual functions

• def duration ()

• def updateCurrentTime (currentTime)

• def updateDirection (direction)

• def updateState (newState, oldState)

Slots

• def pause ()

• def resume ()

• def setCurrentTime (msecs)

• def setPaused (arg__1)

• def start ([policy=KeepWhenStopped])

• def stop ()

Signals

• def currentLoopChanged (currentLoop)

• def directionChanged (arg__1)

• def finished ()

• def stateChanged (newState, oldState)

Detailed Description

The class defines the functions for the functionality shared by all animations. By inheriting this class, you can create custom animations that plug into the rest of the animation framework.

The progress of an animation is given by its current time ( currentLoopTime() ), which is measured in milliseconds from the start of the animation (0) to its end ( duration() ). The value is updated automatically while the animation is running. It can also be set directly with setCurrentTime() .

At any point an animation is in one of three states: Running , Stopped , or Paused –as defined by the State enum. The current state can be changed by calling start() , stop() , pause() , or resume() . An animation will always reset its current time when it is started. If paused, it will continue with the same current time when resumed. When an animation is stopped, it cannot be resumed, but will keep its current time (until started again). QAbstractAnimation will emit stateChanged() whenever its state changes.

An animation can loop any number of times by setting the loopCount property. When an animation’s current time reaches its duration() , it will reset the current time and keep running. A loop count of 1 (the default value) means that the animation will run one time. Note that a duration of -1 means that the animation will run until stopped; the current time will increase indefinitely. When the current time equals duration() and the animation is in its final loop, the Stopped state is entered, and the finished() signal is emitted.

QAbstractAnimation provides pure virtual functions used by subclasses to track the progress of the animation: duration() and updateCurrentTime() . The duration() function lets you report a duration for the animation (as discussed above). The animation framework calls updateCurrentTime() when current time has changed. By reimplementing this function, you can track the animation progress. Note that neither the interval between calls nor the number of calls to this function are defined; though, it will normally be 60 updates per second.

By reimplementing updateState() , you can track the animation’s state changes, which is particularly useful for animations that are not driven by time.

See also

QVariantAnimation QPropertyAnimation QAnimationGroup The Animation Framework

class QAbstractAnimation([parent=None])

param parent

QObject

Constructs the QAbstractAnimation base class, and passes parent to QObject ‘s constructor.

See also

QVariantAnimation QAnimationGroup

PySide2.QtCore.QAbstractAnimation.Direction

This enum describes the direction of the animation when in Running state.

Constant	Description
QAbstractAnimation.Forward	The current time of the animation increases with time (i.e., moves from 0 and towards the end / duration).
QAbstractAnimation.Backward	The current time of the animation decreases with time (i.e., moves from the end / duration and towards 0).

See also

direction

PySide2.QtCore.QAbstractAnimation.State

This enum describes the state of the animation.

Constant	Description
QAbstractAnimation.Stopped	The animation is not running. This is the initial state of QAbstractAnimation , and the state QAbstractAnimation reenters when finished. The current time remain unchanged until either setCurrentTime() is called, or the animation is started by calling start() .
QAbstractAnimation.Paused	The animation is paused (i.e., temporarily suspended). Calling resume() will resume animation activity.
QAbstractAnimation.Running	The animation is running. While control is in the event loop, QAbstractAnimation will update its current time at regular intervals, calling updateCurrentTime() when appropriate.

See also

state() stateChanged()

PySide2.QtCore.QAbstractAnimation.DeletionPolicy

Constant	Description
QAbstractAnimation.KeepWhenStopped	The animation will not be deleted when stopped.
QAbstractAnimation.DeleteWhenStopped	The animation will be automatically deleted when stopped.

PySide2.QtCore.QAbstractAnimation.currentLoop()

Return type

int

PySide2.QtCore.QAbstractAnimation.currentLoopChanged(currentLoop)

Parameters

currentLoop – int

PySide2.QtCore.QAbstractAnimation.currentLoopTime()

Return type

int

Returns the current time inside the current loop. It can go from 0 to duration() .

See also

duration() currentTime

PySide2.QtCore.QAbstractAnimation.currentTime()

Return type

int

See also

setCurrentTime()

PySide2.QtCore.QAbstractAnimation.direction()

Return type

Direction

See also

setDirection()

PySide2.QtCore.QAbstractAnimation.directionChanged(arg__1)

Parameters

arg__1 – Direction

PySide2.QtCore.QAbstractAnimation.duration()

Return type

int

This pure virtual function returns the duration of the animation, and defines for how long QAbstractAnimation should update the current time. This duration is local, and does not include the loop count.

A return value of -1 indicates that the animation has no defined duration; the animation should run forever until stopped. This is useful for animations that are not time driven, or where you cannot easily predict its duration (e.g., event driven audio playback in a game).

If the animation is a parallel QAnimationGroup , the duration will be the longest duration of all its animations. If the animation is a sequential QAnimationGroup , the duration will be the sum of the duration of all its animations.

See also

loopCount

PySide2.QtCore.QAbstractAnimation.finished()

PySide2.QtCore.QAbstractAnimation.group()

Return type

QAnimationGroup

If this animation is part of a QAnimationGroup , this function returns a pointer to the group; otherwise, it returns None .

See also

addAnimation()

PySide2.QtCore.QAbstractAnimation.loopCount()

Return type

int

See also

setLoopCount()

PySide2.QtCore.QAbstractAnimation.pause()

Pauses the animation. When the animation is paused, state() returns Paused. The value of currentTime will remain unchanged until resume() or start() is called. If you want to continue from the current time, call resume() .

See also

start() state() resume()

PySide2.QtCore.QAbstractAnimation.resume()

Resumes the animation after it was paused. When the animation is resumed, it emits the resumed() and stateChanged() signals. The currenttime is not changed.

See also

start() pause() state()

PySide2.QtCore.QAbstractAnimation.setCurrentTime(msecs)

Parameters

msecs – int

See also

currentTime()

PySide2.QtCore.QAbstractAnimation.setDirection(direction)

Parameters

direction – Direction

See also

direction()

PySide2.QtCore.QAbstractAnimation.setLoopCount(loopCount)

Parameters

loopCount – int

See also

loopCount()

PySide2.QtCore.QAbstractAnimation.setPaused(arg__1)

Parameters

arg__1 – bool

If paused is true, the animation is paused. If paused is false, the animation is resumed.

See also

state() pause() resume()

PySide2.QtCore.QAbstractAnimation.start([policy=KeepWhenStopped])

Parameters

policy – DeletionPolicy

Starts the animation. The policy argument says whether or not the animation should be deleted when it’s done. When the animation starts, the stateChanged() signal is emitted, and state() returns Running. When control reaches the event loop, the animation will run by itself, periodically calling updateCurrentTime() as the animation progresses.

If the animation is currently stopped or has already reached the end, calling will rewind the animation and start again from the beginning. When the animation reaches the end, the animation will either stop, or if the loop level is more than 1, it will rewind and continue from the beginning.

If the animation is already running, this function does nothing.

See also

stop() state()

PySide2.QtCore.QAbstractAnimation.state()

Return type

State

PySide2.QtCore.QAbstractAnimation.stateChanged(newState, oldState)

Parameters

• newState – State

• oldState – State

PySide2.QtCore.QAbstractAnimation.stop()

Stops the animation. When the animation is stopped, it emits the stateChanged() signal, and state() returns Stopped. The current time is not changed.

If the animation stops by itself after reaching the end (i.e., currentLoopTime() == duration() and currentLoop() > loopCount() - 1), the finished() signal is emitted.

See also

start() state()

PySide2.QtCore.QAbstractAnimation.totalDuration()

Return type

int

Returns the total and effective duration of the animation, including the loop count.

See also

duration() currentTime

PySide2.QtCore.QAbstractAnimation.updateCurrentTime(currentTime)

Parameters

currentTime – int

This pure virtual function is called every time the animation’s currentTime changes.

See also

updateState()

PySide2.QtCore.QAbstractAnimation.updateDirection(direction)

Parameters

direction – Direction

This virtual function is called by QAbstractAnimation when the direction of the animation is changed. The direction argument is the new direction.

See also

setDirection() direction()

PySide2.QtCore.QAbstractAnimation.updateState(newState, oldState)

Parameters

• newState – State

• oldState – State

This virtual function is called by QAbstractAnimation when the state of the animation is changed from oldState to newState .

See also

start() stop() pause() resume()