QAbstractTransition¶

The QAbstractTransition class is the base class of transitions between QAbstractState objects. More…

Inherited by: QEventTransition, QSignalTransition, QKeyEventTransition, QMouseEventTransition

New in version 4.6.

Synopsis¶

Functions¶

def addAnimation (animation)
def animations ()
def machine ()
def removeAnimation (animation)
def setTargetState (target)
def setTargetStates (targets)
def setTransitionType (type)
def sourceState ()
def targetState ()
def targetStates ()
def transitionType ()

Virtual functions¶

def eventTest (event)
def onTransition (event)

Detailed Description¶

The QAbstractTransition class is the abstract base class of transitions between states ( QAbstractState objects) of a QStateMachine . QAbstractTransition is part of The State Machine Framework .

The sourceState() function returns the source of the transition. The targetStates() function returns the targets of the transition. The machine() function returns the state machine that the transition is part of.

The triggered() signal is emitted when the transition has been triggered.

Transitions can cause animations to be played. Use the addAnimation() function to add an animation to the transition.

Subclassing¶

The eventTest() function is called by the state machine to determine whether an event should trigger the transition. In your reimplementation you typically check the event type and cast the event object to the proper type, and check that one or more properties of the event meet your criteria.

The onTransition() function is called when the transition is triggered; reimplement this function to perform custom processing for the transition.

class QAbstractTransition([sourceState=None])¶

param sourceState

QState

Constructs a new QAbstractTransition object with the given sourceState .

PySide2.QtCore.QAbstractTransition.TransitionType¶

This enum specifies the kind of transition. By default, the type is an external transition.

Constant	Description
QAbstractTransition.ExternalTransition	Any state that is the source state of a transition (which is not a target-less transition) is left, and re-entered when necessary.
QAbstractTransition.InternalTransition	If the target state of a transition is a sub-state of a compound state, and that compound state is the source state, an internal transition will not leave the source state.

See also

transitionType

New in version 5.5.

PySide2.QtCore.QAbstractTransition.addAnimation(animation)¶

Parameters: animation – QAbstractAnimation

Adds the given animation to this transition. The transition does not take ownership of the animation.

See also

removeAnimation() animations()

PySide2.QtCore.QAbstractTransition.animations()¶

Return type

Returns the list of animations associated with this transition, or an empty list if it has no animations.

See also

addAnimation()

PySide2.QtCore.QAbstractTransition.eventTest(event)¶

Parameters: event – QEvent
Return type: bool

This function is called to determine whether the given event should cause this transition to trigger. Reimplement this function and return true if the event should trigger the transition, otherwise return false.

PySide2.QtCore.QAbstractTransition.machine()¶

Return type: QStateMachine

Returns the state machine that this transition is part of, or 0 if the transition is not part of a state machine.

PySide2.QtCore.QAbstractTransition.onTransition(event)¶

Parameters: event – QEvent

This function is called when the transition is triggered. The given event is what caused the transition to trigger. Reimplement this function to perform custom processing when the transition is triggered.

PySide2.QtCore.QAbstractTransition.removeAnimation(animation)¶