com.facebook.litho.animation

Class BezierTransition

java.lang.Object

com.facebook.litho.animation.TransitionAnimationBinding

com.facebook.litho.animation.BezierTransition

All Implemented Interfaces:

AnimationBinding

public class BezierTransition
extends TransitionAnimationBinding

Animation for the transition of the position of a mount content on a quadratic Bezier curve.

Constructor Summary

Constructors

Constructor and Description
BezierTransition(PropertyAnimation xProperty, PropertyAnimation yProperty, float controlX, float controlY) Creates a quadratic Bezier transition.

Method Summary

Modifier and Type	Method and Description
void	addListener(AnimationBindingListener animationBindingListener) Adds a AnimationBindingListener.
void	collectTransitioningProperties(ArrayList<PropertyAnimation> outList) Collects the set of PropertyAnimations that this animation will animate.
Object	getTag() Allows adding a tags that can also be used to store data without resorting to another data structure.
void	removeListener(AnimationBindingListener animationBindingListener) Removes a previously added AnimationBindingListener.
void	setTag(Object tag)
protected void	setupBinding(Resolver resolver) Subclasses should set up their animation by creating a graph that defines how data will flow to relevant AnimatedPropertyNodes.

Methods inherited from class com.facebook.litho.animation.TransitionAnimationBinding

addBinding, addBinding, isActive, prepareToStartLater, start, stop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BezierTransition

public BezierTransition(PropertyAnimation xProperty,
                        PropertyAnimation yProperty,
                        float controlX,
                        float controlY)

Creates a quadratic Bezier transition. The control x/y are used to configure the shape of the curve. Because we don't know the start/end positions beforehand, the control point is defined in terms of the distance between the start and end points of this animation. It is NOT in terms of pixels or dp.

Specifically, controlPointX=0 will give the control point the x position of initial position of the curve. controlPointX=1 will give the control point the x position of the end of the curve. controlPointX=.5 will give it the x position midway between the start and end x positions. Increasing the value beyond 1 or below 0 will move the control point beyond the end x position or before the start x position, respectively, while values between 0 and 1 will place the point in between the start and end x positions.

All of the above also applies to the controlPointY value as well.

For good looking curves, you want to make sure controlPointX != controlPointY (or else the curve won't curve since it lies on the straight line between the start and end points).

Method Detail

collectTransitioningProperties

public void collectTransitioningProperties(ArrayList<PropertyAnimation> outList)

Description copied from interface: AnimationBinding

Collects the set of PropertyAnimations that this animation will animate. This is used to make sure before/after values are recorded and accessible for the animation. Implementations should add their animating properties to this set.

Note: This is a 'collect' call instead of a getter to allocating more sets then necessary for animations with nested animation (e.g. a sequence of animations). Yay Java.

setupBinding

protected void setupBinding(Resolver resolver)

Description copied from class: TransitionAnimationBinding

Subclasses should set up their animation by creating a graph that defines how data will flow to relevant AnimatedPropertyNodes.

Specified by:

setupBinding in class TransitionAnimationBinding

addListener

public final void addListener(AnimationBindingListener animationBindingListener)

Description copied from interface: AnimationBinding

Adds a AnimationBindingListener.

Specified by:

addListener in interface AnimationBinding

removeListener

public final void removeListener(AnimationBindingListener animationBindingListener)

Description copied from interface: AnimationBinding

Removes a previously added AnimationBindingListener.

Specified by:

removeListener in interface AnimationBinding

getTag

public Object getTag()

Description copied from interface: AnimationBinding

Allows adding a tags that can also be used to store data without resorting to another data structure. *

Specified by:

getTag in interface AnimationBinding

setTag

public void setTag(Object tag)

Specified by:

setTag in interface AnimationBinding