com.facebook.litho.dataflow

Class SpringNode

java.lang.Object

com.facebook.litho.dataflow.ValueNode

com.facebook.litho.dataflow.SpringNode

All Implemented Interfaces:

NodeCanFinish

public class SpringNode
extends ValueNode
implements NodeCanFinish

A node that implements spring physics: it takes an initial value ("initial" input) and end value ("end" input) and animates that value on each frame, outputting the progress over time.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	END_INPUT
static java.lang.String	INITIAL_INPUT
static double	NS_PER_SECOND

Fields inherited from class com.facebook.litho.dataflow.ValueNode

DEFAULT_INPUT

Constructor Summary

Constructors

Constructor and Description
SpringNode()
SpringNode(SpringConfig springConfig)

Method Summary

Modifier and Type	Method and Description
float	calculateValue(long frameTimeNanos) This node should calculate and set a new value based on frame time and its parents (the nodes it depends on).
boolean	isFinished() Called by framework code to determine whether a node is finished.

Methods inherited from class com.facebook.litho.dataflow.ValueNode

getInput, getInput, getValue, hasInput, hasInput, setValue

Methods inherited from class java.lang.Object

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

Field Detail

NS_PER_SECOND

public static final double NS_PER_SECOND

See Also:

Constant Field Values

INITIAL_INPUT

public static final java.lang.String INITIAL_INPUT

See Also:

Constant Field Values

END_INPUT

public static final java.lang.String END_INPUT

See Also:

Constant Field Values

Constructor Detail

SpringNode

public SpringNode()

SpringNode

public SpringNode(SpringConfig springConfig)

Method Detail

calculateValue

public float calculateValue(long frameTimeNanos)

Description copied from class: ValueNode

This node should calculate and set a new value based on frame time and its parents (the nodes it depends on). When this is called, it's guaranteed that the parent nodes have already been updated for this frame.

Specified by:

calculateValue in class ValueNode

isFinished

public boolean isFinished()

Description copied from interface: NodeCanFinish

Called by framework code to determine whether a node is finished. This will only be called on this node when all of its inputs are finished.

Specified by:

isFinished in interface NodeCanFinish

Returns:

whether this node is finished given that its inputs are finished.