com.google.gwt.touch.client

Class DefaultMomentum

java.lang.Object

com.google.gwt.touch.client.DefaultMomentum

All Implemented Interfaces:

Momentum

public class DefaultMomentum
extends Object
implements Momentum

Default implementation of momentum.

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.gwt.touch.client.Momentum

Momentum.State

Constructor Summary

Constructors

Constructor and Description
DefaultMomentum()

Method Summary

Methods

Modifier and Type	Method and Description
Momentum.State	createState(Point initialPosition, Point initialVelocity) Create a Momentum.State instance.
boolean	updateState(Momentum.State state) Update the state based on the specified Momentum.State.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Constructor Detail

DefaultMomentum

public DefaultMomentum()

Method Detail

createState

public Momentum.State createState(Point initialPosition,
                         Point initialVelocity)

Description copied from interface: Momentum

Create a Momentum.State instance. The Momentum.State instance will be passed to Momentum.updateState(State) until the momentum is depleted.

Specified by:

createState in interface Momentum

Parameters:

initialPosition - the initial position

initialVelocity - the initial velocity in pixels per millisecond

updateState

public boolean updateState(Momentum.State state)

Description copied from interface: Momentum

Update the state based on the specified Momentum.State. When no more momentum remains, this method should return false to stop future calls.

The Momentum.State instance is created by a call to Momentum.createState(Point, Point), and the same instance if used for the duration of the momentum. This method should modify the existing state by calling Momentum.State.setPosition(Point) and/or Momentum.State.setVelocity(Point).

Specified by:

updateState in interface Momentum

Parameters:

state - the current state

Returns:

true to continue momentum, false if no momentum remains