com.google.gwt.touch.client
Class DefaultMomentum

java.lang.Object
  com.google.gwt.touch.client.DefaultMomentum

All Implemented Interfaces:

Momentum

public class DefaultMomentum
extends java.lang.Object
implements Momentum

Default implementation of momentum.

DefaultMomentum

public DefaultMomentum()

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