Momentum (GWT Javadoc)

All Known Implementing Classes:

DefaultMomentum
```
public interface Momentum
```
Describes the momentum of a gesture after the gesture has been completed. You can use it to control the speed of scrolling for scrollable widgets affected by TouchScroller.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class Momentum.State
A snapshot of the current state.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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`.

- Method Detail
  - createState
```
Momentum.State createState(Point initialPosition,
                           Point initialVelocity)
```
    Create a Momentum.State instance. The Momentum.State instance will be passed to updateState(State) until the momentum is depleted.
    
    Parameters:
    
    initialPosition - the initial position
    
    initialVelocity - the initial velocity in pixels per millisecond
  - updateState
```
boolean updateState(Momentum.State state)
```
    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 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).
    
    Parameters:
    
    state - the current state
    
    Returns:
    
    true to continue momentum, false if no momentum remains