com.google.gwt.touch.client

## Interface Momentum

- 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 and Description
    --- | ---
    `static class` | `Momentum.State` A snapshot of the current state.

  - ### Method Summary

    All Methods Instance Methods Abstract 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`.

- - ### 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