Module javafx.graphics
Package javafx.animation

# Class AnimationTimer

java.lang.Object
javafx.animation.AnimationTimer

    public abstract class AnimationTimer
    extends Object

The class `AnimationTimer` allows to create a timer, that is called in each frame while it is active. An extending class has to override the method `handle(long)` which will be called in every frame. The methods `start()` and `stop()` allow to start and stop the timer.

Since:
  JavaFX 2.0

- ## Constructor Summary

  Constructors
  Constructor | Description
  --- | ---
  `AnimationTimer()` | Creates a new timer.

- ## Method Summary

  Modifier and Type | Method | Description
  --- | --- | ---
  `abstract void` | `handle​(long now)` | This method needs to be overridden by extending classes.
  `void` | `start()` | Starts the `AnimationTimer`.
  `void` | `stop()` | Stops the `AnimationTimer`.

  ### Methods inherited from class java.lang.Object

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

- ## Constructor Details

  - ### AnimationTimer

    public AnimationTimer()
    Creates a new timer.

- ## Method Details

  - ### handle

    public abstract void handle​(long now)
    This method needs to be overridden by extending classes. It is going to be called in every frame while the `AnimationTimer` is active.
    Parameters:
      `now` - The timestamp of the current frame given in nanoseconds. This value will be the same for all `AnimationTimers` called during one frame.

  - ### start

    public void start()
    Starts the `AnimationTimer`. Once it is started, the `handle(long)` method of this `AnimationTimer` will be called in every frame. The `AnimationTimer` can be stopped by calling `stop()`.

  - ### stop

    public void stop()
    Stops the `AnimationTimer`. It can be activated again by calling `start()`.