Playback

Playing and pausing animations
Rive lets you specify what artboard to use, what animations and state machines to mix and play, and to control the play/pause state of each animation.
From here on we're going to use the term animations collectively to refer to both animations and state machines. Where there are differences between the two, we'll explicitly call this out.
Choosing an artboard
When a Rive object is instantiated, the artboard to use can be specified. If no artboard is given, the default artboard is used. Only one artboard can be used at a time.
web
Flutter
web
new rive.Rive({
    src: 'https://cdn.rive.app/animations/vehicles.riv',
    canvas: document.getElementById('canvas'),
    artboard: 'Truck',
    autoplay: true
});
Flutter
RiveAnimation.network(
    'https://cdn.rive.app/animations/vehicles.riv',
    artboard: 'Truck'
);
Choosing starting animations
Starting animations can also be chosen when Rive is instantiated. A list of animation names can be provided.
web
Flutter
web
// Play the idle animation
new rive.Rive({
    src: 'https://cdn.rive.app/animations/vehicles.riv',
    canvas: document.getElementById('canvas'),
    animations: ['idle', 'curves'],
    autoplay: true
});
​
// play and mix the idle and curves animations
new rive.Rive({
    src: 'https://cdn.rive.app/animations/vehicles.riv',
    canvas: document.getElementById('canvas'),
    animations: ['idle', 'curves'],
    autoplay: true
});
Flutter
// Play the curves animation
RiveAnimation.network(
    'https://cdn.rive.app/animations/vehicles.riv',
    animations: ['curves'],
);
​
// Play and mix both the idle and curves animations
RiveAnimation.network(
    'https://cdn.rive.app/animations/vehicles.riv',
    animations: ['idle', 'curves'],
),
Choosing starting state machines
A starting state machine can be specified when Rive is instantiated. A state machine name can be provided.
web
Flutter
web
new rive.Rive({
    src: 'https://cdn.rive.app/animations/vehicles.riv',
    canvas: document.getElementById('canvas'),
    stateMachines: 'weather',
    autoplay: true
});
Flutter
RiveAnimation.network(
    'https://cdn.rive.app/animations/vehicles.riv',
    stateMachines: ['weather'],
)
Controlling playback
Playback of each animation and state machine can be separately controlled. You can play and pause playback using the play , pause and stop methods, either passing in the names of the animations you want to effect, or passing in nothing which will effect all instanced animations.
You can also provide callback to receive notification when certain events have occurred:
onload when a rive file has been loaded and initialized; it's now ready for playback
onplay when one or more animations play; provides a list of animations
onpause when one or more animations pause; provides a list of animations
onloop when an animation loops; provides the animation name
web
Flutter
web
<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="user-scalable=no">
        <title>Manually Control Rive Animations</title>
        <link rel="stylesheet" href="styles.css">
    </head>
    <body class="parent">
        <div>
            <canvas id="canvas" width="500" height="500"></canvas>
        </div>
        <div>
            <button id="idle">Start Truck</button>
            <button id="wipers">Start Wipers</button>
        </div>
​
        <script src="/dist/rive.min.js"></script>
        <script>
            // animation will show the first frame but not start playing
            const truck = new rive.Rive({
                src: 'https://cdn.rive.app/animations/vehicles.riv',
                artboard: 'Jeep',
                canvas: document.getElementById('canvas'),
                layout: new rive.Layout({fit: 'fill'}),
            });
​
            const idleButton = document.getElementById('idle');
            const wipersButton = document.getElementById('wipers');
​
            idleButton.onclick = _ => 
            truck.playingAnimationNames.includes('idle') ?
                    truck.pause('idle') :
                    truck.play('idle');
​
            wipersButton.onclick = _ =>
                truck.playingAnimationNames.includes('windshield_wipers') ?
                    truck.pause('windshield_wipers') :
                    truck.play('windshield_wipers');
                          
            // Listen for play events to update button text
            truck.on(rive.EventType.Play, (event) => {
                const names = event.data;
                names.forEach((name) => {
                    if (name === 'idle') {
                        idleButton.innerHTML = 'Stop Truck';
                    } else if (name === 'windshield_wipers') {
                        wipersButton.innerHTML = 'Stop Wipers';
                    } 
                });
            });
​
            // Listen for pause events to update button text
            truck.on(rive.EventType.Pause, (event) => {
                const names = event.data;
                names.forEach((name) => {
                    if (name === 'idle') {
                        idleButton.innerHTML = 'Start Truck';
                    } else if (name === 'windshield_wipers') {
                        wipersButton.innerHTML = 'Start Wipers';
                    }
                });
            });
        </script>
    </body>
</html>
Flutter
Flutter handles things a little differently to the other runtimes due to its reactive nature.
Every animation and state machine in Flutter has an underlying controller that manages the state of each animation. When you pass a list of animation names to the RiveAnimation widget, it creates and manages controllers for each.
On order to access control to animations, you'll need to instantiate a RiveAnimationController for each animation, and pass the controller to the widget instead of its name. You can mix and match passing in controllers and names, but don't pass in both for the same animation.
There are a number of controllers provided in the runtime that perform certain tasks. We'll cover these as they become relevant.
Manually controlling a looping animation
SimpleAnimation is a basic controller that provides simple playback control of an animation. With this you can play, pause, and reset animations.
In the following example, the isActive property of SimpleAnimation is used to play and pause a single animation.
import 'package:flutter/material.dart';
import 'package:rive/rive.dart';
​
class PlayPauseAnimation extends StatefulWidget {
  const PlayPauseAnimation({Key? key}) : super(key: key);
​
  @override
  _PlayPauseAnimationState createState() => _PlayPauseAnimationState();
}
​
class _PlayPauseAnimationState extends State<PlayPauseAnimation> {
  /// Controller for playback
  late RiveAnimationController _controller;
​
  /// Toggles between play and pause animation states
  void _togglePlay() =>
      setState(() => _controller.isActive = !_controller.isActive);
​
  /// Tracks if the animation is playing by whether controller is running
  bool get isPlaying => _controller.isActive;
​
  @override
  void initState() {
    super.initState();
    _controller = SimpleAnimation('idle');
  }
​
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Animation Example'),
      ),
      body: Center(
        child: RiveAnimation.network(
          'https://cdn.rive.app/animations/vehicles.riv',
          controllers: [_controller],
          // Update the play state when the widget's initialized
          onInit: () => setState(() {}),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _togglePlay,
        tooltip: isPlaying ? 'Pause' : 'Play',
        child: Icon(
          isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }
}
Repeatedly playing a one-shot animation
One-shot animations do not loop. OneShotAnimation is a controller that will automatically stop and reset a one-shot animation when it has played through so it can be repeatedly played as required.
The controller also provides two callbacks: onStart and onStop that will fire when the animation starts and stops playing respectively.
The example below demonstrates mixing animation names with controllers. The idle and curves animations are managed by the runtime and as their looping animations will play continuously. bounce is a one-shot and is triggered when the button is tapped. The runtime will then play bounce, mixing it cleanly with the looping animations.
import 'package:flutter/material.dart';
import 'package:rive/rive.dart';
​
class PlayOneShotAnimation extends StatefulWidget {
  const PlayOneShotAnimation({Key? key}) : super(key: key);
​
  @override
  _PlayOneShotAnimationState createState() => _PlayOneShotAnimationState();
}
​
class _PlayOneShotAnimationState extends State<PlayOneShotAnimation> {
  /// Controller for playback
  late RiveAnimationController _controller;
​
  /// Is the animation currently playing?
  bool _isPlaying = false;
​
  @override
  void initState() {
    super.initState();
    _controller = OneShotAnimation(
      'bounce',
      autoplay: false,
      onStop: () => setState(() => _isPlaying = false),
      onStart: () => setState(() => _isPlaying = true),
    );
  }
​
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('One-Shot Example'),
      ),
      body: Center(
        child: RiveAnimation.network(
          'https://cdn.rive.app/animations/vehicles.riv',
          animations: const ['idle', 'curves'],
          controllers: [_controller],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        // disable the button while playing the animation
        onPressed: () => _isPlaying ? null : _controller.isActive = true,
        tooltip: 'Play',
        child: const Icon(Icons.arrow_upward),
      ),
    );
  }
}
​
​
Runtimes - Previous
Layout
Next - Runtimes
State Machines
Last updated 6 days ago