speed: Controls speed of the animation.friction: Controls "bounciness"/overshoot.The friction/tension or bounciness/speed options match the spring model in Facebook Pop, Rebound, and Origami. Note that you can only define one of bounciness/speed, tension/friction, or stiffness/damping/mass, but not more than one: Tracks velocity state to create fluid motions as the toValue updates, and can be chained together.Ĭonfig is an object that may have the following options. The first level is an array to allow mapping across multiple args, and that array contains nested objects.įor example, when working with horizontal scrolling gestures, you would do the following in order to map to scrollX (an Animated.Value):Īnimates a value according to an analytical spring model based on damped harmonic oscillation. This is done with a structured map syntax so that values can be extracted from complex event objects. Gestures, like panning or scrolling, and other events can map directly to animated values using Animated.event(). Read more about interpolation in the Animation guide. It uses linear interpolation by default but also supports easing functions. By default, it will extrapolate the curve beyond the ranges given, but you can also have it clamp the output value. The interpolate() function allows input ranges to map to different output ranges. You can combine two animated values via addition, subtraction, multiplication, division, or modulo to make a new animated value: See Tracking dynamic values in the Animations guide.īy default, if one animation is stopped or interrupted, then all other animations in the group are also stopped. Animated.stagger() starts animations in order and in parallel, but with successive delays.Īnimations can also be chained together by setting the toValue of one animation to be another Animated.Value.quence() starts the animations in order, waiting for each to complete before starting the next.Animated.parallel() starts a number of animations at the same time. lay() starts an animation after a given delay.createAnimatedComponent() can be used to make a component animatable.Īnimated exports the following animatable components using the above wrapper:Īnimations can also be combined in complex ways using composition functions:.They also handle cleanup on unmount so they are safe by default. These unique components do the magic of binding the animated values to the properties, and do targeted native updates to avoid the cost of the React render and reconciliation process on every frame. Only animatable components can be animated. You can use the native driver by specifying useNativeDriver: true in your animation configuration. Once the animation has started, the JS thread can be blocked without affecting the animation. īy using the native driver, we send everything about the animation to native before starting the animation, allowing native code to perform the animation on the UI thread without having to go through the bridge on every frame. If the animation finished running normally, the completion callback will be invoked with. start() takes a completion callback that will be called when the animation is done. Working with animations Īnimations are started by calling start() on your animation. By default, it uses a symmetric easeInOut curve that conveys the gradual acceleration of an object to full speed and concludes by gradually decelerating to a stop. In most cases, you will be using timing(). Animated.timing() animates a value over time using easing functions.Animated.spring() provides a basic spring physics model.cay() starts with an initial velocity and gradually slows to a stop.Each animation type provides a particular animation curve that controls how your values animate from their initial value to the final value: Configuring animations Īnimated provides three types of animation types. A single Animated.Value can drive any number of properties. There are two value types you can use with Animated:Īnimated.Value can bind to style properties or other props, and can be interpolated as well. Refer to the Animations guide to see additional examples of Animated in action.
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