react-native/Libraries/Animation/AnimationExperimental.js

/**
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule AnimationExperimental
 * @flow
 */
'use strict';

var RCTAnimationManager = require('NativeModules').AnimationExperimentalManager;
var AnimationUtils = require('AnimationUtils');

type EasingFunction = (t: number) => number;

/**
 * This is an experimental module that is under development, incomplete,
 * potentially buggy, not used in any production apps, and will probably change
 * in non-backward compatible ways.
 *
 * Use at your own risk.
 */
var AnimationExperimental = {
  Mixin: require('AnimationExperimentalMixin'),

  startAnimation: function(
    node: any,
    duration: number,
    delay: number,
    easing: (string | EasingFunction),
    properties: {[key: string]: any}
  ): number {
    var nodeHandle = +node.getNodeHandle();
    var easingSample = AnimationUtils.evaluateEasingFunction(duration, easing);
    var tag: number = RCTAnimationManager.startAnimation(
      nodeHandle,
      AnimationUtils.allocateTag(),
      duration,
      delay,
      easingSample,
      properties
    );
    return tag;
  },

  stopAnimation: function(tag: number) {
    RCTAnimationManager.stopAnimation(tag);
  },
};

module.exports = AnimationExperimental;