animated/src/AnimatedTransform.js

Declarative Animations Library for React and React Native

/**
 * 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.
 *
 * @flow
 */
'use strict';

var Animated = require('./Animated');
var AnimatedWithChildren = require('./AnimatedWithChildren');

class AnimatedTransform extends AnimatedWithChildren {
  _transforms: Array<Object>;

  constructor(transforms: Array<Object>) {
    super();
    this._transforms = transforms;
  }

  __getValue(): Array<Object> {
    return this._transforms.map(transform => {
      var result = {};
      for (var key in transform) {
        var value = transform[key];
        if (value instanceof Animated) {
          result[key] = value.__getValue();
        } else {
          result[key] = value;
        }
      }
      return result;
    });
  }

  __getAnimatedValue(): Array<Object> {
    return this._transforms.map(transform => {
      var result = {};
      for (var key in transform) {
        var value = transform[key];
        if (value instanceof Animated) {
          result[key] = value.__getAnimatedValue();
        } else {
          // All transform components needed to recompose matrix
          result[key] = value;
        }
      }
      return result;
    });
  }

  __attach(): void {
    this._transforms.forEach(transform => {
      for (var key in transform) {
        var value = transform[key];
        if (value instanceof Animated) {
          value.__addChild(this);
        }
      }
    });
  }

  __detach(): void {
    this._transforms.forEach(transform => {
      for (var key in transform) {
        var value = transform[key];
        if (value instanceof Animated) {
          value.__removeChild(this);
        }
      }
    });
  }
}

module.exports = AnimatedTransform;