ember-mobile-menu/dist/spring.js

A draggable sidebar menu for Ember.

import { Spring as Spring$1 } from 'wobble';

/**
 * A thin wrapper around the `wobble` package which provides spring physics (damped harmonic oscillator).
 *
 * @class Spring
 * @private
 */
class Spring {
  spring;

  /**
   * @method constructor
   * @param {function} callback Called whenever the spring updates
   * @param {object} options See: https://github.com/skevy/wobble#api
   */
  constructor(callback = () => {}, options = {}) {
    const {
      onStop = () => {},
      ..._options
    } = options;
    const config = {
      stiffness: 100,
      damping: 10,
      mass: 1,
      restVelocityThreshold: 0.01,
      restDisplacementThreshold: 0.01,
      ..._options
    };
    this.spring = new Spring$1(config);
    this.spring.onUpdate(callback);
    this.spring.onStop(() => {
      this.promise.resolve();
      onStop();
    });
  }
  start() {
    this.promise = null;
    return new Promise(resolve => {
      this.promise = {
        resolve
      };
      const {
        fromValue,
        toValue,
        initialVelocity
      } = this.spring._config;

      // This is the same check as is done in wobble itself. It's needed to ensure our promise always resolves.
      if (fromValue !== toValue || initialVelocity !== 0) {
        this.spring.start();
      } else {
        this.promise.resolve();
      }
    });
  }
  stop() {
    this.spring.stop();
  }
  get currentVelocity() {
    return this.spring.currentVelocity;
  }
}

export { Spring as default };
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