neon-animation-runner-behavior.js

import { NeonAnimatableBehavior } from './neon-animatable-behavior.js';
import './neon-animatable-behavior.js';

/**
 * `Polymer.NeonAnimationRunnerBehavior` adds a method to run animations.
 *
 * @polymerBehavior Polymer.NeonAnimationRunnerBehavior
 */
const NeonAnimationRunnerBehaviorImpl = {

  _configureAnimations: function(configs) {
    var results = [];
    if (configs.length > 0) {
      for (var config, index = 0; config = configs[index]; index++) {
        var neonAnimation = document.createElement(config.name);
        // is this element actually a neon animation?
        if (neonAnimation.isNeonAnimation) {
          var result = null;
          // configuration or play could fail if polyfills aren't loaded
          try {
            result = neonAnimation.configure(config);
            // Check if we have an Effect rather than an Animation
            if (typeof result.cancel != 'function') {
              result = document.timeline.play(result);
            }
          } catch (e) {
            result = null;
            console.warn('Couldnt play', '(', config.name, ').', e);
          }
          if (result) {
            results.push({
              neonAnimation: neonAnimation,
              config: config,
              animation: result,
            });
          }
        } else {
          console.warn(this.is + ':', config.name, 'not found!');
        }
      }
    }
    return results;
  },

  _shouldComplete: function(activeEntries) {
    var finished = true;
    for (var i = 0; i < activeEntries.length; i++) {
      if (activeEntries[i].animation.playState != 'finished') {
        finished = false;
        break;
      }
    }
    return finished;
  },

  _complete: function(activeEntries) {
    for (var i = 0; i < activeEntries.length; i++) {
      activeEntries[i].neonAnimation.complete(activeEntries[i].config);
    }
    for (var i = 0; i < activeEntries.length; i++) {
      activeEntries[i].animation.cancel();
    }
  },

  /**
   * Plays an animation with an optional `type`.
   * @param {string=} type
   * @param {!Object=} cookie
   */
  playAnimation: function(type, cookie) {
    var configs = this.getAnimationConfig(type);
    if (!configs) {
      return;
    }
    this._active = this._active || {};
    if (this._active[type]) {
      this._complete(this._active[type]);
      delete this._active[type];
    }

    var activeEntries = this._configureAnimations(configs);

    if (activeEntries.length == 0) {
      this.fire('neon-animation-finish', cookie, {bubbles: false});
      return;
    }

    this._active[type] = activeEntries;

    for (var i = 0; i < activeEntries.length; i++) {
      activeEntries[i].animation.onfinish = function() {
        if (this._shouldComplete(activeEntries)) {
          this._complete(activeEntries);
          delete this._active[type];
          this.fire('neon-animation-finish', cookie, {bubbles: false});
        }
      }.bind(this);
    }
  },

  /**
   * Cancels the currently running animations.
   */
  cancelAnimation: function() {
    for (var k in this._animations) {
      this._animations[k].cancel();
    }
    this._animations = {};
  }
};

/** @polymerBehavior Polymer.NeonAnimationRunnerBehavior */
export const NeonAnimationRunnerBehavior = [
  NeonAnimatableBehavior,
  NeonAnimationRunnerBehaviorImpl
];