ember-gen-helpers

Ember template helpers for manipulating generators in particular for handling css-based transitions

Philosophy

As an front-end developer, you should strive to do as much as you can with as low-powered tools as possible.

Nowhere is this maxim more true than in the construction of spiffy looking animations and transitions; as much as possible, we should use css instead of javascript to construct beautiful UI

Usage

This library exposes two helpers:

gen-anime

Suppose you want to move some stars around when a user clicks a button on your index page:

Your index.hbs might look like this:

<div class='index-page'>
  <div class='index-page__anime-square'>
    <img src='/assets/images/star.png' class='index-page__anime-image'>
  </div>
  <button>animate!</button>
</div>

We'd like to fly and rotate the stars from &--x1-y0 to &--x1-y1 to &--x0-y1 and none of the anime classes when the user clicks the animate button as according to the below scss file:

.index-page {
  &__anime-square {
    width: 50px;
    height: 50px;
    transition-property: transform;
    transition-duration: 500ms;
    transition-timing-function: ease-in-out;

    &--x1-y0 {
      transform: translateX(100px) rotate(15deg) translateY(0);
    }
    &--x1-y1 {
      transform: translateX(100px) rotate(30deg) translateY(100px);
    }
    &--x0-y1 {
      transform: translateX(0) rotate(45deg) translateY(100px);
    }

  }
  &__anime-image {
    width: 100%;
    height: auto;
  }
}

In traditional ember, you might use an observer, wrap in a component, or some other rather obtrusive strategy:

<div class='index-page'>
  {{#animate-stars isAnimating=isAnimating onDone=(action 'doSomething') as |animatingClass|}}
    <div class='index-page__anime-square {{animatingClass}}'>
      <img src='/assets/images/star.png' class='index-page__anime-image'>
    </div>
  {{/animate-stars}}
  <button {{action (mut isAnimating) true}}>animate!</button>
</div>

Ember.Component.extend({
  didInsertElement() {
    this.$('index-page__anime-square').one('transitionend', () => this.goToNextTransitionClass())
  }
});

With the {{gen-anime}} helper, we can skip the ember component creation step:

<div class='index-page'>
  <div class='index-page__anime-square 
    {{gen-anime 
      isAnimating
      'anime-square--x1-y0'
      'anime-square--x1-y1'
      'anime-square--x0-y1'
      'anime-square--x0-y0' 
      onDone=(action (mut isAnimating) false)}}'>
    <img src='/assets/images/star.png' class='index-page__anime-image'>
  </div>
  <button {{action (mut isAnimating) true}}>animate!</button>
</div>

This has the benefit of making the animation process entirely css and hbs (no javascript) and has the additional benefit of being more declarative

See it working here: https://foxnewsnetwork.github.io/ember-gen-helpers

gen-wrap

TODO

Installation

• git clone <repository-url> this repository
• cd ember-anime-helper
• npm install
• bower install

Running

• ember serve
• Visit your app at http://localhost:4200.

Running Tests

• npm test (Runs ember try:each to test your addon against multiple Ember versions)
• ember test
• ember test --server

Building

• ember build

For more information on using ember-cli, visit https://ember-cli.com/.