Wizard!

components.some-wizard-slide.js

import Ember from 'ember';

export default Ember.Component.extend({
  isActive: false,
  
  init() {
    this._super(arguments);

    if (this.registerSlide) {
      this.registerSlide(this)
    }
  }
});

components.some-wizard.js

import Ember from 'ember';
import {computed} from '@ember/object';

export default Ember.Component.extend({
  slides: [],
  currentSlideIndex: 0,
  
  hasCurrentSlide: computed('slides.[]', function() {
    return this.slides.any(slide => slide.isActive);
  }),
  
  actions: {
    registerSlide(slide) {
      this.set('slides', [...this.slides, slide])
      
      if (!this.hasCurrentSlide) {
        slide.set('isActive', true);
      }
    },
    
    previousSlide() {
      const idx = this.slides.findIndex(slide => slide.isActive);
      this.slides.forEach(slide => slide.set('isActive', false));
			this.slides[idx - 1].set('isActive', true);            
    },
    
			nextSlide() {
			const idx = this.slides.findIndex(slide => slide.isActive);
			this.slides.forEach(slide => slide.set('isActive', false));
			this.slides[idx + 1].set('isActive', true);            
			}
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

{{#some-wizard as |wizard|}}
	{{wizard.slide name='first slide'}}
  {{wizard.slide name='second slide'}}
  {{wizard.slide name='third slide'}}
  
    {{#wizard.slide}}
    	<h1>Hello</h1>
    {{/wizard.slide}}
{{/some-wizard}}

templates.components.some-wizard-slide.hbs

{{#if isActive}}

	{{#if (has-block)}}
		{{yield}}
  {{else}}
	  <h1> I am a Slide: {{@name}}</h1>
  {{/if}}
  

	<button onclick={{@nextSlide}}>Slide Previous</button>
  <button onclick={{@nextSlide}}>Slide Next</button>
{{/if}}

templates.components.some-wizard.hbs

<h1>Wizard</h1>

{{yield (hash
	slide=(component 
  	"some-wizard-slide" 
    registerSlide=(action 'registerSlide')
	  nextSlide=(action 'nextSlide')
    previousSlide=(action 'previousSlide')
  )
)}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}