toggle-buttons

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
	currentTab = "second";
	@action
	finalChoice(choiceText, choiceButton) {
   console.log('final choice', choiceText); 
  }
}

helpers.eq\.js

import { helper } from '@ember/component/helper';

export default helper(function eq(params/*, hash*/) {
  return params[0] === params[1];
});

styles.app\.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}
.toggle-buttons {
  display: flex;
}
.toggle-buttons button.selected {
 color: green; 
}

templates.application\.hbs

<ToggleButtons @onChoose={{this.finalChoice}} as |Tbutton|>
	<Tbutton @text="First Option" @selected={{eq this.currentTab "first"}}/>
  <Tbutton @text="Second button" @selected={{eq this.currentTab "second"}}/>
</ToggleButtons>

toggle-button-button.component\.js

import Component from '@ember/component';
import { action } from '@ember/object';

export default Component.extend({
  selected: false,
  text: '',
  
  // register the children with the parent
  didInsertElement() {
  	if (this.onInsert) this.onInsert(this);
  },
  
  // when we click, set selected and fire a selection
  btnClick: action(function() {
    this.set('selected', true);
    if (this.onSelect) this.onSelect(this.text, this);
  })
  
});

toggle-button-button.template\.hbs

<button {{on "click" this.btnClick}} class={{if this.selected "selected"}}>
	{{this.text}}
</button>

toggle-buttons.component\.js

import Component from '@ember/component';
import { action } from '@ember/object';

export default Component.extend({
  
  // holds all the child buttons
  buttons: [],
  
  // register the child with the parent
  // we need this so we can reset the other children
  childAdded: action(function(child) {
    this.buttons.pushObject(child);
  }),
  
  // when the parent has a selection
  onSelect: action(function(text, selectedButton) {
    const otherButtons = this.buttons.filter(b => b !== selectedButton);
    otherButtons.setEach('selected', false);
    if (this.onChoose) this.onChoose(text, selectedButton);
  })
 
});

toggle-buttons.template\.hbs

<div class="toggle-buttons">
	{{yield (component 'toggle-button-button' onSelect=this.onSelect onInsert=this.childAdded)}}
</div>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}