full-screen menu pop-over example

components.main-menu.js

import Ember from 'ember';
import { inject as service } from '@ember/service';

export default Ember.Component.extend({
  tagName: 'nav', 
  classNames: 'main-menu',

  uiState: service('ui-state'),
  
  classNameBindings: ['uiState.menuOpen:open'],
  
  actions: {
    toggleMenu() {
      this.set('uiState.menuOpen', false);
    },
  }
});

controllers.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';

export default Ember.Controller.extend({
  appName: 'full-screen menu example',
  
  uiState: service('ui-state'),
 
  actions: {
    openMenu() {
    	this.set('uiState.menuOpen', true);  
    },
  },
});

services.ui-state.js

import Ember from 'ember';

export default Ember.Service.extend({
  
  menuOpen: false,

});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.main-menu {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: gray;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  pointer-events: none;
  opacity: 0;
  transition: .5s;
}

.main-menu.open {
  opacity: 1;
  pointer-events: initial;
}

templates.application.hbs

<h1>{{appName}}</h1>

<p>{{uiState.menuOpen}}</p>

<button {{action 'openMenu'}}>OPEN MENU</button>

<ul>
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</ul>

<MainMenu class={{if uiState.menuOpen "open"}} />

templates.components.main-menu.hbs

<div class='centered-content'>
  Menu items here...
</div>

<button {{action 'toggleMenu'}}>
  CLOSE
</button>

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"
  }
}