Modal Dialog Test

app.transitions.js

// Problem happens regardless of duration, but unless using
// the `.velocity-animating` CSS hack it is easier to see with longer durations.
const options = {duration: 1000, easing: 'easeInOutQuad'};

export default function(){
  this.transition(
    // this works
    //this.use('fade')

    // this has a glitch; can see second copy/ghost of modal in top left when closing
    this.use('explode',  {
      pick: '.ember-modal-overlay',
      use: 'fade'
    }, {
      pick: '.ember-modal-dialog',
      use: 'toUp'
    })    
  );
};

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'ember-modal-dialog test',
  show: false,
  actions: {
  	toggle() {
    	this.toggleProperty('show');
    }
  }
});

styles.app.css

/* Avoid scrollbars */
body {
  margin: 0;
  padding: 0;
  border: 0;
}

/* Hack #1  -- almost does the trick but still flashes briefly */
.ember-modal-overlay.velocity-animating .ember-modal-dialog {
  display: none !important;
}

/* Hack #2 -- works but quite fragile (depends on liquid-fire explode ordering, etc.) */
/*.ember-modal-overlay ~ .ember-modal-dialog {
  display: none !important;
}*/

/* Taken from ember-modal-structure.scss, adapted for compatibility */
.ember-modal-dialog {
  z-index: 51;
  position: fixed;
}

.ember-modal-dialog.emd-in-place {
  position: static;
}

.ember-modal-wrapper.emd-static.emd-wrapper-target-attachment-center .ember-modal-dialog {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.ember-modal-wrapper.emd-animatable.emd-wrapper-target-attachment-center {
  width: 100%;
  width: 100vw;
  height: 100%;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ember-modal-wrapper.emd-animatable.emd-wrapper-target-attachment-center .ember-modal-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
}
.ember-modal-wrapper.emd-animatable .ember-modal-dialog {
  position: relative;
}

.ember-modal-overlay {
  width: 100%;
  width: 100vw;
  height: 100%;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
}


/* Taken from ember-modal-appearance.scss and adapted for compatibility */
.ember-modal-dialog {
  border-radius: 8px;
  background-color: #fff;
  box-shadow: 0 0 10px #222;
  padding: 10px;
}
.ember-modal-overlay.translucent {
  background-color: grey;
  background-color: rgba(127, 127, 127, 0.77);
  background-color: rgba(#808080, .77);
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
show: {{show}}<br>
<a href="#" {{action 'toggle'}}>Toggle</a>
{{#liquid-if show}}
  {{#modal-dialog
    onClose='toggle'
    translucentOverlay=true
    animatable=true
  }}<p>Oh hai there!</p>
  <a href="#" class="close-button" {{action 'toggle'}}>Close</a>
  {{/modal-dialog}}
{{/liquid-if}}
<br><br>
Working around problem using CSS to hide "ghost" modal:
<pre>
.ember-modal-overlay ~ .ember-modal-dialog {
  display: none !important;
}
</pre>

twiddle.json

{
  "version": "0.12.1",
  "ENV": {
  	"ember-modal-dialog": {
    	"hasLiquidWormhole": "2.0.5",
    	"hasLiquidTether": "2.0.4",
    	"hasEmberTether": "1.0.0-beta.0"
  	}
  },
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.js",
    "ember": "2.12.0",    
    "ember-modal-dialog": "2.2.0",
    "ember-tether": "1.0.0-beta.0",
    "liquid-fire": "0.27.3",
    "liquid-tether": "2.0.4",
    "liquid-wormhole": "2.0.5"
  },
  "addons": {
    "liquid-fire": "0.27.3",
    "liquid-tether": "2.0.4",
    "liquid-wormhole": "2.0.5",
    "ember-tether": "1.0.0-beta.0",
    "ember-modal-dialog": "2.2.0"
  }
}