Simple Drag Example

components.simple-drag\.js

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

export default class SimpleDrag extends Component {

    @tracked statusText = "";
    @tracked overDropZone = false;

    @action dragHasStarted() {
        this.statusText = "Drag has started";
    }

    @action dropItem(dragEvent) {
        dragEvent.preventDefault();
        this.statusText = "Drop Has Completed";
        this.overDropZone = false;
    }
    @action dragOver(dragEvent) {
        dragEvent.preventDefault();
        dragEvent.dataTransfer.dropEffect = "move";
    }
    @action dropLeave() {
        this.statusText = "Drag has left drop zone";
        this.overDropZone = false;
    }
    @action dropEnter() {
        this.statusText = "Drag is entered Drop Zone";
        this.overDropZone = true;
    }
		@action dragEnd() {
      	this.statusText += "; Drag end";
    }
 }

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

styles.app\.css

.dropZone {
    padding: 10px;
    background-color: #CCC;
    width: 200px;
    text-align: center;
    border: 1px solid #fff;
  	margin-bottom: 24px;
}
.dropZone-over {
    border: 1px dashed #333;
    background-color: rgb(193, 211, 159);
}

.dragMe {
    width: 200px;
    padding: 10px;
    background-color: #333;
    color: white;
    text-align: center;
    cursor:move;
}

templates.application\.hbs

<h2>Simple Drag Example</h2>
<p>This is just a simple one element to drag on top of another</p>

<SimpleDrag />

templates.components.simple-drag\.hbs

<div 
    {{on "drop" this.dropItem}} 
    {{on "dragover" this.dragOver}}
    {{on "dragleave" this.dropLeave}}
    {{on "dragenter" this.dropEnter}}
    class="dropZone {{if this.overDropZone "dropZone-over"}}"
    role="button"
>
    Drop Zone 1
</div>

<div 
    {{on "dragstart" this.dragHasStarted}}
    {{on "dragend" this.dragEnd}}
    class="dragMe" 
    draggable="true"
    role="button"
>   
    Drag Me
</div>

<p>Drag Status: "{{this.statusText}}"</p>

twiddle\.json

{
  "version": "0.17.0",
  "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/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}