Stop using `dragContent`

src/block_manager/view/BlockView.js

@@ -1,3 +1,4 @@
+import { isObject } from 'underscore';
 import { on, off, hasDnd } from 'utils/mixins';
 
 module.exports = Backbone.View.extend({
@@ -32,11 +33,12 @@ module.exports = Backbone.View.extend({
 
   handleDragStart(ev) {
     const content = this.model.get('content');
-    // Firefox requires setData
-    ev.dataTransfer.setData('text', null);
-    // Can't put the content in dataTransfer as it will not be available
-    // on `dragenter` event for security reason
-    this.config.em.set('dragContent', content);
+    const isObj = isObject(content);
+    const type = isObj ? 'text/json' : 'text';
+    const data = isObj ? JSON.stringify(content) : content;
+    console.log('handleDragStart', data);
+    // Note: data are not available on dragenter for security reason
+    ev.dataTransfer.setData(type, data);
   },
 
   /**

src/utils/Droppable.js

@@ -36,7 +36,7 @@ export default class Droppable {
     // force out like in BlockView
     const sorter = this.sorter;
     cancel && (sorter.moved = 0);
-    em.set('dragContent', '');
+    //em.set('dragContent', '');
     sorter.endMove();
     em.trigger('canvas:dragend', ev);
   }
@@ -109,7 +109,6 @@ export default class Droppable {
     const em = this.em;
     const types = dataTransfer.types;
     const files = dataTransfer.files;
-    const dragContent = em.get('dragContent'); // Used by blocks
     let content = dataTransfer.getData('text');
 
     if (files.length) {
@@ -136,13 +135,14 @@ export default class Droppable {
         attributes: { href: content },
         content: content
       };
-    } else if (dragContent) {
-      content = dragContent;
+    } else if (types.indexOf('text/json') >= 0) {
+      const json = dataTransfer.getData('text/json');
+      json && (content = JSON.parse(json));
     } else {
       content = content && `<div>${content}</div>`;
     }
 
-    const result = { content, dragContent };
+    const result = { content };
     em.trigger('canvas:dragdata', dataTransfer, result);
 
     return result;