feat(drag-and-drop): expose subject for drag event to customize drag event data

Author: radben13

lib/directives/tree-drag.directive.ts

@@ -21,6 +21,7 @@ export class TreeDragDirective implements DoCheck {
     // setting the data is required by firefox
     ev.dataTransfer.setData('text', ev.target.id);
     this.treeDraggedElement.set(this.draggedElement);
+    this.treeDraggedElement.setDragEvent(ev);
     if (this.draggedElement.mouseAction) {
         this.draggedElement.mouseAction('dragStart', ev);
     }

lib/models/tree-dragged-element.model.ts

@@ -1,4 +1,6 @@
 import { Injectable } from '@angular/core';
+import { Subject } from 'rxjs/Subject';
+import { Observable } from 'rxjs/Observable';
 
 @Injectable()
 export class TreeDraggedElement {
@@ -8,6 +10,14 @@ export class TreeDraggedElement {
     this._draggedElement = draggedElement;
   }
 
+  _dragEventSubject: Subject<DragEvent> = new Subject<DragEvent>();
+  setDragEvent(e: DragEvent) {
+    this._dragEventSubject.next(e);
+  }
+  get dragEventObservable(): Observable<DragEvent> {
+    return this._dragEventSubject.asObservable();
+  }
+
   get(): any {
     return this._draggedElement;
   }