Feature: implement drag start action

addon/components/drag-sort-item.js

@@ -35,6 +35,7 @@ export default Component.extend({
   sourceOnly      : false,
 
   dragEndAction                  : undefined,
+  dragStartAction                : undefined,
   determineForeignPositionAction : undefined,
 
 
@@ -162,6 +163,19 @@ export default Component.extend({
       if (event.dataTransfer.setDragImage) event.dataTransfer.setDragImage(this.element, 0, 0)
     }
 
+    const dragStartAction = this.get('dragStartAction')
+
+    if (dragStartAction) {
+      const element = this.get('element')
+      const item    = this.get('item')
+
+      dragStartAction({
+        event,
+        element,
+        draggedItem : item,
+      })
+    }
+
     this.startDragging(event)
   },
 

addon/components/drag-sort-list.js

@@ -28,6 +28,7 @@ export default Component.extend({
   isRtl        : false,
 
   dragEndAction                  : undefined,
+  dragStartAction                : undefined,
   determineForeignPositionAction : undefined,
 
 

addon/templates/components/drag-sort-list.hbs

@@ -12,6 +12,7 @@
     isRtl                          = isRtl
     draggingEnabled                = draggingEnabled
     dragEndAction                  = dragEndAction
+    dragStartAction                = dragStartAction
     determineForeignPositionAction = determineForeignPositionAction
     sourceOnly                     = sourceOnly
   }}