dragOverEvent constant

EventStreamProvider<MouseEvent> const dragOverEvent = const EventStreamProvider<MouseEvent>('dragover')

A stream of dragover events fired when a dragged object is currently being dragged over an element.

Other resources

Drag and drop sample based on the tutorial from HTML5Rocks. Drag and drop specification from WHATWG.

Implementation 

static const EventStreamProvider<MouseEvent> dragOverEvent =
    const EventStreamProvider<MouseEvent>('dragover')