description

# dragEvent constant Null safety

EventStreamProvider<MouseEvent> const dragEvent

A stream of `drag` events fired when an element is currently being dragged.

A `drag` event is added to this stream as soon as the drag begins. A `drag` event is also added to this stream at intervals while the drag operation is still ongoing.

## Other resources

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

## Implementation

    static const EventStreamProvider dragEvent =
        const EventStreamProvider('drag')