ClosestDragForwardingListener¶

Overview¶

A Scenery input listener that is able to find the closest in a list of items to a "down" event and trigger an action (usually a drag) on that item. Usually this will be a drag listener start/press (e.g. SimpleDragHandler/DragListener), but could accommodate other uses. It's similar in use to DragListener.createForwardingListener.

Handles items of the form: { startDrag: function( event ), computeDistance: function( globalPoint ) : number }

@author Jonathan Olson (PhET Interactive Simulations)

Class ClosestDragForwardingListener¶

import { ClosestDragForwardingListener } from 'scenerystack/sun';

Constructor¶

new ClosestDragForwardingListener( touchThreshold : number, mouseThreshold : number )¶

Instance Methods¶

addDraggableItem( item : DraggableItem )¶

Adds an item that can be dragged.

removeDraggableItem( item : DraggableItem )¶

Removes a previously-added item.

down( event : PressListenerEvent )¶

Called on pointer down.

Source Code¶

See the source for ClosestDragForwardingListener.ts in the sun repository.