GrabDragUsageTracker¶

Overview¶

The model of the grab drag cueing logic. This is a separate model in part so that different interaction instances can share the same info about whether the cues should be shown.

@author Michael Kauzmann (PhET Interactive Simulations) @author Jesse Greenberg (PhET Interactive Simulations) @author Sam Reid (PhET Interactive Simulations)

Class GrabDragUsageTracker¶

import { GrabDragUsageTracker } from 'scenerystack/scenery-phet';

Instance Methods¶

reset()¶

Instance Properties¶

numberOfGrabs¶

The number of times the component has been picked up for dragging, regardless of pickup method for things like determining content for "hints" describing the interaction to the user

numberOfKeyboardGrabs¶

The number of times this component has been picked up with a keyboard specifically to provide hints specific to alternative input.

shouldShowDragCue¶

Clients can provide application-specific logic for when to show the drag cue. Typically, they will want to hide it after the user has interacted with it in a certain way.

Source Code¶

See the source for GrabDragUsageTracker.ts in the scenery-phet repository.