TrailVisibilityTracker¶

Overview¶

Broadcasts when any Node or its ancestors in a Trail change visibility, effectively observing changes to Trail.isVisible().

@author Jesse Greenberg

Class TrailVisibilityTracker¶

import { TrailVisibilityTracker } from 'scenerystack/scenery';

Constructor¶

new TrailVisibilityTracker( trail, options )¶

Instance Methods¶

addListener( listener )¶

Adds a listener function that will be synchronously called whenever the visibility this Trail changes. @public

@param {Function} listener - Listener will be called with no arguments.

removeListener( listener )¶

Removes a listener that was previously added with addListener(). @public

@param {Function} listener

dispose()¶

@public

onVisibilityChange()¶

When visibility of the Trail is changed, notify listeners. @private

notifyListeners()¶

Notify listeners to a change in visibility. @private

Source Code¶

See the source for TrailVisibilityTracker.js in the scenery repository.