How to understand the EventDispatcher class in LayaAir

This article will explain in detail how to understand the EventDispatcher class in LayaAir. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

The EventDispatcher class, which inherits from the Object class, is the base class for all classes that can schedule events.

Common Node classes, such as the underlying node, also inherit from this class.

As long as you inherit this class, you can act as an event sender and send the event to its listener.

Main methods:

/ / whether there is a listener of the specified type

HasListener (type: string): boolean

/ / dispatch events

Event (type: string, data?: any): boolean

/ / listen for events

On (type: string, caller: any, listener: Function, args?: Array): EventDispatcher

/ / listen for an event

Once (type: string, caller: any, listener: Function, args?: Array): EventDispatcher

/ / remove monitoring

Off (type: string, caller: any, listener: Function, onceOnly?: boolean): EventDispatcher

/ / if onceOnly is true, only listeners added through the once method are removed

/ / remove all specified types of snooping

OffAll (type?: string): EventDispatcher

/ / if type is null, remove all types of listeners from this object

/ / determine whether the event type is a mouse event

IsMouseEvent (type: string): boolean

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