ImageManager

Defined in: src/render/image_manager.ts:40

ImageManager does three things:

1. Tracks requests for icon images from tile workers and sends responses when the requests are fulfilled.
2. Builds a texture atlas for pattern images.
3. Rerenders renderable images once per frame

These are disparate responsibilities and should eventually be handled by different classes. When we implement data-driven support for *-pattern, we'll likely use per-bucket pattern atlases, and that would be a good time to refactor this.

Extends

• Evented

Methods

listens()

listens(type: string): boolean

Defined in: src/util/evented.ts:165

Returns a true if this instance of Evented or any forwardeed instances of Evented have a listener for the specified type.

Parameters

Parameter	Type	Description
type	string	The event type

Returns

boolean

true if there is at least one registered listener for specified event type, false otherwise

Inherited from

Evented.listens

---

off()

off(type: string, listener: Listener): ImageManager

Defined in: src/util/evented.ts:90

Removes a previously registered event listener.

Parameters

Parameter	Type	Description
type	string	The event type to remove listeners for.
listener	Listener	The listener function to remove.

Returns

ImageManager

Inherited from

Evented.off

---

on()

on(type: string, listener: Listener): Subscription

Defined in: src/util/evented.ts:73

Adds a listener to a specified event type.

Parameters

Parameter	Type	Description
type	string	The event type to add a listen for.
listener	Listener	The function to be called when the event is fired. The listener function is called with the data object passed to fire, extended with target and type properties.

Returns

Subscription

Inherited from

Evented.on

---

once()

once(type: string, listener?: Listener): Promise<any> | ImageManager

Defined in: src/util/evented.ts:106

Adds a listener that will be called only once to a specified event type.

The listener will be called first time the event fires after the listener is registered.

Parameters

Parameter	Type	Description
type	string	The event type to listen for.
listener?	Listener	The function to be called when the event is fired the first time.

Returns

Promise<any> | ImageManager

this or a promise if a listener is not provided

Inherited from

Evented.once

---

setEventedParent()

setEventedParent(parent?: Evented, data?: any): ImageManager

Defined in: src/util/evented.ts:176

Bubble all events fired by this instance of Evented to this parent instance of Evented.

Parameters

Parameter	Type
parent?	Evented
data?	any

Returns

ImageManager

Inherited from

Evented.setEventedParent

Properties

requestors

requestors: object[]

Defined in: src/render/image_manager.ts:49

This is used to track requests for images that are not yet available. When the image is loaded, the requestors will be notified.

ids

ids: string[]

promiseResolve()

promiseResolve: (value: GetImagesResponse) => void

Parameters

Parameter	Type
value	GetImagesResponse

Returns

void