Accessibility Module

Version 0.10.0

Overview

The Accessibility module provides access to the user/device settings for closed captioning and voice guidance.

Apps SHOULD attempt o respect these settings, rather than manage and persist seprate settings, which would be different per-app.

OpenRPC

Firebolt APIs are maintained in the rdkcentral/firebolt-core-sdk GitHub repository.

You can see this API in the accessibility.json OpenRPC JSON-Schema document.

Table of Contents

 

Usage

To use the Accessibility module, you can import it into your project from the Firebolt SDK:

import { Accessibility } from '@firebolt-js/sdk'

Methods

closedCaptions

This API is deprecated since version 0.6.0. Use Accessibility.closedCaptionsSettings() instead.

Get the user’s preferred closed-captions settings

function closedCaptions(): Promise<ClosedCaptionsSettings>

Promise resolution:

Type Description
ClosedCaptionsSettings the closed captions settings

Examples

Getting the closed captions settings

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.closedCaptions()
    .then(closedCaptionsSettings => {
        console.log(closedCaptionsSettings)
    })

Value of closedCaptionsSettings:

{
  "enabled": true,
  "styles": {
    "fontFamily": "Monospace sans-serif",
    "fontSize": 1,
    "fontColor": "#ffffff",
    "fontEdge": "none",
    "fontEdgeColor": "#7F7F7F",
    "fontOpacity": 100,
    "backgroundColor": "#000000",
    "backgroundOpacity": 100,
    "textAlign": "center",
    "textAlignVertical": "middle"
  }
}
JSON-RPC:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accessibility.closedCaptions",
  "params": {}
}

Response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": true,
    "styles": {
      "fontFamily": "Monospace sans-serif",
      "fontSize": 1,
      "fontColor": "#ffffff",
      "fontEdge": "none",
      "fontEdgeColor": "#7F7F7F",
      "fontOpacity": 100,
      "backgroundColor": "#000000",
      "backgroundOpacity": 100,
      "textAlign": "center",
      "textAlignVertical": "middle"
    }
  }
}

closedCaptionsSettings

Get the user’s preferred closed-captions settings

To get the value of closedCaptionsSettings call the method like this:

function closedCaptionsSettings(): Promise<ClosedCaptionsSettings>

Promise resolution:

Type Description
ClosedCaptionsSettings the closed captions settings

Examples

Getting the closed captions settings

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.closedCaptionsSettings()
    .then(closedCaptionsSettings => {
        console.log(closedCaptionsSettings)
    })

Value of closedCaptionsSettings:

{
  "enabled": true,
  "styles": {
    "fontFamily": "Monospace sans-serif",
    "fontSize": 1,
    "fontColor": "#ffffff",
    "fontEdge": "none",
    "fontEdgeColor": "#7F7F7F",
    "fontOpacity": 100,
    "backgroundColor": "#000000",
    "backgroundOpacity": 100,
    "textAlign": "center",
    "textAlignVertical": "middle"
  }
}
JSON-RPC:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accessibility.closedCaptionsSettings",
  "params": {}
}

Response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": true,
    "styles": {
      "fontFamily": "Monospace sans-serif",
      "fontSize": 1,
      "fontColor": "#ffffff",
      "fontEdge": "none",
      "fontEdgeColor": "#7F7F7F",
      "fontOpacity": 100,
      "backgroundColor": "#000000",
      "backgroundOpacity": 100,
      "textAlign": "center",
      "textAlignVertical": "middle"
    }
  }
}

To set the value of closedCaptionsSettings call the method like this:

function closedCaptionsSettings(): Promise<ListenResponse | ClosedCaptionsSettings>

Parameters:

Param Type Required Summary

Promise resolution:

Type Summary
void Promise resolves with no value when the operation is complete.

Examples

Getting the closed captions settings

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.closedCaptionsSettings(true)
JSON-RPC:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accessibility.closedCaptionsSettings",
  "params": {}
}

Response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": true,
    "styles": {
      "fontFamily": "Monospace sans-serif",
      "fontSize": 1,
      "fontColor": "#ffffff",
      "fontEdge": "none",
      "fontEdgeColor": "#7F7F7F",
      "fontOpacity": 100,
      "backgroundColor": "#000000",
      "backgroundOpacity": 100,
      "textAlign": "center",
      "textAlignVertical": "middle"
    }
  }
}

To subscribe to notifications when the value changes, call the method like this:

function closedCaptionsSettings (subscriber: () => void): Promise<listenerId>

Parameters:

Param Type Required Summary
     
subscriber function Yes Callback to execute when the value changes.

Promise resolution:

Type Summary
listenerId The id of the listener that can be used with Accessibility.clear(listenerId) to unsubscribe

Callback parameters:

Param Type Required Summary
`    

Examples

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.closedCaptionsSettings((value) => {
  // property value was changed
  console.log(value)
}).then(listenerId => {
  // you can clear this listener w/ Accessibility.clear(listenerId)
})

value of value:

JSON-RPC:

Request:

Response:

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "listening": "true"
  }
}

listen

Listen for events from this module.

To listen to a specific event pass the event name as the first parameter:

Accessibility.listen(event: string, (data: any) => void): Promise<number>

Parameters:

Param Type Required Summary
event string Yes The event to listen for, see Events.
callback function Yes A function that will be invoked when the event occurs.

Promise resolution:

Type Description
number Listener ID to clear the callback method and stop receiving the event, e.g. Accessibility.clear(id)

Callback parameters:

Param Type Required Summary
data any Yes The event data, which depends on which event is firing, see Events.

To listen to all events from this module pass only a callback, without specifying an event name:

Accessibility.listen((event: string, data: any) => void): Promise<number>

Parameters:

Param Type Required Summary
callback function Yes A function that will be invoked when the event occurs. The event data depends on which event is firing, see Events.

Callback parameters:

Param Type Required Summary
event string Yes The event that has occured listen for, see Events.
data any Yes The event data, which depends on which event is firing, see Events.

Promise resolution:

Type Description
number Listener ID to clear the callback method and stop receiving the event, e.g. Accessibility.clear(id)

See Listening for events for more information and examples.


once

Listen for only one occurance of an event from this module. The callback will be cleared after one event.

To listen to a specific event pass the event name as the first parameter:

Accessibility.once(event: string, (data: any) => void): Promise<number>

Parameters:

Param Type Required Summary
event string Yes The event to listen for, see Events.
callback function Yes A function that will be invoked when the event occurs.

Promise resolution:

Type Description
number Listener ID to clear the callback method and stop receiving the event, e.g. Accessibility.clear(id)

Callback parameters:

Param Type Required Summary
data any Yes The event data, which depends on which event is firing, see Events.

To listen to all events from this module pass only a callback, without specifying an event name:

Accessibility.once((event: string, data: any) => void): Promise<number>

Parameters:

Param Type Required Summary
callback function Yes A function that will be invoked when the event occurs. The event data depends on which event is firing, see Events.

Callback parameters:

Param Type Required Summary
event string Yes The event that has occured listen for, see Events.
data any Yes The event data, which depends on which event is firing, see Events.

Promise resolution:

Type Description
number Listener ID to clear the callback method and stop receiving the event, e.g. Accessibility.clear(id)

See Listening for events for more information and examples.


voiceGuidance

This API is deprecated since version 0.6.0. Use Accessibility.voiceGuidanceSettings() instead.

Get the user’s preferred voice guidance settings

function voiceGuidance(): Promise<VoiceGuidanceSettings>

Promise resolution:

Type Description
VoiceGuidanceSettings the voice guidance settings

Examples

Getting the voice guidance settings

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.voiceGuidance()
    .then(settings => {
        console.log(settings)
    })

Value of settings:

{
  "enabled": true,
  "speed": 5
}
JSON-RPC:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accessibility.voiceGuidance",
  "params": {}
}

Response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": true,
    "speed": 5
  }
}

voiceGuidanceSettings

Get the user’s preferred voice guidance settings

To get the value of voiceGuidanceSettings call the method like this:

function voiceGuidanceSettings(): Promise<VoiceGuidanceSettings>

Promise resolution:

Type Description
VoiceGuidanceSettings the voice guidance settings

Examples

Getting the voice guidance settings

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.voiceGuidanceSettings()
    .then(settings => {
        console.log(settings)
    })

Value of settings:

{
  "enabled": true,
  "speed": 5
}
JSON-RPC:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accessibility.voiceGuidanceSettings",
  "params": {}
}

Response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": true,
    "speed": 5
  }
}

To set the value of voiceGuidanceSettings call the method like this:

function voiceGuidanceSettings(): Promise<ListenResponse | VoiceGuidanceSettings>

Parameters:

Param Type Required Summary

Promise resolution:

Type Summary
void Promise resolves with no value when the operation is complete.

Examples

Getting the voice guidance settings

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.voiceGuidanceSettings(true)
JSON-RPC:

Request:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "accessibility.voiceGuidanceSettings",
  "params": {}
}

Response:

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": true,
    "speed": 5
  }
}

To subscribe to notifications when the value changes, call the method like this:

function voiceGuidanceSettings (subscriber: () => void): Promise<listenerId>

Parameters:

Param Type Required Summary
     
subscriber function Yes Callback to execute when the value changes.

Promise resolution:

Type Summary
listenerId The id of the listener that can be used with Accessibility.clear(listenerId) to unsubscribe

Callback parameters:

Param Type Required Summary
`    

Examples

JavaScript:

import { Accessibility } from '@firebolt-js/sdk'

Accessibility.voiceGuidanceSettings((value) => {
  // property value was changed
  console.log(value)
}).then(listenerId => {
  // you can clear this listener w/ Accessibility.clear(listenerId)
})

value of value:

JSON-RPC:

Request:

Response:

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "listening": "true"
  }
}

Events

Additional events

The following events are documented as part of a related set of method APIs.

For more information, follow the links under the “Documentation” column.

JavaScript RPC Payload Documentation
osedCaptionsSettings closedCaptionsSettings ListenResponse closedCaptionsSettings
iceGuidanceSettings voiceGuidanceSettings ListenResponse voiceGuidanceSettings

Schemas

VoiceGuidanceSettings

type VoiceGuidanceSettings = {
  enabled: boolean              // Whether or not voice guidance should be enabled by default
  speed: number                 // The speed at which voice guidance speech will be read back to the user
}

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