Class: shaka.text.UITextDisplayer

Constructor

new UITextDisplayer(video, videoContainer)

Constructor.
Parameters:
Name Type Description
video HTMLMediaElement
videoContainer HTMLElement
Implements:
Source:

Members

aspectRatio_ :number

Type:
  • number
Source:

captionsTimer_ :shaka.util.Timer

Type:
Source:

cues_ :Array.<!shaka.text.Cue>

Type:
Source:

currentCuesMap_ :Map.<!shaka.extern.Cue, !{cueElement: !HTMLElement, regionElement: HTMLElement, wrapper: !HTMLElement}>

Maps cues to cue elements. Specifically points out the wrapper element of the cue (e.g. the HTML element to put nested cues inside).
Type:
  • Map.<!shaka.extern.Cue, !{cueElement: !HTMLElement, regionElement: HTMLElement, wrapper: !HTMLElement}>
Source:

eventManager_ :shaka.util.EventManager

Type:
Source:

isTextVisible_ :boolean

Type:
  • boolean
Source:

regionElements_ :Map.<string, !HTMLElement>

Type:
  • Map.<string, !HTMLElement>
Source:

resizeObserver_ :ResizeObserver

Type:
  • ResizeObserver
Source:

textContainer_ :HTMLElement

Type:
  • HTMLElement
Source:

video_ :HTMLMediaElement

Type:
Source:

video_ :HTMLVideoElement

Type:
  • HTMLVideoElement
Source:

videoContainer_ :HTMLElement

Type:
  • HTMLElement
Source:

Methods

convertLengthValue_(lengthValue, cuenon-null, videoContainer) → {string}

Converts length value to an absolute value in pixels. If lengthValue is already an absolute value it will not be modified. Relative lengthValue will be converted to an absolute value in pixels based on Computed Cell Size
Parameters:
Name Type Description
lengthValue string
cue shaka.extern.Cue
videoContainer HTMLElement
Source:
Returns:
Type
string

getAbsoluteLengthInPixels_(value, cuenon-null, videoContainer) → {string}

Returns computed absolute length value in pixels based on cell and a video container size
Parameters:
Name Type Description
value number
cue shaka.extern.Cue
videoContainer HTMLElement
Source:
Returns:
Type
string

getLengthValueInfo_(lengthValuenullable) → {?{ value: number, unit: string }}

Returns info about provided lengthValue
Parameters:
Name Type Attributes Description
lengthValue string <nullable>
Source:
Returns:
Type
?{ value: number, unit: string }
Example
100px => { value: 100, unit: 'px' }

inheritProperty_(parentsnon-null, cb) → {T}

Inherits a property from the parent Cue elements. If the value is falsy, it is assumed to be inherited from the parent. This returns null if the value isn't found.
Parameters:
Name Type Description
parents Array.<!shaka.extern.Cue>
cb function(!shaka.extern.Cue):?T
Source:
Returns:
Type
T

append(cuesnon-null)

Append given text cues to the list of cues to be displayed.
Parameters:
Name Type Description
cues Array.<!shaka.text.Cue> Text cues to be appended.
Implements:
Source:

computeCuePositionAlignment_(cuenon-null)

Compute cue position alignment See https://www.w3.org/TR/webvtt1/#webvtt-cue-position-alignment
Parameters:
Name Type Description
cue shaka.extern.Cue
Source:

createCue_(cuenon-null, parentsnon-null)

Creates the object for a cue.
Parameters:
Name Type Description
cue shaka.extern.Cue
parents Array.<!shaka.extern.Cue>
Source:

generateRegionId_(region)

Compute a unique internal id: Regions can reuse the id but have different dimensions, we need to consider those differences
Parameters:
Name Type Description
region shaka.extern.CueRegion
Source:

getRegionElement_(cuenon-null) → {HTMLElement}

Get or create a region element corresponding to the cue region. These are cached by ID.
Parameters:
Name Type Description
cue shaka.extern.Cue
Source:
Returns:
Type
HTMLElement

isElementUnderTextContainer_()

Source:

isTextVisible() → {boolean}

Returns true if text is currently visible.
Implements:
Source:
Returns:
Type
boolean

remove(startTime, endTime) → {boolean}

Remove all cues that are fully contained by the given time range (relative to the presentation). endTime will be greater to equal to startTime. remove should only return false if the displayer has been destroyed. If the displayer has not been destroyed remove should return true.
Parameters:
Name Type Description
startTime number
endTime number
Implements:
Source:
Returns:
Type
boolean

setCaptionStyles_(cueElementnon-null, cuenon-null, parentsnon-null, hasWrapper)

Parameters:
Name Type Description
cueElement HTMLElement
cue shaka.extern.Cue
parents Array.<!shaka.extern.Cue>
hasWrapper boolean
Source:

setTextVisibility(on)

Set text visibility.
Parameters:
Name Type Description
on boolean
Implements:
Source:

updateCaptions_(forceUpdateopt)

Display the current captions.
Parameters:
Name Type Attributes Default Description
forceUpdate boolean <optional>
 false
Source:

updateCuesRecursive_(cuesnon-null, containernon-null, currentTime, parentsnon-null)

Parameters:
Name Type Description
cues Array.<!shaka.extern.Cue>
container HTMLElement
currentTime number
parents Array.<!shaka.extern.Cue>
Source: