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// ==========================================================================
// Plyr Captions
// ==========================================================================
import support from './support';
import utils from './utils';
import controls from './controls';
import storage from './storage';
const captions = {
// Setup captions
setup() {
// Requires UI support
if (!this.supported.ui) {
return;
}
// Set default language if not set
if (!utils.is.empty(storage.get.call(this).language)) {
this.captions.language = storage.get.call(this).language;
} else if (utils.is.empty(this.captions.language)) {
this.captions.language = this.config.captions.language.toLowerCase();
}
// Set captions enabled state if not set
if (!utils.is.boolean(this.captions.enabled)) {
if (!utils.is.empty(storage.get.call(this).language)) {
this.captions.enabled = storage.get.call(this).captions;
} else {
this.captions.enabled = this.config.captions.active;
}
}
// Only Vimeo and HTML5 video supported at this point
if (!['video', 'vimeo'].includes(this.type) || (this.type === 'video' && !support.textTracks)) {
this.captions.tracks = null;
// Clear menu and hide
if (this.config.controls.includes('settings') && this.config.settings.includes('captions')) {
controls.setCaptionsMenu.call(this);
}
return;
}
// Inject the container
if (!utils.is.htmlElement(this.elements.captions)) {
this.elements.captions = utils.createElement(
'div',
utils.getAttributesFromSelector(this.config.selectors.captions)
);
utils.insertAfter(this.elements.captions, this.elements.wrapper);
}
// Get tracks from HTML5
if (this.type === 'video') {
this.captions.tracks = this.media.textTracks;
}
// Set the class hook
utils.toggleClass(
this.elements.container,
this.config.classNames.captions.enabled,
!utils.is.empty(this.captions.tracks)
);
// If no caption file exists, hide container for caption text
if (utils.is.empty(this.captions.tracks)) {
return;
}
// Enable UI
captions.show.call(this);
// Get a track
const setCurrentTrack = () => {
// Reset by default
this.captions.currentTrack = null;
// Filter doesn't seem to work for a TextTrackList :-(
Array.from(this.captions.tracks).forEach(track => {
if (track.language === this.captions.language.toLowerCase()) {
this.captions.currentTrack = track;
}
});
};
// Get current track
setCurrentTrack();
// If we couldn't get the requested language, revert to default
if (!utils.is.track(this.captions.currentTrack)) {
const { language } = this.config.captions;
// Reset to default
// We don't update user storage as the selected language could become available
this.captions.language = language;
// Get fallback track
setCurrentTrack();
// If no match, disable captions
if (!utils.is.track(this.captions.currentTrack)) {
this.toggleCaptions(false);
}
controls.updateSetting.call(this, 'captions');
}
// Setup HTML5 track rendering
if (this.type === 'video') {
// Turn off native caption rendering to avoid double captions
Array.from(this.captions.tracks).forEach(track => {
// Remove previous bindings (if we've changed source or language)
utils.off(track, 'cuechange', event => captions.setCue.call(this, event));
// Hide captions
// eslint-disable-next-line
track.mode = 'hidden';
});
// Check if suported kind
const supported =
this.captions.currentTrack && ['captions', 'subtitles'].includes(this.captions.currentTrack.kind);
if (utils.is.track(this.captions.currentTrack) && supported) {
utils.on(this.captions.currentTrack, 'cuechange', event => captions.setCue.call(this, event));
// If we change the active track while a cue is already displayed we need to update it
if (this.captions.currentTrack.activeCues && this.captions.currentTrack.activeCues.length > 0) {
captions.setCue.call(this, this.captions.currentTrack);
}
}
} else if (this.type === 'vimeo' && this.captions.active) {
this.embed.enableTextTrack(this.captions.language);
}
// Set available languages in list
if (this.config.controls.includes('settings') && this.config.settings.includes('captions')) {
controls.setCaptionsMenu.call(this);
}
},
// Display active caption if it contains text
setCue(input) {
// Get the track from the event if needed
const track = utils.is.event(input) ? input.target : input;
const active = track.activeCues[0];
// Display a cue, if there is one
if (utils.is.cue(active)) {
captions.set.call(this, active.getCueAsHTML());
} else {
captions.set.call(this);
}
utils.dispatchEvent.call(this, this.media, 'cuechange');
},
// Set the current caption
set(input) {
// Requires UI
if (!this.supported.ui) {
return;
}
if (utils.is.htmlElement(this.elements.captions)) {
const content = utils.createElement('span');
// Empty the container
utils.emptyElement(this.elements.captions);
// Default to empty
const caption = !utils.is.undefined(input) ? input : '';
// Set the span content
if (utils.is.string(caption)) {
content.textContent = caption.trim();
} else {
content.appendChild(caption);
}
// Set new caption text
this.elements.captions.appendChild(content);
} else {
this.warn('No captions element to render to');
}
},
// Display captions container and button (for initialization)
show() {
// If there's no caption toggle, bail
if (!utils.is.htmlElement(this.elements.buttons.captions)) {
return;
}
// Try to load the value from storage
let active = storage.get.call(this).captions;
// Otherwise fall back to the default config
if (!utils.is.boolean(active)) {
({ active } = this.config.captions);
} else {
this.captions.active = active;
}
if (active) {
utils.toggleClass(this.elements.container, this.config.classNames.captions.active, true);
utils.toggleState(this.elements.buttons.captions, true);
}
},
};
export default captions;
|
