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Ensure media is always visible and segments are followed dynamically. #3

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Ensure media is always visible and segments are followed dynamically. #3

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42 changes: 29 additions & 13 deletions src/WhisperTranscript.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,10 +11,15 @@ export class WhisperTranscript extends LitElement {
ul {
list-style: none;
padding-left: 0;
overflow-y: auto;
max-height: 400px;
}

.media {
text-align: center;
position: sticky;
top: 0;
z-index: 10;
}

.whisper-transcript {
Expand All @@ -40,35 +45,46 @@ export class WhisperTranscript extends LitElement {
super.connectedCallback();
this.getTranscript();

const that = this;
window.addEventListener('update-time', e => that.time = e.detail.time);
window.addEventListener('update-time', (e) => this.updateTime(e.detail.time));
}

async getTranscript() {
const resp = await fetch(this.url);
this.transcript = await resp.json();
}

updateTime(currentTime) {
this.time = currentTime;
this.requestUpdate();
this.scrollToActiveSegment();
}

scrollToActiveSegment() {
const activeSegment = this.shadowRoot.querySelector('.active');
if (activeSegment) {
activeSegment.scrollIntoView({ behavior: 'smooth', block: 'center' });
}
}

render() {
if (! this.transcript) {
return html`Loading...`;
}

let media = null;
if (this.audio) {
media = html`<whisper-media audio="${this.audio}"></whisper-media>`;
} else {
media = html`<whisper-media video="${this.video}"></whisper-media>`;
}
const media = this.audio
? html`<whisper-media audio="${this.audio}"></whisper-media>`
: html`<whisper-media video="${this.video}"></whisper-media>`;

return html`
<div class="whisper-transcript">
<div class="media">
${media}
</div>
<div class="media">${media}</div>
<ul>
${this.transcript.segments.map(s =>
html`<whisper-segment .words="${s.words}" start="${s.start}" end="${s.end}" text="${s.text}" />`
${this.transcript.segments.map(
(s) => html`
<whisper-segment class="${this.time >= s.start && this.time <= s.end ? 'active' : ''}" .words="${s.words}"
start="${s.start}" end="${s.end}" text="${s.text}"
/>
`
)}
</ul>
</div>
Expand Down