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feat: add transport controls and keyboard shortcuts

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Centralize seek/play/frame/shuttle in playback helpers, wire the transport bar, and handle global shortcuts from App.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
cottongin
2026-09-21 11:08:16 -04:00
parent c13755e5d1
commit 2f25db3cc5
3 changed files with 318 additions and 5 deletions
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119
src/lib/components/TransportControls.svelte
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@@ -1,5 +1,76 @@
<script lang="ts">
import { session } from '$lib/stores/videoSession.svelte';
import { markInPoint, markOutPoint } from '$lib/stores/clips.svelte';
import { formatTime } from '$lib/utils/time';
import {
jumpKeyframe,
runTransportAction,
seekBy,
stepFrame,
togglePlayPause,
type TransportKeyAction,
} from '$lib/transport/playback';
let hasKeyframes = $derived(session.keyframePositions.length > 0);
export function handleKeyAction(action: TransportKeyAction) {
runTransportAction(action, markInPoint, markOutPoint);
}
</script>
<div class="transport-controls">
<span class="placeholder-text">Transport controls</span>
<div class="buttons">
<button
onclick={() => jumpKeyframe(-1)}
disabled={!hasKeyframes}
title="Previous keyframe (Shift+,)"
type="button"
>
◄K
</button>
<button onclick={() => seekBy(-5)} title="Seek back 5s (←)" type="button">-5s</button>
<button onclick={() => seekBy(-1)} title="Seek back 1s (Shift+←)" type="button">-1s</button>
<button onclick={() => stepFrame(-1)} title="Previous frame (,)" type="button">◄|</button>
<button onclick={togglePlayPause} title="Play/Pause (Space / K)" type="button">
{session.isPlaying ? '❚❚' : '▶'}
</button>
<button onclick={() => stepFrame(1)} title="Next frame (.)" type="button">|►</button>
<button onclick={() => seekBy(1)} title="Seek forward 1s (Shift+→)" type="button">+1s</button>
<button onclick={() => seekBy(5)} title="Seek forward 5s (→)" type="button">+5s</button>
<button
onclick={() => jumpKeyframe(1)}
disabled={!hasKeyframes}
title="Next keyframe (Shift+.)"
type="button"
>
K►
</button>
</div>
<div class="time-display">
<span class="current">{formatTime(session.currentTime)}</span>
<span class="separator">/</span>
<span class="total">{formatTime(session.duration)}</span>
</div>
<div class="mark-buttons">
<button
class="mark-btn"
onclick={() => markInPoint(session.currentTime)}
title="Set in-point (I)"
type="button"
>
I
</button>
<button
class="mark-btn"
onclick={() => markOutPoint(session.currentTime)}
title="Set out-point (O)"
type="button"
>
O
</button>
</div>
</div>
<style>
@@ -10,10 +81,50 @@
background: var(--bg-secondary);
border-top: 1px solid var(--border);
border-bottom: 1px solid var(--border);
min-height: 40px;
gap: 16px;
}
.placeholder-text {
color: var(--text-muted);
.buttons {
display: flex;
gap: 4px;
flex-wrap: wrap;
}
.buttons button {
font-size: 13px;
padding: 4px 8px;
min-width: 32px;
}
.time-display {
font-family: var(--font-mono);
font-size: 14px;
}
.current {
color: var(--text-primary);
}
.separator {
color: var(--text-muted);
margin: 0 4px;
}
.total {
color: var(--text-secondary);
}
.mark-buttons {
margin-left: auto;
display: flex;
gap: 4px;
}
.mark-btn {
font-weight: 700;
font-size: 14px;
padding: 4px 12px;
background: var(--bg-tertiary);
border: 1px solid var(--border);
}
</style>

116
src/lib/transport/playback.ts Normal file
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@@ -0,0 +1,116 @@
import { session } from '$lib/stores/videoSession.svelte';
export function seekTo(time: number) {
const clamped = Math.max(0, Math.min(time, session.duration));
session.currentTime = clamped;
const videoEl = document.querySelector('video');
if (videoEl) {
videoEl.currentTime = clamped;
}
}
export function seekBy(seconds: number) {
seekTo(session.currentTime + seconds);
}
export function togglePlayPause() {
const videoEl = document.querySelector('video');
if (!videoEl) return;
if (videoEl.paused) {
void videoEl.play();
} else {
videoEl.pause();
}
}
export function stepFrame(direction: 1 | -1) {
const videoEl = document.querySelector('video');
if (videoEl && !videoEl.paused) {
videoEl.pause();
}
seekTo(session.currentTime + direction * (1 / session.fps));
}
export function jumpKeyframe(direction: 1 | -1) {
if (session.keyframePositions.length === 0) return;
const positions = session.keyframePositions;
if (direction > 0) {
const next = positions.find((p) => p > session.currentTime + 0.01);
if (next !== undefined) seekTo(next);
} else {
const prev = [...positions].reverse().find((p) => p < session.currentTime - 0.01);
if (prev !== undefined) seekTo(prev);
}
}
export function adjustShuttle(dir: 1 | -1, shuttleRate: number): number {
const videoEl = document.querySelector('video');
if (!videoEl) return shuttleRate;
const nextRate = Math.max(0.25, Math.min(4, shuttleRate + dir * 0.5));
videoEl.playbackRate = nextRate;
if (videoEl.paused) {
void videoEl.play();
}
return nextRate;
}
export type TransportKeyAction =
| 'play-pause'
| 'frame-back'
| 'frame-forward'
| 'keyframe-back'
| 'keyframe-forward'
| 'seek-back-5'
| 'seek-forward-5'
| 'seek-back-1'
| 'seek-forward-1'
| 'mark-in'
| 'mark-out';
export function runTransportAction(
action: TransportKeyAction,
markIn: (time: number) => void,
markOut: (time: number) => void
) {
switch (action) {
case 'play-pause':
togglePlayPause();
break;
case 'frame-back':
stepFrame(-1);
break;
case 'frame-forward':
stepFrame(1);
break;
case 'keyframe-back':
jumpKeyframe(-1);
break;
case 'keyframe-forward':
jumpKeyframe(1);
break;
case 'seek-back-5':
seekBy(-5);
break;
case 'seek-forward-5':
seekBy(5);
break;
case 'seek-back-1':
seekBy(-1);
break;
case 'seek-forward-1':
seekBy(1);
break;
case 'mark-in':
markIn(session.currentTime);
break;
case 'mark-out':
markOut(session.currentTime);
break;
default: {
const _exhaustive: never = action;
void _exhaustive;
}
}
}