gui-video-clipper/chat-summaries/2026-09-22_19-13-v020-player-mode-implementation-summary.md

v0.2.0 Player Mode — Implementation Summary

Task Description

Implemented all 9 tasks from the v0.2.0 Player Mode implementation plan using subagent-driven development (SDD). This is the execution phase following the design spec and plan created in an earlier session.

Changes Made

11 commits (bd96da4..7e838dc)

Commit	Description
bd96da4	Task 1: appMode preference (clipper/player) with persistence
d9f5874	Task 2: PiP, fullscreen, playbackRate helpers in playback module
bb5fa4b	Task 3: SpeedSelector popup component
f717687	Task 4: PlayerControls floating overlay (frosted glass, seek bar, all controls)
56686a3	Task 5: PlayerTimeline simplified waveform component
d36138c	Task 6: Player/Clipper mode switching with auto-hide UI in App.svelte
199ad1c	Task 6 fix: transport shortcuts fallback via runTransportAction for Player mode
3e219b7	Task 7: Conditional CC rendering, click-to-play, bindable captionsEnabled
2472dec	Task 7 fix: bind captionsEnabled between App and VideoPlayer
1a86a34	Task 8: FLIP transitions (fly/fade + CSS grid transition)
7e838dc	Task 9: Version bump 0.1.3 → 0.2.0

Files (17 changed, +1327 −92)

New files:

• src/lib/components/PlayerControls.svelte — floating overlay with seek bar, play/pause, skip, volume, speed, CC, PiP, fullscreen
• src/lib/components/PlayerTimeline.svelte — simplified waveform-only timeline
• src/lib/components/SpeedSelector.svelte — playback speed popup (0.5x–2x)
• tests/lib/components/SpeedSelector.test.ts — 3 component tests
• tests/lib/stores/preferences.test.ts — 3 preference tests
• tests/lib/transport/playback.test.ts — 10 playback helper tests

Modified files:

• src/App.svelte — mode switching, auto-hide, keyboard shortcuts, layout conditionals
• src/app.css — grid transitions, player-mode positioning
• src/lib/components/VideoPlayer.svelte — bindable captionsEnabled, click-to-play, conditional CC
• src/lib/stores/preferences.svelte.ts — appMode field + persistence
• src/lib/transport/playback.ts — PiP, fullscreen, playbackRate exports
• vite.config.ts — svelteTesting() plugin for Svelte 5 component tests

Key Architecture Decisions

1. Single always-mounted VideoPlayer — video element stays in DOM across mode switches, avoiding destruction/recreation
2. Proximity-based auto-hide — controls: any mouse move + 3s timeout; toolbar: 50px from top; timeline: 80px from bottom
3. Transport fallback — dispatchTransport() falls back to runTransportAction() when TransportControls is null (Player mode)
4. CSS Grid transitions — .content animates grid-template changes for smooth layout shifts
5. Polling for PiP/fullscreen state — PlayerControls polls isPiPActive()/isFullscreenActive() at 500ms

Bugs Found & Fixed

1. Transport shortcuts no-op in Player mode — TransportControls not rendered → transportControls null → all playback shortcuts broken. Fixed with runTransportAction fallback.
2. captionsEnabled not bound — App.svelte and VideoPlayer had separate captionsEnabled states. Fixed with bind:captionsEnabled.

Lessons Learned

• When a component that handles keyboard dispatch is conditionally rendered, always provide a fallback path for the keyboard handler
• Svelte 5 bindable props require explicit $bindable() wrapper and typed $props() destructuring
• Svelte 5 component testing in vitest/jsdom needs svelteTesting() plugin in vite config (not documented in the plan)
• Timer-based click/double-click discrimination (250ms delay) is the standard pattern for video players

Test Results

• 8 test files, 47 tests passing
• svelte-check: 0 errors (1 pre-existing a11y warning — missing tabindex on slider role)

Follow-up Items

• Add tabindex="0" to PlayerControls seek bar slider role (a11y warning)
• Remove dead handleVideoClick() function in VideoPlayer.svelte (unused, superseded by handleVideoClickWithDelay)
• Consider event-based PiP/fullscreen state updates instead of 500ms polling
• Visual QA with npm run tauri dev for transition smoothness