led2/.planning/phases/05-live-show-execution/05-03-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
05-live-show-execution	03	ui	keyboard-shortcuts vanilla-js undo-redo audio websocket	phase provides 05-01 Cue scheduler backend for play/pause/seek server messages phase provides 05-02 Preview strips for seek-clear pattern	wireKeyboard() — all 7 keyboard bindings (Space, ArrowLeft, ArrowRight, Ctrl+Z, Ctrl+Shift+Z, Ctrl+Y, Ctrl+S) Mouse-free operation of all primary actions per UI-03 requirement		added patterns Keyboard guard pattern: check activeElement tagName before acting (input/select/textarea bypass) Space-on-button guard: explicit check for tag === 'button' to prevent double-toggle Ctrl+S round-trip save: GET current show state → POST to /api/shows (manual trigger) Arrow seek with strip clear: same clear pattern as mouseup seek from Plan 02	created modified lightsync/frontend/app.js	e.preventDefault() called first in every branch — suppresses Space scroll, Arrow scroll, Ctrl+S browser dialog before any logic Space explicitly guarded on button elements to avoid double-toggle with button click handler Ctrl+S uses GET-then-POST round-trip (reads current server state, not just timeline) — consistent with existing save pattern	wireKeyboard() placed after wireAudio() in init section — both audio wiring functions called together at startup Arrow seek clears preview strips inline — same pattern as mouseup seek handler	UI-03	10min	2026-04-07

Phase 05 Plan 03: Keyboard Shortcuts Summary

wireKeyboard() function wired with all 7 keyboard bindings (Space play/pause, Arrow seek, Ctrl+Z/Y undo/redo, Ctrl+S save) — all primary operations accessible without mouse

Performance

• Duration: ~10 min
• Completed: 2026-04-07
• Tasks: 1
• Files modified: 1

Accomplishments

• Added wireKeyboard() function to lightsync/frontend/app.js (72 lines inserted)
• Space toggles audio play/pause and sends { type: 'play' } or { type: 'pause' } to server via WebSocket
• ArrowLeft seeks back 5 seconds, ArrowRight seeks forward 5 seconds — both send { type: 'seek', position } to server and clear all preview strips
• Ctrl+Z calls timeline?.history.undo() via optional chaining (safe when timeline not yet initialized)
• Ctrl+Shift+Z and Ctrl+Y both call timeline?.history.redo()
• Ctrl+S prevents browser Save dialog via e.preventDefault(), then fetches current show and POSTs it back to /api/shows
• All shortcuts are suppressed when document.activeElement is an input, select, or textarea
• Space is additionally suppressed when focused element is a button to prevent double-toggle with click handler
• wireKeyboard() called at init after wireAudio()

Task Commits

1. Task 1: Add wireKeyboard() function and call it at init - 3562652 (feat)

Files Created/Modified

• lightsync/frontend/app.js — Added wireKeyboard() function (72 lines) and wireKeyboard() init call

Decisions Made

• e.preventDefault() is called at the start of every key branch to guarantee browser defaults are suppressed before any application logic runs
• Space on <button> elements is explicitly skipped to prevent the double-toggle issue (keyboard Space activates focused buttons naturally; without the guard, Space would trigger both the button click and the wireKeyboard toggle)
• Ctrl+S uses a GET-then-POST round-trip rather than saving the in-memory timeline state directly — this ensures the server's current show state is preserved (consistent with existing auto-save pattern in commands.js)

Deviations from Plan

None — plan executed exactly as written. All acceptance criteria met on first implementation pass.

Known Stubs

None — all keyboard actions wire to real audio element methods, real WebSocket messages, and real undo/redo history calls.

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Phase: 05-live-show-execution Completed: 2026-04-07