feat: hiển thị ghost note trong piano roll tab
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# Plan: MIDI Ghost Notes + Dropdown Item Switcher + Session Sync Mode
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## Overview
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Three features built on each other:
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1. **Dropdown** at tab title position listing ALL MIDI items across all tracks
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2. **Item switching** — selected item becomes editable, all others become ghost notes
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3. **Session sync mode toggle** — viewport aligns with session bars (ghost visible) or resets to bar 0 (isolated, no ghost)
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---
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## Key Design Decisions
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### A. Ghost note scope = all items except the selected one
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Not just "other tracks" — ALL MIDI items in `activeTracks` except the one matching `targetItemId` contribute ghost notes if overlapping.
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### B. Two viewport modes, togglable
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| Mode | Viewport origin | Ghost notes | Bar labels |
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|------|----------------|-------------|------------|
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| **Session Sync** (default) | `item.startTime / secondsPerBar` | Visible | `Bar N` (session-absolute) |
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| **Isolated** | bar 0 | Hidden | `Bar N` (0-based) |
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### C. Ghost notes computed (not persisted)
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No schema changes. Extraction runs in `useMemo` inside `PianoRollTabEditor`.
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### D. Hit-testing exclusion is automatic
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Ghost notes are in separate `ghostLayers` state; mouse handlers only iterate `notes`.
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---
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## Files to Modify
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| File | Change |
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|------|--------|
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| **NEW** `app/static/js/services/ghostNoteExtractor.js` | Extraction logic |
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| `app/static/js/app.jsx` (~16113) | Pass `activeTracks` prop to `PianoRollTabEditor` |
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| `app/static/js/app.jsx` (~4563-6070) | All PianoRollTabEditor changes below |
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---
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## Step-by-Step Implementation
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### Step 1: Create `ghostNoteExtractor.js`
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`app/static/js/services/ghostNoteExtractor.js`
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```js
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export function extractGhostLayers(activeTracks, targetTrackId, targetItemId, bpm)
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```
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Algorithm:
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1. `secondsPerBeat = 60 / bpm`
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2. Find `targetItem` across all tracks → `windowStartBeat = targetItem.startTime / secondsPerBeat`, `windowEndBeat = (targetItem.startTime + targetItem.duration) / secondsPerBeat`
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3. Iterate ALL tracks, ALL MIDI items:
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- Skip non-MIDI tracks (`!t.midiItems || !t.midiItems.length`)
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- Skip muted tracks (`t.muted`)
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- Skip item matching `targetItemId` (the active item)
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4. For each candidate item:
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- `itemStartBeat = item.startTime / secondsPerBeat`
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- `itemEndBeat = (item.startTime + item.duration) / secondsPerBeat`
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- Overlap test: `itemStartBeat < windowEndBeat && itemEndBeat > windowStartBeat`
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- For each overlapping note:
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- `noteAbsStart = itemStartBeat + note.start_beat`
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- `noteAbsEnd = noteAbsStart + note.duration_beats`
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- Clip: keep if `noteAbsStart < windowEndBeat && noteAbsEnd > windowStartBeat`
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- `clampedDur = Math.min(noteAbsEnd, windowEndBeat) - Math.max(noteAbsStart, windowStartBeat)`
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- Push: `{ id: ghost_${note.id}, pitch, relative_start_beat: noteAbsStart - windowStartBeat, duration_beats: clampedDur, velocity, original_track_name: t.name, original_track_color: t.color || '#888' }`
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5. Group by track → `ghostLayers: [{ track_id, track_name, track_color, notes }]`
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6. Return `ghostLayers`
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### Step 2: Pass `activeTracks` to PianoRollTabEditor
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At render site (~line 16113), add:
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```js
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activeTracks: activeTracks,
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```
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Add `activeTracks` to destructured props in `PianoRollTabEditor` function signature (~line 4563).
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### Step 3: New state & derived data
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Inside `PianoRollTabEditor` (~line 4570), after existing `React.useState` declarations:
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```js
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const [showGhostNotes, setShowGhostNotes] = React.useState(true);
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const [sessionSyncMode, setSessionSyncMode] = React.useState(true);
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// Compute all MIDI items for dropdown
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const allMidiItems = React.useMemo(() => {
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const result = [];
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(activeTracks || []).forEach(t => {
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if (!t.midiItems || !t.midiItems.length) return;
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t.midiItems.forEach(m => {
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result.push({ ...m, _trackId: t.id, _trackName: t.name });
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});
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});
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return result;
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}, [activeTracks]);
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// Compute ghost layers
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const ghostLayers = React.useMemo(() => {
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if (!activeTracks || !st || !st.target_id) return [];
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return extractGhostLayers(activeTracks, st.trackId, st.target_id, parseInt(bpm) || 120);
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}, [activeTracks, st.trackId, st.target_id, bpm]);
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// Compute session offset for bar labels
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const secondsPerBar = (60.0 / (parseInt(bpm) || 120)) * 4;
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const targetTrack = React.useMemo(
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() => (activeTracks || []).find(t => t.id === st.trackId),
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[activeTracks, st.trackId]
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);
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const activeTargetItem = React.useMemo(
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() => targetTrack ? (targetTrack.midiItems || []).find(m => m.id === st.target_id) : null,
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[targetTrack, st.target_id]
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);
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const sessionStartBar = sessionSyncMode && activeTargetItem
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? (activeTargetItem.startTime / secondsPerBar) : 0;
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```
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### Step 4: Dropdown at tab title position
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Replace the static title (line 5748-5752) with a dropdown:
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```js
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/* 1a. TAB TITLE DROPDOWN */
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React.createElement("div", { className: "relative inline-block text-xs" },
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React.createElement("select", {
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value: st.target_id,
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onChange: e => handleSwitchMidiItem(e.target.value),
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className: "bg-zinc-800 border border-zinc-700 text-yellow-500 font-bold rounded px-1.5 py-0.5 outline-none focus:border-yellow-500 max-w-[200px]"
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}, allMidiItems.map(m =>
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React.createElement("option", {
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key: m.id,
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value: m.id
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}, `${m._trackName} - ${m.name || 'MIDI'}`)
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))
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)
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```
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### Step 5: Switch handler function
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Add before the return statement:
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```js
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const handleSwitchMidiItem = (itemId) => {
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if (itemId === st.target_id) return;
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// Save current notes first
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onSaveNotes(st.id, st.trackId, st.target_id, notes);
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// Find selected item
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const match = allMidiItems.find(m => m.id === itemId);
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if (!match) return;
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// Update subTab state (triggers ghost re-compute via useMemo)
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setSubTabs(prev => prev.map(s => s.id === st.id ? {
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...s,
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trackId: match._trackId,
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target_id: match.id,
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label: `Piano Roll: ${match.name || 'MIDI'}`,
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notes: match.notes || [],
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duration: match.duration || 4,
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instrumentProgram: activeTracks.find(t => t.id === match._trackId)?.instrumentProgram,
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instrumentName: activeTracks.find(t => t.id === match._trackId)?.instrumentName,
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note_selection: [],
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currentTime: 0,
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} : s));
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// Reset local state
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setSelectedNoteIds([]);
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setLoopStartBeat(null);
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setLoopEndBeat(null);
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};
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```
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### Step 6: Session sync toggle button
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In toolbar (~line 5798, near CC toggle), add:
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```js
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/* Session sync mode toggle */
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React.createElement("button", {
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onClick: () => setSessionSyncMode(!sessionSyncMode),
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className: `px-2 py-1 rounded text-xs ${sessionSyncMode ? 'bg-cyan-900/60 text-cyan-300 border border-cyan-700' : 'text-zinc-500 hover:text-zinc-300'}`,
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title: sessionSyncMode ? "Session-synced mode (ghost visible)" : "Isolated mode (bar 0, no ghost)"
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}, sessionSyncMode ? "🌐 Session" : "📋 Isolated")
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```
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And the Ghost toggle:
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```js
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React.createElement("button", {
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onClick: () => setShowGhostNotes(!showGhostNotes),
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disabled: !sessionSyncMode,
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className: `px-2 py-1 rounded text-xs ${!sessionSyncMode ? 'opacity-30 cursor-not-allowed' : showGhostNotes ? 'bg-purple-900/60 text-purple-300 border border-purple-700' : 'text-zinc-500 hover:text-zinc-300'}`,
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title: "Toggle ghost notes visibility"
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}, "👻 Ghost")
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```
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Ghost toggle disabled in isolated mode (no ghost notes to show).
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### Step 7: Bar labels with session offset
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Modify `renderBarLabels()` (~line 5711-5734):
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Replace `Bar ${bar}` with:
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```js
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const displayBar = bar + Math.floor(sessionStartBar);
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`Bar ${displayBar}`
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```
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And the seek click handler:
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```js
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const barTime = (bar + Math.floor(sessionStartBar)) * 4 * beatSec;
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```
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### Step 8: Auto-scroll to session position
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Add `useEffect`:
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```js
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React.useEffect(() => {
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if (sessionSyncMode && gridScrollRef.current && activeTargetItem) {
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const scrollTargetBeats = sessionStartBar * 4;
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gridScrollRef.current.scrollLeft = scrollTargetBeats * pixelsPerBeat;
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}
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}, [sessionSyncMode, sessionStartBar, st.target_id, pixelsPerBeat]);
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```
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### Step 9: Ghost note canvas layer
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In the note-drawing `useLayoutEffect` (~line 4834), insert **before** active note rendering:
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```js
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/* Layer 2: Ghost Notes */
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if (showGhostNotes && sessionSyncMode && ghostLayers.length > 0) {
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ghostLayers.forEach(layer => {
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ctx.save();
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ctx.globalAlpha = 0.25;
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ctx.fillStyle = layer.track_color || '#888';
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ctx.strokeStyle = layer.track_color || '#888';
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layer.notes.forEach(note => {
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const x = note.relative_start_beat * pixelsPerBeat;
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const y = (127 - note.pitch) * NoteHeight;
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const w = note.duration_beats * pixelsPerBeat;
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const h = NoteHeight - 1;
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ctx.fillRect(x, y, w, h);
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ctx.setLineDash([2, 2]);
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ctx.lineWidth = 1;
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ctx.strokeRect(x, y, w, h);
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ctx.setLineDash([]);
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});
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ctx.restore();
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});
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}
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```
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Add `showGhostNotes`, `sessionSyncMode`, `ghostLayers` to dependency array.
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### Step 10: Ghost notes in CC Lane
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Skip ghost notes in CC lane (only active notes). CC lane already only iterates `notes`, not `ghostLayers`. No changes needed.
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---
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## Edge Cases
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- **Dropdown with single MIDI item**: Only one option, no ghost notes (nothing to ghost).
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- **Item deleted while piano roll is open**: `handleSwitchMidiItem` fails gracefully (item not found → no-op). `ghostLayers` `useMemo` returns `[]`.
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- **BPM change mid-edit**: All beat computations update via `useMemo`/React reactivity.
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- **Session sync → Isolated switch**: Scroll resets to 0, bar labels change to 0-based, ghost notes disappear.
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- **Isolated → Session sync switch**: Scroll jumps to session position, ghost notes reappear.
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- **Color fallback**: Use track's `color` prop; if `#888` as default.
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---
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## Validation
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1. Open MIDI item → dropdown shows all MIDI items across all tracks
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2. Select different item from dropdown → active notes switch, ghost notes re-compute
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3. Ghost notes from ALL non-selected items appear (same track + other tracks)
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4. Ghost toggle hides/shows ghost notes (disabled in isolated mode)
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5. Session sync mode shows correct bar labels (e.g. `Bar 2` if item starts at bar 2)
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6. Isolated mode shows `Bar 0, 1, 2...` regardless of item's session position
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7. Switching items in isolated mode: notes change, viewport stays at bar 0
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8. Ghost notes cannot be clicked/dragged (excluded from hit-testing)
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9. Muted tracks' MIDI items are excluded from ghost notes
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10. Items outside target window are excluded from ghost notes
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Binary file not shown.
@@ -0,0 +1,259 @@
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# TECHNICAL SPECIFICATION: GHOST NOTES FEATURE IN PIANO ROLL TAB
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This document details the workflow and processing algorithms for opening any `MIDIItem` (for example, MIDI Item 1 spanning Bar 0 to Bar 4) on the main Timeline in a Piano Roll Tab, while extracting and displaying all notes from other tracks occupying the same time interval (Bar 0 - Bar 4) as Ghost Notes (faded reference notes that cannot be interactively edited).
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---
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## 1. DATA FLOW & MODULE ARCHITECTURE DIAGRAM
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```text
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[ USER DBL-CLICK ITEM 1 ]
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(Track A, Bar 0 - 4)
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v
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[ 1. Context Extractor Engine ]
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├── Target Item: Active Editing Item
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├── Window Bounds: [Bar 0.0 -> Bar 4.0]
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└── Scan All Other Tracks (B, C, D...)
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v
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[ 2. Overlap Filtering Algorithm ]
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├── Track B (Bass): Item B1 (Bar 0 - 8) -> Overlap! Slice [Bar 0 -> 4]
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├── Track C (Pads): Item C1 (Bar 2 - 6) -> Overlap! Slice [Bar 2 -> 4]
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└── Track D (Lead): Item D1 (Bar 5 - 8) -> Out of bounds! Ignore
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v
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[ 3. Piano Roll State Store ]
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├── activeItem: MIDI Item 1 (Full Edit Access)
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└── ghostLayers: [ Track B Notes, Track C Notes ] (Read-Only)
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v
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[ 4. Multi-Layer Canvas Renderer ]
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├── Layer 1: Background Grid & Pitch Keys
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├── Layer 2: Ghost Notes (Opacity 25%, Muted Color, Pointer Events OFF)
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└── Layer 3: Active Notes (Full Opacity, Drag/Drop/Resize Allowed)
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```
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---
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## 2. TIME-WINDOW OVERLAP FILTERING ALGORITHM
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To determine whether a `MIDIItem` on another track overlaps with the interval $[start\_bar, end\_bar]$ of MIDI Item 1, a 1D geometric condition is applied:
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### Overlap Condition
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Two time intervals $[A_{start}, A_{end}]$ and $[B_{start}, B_{end}]$ intersect if and only if:
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$$B_{start} < A_{end} \quad \text{AND} \quad B_{end} > A_{start}$$
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Where:
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* $A_{start} = \text{Item1.start\_bar} = 0.0$
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* $A_{end} = \text{Item1.start\_bar} + \text{Item1.duration\_bars} = 4.0$
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```javascript
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// app/static/js/services/ghostNoteExtractor.js
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/**
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* Extracts a list of Ghost Notes from other tracks within the specified Bar window
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* @param {Object} sessionState - Full Main Session state object
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* @param {string} targetTrackId - ID of the currently active editing Track (Track A)
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* @param {number} windowStartBar - Start bar position of the active Item (e.g., 0.0)
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* @param {number} windowDurationBars - Bar duration of the active Item (e.g., 4.0)
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* @returns {Array} List of normalized Ghost Layers
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*/
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export function extractGhostLayers(sessionState, targetTrackId, windowStartBar, windowDurationBars) {
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const windowEndBar = windowStartBar + windowDurationBars;
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const timeSigNumerator = sessionState.metadata.time_signature_numerator || 4;
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const ghostLayers = [];
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// Iterate over all tracks in Main Session
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sessionState.main_session.tracks.forEach((track) => {
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// Ignore active editing track and non-MIDI or muted tracks
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if (track.id === targetTrackId || track.type !== "MIDI" || track.mute) {
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return;
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}
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const trackGhostNotes = [];
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// Iterate over all items in target candidate tracks
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track.items.forEach((item) => {
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if (item.type !== "MIDI_ITEM") return;
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const itemStartBar = item.start_bar;
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const itemEndBar = item.start_bar + item.duration_bars;
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// Evaluate Overlap Condition
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if (itemStartBar < windowEndBar && itemEndBar > windowStartBar) {
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const itemOffsetBar = item.clip_start_offset_bars || 0.0;
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item.source_data.notes.forEach((note) => {
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// Convert internal note start_beat to absolute timeline beats
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const noteAbsoluteBeat = (itemStartBar * timeSigNumerator) + note.start_beat - (itemOffsetBar * timeSigNumerator);
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const noteEndAbsoluteBeat = noteAbsoluteBeat + note.duration_beats;
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const windowStartBeat = windowStartBar * timeSigNumerator;
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const windowEndBeat = windowEndBar * timeSigNumerator;
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// Retain notes truly within the visible bounds [windowStartBeat -> windowEndBeat]
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if (noteAbsoluteBeat < windowEndBeat && noteEndAbsoluteBeat > windowStartBeat) {
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trackGhostNotes.push({
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id: `ghost_${note.id}`,
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pitch: note.pitch,
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// Convert beat position to relative coordinates of the Piano Roll Window (0 -> duration_beats)
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relative_start_beat: noteAbsoluteBeat - windowStartBeat,
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duration_beats: note.duration_beats,
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velocity: note.velocity,
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original_track_name: track.name,
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original_track_color: track.color || "#888888"
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});
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}
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});
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}
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});
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if (trackGhostNotes.length > 0) {
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ghostLayers.push({
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track_id: track.id,
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track_name: track.name,
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track_color: track.color || "#6b7280",
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notes: trackGhostNotes
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});
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}
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});
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return ghostLayers;
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}
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```
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---
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## 3. STATE STRUCTURE FOR PIANO ROLL TAB
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When the user opens MIDI Item 1, the Tab Controller generates an isolated context payload for the Piano Roll:
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```javascript
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// Data Payload passed into the PianoRollTab Component
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const pianoRollTabContext = {
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tab_id: "tab_pianoroll_item_1",
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title: "Piano Roll - MIDI Item 1",
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type: "PIANO_ROLL_TAB",
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parent_tab_id: "tab_main_session",
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// 1. Target Item open for direct interactive editing
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active_context: {
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track_id: "track_A",
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item_id: "item_1",
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item_name: "MIDI Item 1",
|
||||
start_bar: 0.0,
|
||||
duration_bars: 4.0,
|
||||
notes: [/* Original source MIDI notes of Item 1 */]
|
||||
},
|
||||
|
||||
// 2. Read-only Ghost Layers displayed as background reference indicators
|
||||
ghost_layers: [
|
||||
{
|
||||
track_id: "track_B_bass",
|
||||
track_name: "Track B (Bass)",
|
||||
track_color: "#3b82f6", // Green / Blue
|
||||
notes: [
|
||||
{ pitch: 36, relative_start_beat: 0.0, duration_beats: 4.0, velocity: 0.9 },
|
||||
{ relative_start_beat: 4.0, pitch: 38, duration_beats: 4.0, velocity: 0.8 }
|
||||
]
|
||||
},
|
||||
{
|
||||
track_id: "track_C_pads",
|
||||
track_name: "Track C (Pads)",
|
||||
track_color: "#ec4899", // Pink
|
||||
notes: [
|
||||
{ pitch: 60, relative_start_beat: 8.0, duration_beats: 8.0, velocity: 0.6 }
|
||||
]
|
||||
}
|
||||
]
|
||||
};
|
||||
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 4. MULTI-LAYER CANVAS RENDERER WORKFLOW
|
||||
|
||||
Inside the Piano Roll canvas rendering module, elements are drawn sequentially by z-index order to position Ghost Notes behind Active Notes:
|
||||
|
||||
```javascript
|
||||
// app/static/js/views/pianoRollRenderer.js
|
||||
|
||||
export function renderPianoRollCanvas(ctx, canvasWidth, canvasHeight, viewState, activeItem, ghostLayers) {
|
||||
const { zoomX, zoomY, scrollX, scrollY, noteHeight } = viewState;
|
||||
|
||||
// -----------------------------------------------------------------
|
||||
// LAYER 1: BACKGROUND & GRID LINES
|
||||
// -----------------------------------------------------------------
|
||||
drawPianoGrid(ctx, canvasWidth, canvasHeight, viewState);
|
||||
|
||||
// -----------------------------------------------------------------
|
||||
// LAYER 2: GHOST NOTES (BACKGROUND REFERENCE FROM OTHER TRACKS)
|
||||
// -----------------------------------------------------------------
|
||||
if (ghostLayers && ghostLayers.length > 0) {
|
||||
ghostLayers.forEach((layer) => {
|
||||
ctx.save();
|
||||
// Set faded opacity (20% - 30% opacity)
|
||||
ctx.globalAlpha = 0.25;
|
||||
ctx.fillStyle = layer.track_color;
|
||||
ctx.strokeStyle = layer.track_color;
|
||||
|
||||
layer.notes.forEach((note) => {
|
||||
const x = (note.relative_start_beat - scrollX) * zoomX;
|
||||
const y = (127 - note.pitch - scrollY) * noteHeight;
|
||||
const w = note.duration_beats * zoomX;
|
||||
const h = noteHeight - 1; // 1px border gap
|
||||
|
||||
// Draw Ghost note body (Dashed border or light stroke)
|
||||
ctx.fillRect(x, y, w, h);
|
||||
ctx.setLineDash([2, 2]); // Dashed lines indicating non-interactive status
|
||||
ctx.lineWidth = 1;
|
||||
ctx.strokeRect(x, y, w, h);
|
||||
});
|
||||
|
||||
ctx.restore();
|
||||
});
|
||||
}
|
||||
|
||||
// -----------------------------------------------------------------
|
||||
// LAYER 3: ACTIVE NOTES (EDITABLE NOTES FOR ITEM 1)
|
||||
// -----------------------------------------------------------------
|
||||
activeItem.notes.forEach((note) => {
|
||||
ctx.save();
|
||||
ctx.globalAlpha = 1.0; // 100% full opacity
|
||||
|
||||
const x = (note.start_beat - scrollX) * zoomX;
|
||||
const y = (127 - note.pitch - scrollY) * noteHeight;
|
||||
const w = note.duration_beats * zoomX;
|
||||
const h = noteHeight - 1;
|
||||
|
||||
// Bright fill colors for active notes
|
||||
ctx.fillStyle = note.selected ? "#f59e0b" : "#10b981"; // Orange if selected, green if default
|
||||
ctx.fillRect(x, y, w, h);
|
||||
|
||||
ctx.strokeStyle = "#ffffff";
|
||||
ctx.lineWidth = 1;
|
||||
ctx.strokeRect(x, y, w, h);
|
||||
|
||||
ctx.restore();
|
||||
});
|
||||
}
|
||||
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 5. POINTER INTERACTION RULES
|
||||
|
||||
To prevent accidental modification or drag interactions with Ghost Notes:
|
||||
|
||||
* **Hit-Testing Isolation:** On pointer events (`mousedown`, `mousemove`, or marquee selection), the Hit-Test algorithm queries `activeItem.notes` exclusively. `ghostLayers` items are omitted from event evaluation.
|
||||
* **Toggle Ghost Notes Visibility:** The Piano Roll toolbar includes an Eye / Ghost icon button (`[👻 Ghost Notes]`) allowing operators to toggle the visibility of the reference background layer.
|
||||
* **Live Synchronous Updates:** Modifying a note on Track B within the Main Session or an adjacent tab dispatches an `EVENT_SESSION_UPDATED` Event Bus signal. The active Piano Roll Tab receives this event and invokes `extractGhostLayers()` to dynamically redraw updated Ghost Note positions.
|
||||
Reference in New Issue
Block a user