feat(piano-roll): ghost notes + dropdown item switcher + session sync

- MIDI ghost notes: all non-selected items rendered at 25% opacity - Dropdown at tab title: switch active edit target across all tracks - Session Sync mode (default): viewport aligned to session bars - Isolated mode toggle: bar 0, no ghost notes - Ghost toggle: show/hide ghost layer (only in session mode) - Auto-scroll to session position in session sync mode - Bar labels show absolute session bar numbers
2026-07-27 17:08:59 +07:00
parent c4a320a1c1
commit 035d75e504
5 changed files with 213 additions and 18 deletions
@@ -0,0 +1,75 @@
+// SonicForge Studio Ghost Note Extractor Service
+(function() {
+  function extractGhostLayers(activeTracks, targetTrackId, targetItemId, bpm) {
+    if (!activeTracks || !targetItemId) return [];
+
+    const secondsPerBeat = 60.0 / (parseInt(bpm) || 120);
+
+    let targetItem = null;
+    for (var i = 0; i < activeTracks.length; i++) {
+      var t = activeTracks[i];
+      var found = (t.midiItems || []).find(function(m) { return m.id === targetItemId; });
+      if (found) { targetItem = found; break; }
+    }
+    if (!targetItem) return [];
+
+    const windowStartBeat = targetItem.startTime / secondsPerBeat;
+    const windowEndBeat = (targetItem.startTime + targetItem.duration) / secondsPerBeat;
+
+    const ghostLayers = [];
+
+    for (var i = 0; i < activeTracks.length; i++) {
+      var track = activeTracks[i];
+      if (!track.midiItems || !track.midiItems.length) continue;
+      if (track.muted) continue;
+
+      var trackGhostNotes = [];
+
+      for (var j = 0; j < track.midiItems.length; j++) {
+        var item = track.midiItems[j];
+        if (item.id === targetItemId) continue;
+
+        var itemStartBeat = item.startTime / secondsPerBeat;
+        var itemEndBeat = (item.startTime + item.duration) / secondsPerBeat;
+
+        if (itemStartBeat >= windowEndBeat || itemEndBeat <= windowStartBeat) continue;
+
+        var notes = item.notes || [];
+        for (var k = 0; k < notes.length; k++) {
+          var note = notes[k];
+          var noteAbsStart = itemStartBeat + (note.start_beat || 0);
+          var noteAbsEnd = noteAbsStart + (note.duration_beats || 1);
+
+          if (noteAbsStart >= windowEndBeat || noteAbsEnd <= windowStartBeat) continue;
+
+          var clampedStart = Math.max(noteAbsStart, windowStartBeat);
+          var clampedEnd = Math.min(noteAbsEnd, windowEndBeat);
+          var clampedDur = clampedEnd - clampedStart;
+
+          trackGhostNotes.push({
+            id: 'ghost_' + (note.id || Math.random().toString(36).substr(2, 9)),
+            pitch: note.pitch,
+            relative_start_beat: clampedStart - windowStartBeat,
+            duration_beats: clampedDur,
+            velocity: note.velocity,
+            original_track_name: track.name,
+            original_track_color: track.color || '#888888'
+          });
+        }
+      }
+
+      if (trackGhostNotes.length > 0) {
+        ghostLayers.push({
+          track_id: track.id,
+          track_name: track.name,
+          track_color: track.color || '#6b7280',
+          notes: trackGhostNotes
+        });
+      }
+    }
+
+    return ghostLayers;
+  }
+
+  window.SonicGhost = { extractGhostLayers: extractGhostLayers };
+})();