feat: implement md/41_INSTRUMENT.md spec

- PianoRollTabService: getParentTrackByItemId, buildActiveScope, getTrackMidiChannel helpers - parent_track_id on all MIDI items for reverse track lookup - handleSwitchMidiItem uses active_scope pattern - Toolbar shows parent track context labels - Channel assignment simplified to trackIndex % 16 - All playNote calls use unified getTrackMidiChannel
2026-07-27 20:48:14 +07:00
parent 40502eda86
commit b42190e6bc
5 changed files with 96 additions and 72 deletions
@@ -0,0 +1,43 @@
+(function () {
+    'use strict';
+    window.SonicPianoRoll = {
+        getParentTrackByItemId: function (itemId, tracks) {
+            if (!tracks || !itemId) return null;
+            for (var i = 0; i < tracks.length; i++) {
+                var items = tracks[i].midiItems || [];
+                for (var j = 0; j < items.length; j++) {
+                    if (items[j].id === itemId) return tracks[i];
+                }
+            }
+            return null;
+        },
+        getParentTrackIdByItemId: function (itemId, tracks) {
+            var trk = this.getParentTrackByItemId(itemId, tracks);
+            return trk ? trk.id : null;
+        },
+        buildActiveScope: function (itemId, tracks) {
+            var parentTrack = this.getParentTrackByItemId(itemId, tracks);
+            if (!parentTrack) return null;
+            var trackIndex = -1;
+            for (var i = 0; i < tracks.length; i++) {
+                if (tracks[i].id === parentTrack.id) { trackIndex = i; break; }
+            }
+            return {
+                item_id: itemId,
+                parent_track_id: parentTrack.id,
+                midi_channel: trackIndex >= 0 ? trackIndex % 16 : 0,
+                current_synth_engine: parentTrack.synth_engine || null,
+                instrument_program: parentTrack.instrumentProgram,
+                instrument_name: parentTrack.instrumentName
+            };
+        },
+        getTrackMidiChannel: function (track, tracks) {
+            if (track && track.midiChannel !== undefined) return track.midiChannel;
+            if (!track || !tracks) return 0;
+            for (var i = 0; i < tracks.length; i++) {
+                if (tracks[i].id === track.id) return i % 16;
+            }
+            return 0;
+        }
+    };
+})();