From a78c346371486d12245658df31ca431b85c4280c Mon Sep 17 00:00:00 2001
From: josc146 <josStorer@outlook.com>
Date: Thu, 30 Nov 2023 11:55:10 +0800
Subject: [PATCH] fix NoteOff ElapsedTime of MIDI Tracks

---
 backend-golang/midi.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/backend-golang/midi.go b/backend-golang/midi.go
index b4d518f..32341c3 100644
--- a/backend-golang/midi.go
+++ b/backend-golang/midi.go
@@ -86,6 +86,12 @@ func (a *App) OpenMidiPort(index int) error {
 		channel := bytes[0] & 0x0f
 		switch msgType {
 		case 0x8:
+			elapsed := time.Since(lastNoteTime)
+			lastNoteTime = time.Now()
+			runtime.EventsEmit(a.ctx, "midiMessage", &MIDIMessage{
+				MessageType: "ElapsedTime",
+				Value:       int(elapsed.Milliseconds()),
+			})
 			note := bytes[1]
 			runtime.EventsEmit(a.ctx, "midiMessage", &MIDIMessage{
 				MessageType: "NoteOff",