From 05ef86e00ce120dabf297e7c8003eae8fad1b85e Mon Sep 17 00:00:00 2001
From: Xavier Godart <xavier.godart64@gmail.com>
Date: Fri, 9 Aug 2024 09:52:21 +0200
Subject: [PATCH] prevent note preview while playing

---
 sequencer/pattern.go   | 1 +
 sequencer/sequencer.go | 1 +
 sequencer/step.go      | 3 +++
 sequencer/track.go     | 7 ++++++-
 4 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/sequencer/pattern.go b/sequencer/pattern.go
index f3eb3d9..04c27a7 100644
--- a/sequencer/pattern.go
+++ b/sequencer/pattern.go
@@ -123,6 +123,7 @@ func (s *sequencer) Load(pattern int) {
 
 		s.tracks = append(s.tracks, &track{
 			midi:                  s.midi,
+			seq:                   s,
 			steps:                 []*step{},
 			chord:                 t.Chord,
 			length:                t.Length,
diff --git a/sequencer/sequencer.go b/sequencer/sequencer.go
index 1a2d515..259b7ba 100644
--- a/sequencer/sequencer.go
+++ b/sequencer/sequencer.go
@@ -126,6 +126,7 @@ func (s *sequencer) AddTrack() {
 	channel := len(s.tracks)
 	track := &track{
 		midi:                  s.midi,
+		seq:                   s,
 		pulse:                 pulse,
 		chord:                 []uint8{defaultNote},
 		length:                pulsesPerStep,
diff --git a/sequencer/step.go b/sequencer/step.go
index 4f90a73..f8d60c2 100644
--- a/sequencer/step.go
+++ b/sequencer/step.go
@@ -182,6 +182,9 @@ func (s *step) SetChord(chord []uint8) {
 		if note < minChordNote || note > maxChordNote {
 			return
 		}
+		if s.track.seq.isPlaying {
+			continue
+		}
 		go func(note uint8) {
 			s.midi.NoteOn(s.track.device, s.track.channel, note, s.Velocity())
 			time.Sleep(time.Second)
diff --git a/sequencer/track.go b/sequencer/track.go
index 98cfab6..e4e6c53 100644
--- a/sequencer/track.go
+++ b/sequencer/track.go
@@ -24,7 +24,9 @@ type Track interface {
 }
 
 type track struct {
-	midi  midi.Midi
+	midi midi.Midi
+	seq  *sequencer
+
 	steps []*step
 
 	// The pulse defines the current position of the playhead in the track.
@@ -214,6 +216,9 @@ func (t *track) SetChord(chord []uint8) {
 		if note < minChordNote || note > maxChordNote {
 			return
 		}
+		if t.seq.isPlaying {
+			continue
+		}
 		go func(note uint8) {
 			t.midi.NoteOn(t.device, t.channel, note, t.Velocity())
 			time.Sleep(time.Second)