From d01657ab830eeacb32a8817b29872b7ef8028aab Mon Sep 17 00:00:00 2001
From: vsariola <5684185+vsariola@users.noreply.github.com>
Date: Fri, 12 Feb 2021 08:43:27 +0200
Subject: [PATCH] feat(tracker): add numeric up down to adjust number of voices
 per track

---
 tracker/track.go   | 18 +++++++++++++++++-
 tracker/tracker.go | 21 +++++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/tracker/track.go b/tracker/track.go
index b5c2c2d..f004301 100644
--- a/tracker/track.go
+++ b/tracker/track.go
@@ -104,7 +104,19 @@ func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
 			gtx.Constraints.Min.X = gtx.Px(unit.Dp(70))
 			return in.Layout(gtx, numStyle.Layout)
 		}
-		return layout.Flex{Axis: layout.Horizontal, Alignment: layout.Middle}.Layout(gtx,
+		n := t.song.Tracks[t.Cursor.Track].NumVoices
+		maxRemain := t.song.Patch.TotalVoices() - t.song.TotalTrackVoices() + n
+		if maxRemain < 1 {
+			maxRemain = 1
+		}
+		t.TrackVoices.Value = n
+		voiceUpDown := func(gtx C) D {
+			numStyle := NumericUpDown(t.Theme, t.TrackVoices, 1, maxRemain)
+			gtx.Constraints.Min.Y = gtx.Px(unit.Dp(20))
+			gtx.Constraints.Min.X = gtx.Px(unit.Dp(70))
+			return in.Layout(gtx, numStyle.Layout)
+		}
+		dims := layout.Flex{Axis: layout.Horizontal, Alignment: layout.Middle}.Layout(gtx,
 			layout.Rigid(Label("OCT:", white)),
 			layout.Rigid(octave),
 			layout.Rigid(Label(" PITCH:", white)),
@@ -112,8 +124,12 @@ func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
 			layout.Rigid(subtractSemitoneBtnStyle.Layout),
 			layout.Rigid(addOctaveBtnStyle.Layout),
 			layout.Rigid(subtractOctaveBtnStyle.Layout),
+			layout.Rigid(Label("Voices:", white)),
+			layout.Rigid(voiceUpDown),
 			layout.Flexed(1, func(gtx C) D { return layout.Dimensions{Size: gtx.Constraints.Min} }),
 			layout.Rigid(newTrackBtnStyle.Layout))
+		t.SetTrackVoices(t.TrackVoices.Value)
+		return dims
 	}
 
 	return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
diff --git a/tracker/tracker.go b/tracker/tracker.go
index 92cfd1d..1d3ec58 100644
--- a/tracker/tracker.go
+++ b/tracker/tracker.go
@@ -47,6 +47,7 @@ type Tracker struct {
 	RowsPerPattern        *NumberInput
 	RowsPerBeat           *NumberInput
 	InstrumentVoices      *NumberInput
+	TrackVoices           *NumberInput
 	InstrumentNameEditor  *widget.Editor
 	NewTrackBtn           *widget.Clickable
 	NewInstrumentBtn      *widget.Clickable
@@ -220,6 +221,25 @@ func (t *Tracker) AddTrack() {
 	}
 }
 
+func (t *Tracker) SetTrackVoices(value int) bool {
+	if value < 1 {
+		value = 1
+	}
+	maxRemain := t.song.Patch.TotalVoices() - t.song.TotalTrackVoices() + t.song.Tracks[t.Cursor.Track].NumVoices
+	if maxRemain < 1 {
+		maxRemain = 1
+	}
+	if value > maxRemain {
+		value = maxRemain
+	}
+	if value != int(t.song.Tracks[t.Cursor.Track].NumVoices) {
+		t.SaveUndo()
+		t.song.Tracks[t.Cursor.Track].NumVoices = value
+		return true
+	}
+	return false
+}
+
 func (t *Tracker) AddInstrument() {
 	if t.song.Patch.TotalVoices() >= 32 {
 		return
@@ -519,6 +539,7 @@ func New(audioContext sointu.AudioContext, synthService sointu.SynthService) *Tr
 		RowsPerPattern:        new(NumberInput),
 		RowsPerBeat:           new(NumberInput),
 		InstrumentVoices:      new(NumberInput),
+		TrackVoices:           new(NumberInput),
 		InstrumentNameEditor:  &widget.Editor{SingleLine: true, Submit: true, Alignment: text.Middle},
 		NewTrackBtn:           new(widget.Clickable),
 		NewInstrumentBtn:      new(widget.Clickable),