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feat(tracker): implement simple undo / redo

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vsariola
2021-01-08 22:00:15 +02:00
parent b1df5bb4d5
commit eb25ddd864
3 changed files with 81 additions and 11 deletions
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22
tracker/tracker.go
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@ -44,6 +44,8 @@ type Tracker struct {
synth sointu.Synth
playBuffer []float32
closer chan struct{}
undoStack []sointu.Song
redoStack []sointu.Song
}
func (t *Tracker) LoadSong(song sointu.Song) error {
@ -59,6 +61,21 @@ func (t *Tracker) LoadSong(song sointu.Song) error {
} else {
t.synth = synth
}
if t.DisplayPattern >= song.SequenceLength() {
t.DisplayPattern = song.SequenceLength() - 1
}
if t.CursorRow >= song.PatternRows() {
t.CursorRow = song.PatternRows() - 1
}
if t.PlayPattern >= song.SequenceLength() {
t.PlayPattern = song.SequenceLength() - 1
}
if t.PlayRow >= song.PatternRows() {
t.PlayRow = song.PatternRows() - 1
}
if t.ActiveTrack >= len(song.Tracks) {
t.ActiveTrack = len(song.Tracks) - 1
}
return nil
}
@ -153,6 +170,7 @@ func (t *Tracker) ChangeOctave(delta int) bool {
}
func (t *Tracker) ChangeBPM(delta int) bool {
t.SaveUndo()
newBPM := t.song.BPM + delta
if newBPM < 1 {
newBPM = 1
@ -169,6 +187,7 @@ func (t *Tracker) ChangeBPM(delta int) bool {
}
func (t *Tracker) AddTrack() {
t.SaveUndo()
if t.song.TotalTrackVoices() < t.song.Patch.TotalVoices() {
seq := make([]byte, t.song.SequenceLength())
patterns := [][]byte{make([]byte, t.song.PatternRows())}
@ -181,6 +200,7 @@ func (t *Tracker) AddTrack() {
}
func (t *Tracker) AddInstrument() {
t.SaveUndo()
if t.song.Patch.TotalVoices() < 32 {
units := make([]sointu.Unit, len(defaultInstrument.Units))
for i, defUnit := range defaultInstrument.Units {
@ -220,6 +240,8 @@ func New(audioContext sointu.AudioContext) *Tracker {
patternJump: make(chan int),
ticked: make(chan struct{}),
closer: make(chan struct{}),
undoStack: []sointu.Song{},
redoStack: []sointu.Song{},
}
t.Theme.Color.Primary = color.RGBA{R: 64, G: 64, B: 64, A: 255}
go t.sequencerLoop(t.closer)