feat(gioui): add buttons to save and load instrument

tracker/gioui/files.go

@@ -84,6 +84,46 @@ func (t *Tracker) saveSong(filename string) bool {
 	return true
 }
 
+func (t *Tracker) SaveInstrument() bool {
+	filename, err := dialog.File().Filter("Sointu YAML instrument", "yml").Filter("Sointu JSON song", "json").Title(fmt.Sprintf("Save instrument %v", t.Instrument().Name)).Save()
+	if err != nil {
+		return false
+	}
+	var extension = filepath.Ext(filename)
+	var contents []byte
+	if extension == "json" {
+		contents, err = json.Marshal(t.Instrument())
+	} else {
+		contents, err = yaml.Marshal(t.Instrument())
+	}
+	if err != nil {
+		return false
+	}
+	if extension == "" {
+		filename = filename + ".yml"
+	}
+	ioutil.WriteFile(filename, contents, 0644)
+	return true
+}
+
+func (t *Tracker) LoadInstrument() {
+	filename, err := dialog.File().Filter("Sointu YAML instrument", "yml").Filter("Sointu JSON instrument", "json").Title("Load instrument").Load()
+	if err != nil {
+		return
+	}
+	bytes, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return
+	}
+	var instrument sointu.Instrument
+	if errJSON := json.Unmarshal(bytes, &instrument); errJSON != nil {
+		if errYaml := yaml.Unmarshal(bytes, &instrument); errYaml != nil {
+			return
+		}
+	}
+	t.SetInstrument(instrument)
+}
+
 func (t *Tracker) exportWav(pcm16 bool) {
 	filename, err := dialog.File().Filter(".wav file", "wav").Title("Export .wav").Save()
 	if err != nil {

tracker/gioui/instruments.go

@@ -77,6 +77,16 @@ func (t *Tracker) layoutInstrumentHeader(gtx C) D {
 		copyInstrumentBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
 		copyInstrumentBtnStyle.Color = primaryColor
 
+		saveInstrumentBtnStyle := material.IconButton(t.Theme, t.SaveInstrumentBtn, widgetForIcon(icons.ContentSave))
+		saveInstrumentBtnStyle.Background = transparent
+		saveInstrumentBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
+		saveInstrumentBtnStyle.Color = primaryColor
+
+		loadInstrumentBtnStyle := material.IconButton(t.Theme, t.LoadInstrumentBtn, widgetForIcon(icons.FileFolderOpen))
+		loadInstrumentBtnStyle.Background = transparent
+		loadInstrumentBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
+		loadInstrumentBtnStyle.Color = primaryColor
+
 		deleteInstrumentBtnStyle := material.IconButton(t.Theme, t.DeleteInstrumentBtn, widgetForIcon(icons.ActionDelete))
 		deleteInstrumentBtnStyle.Background = transparent
 		deleteInstrumentBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
@@ -99,6 +109,8 @@ func (t *Tracker) layoutInstrumentHeader(gtx C) D {
 				return dims
 			}),
 			layout.Flexed(1, func(gtx C) D { return layout.Dimensions{Size: gtx.Constraints.Min} }),
+			layout.Rigid(saveInstrumentBtnStyle.Layout),
+			layout.Rigid(loadInstrumentBtnStyle.Layout),
 			layout.Rigid(copyInstrumentBtnStyle.Layout),
 			layout.Rigid(deleteInstrumentBtnStyle.Layout))
 	}
@@ -119,6 +131,13 @@ func (t *Tracker) layoutInstrumentHeader(gtx C) D {
 	for t.ConfirmInstrDelete.BtnCancel.Clicked() {
 		t.ConfirmInstrDelete.Visible = false
 	}
+	for t.SaveInstrumentBtn.Clicked() {
+		t.SaveInstrument()
+	}
+
+	for t.LoadInstrumentBtn.Clicked() {
+		t.LoadInstrument()
+	}
 	return Surface{Gray: 37, Focus: t.EditMode() == tracker.EditUnits || t.EditMode() == tracker.EditParameters}.Layout(gtx, header)
 }
 

tracker/gioui/tracker.go

@@ -46,6 +46,8 @@ type Tracker struct {
 	SongLength            *NumberInput
 	PanicBtn              *widget.Clickable
 	CopyInstrumentBtn     *widget.Clickable
+	SaveInstrumentBtn     *widget.Clickable
+	LoadInstrumentBtn     *widget.Clickable
 	ParameterList         *layout.List
 	ParameterScrollBar    *ScrollBar
 	Parameters            []*ParameterWidget
@@ -145,6 +147,8 @@ func New(audioContext sointu.AudioContext, synthService sointu.SynthService, syn
 		ClearUnitBtn:          new(widget.Clickable),
 		PanicBtn:              new(widget.Clickable),
 		CopyInstrumentBtn:     new(widget.Clickable),
+		SaveInstrumentBtn:     new(widget.Clickable),
+		LoadInstrumentBtn:     new(widget.Clickable),
 		TrackHexCheckBox:      new(widget.Bool),
 		Menus:                 make([]Menu, 2),
 		MenuBar:               make([]widget.Clickable, 2),