feat(tracker): add ability to copy, cut and paste units

tracker/gioui/instrumenteditor.go

@@ -462,7 +462,7 @@ func (ie *InstrumentEditor) layoutInstrumentEditor(gtx C, t *Tracker) D {
 				return layout.Stack{Alignment: layout.SE}.Layout(gtx,
 					layout.Expanded(func(gtx C) D {
 						defer clip.Rect(image.Rect(0, 0, gtx.Constraints.Max.X, gtx.Constraints.Max.Y)).Push(gtx.Ops).Pop()
-						key.InputOp{Tag: ie.unitDragList, Keys: "→|⏎|⌫|⌦|⎋|Ctrl-⏎"}.Add(gtx.Ops)
+						key.InputOp{Tag: ie.unitDragList, Keys: "→|⏎|⌫|⌦|⎋|Ctrl-⏎|Ctrl-C|Ctrl-X"}.Add(gtx.Ops)
 						for _, event := range gtx.Events(ie.unitDragList) {
 							switch e := event.(type) {
 							case key.Event:
@@ -480,6 +480,19 @@ func (ie *InstrumentEditor) layoutInstrumentEditor(gtx C, t *Tracker) D {
 										ie.unitTypeEditor.SetCaret(l, l)
 									case key.NameDeleteForward:
 										t.DeleteUnit(true)
+									case "C":
+										contents, err := yaml.Marshal(t.Unit())
+										if err == nil {
+											clipboard.WriteOp{Text: string(contents)}.Add(gtx.Ops)
+											t.Alert.Update("Unit copied to clipboard", Notify, time.Second*3)
+										}
+									case "X":
+										contents, err := yaml.Marshal(t.Unit())
+										if err == nil {
+											clipboard.WriteOp{Text: string(contents)}.Add(gtx.Ops)
+											t.Alert.Update("Unit cut to clipboard", Notify, time.Second*3)
+										}
+										t.DeleteUnit(true)
 									case key.NameReturn:
 										if e.Modifiers.Contain(key.ModShortcut) {
 											t.AddUnit(true)

tracker/gioui/parameditor.go

@@ -4,7 +4,9 @@ import (
 	"image"
 	"image/color"
 	"strings"
+	"time"
 
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/layout"
@@ -15,6 +17,7 @@ import (
 	"gioui.org/widget"
 	"github.com/vsariola/sointu/tracker"
 	"golang.org/x/exp/shiny/materialdesign/icons"
+	"gopkg.in/yaml.v3"
 )
 
 type ParamEditor struct {
@@ -22,6 +25,7 @@ type ParamEditor struct {
 	scrollBar          *ScrollBar
 	Parameters         []*ParameterWidget
 	DeleteUnitBtn      *widget.Clickable
+	CopyUnitBtn        *widget.Clickable
 	ClearUnitBtn       *widget.Clickable
 	ChooseUnitTypeBtns []*widget.Clickable
 	tag                bool
@@ -41,6 +45,7 @@ func NewParamEditor() *ParamEditor {
 	ret := &ParamEditor{
 		DeleteUnitBtn: new(widget.Clickable),
 		ClearUnitBtn:  new(widget.Clickable),
+		CopyUnitBtn:   new(widget.Clickable),
 		list:          &layout.List{Axis: layout.Vertical},
 		scrollBar:     &ScrollBar{Axis: layout.Vertical},
 	}
@@ -178,6 +183,15 @@ func (pe *ParamEditor) layoutUnitFooter(t *Tracker) layout.Widget {
 			op.InvalidateOp{}.Add(gtx.Ops)
 			t.InstrumentEditor.unitDragList.Focus()
 		}
+		for pe.CopyUnitBtn.Clicked() {
+			op.InvalidateOp{}.Add(gtx.Ops)
+			contents, err := yaml.Marshal(t.Unit())
+			if err == nil {
+				clipboard.WriteOp{Text: string(contents)}.Add(gtx.Ops)
+				t.Alert.Update("Unit copied to clipboard", Notify, time.Second*3)
+			}
+		}
+		copyUnitBtnStyle := IconButton(t.Theme, pe.CopyUnitBtn, icons.ContentContentCopy, true)
 		deleteUnitBtnStyle := IconButton(t.Theme, pe.DeleteUnitBtn, icons.ActionDelete, t.CanDeleteUnit())
 		text := t.Unit().Type
 		if text == "" {
@@ -188,6 +202,7 @@ func (pe *ParamEditor) layoutUnitFooter(t *Tracker) layout.Widget {
 		hintText := Label(text, white)
 		return layout.Flex{Axis: layout.Horizontal, Alignment: layout.Middle}.Layout(gtx,
 			layout.Rigid(deleteUnitBtnStyle.Layout),
+			layout.Rigid(copyUnitBtnStyle.Layout),
 			layout.Rigid(func(gtx C) D {
 				var dims D
 				if t.Unit().Type != "" {

tracker/gioui/tracker.go

@@ -67,6 +67,15 @@ type Tracker struct {
 }
 
 func (t *Tracker) UnmarshalContent(bytes []byte) error {
+	var unit sointu.Unit
+	if errJSON := json.Unmarshal(bytes, &unit); errJSON == nil {
+		t.PasteUnit(unit)
+		return nil
+	}
+	if errYaml := yaml.Unmarshal(bytes, &unit); errYaml == nil {
+		t.PasteUnit(unit)
+		return nil
+	}
 	var instr sointu.Instrument
 	if errJSON := json.Unmarshal(bytes, &instr); errJSON == nil {
 		if t.SetInstrument(instr) {

tracker/model.go

@@ -641,6 +641,24 @@ func (m *Model) SetUnitType(t string) {
 	m.notifyPatchChange()
 }
 
+func (m *Model) PasteUnit(unit sointu.Unit) {
+	m.saveUndo("PasteUnit", 0)
+	newUnits := make([]sointu.Unit, len(m.Instrument().Units)+1)
+	m.unitIndex++
+	copy(newUnits, m.Instrument().Units[:m.unitIndex])
+	copy(newUnits[m.unitIndex+1:], m.Instrument().Units[m.unitIndex:])
+	if _, ok := m.usedIDs[unit.ID]; ok {
+		m.maxID++
+		unit.ID = m.maxID
+	}
+	m.usedIDs[unit.ID] = true
+	newUnits[m.unitIndex] = unit
+	m.song.Patch[m.instrIndex].Units = newUnits
+	m.paramIndex = 0
+	m.clampPositions()
+	m.notifyPatchChange()
+}
+
 func (m *Model) SetUnitIndex(value int) {
 	m.unitIndex = value
 	m.paramIndex = 0