feat(tracker): allow copying and pasting songs to/from the window

tracker/keyevent.go

@@ -4,7 +4,9 @@ import (
 	"strconv"
 	"strings"
 
+	"gioui.org/app"
 	"gioui.org/io/key"
+	"gopkg.in/yaml.v3"
 )
 
 var noteMap = map[string]int{
@@ -75,19 +77,32 @@ var unitKeyMap = map[string]string{
 }
 
 // KeyEvent handles incoming key events and returns true if repaint is needed.
-func (t *Tracker) KeyEvent(e key.Event) bool {
+func (t *Tracker) KeyEvent(w *app.Window, e key.Event) bool {
 	if e.State == key.Press {
 		if t.InstrumentNameEditor.Focused() {
 			return false
 		}
 		switch e.Name {
+		case "C":
+			if e.Modifiers.Contain(key.ModShortcut) {
+				contents, err := yaml.Marshal(t.song)
+				if err == nil {
+					w.WriteClipboard(string(contents))
+				}
+				return true
+			}
+		case "V":
+			if e.Modifiers.Contain(key.ModShortcut) {
+				w.ReadClipboard()
+				return true
+			}
 		case "Z":
-			if e.Modifiers.Contain(key.ModCtrl) {
+			if e.Modifiers.Contain(key.ModShortcut) {
 				t.Undo()
 				return true
 			}
 		case "Y":
-			if e.Modifiers.Contain(key.ModCtrl) {
+			if e.Modifiers.Contain(key.ModShortcut) {
 				t.Redo()
 				return true
 			}
@@ -118,14 +133,14 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 		case key.NameUpArrow:
 			switch t.EditMode {
 			case EditPatterns:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.SongRow = SongRow{}
 				} else {
 					t.Cursor.Row -= t.song.RowsPerPattern
 				}
 				t.NoteTracking = false
 			case EditTracks:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Row -= t.song.RowsPerPattern
 				} else {
 					t.Cursor.Row--
@@ -144,14 +159,14 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 		case key.NameDownArrow:
 			switch t.EditMode {
 			case EditPatterns:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Row = t.song.TotalRows() - 1
 				} else {
 					t.Cursor.Row += t.song.RowsPerPattern
 				}
 				t.NoteTracking = false
 			case EditTracks:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Row += t.song.RowsPerPattern
 				} else {
 					t.Cursor.Row++
@@ -170,13 +185,13 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 		case key.NameLeftArrow:
 			switch t.EditMode {
 			case EditPatterns:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Track = 0
 				} else {
 					t.Cursor.Track--
 				}
 			case EditTracks:
-				if t.CursorColumn == 0 || !t.TrackShowHex[t.Cursor.Track] || e.Modifiers.Contain(key.ModCtrl) {
+				if t.CursorColumn == 0 || !t.TrackShowHex[t.Cursor.Track] || e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Track--
 					t.CursorColumn = 1
 				} else {
@@ -199,13 +214,13 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 		case key.NameRightArrow:
 			switch t.EditMode {
 			case EditPatterns:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Track = len(t.song.Tracks) - 1
 				} else {
 					t.Cursor.Track++
 				}
 			case EditTracks:
-				if t.CursorColumn == 0 || !t.TrackShowHex[t.Cursor.Track] || e.Modifiers.Contain(key.ModCtrl) {
+				if t.CursorColumn == 0 || !t.TrackShowHex[t.Cursor.Track] || e.Modifiers.Contain(key.ModShortcut) {
 					t.Cursor.Track++
 					t.CursorColumn = 0
 				} else {
@@ -228,7 +243,7 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 		case "+":
 			switch t.EditMode {
 			case EditTracks:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.AdjustSelectionPitch(12)
 				} else {
 					t.AdjustSelectionPitch(1)
@@ -238,7 +253,7 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 		case "-":
 			switch t.EditMode {
 			case EditTracks:
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.AdjustSelectionPitch(-12)
 				} else {
 					t.AdjustSelectionPitch(-1)
@@ -285,7 +300,7 @@ func (t *Tracker) KeyEvent(e key.Event) bool {
 				name = strings.ToLower(name)
 			}
 			if val, ok := unitKeyMap[name]; ok {
-				if e.Modifiers.Contain(key.ModCtrl) {
+				if e.Modifiers.Contain(key.ModShortcut) {
 					t.SetUnit(val)
 					return true
 				}

tracker/run.go

@@ -4,6 +4,7 @@ import (
 	"os"
 
 	"gioui.org/app"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/system"
 	"gioui.org/layout"
@@ -21,7 +22,12 @@ func (t *Tracker) Run(w *app.Window) error {
 			case system.DestroyEvent:
 				return e.Err
 			case key.Event:
-				if t.KeyEvent(e) {
+				if t.KeyEvent(w, e) {
+					w.Invalidate()
+				}
+			case clipboard.Event:
+				err := t.UnmarshalSong([]byte(e.Text))
+				if err == nil {
 					w.Invalidate()
 				}
 			case system.FrameEvent:

tracker/songpanel.go

@@ -5,6 +5,7 @@ import (
 	"math"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/layout"
 	"gioui.org/op"
 	"gioui.org/op/clip"
@@ -12,6 +13,7 @@ import (
 	"gioui.org/unit"
 	"gioui.org/widget/material"
 	"golang.org/x/exp/shiny/materialdesign/icons"
+	"gopkg.in/yaml.v3"
 )
 
 func (t *Tracker) layoutSongPanel(gtx C) D {
@@ -41,6 +43,12 @@ func (t *Tracker) layoutSongButtons(gtx C) D {
 		t.SaveSongFile()
 	}
 
+	for t.CopySongBtn.Clicked() {
+		if contents, err := yaml.Marshal(t.song); err == nil {
+			clipboard.WriteOp{Text: string(contents)}.Add(gtx.Ops)
+		}
+	}
+
 	newBtnStyle := material.IconButton(t.Theme, t.NewSongFileBtn, widgetForIcon(icons.ContentClear))
 	newBtnStyle.Background = transparent
 	newBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
@@ -51,10 +59,16 @@ func (t *Tracker) layoutSongButtons(gtx C) D {
 	loadBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
 	loadBtnStyle.Color = primaryColor
 
+	copySongBtnStyle := material.IconButton(t.Theme, t.CopySongBtn, widgetForIcon(icons.ContentContentCopy))
+	copySongBtnStyle.Background = transparent
+	copySongBtnStyle.Inset = layout.UniformInset(unit.Dp(6))
+	copySongBtnStyle.Color = primaryColor
+
 	menuContents := func(gtx C) D {
 		return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
 			layout.Rigid(newBtnStyle.Layout),
 			layout.Rigid(loadBtnStyle.Layout),
+			layout.Rigid(copySongBtnStyle.Layout),
 		)
 	}
 

tracker/tracker.go

@@ -1,6 +1,8 @@
 package tracker
 
 import (
+	"encoding/json"
+	"errors"
 	"fmt"
 	"strings"
 	"sync"
@@ -11,6 +13,7 @@ import (
 	"gioui.org/widget"
 	"gioui.org/widget/material"
 	"github.com/vsariola/sointu"
+	"gopkg.in/yaml.v3"
 )
 
 type EditMode int
@@ -50,6 +53,7 @@ type Tracker struct {
 	TrackVoices           *NumberInput
 	InstrumentNameEditor  *widget.Editor
 	NewTrackBtn           *widget.Clickable
+	CopySongBtn           *widget.Clickable
 	NewInstrumentBtn      *widget.Clickable
 	DeleteInstrumentBtn   *widget.Clickable
 	LoadSongFileBtn       *widget.Clickable
@@ -107,6 +111,20 @@ func (t *Tracker) LoadSong(song sointu.Song) error {
 	return nil
 }
 
+func (t *Tracker) UnmarshalSong(bytes []byte) error {
+	var song sointu.Song
+	if errJSON := json.Unmarshal(bytes, &song); errJSON != nil {
+		if errYaml := yaml.Unmarshal(bytes, &song); errYaml != nil {
+			return fmt.Errorf("the song could not be parsed as .json (%v) or .yml (%v)", errJSON, errYaml)
+		}
+	}
+	if song.BPM > 0 {
+		t.LoadSong(song)
+		return nil
+	}
+	return errors.New("was able to unmarshal a song, but the bpm was 0")
+}
+
 func clamp(a, min, max int) int {
 	if a < min {
 		return min
@@ -631,6 +649,7 @@ func New(audioContext sointu.AudioContext, synthService sointu.SynthService) *Tr
 		NewInstrumentBtn:      new(widget.Clickable),
 		DeleteInstrumentBtn:   new(widget.Clickable),
 		NewSongFileBtn:        new(widget.Clickable),
+		CopySongBtn:           new(widget.Clickable),
 		FileMenuBtn:           new(widget.Clickable),
 		LoadSongFileBtn:       new(widget.Clickable),
 		SaveSongFileBtn:       new(widget.Clickable),