feat: add ability to disable units temporarily

Quite often the user wants to experiment what particular unit(s) add
to the sound. This commit adds ability to disable any set of units
temporarily, without actually deleting them. Ctrl-D disables and
re-enables the units. Disabled units are considered non-existent in
the patch.

Closes #116.

tracker/gioui/instrument_editor.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"
 
+	"gioui.org/font"
 	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/layout"
@@ -343,6 +344,7 @@ func (ie *InstrumentEditor) layoutUnitList(gtx C, t *Tracker) D {
 		}
 		u := units[i]
 		var color color.NRGBA = white
+		f := labelDefaultFont
 
 		var stackText string
 		stackText = strconv.FormatInt(int64(u.StackAfter), 10)
@@ -353,6 +355,10 @@ func (ie *InstrumentEditor) layoutUnitList(gtx C, t *Tracker) D {
 			color = warningColor
 			(*tracker.Alerts)(t.Model).AddNamed("InstrumentLeavesSignals", fmt.Sprintf("Instrument leaves %v signal(s) on the stack", u.StackAfter), tracker.Warning)
 		}
+		if u.Disabled {
+			color = disabledTextColor
+			f.Style = font.Italic
+		}
 
 		stackLabel := LabelStyle{Text: stackText, ShadeColor: black, Color: mediumEmphasisTextColor, Font: labelDefaultFont, FontSize: unit.Sp(12), Shaper: t.Theme.Shaper}
 		rightMargin := layout.Inset{Right: unit.Dp(10)}
@@ -381,7 +387,7 @@ func (ie *InstrumentEditor) layoutUnitList(gtx C, t *Tracker) D {
 					editor.Color = color
 					editor.HintColor = instrumentNameHintColor
 					editor.TextSize = unit.Sp(12)
-					editor.Font = labelDefaultFont
+					editor.Font = f
 
 					defer clip.Rect(image.Rect(0, 0, gtx.Constraints.Max.X, gtx.Constraints.Max.Y)).Push(gtx.Ops).Pop()
 					key.InputOp{Tag: &ie.searchEditor, Keys: globalKeys}.Add(gtx.Ops)
@@ -399,7 +405,7 @@ func (ie *InstrumentEditor) layoutUnitList(gtx C, t *Tracker) D {
 					}
 					return ret
 				} else {
-					unitNameLabel := LabelStyle{Text: u.Type, ShadeColor: black, Color: color, Font: labelDefaultFont, FontSize: unit.Sp(12), Shaper: t.Theme.Shaper}
+					unitNameLabel := LabelStyle{Text: u.Type, ShadeColor: black, Color: color, Font: f, FontSize: unit.Sp(12), Shaper: t.Theme.Shaper}
 					if unitNameLabel.Text == "" {
 						unitNameLabel.Text = "---"
 					}

tracker/gioui/keyevent.go

@@ -64,6 +64,11 @@ func (t *Tracker) KeyEvent(e key.Event, o *op.Ops) {
 				t.Model.Redo().Do()
 				return
 			}
+		case "D":
+			if e.Modifiers.Contain(key.ModShortcut) {
+				t.Model.UnitDisabled().Bool().Toggle()
+				return
+			}
 		case "N":
 			if e.Modifiers.Contain(key.ModShortcut) {
 				t.NewSong().Do()

tracker/gioui/unit_editor.go

@@ -21,25 +21,27 @@ import (
 )
 
 type UnitEditor struct {
-	sliderList    *DragList
-	searchList    *DragList
-	Parameters    []*ParameterWidget
-	DeleteUnitBtn *ActionClickable
-	CopyUnitBtn   *TipClickable
-	ClearUnitBtn  *ActionClickable
-	SelectTypeBtn *widget.Clickable
-	tag           bool
-	caser         cases.Caser
+	sliderList     *DragList
+	searchList     *DragList
+	Parameters     []*ParameterWidget
+	DeleteUnitBtn  *ActionClickable
+	CopyUnitBtn    *TipClickable
+	ClearUnitBtn   *ActionClickable
+	DisableUnitBtn *BoolClickable
+	SelectTypeBtn  *widget.Clickable
+	tag            bool
+	caser          cases.Caser
 }
 
 func NewUnitEditor(m *tracker.Model) *UnitEditor {
 	ret := &UnitEditor{
-		DeleteUnitBtn: NewActionClickable(m.DeleteUnit()),
-		ClearUnitBtn:  NewActionClickable(m.ClearUnit()),
-		CopyUnitBtn:   new(TipClickable),
-		SelectTypeBtn: new(widget.Clickable),
-		sliderList:    NewDragList(m.Params().List(), layout.Vertical),
-		searchList:    NewDragList(m.SearchResults().List(), layout.Vertical),
+		DeleteUnitBtn:  NewActionClickable(m.DeleteUnit()),
+		ClearUnitBtn:   NewActionClickable(m.ClearUnit()),
+		DisableUnitBtn: NewBoolClickable(m.UnitDisabled().Bool()),
+		CopyUnitBtn:    new(TipClickable),
+		SelectTypeBtn:  new(widget.Clickable),
+		sliderList:     NewDragList(m.Params().List(), layout.Vertical),
+		searchList:     NewDragList(m.SearchResults().List(), layout.Vertical),
 	}
 	ret.caser = cases.Title(language.English)
 	return ret
@@ -114,6 +116,7 @@ func (pe *UnitEditor) layoutFooter(gtx C, t *Tracker) D {
 	}
 	copyUnitBtnStyle := TipIcon(t.Theme, pe.CopyUnitBtn, icons.ContentContentCopy, "Copy unit (Ctrl+C)")
 	deleteUnitBtnStyle := ActionIcon(t.Theme, pe.DeleteUnitBtn, icons.ActionDelete, "Delete unit (Ctrl+Backspace)")
+	disableUnitBtnStyle := ToggleIcon(t.Theme, pe.DisableUnitBtn, icons.AVVolumeUp, icons.AVVolumeOff, "Disable unit (Ctrl-D)", "Enable unit (Ctrl-D)")
 	text := t.Units().SelectedType()
 	if text == "" {
 		text = "Choose unit type"
@@ -124,6 +127,7 @@ func (pe *UnitEditor) layoutFooter(gtx C, t *Tracker) D {
 	return layout.Flex{Axis: layout.Horizontal, Alignment: layout.Middle}.Layout(gtx,
 		layout.Rigid(deleteUnitBtnStyle.Layout),
 		layout.Rigid(copyUnitBtnStyle.Layout),
+		layout.Rigid(disableUnitBtnStyle.Layout),
 		layout.Rigid(func(gtx C) D {
 			var dims D
 			if t.Units().SelectedType() != "" {