beginning work on browse by favorite artists and songs

ui/widgets/togglebuttongroup.go

@@ -0,0 +1,64 @@
+package widgets
+
+import (
+	"supersonic/ui/layouts"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+)
+
+type ToggleButtonGroup struct {
+	widget.BaseWidget
+
+	buttonContainer *fyne.Container
+
+	activeBtnIdx int
+}
+
+func NewToggleButtonGroup(activatedBtnIdx int, buttons ...*widget.Button) *ToggleButtonGroup {
+	t := &ToggleButtonGroup{}
+	t.ExtendBaseWidget(t)
+	t.buttonContainer = container.New(&layouts.HboxCustomPadding{DisableThemePad: true})
+	for i, b := range buttons {
+		b.Importance = widget.MediumImportance
+		t.buttonContainer.Add(b)
+		prevOnTapped := b.OnTapped
+		b.OnTapped = func(i int) func() {
+			return func() {
+				if t.onTapped(i) && prevOnTapped != nil {
+					prevOnTapped()
+				}
+			}
+		}(i)
+	}
+	if activatedBtnIdx >= 0 && activatedBtnIdx <= len(buttons) {
+		buttons[activatedBtnIdx].Importance = widget.HighImportance
+	}
+
+	return t
+}
+
+func (t *ToggleButtonGroup) ActivatedButtonIndex() int {
+	return t.activeBtnIdx
+}
+
+func (t *ToggleButtonGroup) onTapped(btnIdx int) bool {
+	for i, b := range t.buttonContainer.Objects {
+		if i == btnIdx {
+			b.(*widget.Button).Importance = widget.HighImportance
+		} else {
+			b.(*widget.Button).Importance = widget.MediumImportance
+		}
+	}
+	changed := t.activeBtnIdx != btnIdx
+	t.activeBtnIdx = btnIdx
+	if changed {
+		t.Refresh()
+	}
+	return changed
+}
+
+func (t *ToggleButtonGroup) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(t.buttonContainer)
+}