standardize info message between lyrics viewer and radios page

ui/browsing/radiospage.go

@@ -60,18 +60,10 @@ func newRadiosPage(contr *controller.Controller, rp mediaprovider.RadioProvider,
 	a.searcher.OnSearched = a.onSearched
 	a.searcher.Entry.Text = searchText
 
-	a.noRadiosMsg = container.NewCenter(
-		container.New(layout.NewCustomPaddedVBoxLayout(-10),
-			container.NewCenter(
-				container.NewBorder(nil, nil,
-					widget.NewIcon(theme.InfoIcon()), nil,
-					widget.NewRichText(&widget.TextSegment{
-						Text:  "No radio stations available",
-						Style: widget.RichTextStyleSubHeading,
-					}))),
-			widget.NewLabel("Configure your music server to add radio stations"),
-		),
-	)
+	a.noRadiosMsg = container.NewCenter(widgets.NewInfoMessage(
+		"No radio stations available",
+		"Configure your music server to add radio stations",
+	))
 	a.noRadiosMsg.Hide()
 
 	a.buildContainer()

ui/widgets/infomessage.go

@@ -0,0 +1,25 @@
+package widgets
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+)
+
+func NewInfoMessage(title, subtitle string) fyne.CanvasObject {
+	c := container.New(layout.NewCustomPaddedVBoxLayout(-10),
+		container.NewCenter(
+			container.NewBorder(nil, nil,
+				widget.NewIcon(theme.InfoIcon()), nil,
+				widget.NewRichText(&widget.TextSegment{
+					Text:  title,
+					Style: widget.RichTextStyleSubHeading,
+				}))),
+	)
+	if subtitle != "" {
+		c.Add(container.NewCenter(widget.NewLabel(subtitle)))
+	}
+	return c
+}

ui/widgets/lyricsviewer.go

@@ -12,7 +12,7 @@ import (
 type LyricsViewer struct {
 	widget.BaseWidget
 
-	noLyricsLabel widget.Label
+	noLyricsMsg   fyne.CanvasObject
 	viewer        *fynelyrics.LyricsViewer
 	lyrics        *mediaprovider.Lyrics
 	nextLyricLine int
@@ -27,11 +27,13 @@ type LyricsViewer struct {
 }
 
 func NewLyricsViewer() *LyricsViewer {
-	l := &LyricsViewer{noLyricsLabel: widget.Label{
-		Text: "Lyrics not available",
-	}, isEmpty: true}
+	l := &LyricsViewer{
+		noLyricsMsg: container.NewCenter(NewInfoMessage(
+			"Lyrics not available", "")),
+		isEmpty: true,
+	}
 	l.ExtendBaseWidget(l)
-	l.container = container.NewStack(&l.noLyricsLabel)
+	l.container = container.NewStack(l.noLyricsMsg)
 	return l
 }
 
@@ -41,7 +43,7 @@ func (l *LyricsViewer) SetLyrics(lyrics *mediaprovider.Lyrics) {
 	l.firstUpdate = true
 	if lyrics == nil || len(lyrics.Lines) == 0 {
 		if !l.isEmpty {
-			l.container.Objects[0] = &l.noLyricsLabel
+			l.container.Objects[0] = l.noLyricsMsg
 			l.isEmpty = true
 			l.Refresh()
 		}