make artist image displayable in pop-up

ui/util/util.go

@@ -6,6 +6,8 @@ import (
 	"math"
 	"strings"
 
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/widget"
 	"golang.org/x/net/html"
 )
@@ -26,6 +28,32 @@ func ImageAspect(im image.Image) float32 {
 	return float32(b.Max.X-b.Min.X) / float32(b.Max.Y-b.Min.Y)
 }
 
+type PopUpProvider interface {
+	CreatePopUp(fyne.CanvasObject) *widget.PopUp
+	WindowSize() fyne.Size
+}
+
+func ShowPopUpImage(img image.Image, popUpProvider PopUpProvider) {
+	im := canvas.NewImageFromImage(img)
+	im.FillMode = canvas.ImageFillContain
+	pop := popUpProvider.CreatePopUp(im)
+	s := popUpProvider.WindowSize()
+	var popS fyne.Size
+	if asp := ImageAspect(img); s.Width/s.Height > asp {
+		// window height is limiting factor
+		h := s.Height * 0.8
+		popS = fyne.NewSize(h*asp, h)
+	} else {
+		w := s.Width * 0.8
+		popS = fyne.NewSize(w, w*(1/asp))
+	}
+	pop.Resize(popS)
+	pop.ShowAtPosition(fyne.NewPos(
+		(s.Width-popS.Width)/2,
+		(s.Height-popS.Height)/2,
+	))
+}
+
 func RichTextSegsFromHTMLString(s string) []widget.RichTextSegment {
 	tokr := html.NewTokenizer(strings.NewReader(s))
 	var segs []widget.RichTextSegment