add hover + click behavior

ui/widgets/starrating.go

@@ -1,12 +1,14 @@
 package widgets
 
 import (
+	"math"
 	"supersonic/res"
 	"supersonic/ui/layouts"
 
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/driver/desktop"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
 )
@@ -17,7 +19,7 @@ var (
 )
 
 const (
-	starRatingBetweenStarPad = 2
+	starRatingBetweenStarPad = 1
 )
 
 type StarRating struct {
@@ -26,7 +28,11 @@ type StarRating struct {
 	Rating   int
 	StarSize float32
 
-	container *fyne.Container
+	OnRatingChanged func(int)
+
+	holdRating       bool // don't render mouseHoverRating
+	mouseHoverRating int  // zero if not hovered
+	container        *fyne.Container
 }
 
 func NewStarRating() *StarRating {
@@ -52,15 +58,58 @@ func (s *StarRating) createContainer() {
 	}
 }
 
+var _ desktop.Hoverable = (*StarRating)(nil)
+
+func (s *StarRating) MouseIn(e *desktop.MouseEvent) {
+	s.MouseMoved(e)
+}
+
+func (s *StarRating) MouseMoved(e *desktop.MouseEvent) {
+	hoverRating := int(math.Ceil(5 * float64(e.Position.X/s.Size().Width)))
+	if s.mouseHoverRating != hoverRating {
+		s.holdRating = false
+		s.mouseHoverRating = hoverRating
+		s.Refresh()
+	}
+}
+
+func (s *StarRating) MouseOut() {
+	s.mouseHoverRating = 0
+	s.holdRating = false
+	s.Refresh()
+}
+
+var _ fyne.Tappable = (*StarRating)(nil)
+
+func (s *StarRating) Tapped(*fyne.PointEvent) {
+	if s.mouseHoverRating <= 0 {
+		return //shouldn't happen
+	}
+	if s.Rating == s.mouseHoverRating {
+		s.Rating = 0
+	} else {
+		s.Rating = s.mouseHoverRating
+	}
+	s.holdRating = true
+	s.Refresh()
+	if s.OnRatingChanged != nil {
+		s.OnRatingChanged(s.Rating)
+	}
+}
+
 func (s *StarRating) Refresh() {
 	// widget has not had renderer created yet
 	if s.container == nil {
 		return
 	}
+	rating := s.Rating
+	if !s.holdRating && s.mouseHoverRating > 0 {
+		rating = s.mouseHoverRating
+	}
 	for i := 0; i < 5; i++ {
 		im := s.container.Objects[i].(*canvas.Image)
 		im.SetMinSize(fyne.NewSize(s.StarSize, s.StarSize))
-		if s.Rating > i {
+		if rating > i {
 			im.Resource = themedResStarFilled
 		} else {
 			im.Resource = themedResStarOutline