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starrating.go
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starrating.go
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package widgets
import (
"math"
"github.com/dweymouth/supersonic/res"
"github.com/dweymouth/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"
)
var (
themedResStarFilled = theme.NewThemedResource(res.ResStarFilledSvg)
themedResStarOutline = theme.NewThemedResource(res.ResStarOutlineSvg)
)
type StarRating struct {
widget.BaseWidget
Rating int
StarSize float32
OnRatingChanged func(int)
holdRating bool // don't render mouseHoverRating
mouseHoverRating int // zero if not hovered
container *fyne.Container
}
func NewStarRating() *StarRating {
s := &StarRating{}
s.ExtendBaseWidget(s)
return s
}
func (s *StarRating) createContainer() {
s.container = container.New(&layouts.HboxCustomPadding{
DisableThemePad: true,
})
var im *canvas.Image
for i := 0; i < 5; i++ {
if s.Rating > i {
im = canvas.NewImageFromResource(themedResStarFilled)
} else {
im = canvas.NewImageFromResource(themedResStarOutline)
}
im.SetMinSize(fyne.NewSize(s.StarSize, s.StarSize))
s.container.Add(im)
}
}
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 rating > i {
im.Resource = themedResStarFilled
} else {
im.Resource = themedResStarOutline
}
}
s.BaseWidget.Refresh()
}
func (s *StarRating) MinSize() fyne.Size {
return fyne.NewSize(s.StarSize*5, s.StarSize)
}
func (s *StarRating) CreateRenderer() fyne.WidgetRenderer {
if s.container == nil {
s.createContainer()
}
return widget.NewSimpleRenderer(container.NewCenter(s.container))
}