69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
package mujica
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
|
|
"github.com/egoist/mygo/ui"
|
|
|
|
"mujicaui/internal"
|
|
)
|
|
|
|
// SpinnerOptions configure a Spinner. Size is 16 DIPs when zero.
|
|
type SpinnerOptions struct {
|
|
Size float32
|
|
// Label is read out and shown beside the mark; empty uses "Loading" unread on screen.
|
|
Label string
|
|
ShowLabel bool
|
|
// Color paints the mark; zero uses AccentText.
|
|
Color ui.Color
|
|
}
|
|
|
|
// Spinner turns four diamonds only while painted; hidden or under reduced motion it stops.
|
|
func Spinner(c *ui.Context, opts SpinnerOptions) *ui.Element {
|
|
if !(opts.Size >= 0) || math.IsInf(float64(opts.Size), 1) {
|
|
panic(fmt.Sprintf("mujica: Spinner Size %v invalid", opts.Size))
|
|
}
|
|
k := Tokens(c)
|
|
size := opts.Size
|
|
if size == 0 {
|
|
size = 16
|
|
}
|
|
label := opts.Label
|
|
if label == "" {
|
|
label = msg(c, "loading")
|
|
}
|
|
color := opts.Color
|
|
if color.A == 0 {
|
|
color = k.AccentText
|
|
}
|
|
still := c.Preferences().ReduceMotion
|
|
row := ui.Row(c).Gap(Density(c).Unit() * 2).AlignItems(ui.Center)
|
|
row.Children(func() {
|
|
// Keyed by motion so a flip repaints; MyGo's spinner carries the progress role.
|
|
ui.Box(c).Key(still).Shrink(0).Children(func() { spinnerMark(c, label, size, color, still) })
|
|
if opts.ShowLabel {
|
|
ui.Text(c, label).TextColor(k.TextMuted).SingleLine()
|
|
}
|
|
})
|
|
return row
|
|
}
|
|
|
|
func spinnerMark(c *ui.Context, label string, size float32, color ui.Color, still bool) {
|
|
ui.Spinner(c).Label(label).Size(size, size).Draw(func(p *ui.Painter, r ui.Rect) {
|
|
turn := 0.0
|
|
if !still {
|
|
turn = float64(p.Now().UnixMilli()%1200) / 1200
|
|
p.AnimationFrame()
|
|
}
|
|
cx, cy, rad := r.X+r.W/2, r.Y+r.H/2, r.W*0.32
|
|
for i := range 4 {
|
|
a := 2 * math.Pi * (turn + float64(i)/4)
|
|
x := cx + rad*float32(math.Cos(a))
|
|
y := cy + rad*float32(math.Sin(a))
|
|
alpha := 1 - float32(i)*0.22
|
|
p.FillPath(internal.Diamond(internal.Snap(p, x), internal.Snap(p, y), internal.Snap(p, r.W*0.3)), color.Alpha(alpha))
|
|
}
|
|
})
|
|
}
|