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