44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
package mujica
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import (
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"github.com/egoist/mygo/ui"
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)
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// ShimmerTextOptions configure a ShimmerText.
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type ShimmerTextOptions struct {
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// Active sweeps the light; false shows plain muted text.
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Active bool
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}
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// ShimmerText sweeps light across a status such as "Thinking".
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func ShimmerText(c *ui.Context, text string, opts ShimmerTextOptions) *ui.Element {
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if text == "" {
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panic("mujica: ShimmerText needs text")
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}
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k := Tokens(c)
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still := c.Preferences().ReduceMotion
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if !opts.Active || still {
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e := ui.Text(c, text).TextColor(k.TextMuted).SingleLine()
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if opts.Active {
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e.Role(ui.RoleStatus)
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}
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return e
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}
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runes := []rune(text)
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size := c.Theme().FontSize
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// The text keeps layout and name; the sweep paints over.
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e := ui.Text(c, text).TextColor(ui.Transparent).Role(ui.RoleStatus).SingleLine()
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e.DrawOver(func(p *ui.Painter, r ui.Rect) {
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p.AnimationFrame()
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t := float32(p.Now().UnixMilli()%1800) / 1800
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at := t*float32(len(runes)+6) - 3
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spans := make([]ui.Span, len(runes))
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for i, ch := range runes {
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d := max(0, 1-abs32(float32(i)-at)/3)
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spans[i] = ui.Span{Text: string(ch), Size: size, Color: k.TextMuted.Mix(k.Text, d)}
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}
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p.Clip(r, 0, func() { p.RichText(r.X, r.Y, 0, spans...) })
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})
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return e
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}
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