72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
package mujica
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import (
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"math"
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"github.com/egoist/mygo/ui"
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"mujicaui/internal"
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"mujicaui/theme"
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)
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// ShimmerOptions configure a Shimmer placeholder.
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type ShimmerOptions struct {
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// Width fills the parent when zero.
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Width float32
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// Height is ControlHeight when zero.
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Height float32
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// Label is read out while loading; empty means "Loading".
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Label string
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}
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// Shimmer shows a sweeping placeholder while loading, then builds content instead.
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func Shimmer(c *ui.Context, loading bool, opts ShimmerOptions, content func()) *ui.Element {
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if !(opts.Width >= 0) || !(opts.Height >= 0) || math.IsInf(float64(opts.Width+opts.Height), 1) {
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panic("mujica: Shimmer size must be finite and not negative")
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}
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if !loading {
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box := ui.Column(c).AlignItems(ui.Stretch)
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if content != nil {
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box.Children(content)
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}
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return box
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}
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k := Tokens(c)
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h := opts.Height
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if h == 0 {
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h = Density(c).ControlHeight()
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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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fill := k.SurfaceHover
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if k.Dark {
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fill = k.Border
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}
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still := c.Preferences().ReduceMotion
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e := ui.Column(c).Height(h).AlignItems(ui.Stretch).Role(ui.RoleProgress).Label(label)
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if opts.Width > 0 {
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e.Width(opts.Width)
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} else {
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e.FillWidth()
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}
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// Keyed by motion so a flip repaints.
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e.Children(func() {
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ui.Box(c).Key(still).Grow(1).Role(ui.RoleNone).Draw(func(p *ui.Painter, r ui.Rect) {
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p.Fill(r, fill, theme.CardRadius)
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if still {
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return
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}
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p.AnimationFrame()
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t := float32(p.Now().UnixMilli()%1600) / 1600
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band := max(r.W*0.25, 24)
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x := internal.Snap(p, r.X-band+(r.W+band)*t)
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p.Clip(r, theme.CardRadius, func() {
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p.Fill(ui.Rect{X: x, Y: r.Y, W: band, H: r.H}, k.Surface.Alpha(0.55), 0)
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})
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})
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})
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return e
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}
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