100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
package mujica
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import (
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"log/slog"
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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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// SwitchOptions configure a Switch.
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type SwitchOptions struct {
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Disabled bool
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// Loading shows a pending result: the switch keeps its place and takes no input.
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Loading bool
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// Description is read out after the label.
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Description string
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}
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const (
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switchW float32 = 36
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switchH float32 = 20
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switchK float32 = 14
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)
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// Switch turns *on over by click or Space; Changed reports it, the caller applies it.
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func Switch(c *ui.Context, on *bool, label string, opts SwitchOptions) *ui.Element {
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k := Tokens(c)
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d := Density(c)
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blocked := opts.Disabled || opts.Loading
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var sw *ui.Element
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// Disabled on a wrapper, and a copy, block the base before it takes input.
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ui.Row(c).Shrink(0).Disabled(blocked).Children(func() {
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sw = ui.SwitchBase(c, choiceTarget(on, blocked)).Gap(d.Unit() * 2).AlignItems(ui.Center).
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MinHeight(d.ControlHeight()).FocusRing(false)
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})
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if opts.Description != "" {
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sw.Description(opts.Description)
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}
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if sw.Changed() {
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slog.Debug("mujica: switch changed", "label", label, "on", *on)
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}
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hover := sw.Hovered()
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pos := sw.Animate("on", switchFloat(*on), Motion(c, theme.StateDuration))
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sw.Children(func() {
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track := ui.Box(c).Size(switchW, switchH).Shrink(0).Radius(theme.CardRadius)
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bg, border := k.Surface, k.ControlBorder
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thumb := k.ControlBorder
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if *on {
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bg, border, thumb = k.Accent, k.Accent, k.OnAccent
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if hover {
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bg, border = k.AccentHover, k.AccentHover
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}
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} else if hover {
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bg, border, thumb = k.SurfaceHover, k.Text, k.Text
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}
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track.Background(bg).Border(theme.BorderWidth, border)
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track.Draw(func(p *ui.Painter, r ui.Rect) {
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if *on {
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// A short upright bar marks "on" without relying on color.
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p.Fill(ui.Rect{X: r.X + 9, Y: r.Y + 6, W: 1.5, H: r.H - 12}, k.OnAccent, 0)
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}
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})
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track.DrawOver(func(p *ui.Painter, r ui.Rect) {
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if sw.FocusVisible() {
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internal.FocusRing(p, r, theme.CardRadius, k.Focus)
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}
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})
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inset := (switchH - switchK) / 2
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x := inset + pos*(switchW-switchK-2*inset)
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track.Children(func() {
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t := ui.Box(c).Absolute().Left(x).Top(inset).Size(switchK, switchK).Radius(theme.ControlRadius).Background(thumb).Center()
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if opts.Loading {
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t.Children(func() { Spinner(c, SpinnerOptions{Size: 10, Color: bg}) })
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}
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})
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if label != "" {
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ui.Text(c, label).SingleLine()
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}
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})
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return sw
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}
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// choiceTarget is v, or a throwaway copy of it while input is blocked.
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func choiceTarget[T any](v *T, blocked bool) *T {
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if !blocked {
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return v
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}
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cp := *v
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return &cp
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}
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func switchFloat(b bool) float32 {
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if b {
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return 1
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}
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return 0
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}
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