111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
package mujica
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import (
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"log/slog"
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"slices"
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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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// RadioItem is one choice of a RadioGroup; Value is its stable identity.
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type RadioItem[T comparable] struct {
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Value T
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Label string
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Disabled bool
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}
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// RadioGroupOptions configure a RadioGroup.
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type RadioGroupOptions struct {
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// Horizontal lays the choices in a row; the default is a column.
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Horizontal bool
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// Label names the group for assistive technology.
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Label string
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Disabled bool
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}
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// RadioGroup chooses one item's Value into *value; arrows move the choice.
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func RadioGroup[T comparable](c *ui.Context, value *T, items []RadioItem[T], opts RadioGroupOptions) ChoiceResult {
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if value == nil {
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panic("mujica: RadioGroup needs a value")
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}
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if len(items) == 0 {
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panic("mujica: RadioGroup needs items")
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}
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seen := make(map[T]bool, len(items))
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for _, it := range items {
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if seen[it.Value] {
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panic("mujica: RadioGroup has a duplicate value")
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}
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seen[it.Value] = true
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}
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k := Tokens(c)
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d := Density(c)
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var r ChoiceResult
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// Disabled on a wrapper blocks the bases' clicks before they choose.
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wrap := ui.Box(c).Shrink(0).Disabled(opts.Disabled)
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// Keys by first appearance of each value: fmt keys would merge equal-looking values.
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known := ui.Local(wrap, "values", func() []T { return nil })
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wrap.Children(func() {
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r.Element = ui.RadioGroup(c, func() {
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for _, it := range items {
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if radioGroupItem(c, k, d, value, it, stableKey(known, it.Value)) {
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r.changed = true
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slog.Debug("mujica: radio_group choose", "label", it.Label)
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}
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}
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}).Label(opts.Label).Gap(0)
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})
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if opts.Horizontal {
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r.Element.Row().Gap(d.Unit() * 6)
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}
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if wrap.IsDisabled() && wrap.FocusWithin() {
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wrap.FocusRing(false).Focus()
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}
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return r
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}
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// radioGroupItem builds one radio and reports whether it was chosen.
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func radioGroupItem[T comparable](c *ui.Context, k theme.Tokens, d theme.Density, value *T, it RadioItem[T], key int) bool {
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// Keyed by value so focus follows the item, not its position.
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var row *ui.Element
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item := ui.Box(c).Key(key).Disabled(it.Disabled)
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item.Children(func() {
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row = ui.RadioBase(c, value, it.Value).Gap(d.Unit() * 2).MinHeight(d.ControlHeight()).FocusRing(false)
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})
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if item.IsDisabled() && item.FocusWithin() {
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item.FocusRing(false).Focus()
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}
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on := *value == it.Value
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hover, pressed := row.Hovered(), row.Pressed()
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row.Children(func() {
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bg, border := checkboxColors(k, on, hover, pressed)
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dot := ui.Box(c).Size(checkboxSize, checkboxSize).Shrink(0).Radius(checkboxSize/2).
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Background(bg).Border(theme.BorderWidth, border)
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dot.Transition(colorFade)
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dot.DrawOver(func(p *ui.Painter, r ui.Rect) {
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if on {
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s := r.W * 0.375
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p.Fill(ui.Rect{X: r.X + (r.W-s)/2, Y: r.Y + (r.H-s)/2, W: s, H: s}, k.OnAccent, s/2)
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}
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if row.FocusVisible() {
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internal.FocusRing(p, r, checkboxSize/2, k.Focus)
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}
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})
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ui.Text(c, it.Label)
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})
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return row.Changed()
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}
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// stableKey keys v by its first appearance in *known, so equal-looking values stay apart.
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func stableKey[T comparable](known *[]T, v T) int {
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i := slices.Index(*known, v)
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if i < 0 {
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i = len(*known)
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*known = append(*known, v)
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}
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return i
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}
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