95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package input
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import (
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"log/slog"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type SelectOptions struct {
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// Width is in dots; zero fits the longest option.
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Width int
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Disabled bool
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}
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type SelectResult struct {
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Element *ui.Element
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Changed bool
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}
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// Select picks one option from a popup list.
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func Select(c *ui.Context, text string, value *string, options []string, o SelectOptions) SelectResult {
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k := pixel.K(c)
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off := o.Disabled || pixel.Current(c).Inert
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var sel *ui.SelectParts[string]
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var shell, base *ui.Element
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var st pixel.State
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// Re-keying on each off state forgets an open popup.
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ui.Box(c).Key(off).Children(func() {
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shell, base, st = pixel.Shell(c, func() *ui.Element {
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sel = ui.SelectBase(c, value)
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return sel.Trigger.Label(text).Disabled(o.Disabled)
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})
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})
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shell.Size(k.D(pixel.Or("Select Width", o.Width, widest(options)+22)), k.D(pixel.LineHeight+4)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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ink, dy := face(g, Normal, st, sel.Open() && !off)
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g.Text(6, 2+dy, *value, ink, 1)
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g.Sprite(g.W-10, (g.H-tinyDown.H)/2+dy, tinyDown, 0, ink, 1)
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finish(g, st)
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})
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if !off {
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sel.Popup(func(panel *ui.Element) {
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menu(c, panel, func() {
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for _, opt := range options {
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item := sel.Item(opt).Label(opt)
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row(k, item, opt, item.Highlighted(), opt == *value)
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}
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})
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})
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}
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res := SelectResult{Element: shell, Changed: base.Changed()}
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if res.Changed {
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slog.Debug("8bit: select", "label", text, "value", *value)
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}
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return res
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}
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// widest is the widest option's width in dots.
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func widest(options []string) int {
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w := 0
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for _, opt := range options {
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w = max(w, pixel.Measure(opt))
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}
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return w
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}
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// menu frames a popup panel as a game window.
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func menu(c *ui.Context, panel *ui.Element, fn func()) {
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k := pixel.K(c)
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panel.Padding(k.D(3)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Frame(0, 0, g.W, g.H, pixel.Window, pixel.Face)
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}).Children(func() {
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ui.Column(c).AlignItems(ui.Stretch).Children(fn)
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})
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}
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// row draws an option; a hand marks the lit one.
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func row(k pixel.Kit, item *ui.Element, text string, lit, chosen bool) {
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item.Height(k.D(pixel.LineHeight)).MinWidth(k.D(pixel.Measure(text) + 16)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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ink := pixel.Ink
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if chosen {
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ink = pixel.Accent
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}
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if lit {
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g.Rect(0, 0, g.W, g.H, pixel.Lit)
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g.Sprite(1, (g.H-pixel.Hand.H)/2, pixel.Hand, 0, pixel.Edge, 1)
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}
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g.Text(13, 0, text, ink, 1)
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})
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}
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