64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
package input
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import (
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"log/slog"
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"strings"
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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 AutocompleteOptions struct {
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Placeholder string
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// Width is in dots; zero means 120.
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Width int
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Disabled bool
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}
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type AutocompleteResult struct {
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Element *ui.Element
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// Accepted reports a completion taken by Tab or Enter.
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Changed, Accepted, Submitted bool
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}
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// Autocomplete ghosts the first completion; Tab or Enter takes it.
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func Autocomplete(c *ui.Context, text string, value *string, suggestions []string, o AutocompleteOptions) AutocompleteResult {
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k := pixel.K(c)
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ed, e := field(c, value, pixel.EditorOptions{Label: text, Placeholder: o.Placeholder, Disabled: o.Disabled}, o.Width, nil, nil, nil)
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res := AutocompleteResult{Element: e, Changed: ed.Changed, Submitted: ed.Submitted}
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best := completion(suggestions, *value)
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tab, enter := best != "" && e.Shortcut(0, ui.KeyTab), best != "" && e.Shortcut(0, ui.KeyEnter)
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if tab || enter {
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*value, res.Changed, res.Accepted = best, true, true
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slog.Debug("8bit: autocomplete accepted", "label", text, "value", best)
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return res
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}
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if best != "" {
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ed.Input.Description(best)
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typed := *value
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ed.Element.DrawOver(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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rest := string([]rune(best)[len([]rune(typed)):])
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if x := pixel.Measure(typed); x+pixel.Measure(rest) <= g.W {
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g.Text(x, 0, rest, pixel.Faint, 1)
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}
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})
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}
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return res
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}
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// completion is the first suggestion extending v, ignoring case.
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func completion(suggestions []string, v string) string {
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if v == "" {
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return ""
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}
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n := len([]rune(v))
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for _, s := range suggestions {
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if r := []rune(s); len(r) > n && strings.EqualFold(string(r[:n]), v) {
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return s
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}
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}
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return ""
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}
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