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package widget
import (
"cmp"
"fmt"
"image"
"image/draw"
"volute/gui"
"volute/gui/win"
)
func Input(env gui.Env, r image.Rectangle, val chan<- float64) {
redraw := func(text []byte) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
drawText(text, drw, r)
return r
}
}
text := []byte{'0'}
focus := false
env.Draw() <- redraw(text)
for event := range env.Events() {
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- redraw(text)
}
case win.MoDown:
if event.Point.In(r) {
focus = true
}
case win.KbType:
if !focus ||
(!isDigit(event.Rune) && event.Rune != '.') ||
(event.Rune == '.' && contains(text, '.')) {
continue
}
text = fmt.Appendf(text, "%c", event.Rune)
env.Draw() <- redraw(text)
case win.KbDown:
if event.Key == win.KeyBackspace && len(text) > 0 {
text = text[:len(text)-1]
env.Draw() <- redraw(text)
}
}
}
close(env.Draw())
}
func isDigit(r rune) bool {
return '0' <= r && r <= '9'
}
func contains[T cmp.Ordered](slc []T, v T) bool {
for i := range slc {
if slc[i] == v {
return true
}
}
return false
}
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