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package widget
import (
"cmp"
"fmt"
"image"
"image/draw"
"volute/gui"
"volute/gui/win"
)
func Label(text string, r image.Rectangle, env gui.Env) {
redraw := func(drw draw.Image) image.Rectangle {
drawText([]byte(text), drw, r)
return r
}
env.Draw() <- redraw
for event := range env.Events() {
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- redraw
}
}
}
close(env.Draw())
}
func Input(val chan<- uint, r image.Rectangle, focusChan <-chan bool, env gui.Env) {
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 {
select {
case focus = <-focusChan:
case event := <-env.Events():
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- redraw(text)
}
case win.KbType:
if focus && isDigit(event.Rune) {
text = fmt.Appendf(text, "%c", event.Rune)
env.Draw() <- redraw(text)
val <- atoi(text)
}
case win.KbDown:
if focus && event.Key == win.KeyBackspace && len(text) > 0 {
text = text[:len(text)-1]
env.Draw() <- redraw(text)
val <- atoi(text)
}
}
}
}
close(env.Draw())
}
func Output(val <-chan uint, r image.Rectangle, env gui.Env) {
redraw := func(n uint) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
drawText([]byte(fmt.Sprint(n)), drw, r)
return r
}
}
var n uint = 0
env.Draw() <- redraw(n)
Loop:
for {
select {
case n = <-val:
env.Draw() <- redraw(n)
case event, ok := <-env.Events():
if !ok { // channel closed
break Loop
}
if event, ok := event.(win.WiFocus); ok && event.Focused {
env.Draw() <- redraw(n)
}
}
}
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
}
func atoi(s []byte) uint {
var n uint = 0
for _, d := range s {
n = n*10 + uint(d-'0')
}
return n
}
|