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|
package widget
import (
"fmt"
"image"
"image/draw"
"sync"
"volute/gui"
"volute/gui/text"
"volute/gui/win"
)
func Input(val chan<- uint, r image.Rectangle, focus FocusSlave, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
defer close(val)
text := []byte{'0'}
focused := false
env.Draw() <- inputDraw(text, focused, r)
Loop:
for {
select {
case _, ok := <-focus.gain:
if !ok {
break Loop
}
focused = true
env.Draw() <- inputDraw(text, focused, r)
case dir, ok := <-focus.lose:
if !ok {
break Loop
}
focus.yield <- dir
focused = false
env.Draw() <- inputDraw(text, focused, r)
case event, ok := <-env.Events():
if !ok {
break Loop
}
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- inputDraw(text, focused, r)
}
case win.KbType:
if focused && isDigit(event.Rune) {
text = fmt.Appendf(text, "%c", event.Rune)
env.Draw() <- inputDraw(text, focused, r)
val <- atoi(text)
}
case win.KbDown:
if focused && event.Key == win.KeyBackspace && len(text) > 0 {
text = text[:len(text)-1]
env.Draw() <- inputDraw(text, focused, r)
val <- atoi(text)
}
}
}
}
}
func inputDraw(str []byte, focused bool, r image.Rectangle) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
if focused {
text.Draw(str, drw, r, GREEN, FOCUS_COLOR, text.ALIGN_RIGHT)
} else {
text.Draw(str, drw, r, GREEN, WHITE, text.ALIGN_RIGHT)
}
return r
}
}
func isDigit(r rune) bool {
return '0' <= r && r <= '9'
}
func atoi(s []byte) uint {
var n uint = 0
for _, d := range s {
n = n*10 + uint(d-'0')
}
return n
}
|