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package widget
import (
"cmp"
"fmt"
"sync"
xdraw "golang.org/x/image/draw"
"image"
"image/color"
"image/draw"
"volute/gui"
"volute/gui/win"
)
var (
FOCUS_COLOR = color.RGBA{179, 217, 255, 255}
GREEN = color.RGBA{51, 102, 0, 255}
BLACK = color.Gray{0}
WHITE = color.Gray{255}
)
func Label(text string, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
redraw := func(drw draw.Image) image.Rectangle {
drawText([]byte(text), drw, r, BLACK, WHITE)
return r
}
env.Draw() <- redraw
for event := range env.Events() {
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- redraw
}
}
}
}
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)
redraw := func(text []byte, haveFocus bool) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
if haveFocus {
drawText(text, drw, r, GREEN, FOCUS_COLOR)
} else {
drawText(text, drw, r, GREEN, WHITE)
}
return r
}
}
text := []byte{'0'}
haveFocus := false
env.Draw() <- redraw(text, haveFocus)
Loop:
for {
select {
case haveFocus = <-focus.Focus:
env.Draw() <- redraw(text, haveFocus)
case event, ok := <-env.Events():
if !ok { // channel closed
break Loop
}
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- redraw(text, haveFocus)
}
case win.KbType:
if haveFocus && isDigit(event.Rune) {
text = fmt.Appendf(text, "%c", event.Rune)
env.Draw() <- redraw(text, haveFocus)
val <- atoi(text)
}
case win.KbDown:
if haveFocus && event.Key == win.KeyBackspace && len(text) > 0 {
text = text[:len(text)-1]
env.Draw() <- redraw(text, haveFocus)
val <- atoi(text)
}
}
}
}
}
func Output(val <-chan float64, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
redraw := func(v float64) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
drawText([]byte(fmt.Sprintf("%.3f", v)), drw, r, BLACK, WHITE)
return r
}
}
var v float64 = 0.0
env.Draw() <- redraw(v)
Loop:
for {
select {
case v = <-val:
env.Draw() <- redraw(v)
case event, ok := <-env.Events():
if !ok { // channel closed
break Loop
}
if event, ok := event.(win.WiFocus); ok && event.Focused {
env.Draw() <- redraw(v)
}
}
}
}
func Image(imChan <-chan image.Image, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
interp := xdraw.ApproxBiLinear
redraw := func(im image.Image) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
interp.Scale(drw, r, im, im.Bounds(), draw.Src, nil)
return r
}
}
var im image.Image = image.NewGray(r)
for {
select {
case im = <-imChan:
env.Draw() <- redraw(im)
case event, ok := <-env.Events():
if !ok {
return
}
if event, ok := event.(win.WiFocus); ok && event.Focused {
env.Draw() <- redraw(im)
}
}
}
}
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
}
|