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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/layout"
"volute/gui/text"
"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}
interpolator = xdraw.ApproxBiLinear
)
type Node[T any] struct {
Label string
Value T
Children []Node[T]
expanded bool
}
func Tree[T any](trees []Node[T], r image.Rectangle, focus FocusSlave, mux *gui.Mux, wg *sync.WaitGroup) {
defer wg.Done()
var nodes []string
for _, root := range trees {
nodes = append(nodes, flatten(root, 0)...)
}
bounds := layout.Grid{
Rows: populate(make([]int, len(nodes)), 1),
Background: color.Gray{255},
Gap: 1,
Split: layout.EvenSplit,
SplitRows: layout.TextRowSplit,
Margin: 0,
Border: 0,
BorderColor: color.Gray{16},
Flip: false,
}.Lay(r)
for i := range nodes {
wg.Add(1)
go Label(nodes[i], bounds[i], mux.MakeEnv(), wg)
}
/*
globalFocus := focus;
localFocus := NewFocusMaster([]int{1, 1, 1});
defer localFocus.Close()
*/
// TODO
}
func flatten[T any](root Node[T], depth int) []string {
indent := string(populate(make([]byte, 2*depth), ' '))
nodes := []string{indent + root.Label}
root.expanded = true // TODO: remove me
if root.expanded {
for _, c := range root.Children {
nodes = append(nodes, flatten(c, depth+1)...)
}
}
return nodes
}
func populate[T any](arr []T, v T) []T {
for i := range arr {
arr[i] = v
}
return arr
}
func Label(str string, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
redraw := func(drw draw.Image) image.Rectangle {
text.Draw([]byte(str), 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)
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)
} else {
text.Draw(str, drw, r, GREEN, WHITE)
}
return r
}
}
func Output(val <-chan float64, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
var v float64 = 0.0
env.Draw() <- outputDraw(v, r)
Loop:
for {
select {
case v = <-val:
env.Draw() <- outputDraw(v, r)
case event, ok := <-env.Events():
if !ok { // channel closed
break Loop
}
if event, ok := event.(win.WiFocus); ok && event.Focused {
env.Draw() <- outputDraw(v, r)
}
}
}
}
func outputDraw(v float64, r image.Rectangle) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
text.Draw([]byte(fmt.Sprintf("%.3f", v)), drw, r, BLACK, WHITE)
return r
}
}
func Image(imChan <-chan image.Image, r image.Rectangle, env gui.Env, wg *sync.WaitGroup) {
defer wg.Done()
defer close(env.Draw())
var im image.Image = image.NewGray(r)
for {
select {
case im = <-imChan:
env.Draw() <- imageDraw(im, r)
case event, ok := <-env.Events():
if !ok {
return
}
if event, ok := event.(win.WiFocus); ok && event.Focused {
env.Draw() <- imageDraw(im, r)
}
}
}
}
func imageDraw(im image.Image, r image.Rectangle) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
interpolator.Scale(drw, r, im, im.Bounds(), draw.Src, nil)
return r
}
}
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
}
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