1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
package widget
import (
"cmp"
"fmt"
"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) {
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
}
}
}
close(env.Draw())
}
func Input(val chan<- uint, r image.Rectangle, focusChan <-chan bool, env gui.Env) {
redraw := func(text []byte, focus bool) func(draw.Image) image.Rectangle {
return func(drw draw.Image) image.Rectangle {
if focus {
drawText(text, drw, r, GREEN, FOCUS_COLOR)
} else {
drawText(text, drw, r, GREEN, WHITE)
}
return r
}
}
text := []byte{'0'}
focus := false
env.Draw() <- redraw(text, focus)
for {
select {
case focus = <-focusChan:
env.Draw() <- redraw(text, focus)
case event := <-env.Events():
switch event := event.(type) {
case win.WiFocus:
if event.Focused {
env.Draw() <- redraw(text, focus)
}
case win.KbType:
if focus && isDigit(event.Rune) {
text = fmt.Appendf(text, "%c", event.Rune)
env.Draw() <- redraw(text, focus)
val <- atoi(text)
}
case win.KbDown:
if focus && event.Key == win.KeyBackspace && len(text) > 0 {
text = text[:len(text)-1]
env.Draw() <- redraw(text, focus)
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, BLACK, WHITE)
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
}
|