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
|
package widgets
import (
"strings"
"sync/atomic"
"time"
"github.com/gdamore/tcell/v2"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
)
type Spinner struct {
frame int64 // access via atomic
frames []string
stop chan struct{}
style tcell.Style
}
func NewSpinner(uiConf *config.UIConfig) *Spinner {
spinner := Spinner{
stop: make(chan struct{}),
frame: -1,
frames: strings.Split(uiConf.Spinner, uiConf.SpinnerDelimiter),
style: uiConf.GetStyle(config.STYLE_SPINNER),
}
return &spinner
}
func (s *Spinner) Start() {
if s.IsRunning() {
return
}
atomic.StoreInt64(&s.frame, 0)
go func() {
defer logging.PanicHandler()
for {
select {
case <-s.stop:
atomic.StoreInt64(&s.frame, -1)
s.stop <- struct{}{}
return
case <-time.After(200 * time.Millisecond):
atomic.AddInt64(&s.frame, 1)
ui.QueueRedraw()
}
}
}()
}
func (s *Spinner) Stop() {
if !s.IsRunning() {
return
}
s.stop <- struct{}{}
<-s.stop
s.Invalidate()
}
func (s *Spinner) IsRunning() bool {
return atomic.LoadInt64(&s.frame) != -1
}
func (s *Spinner) Draw(ctx *ui.Context) {
if !s.IsRunning() {
s.Start()
}
cur := int(atomic.LoadInt64(&s.frame) % int64(len(s.frames)))
ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', s.style)
col := ctx.Width()/2 - len(s.frames[0])/2 + 1
ctx.Printf(col, 0, s.style, "%s", s.frames[cur])
}
func (s *Spinner) Invalidate() {
ui.Invalidate()
}
|
