aerc/widgets/spinner.go

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package widgets
import (
"strings"
"sync/atomic"
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"time"
"github.com/gdamore/tcell/v2"
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"git.sr.ht/~sircmpwn/aerc/config"
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"git.sr.ht/~sircmpwn/aerc/lib/ui"
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)
type Spinner struct {
ui.Invalidatable
frame int64 // access via atomic
frames []string
stop chan struct{}
style tcell.Style
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}
func NewSpinner(uiConf *config.UIConfig) *Spinner {
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spinner := Spinner{
stop: make(chan struct{}),
frame: -1,
frames: strings.Split(uiConf.Spinner, uiConf.SpinnerDelimiter),
style: uiConf.GetStyle(config.STYLE_SPINNER),
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}
return &spinner
}
func (s *Spinner) Start() {
if s.IsRunning() {
return
}
atomic.StoreInt64(&s.frame, 0)
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go func() {
for {
select {
case <-s.stop:
atomic.StoreInt64(&s.frame, -1)
s.stop <- struct{}{}
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return
case <-time.After(200 * time.Millisecond):
atomic.AddInt64(&s.frame, 1)
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s.Invalidate()
}
}
}()
}
func (s *Spinner) Stop() {
if !s.IsRunning() {
return
}
s.stop <- struct{}{}
<-s.stop
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s.Invalidate()
}
func (s *Spinner) IsRunning() bool {
return atomic.LoadInt64(&s.frame) != -1
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}
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])
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}
func (s *Spinner) Invalidate() {
s.DoInvalidate(s)
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}