90 lines
1.3 KiB
Go
90 lines
1.3 KiB
Go
package widgets
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import (
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"sync/atomic"
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"time"
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"github.com/gdamore/tcell"
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"git.sr.ht/~sircmpwn/aerc/lib/ui"
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)
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var (
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frames = []string{
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"[..] ",
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" [..] ",
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" [..] ",
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" [..] ",
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" [..]",
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" [..] ",
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" [..] ",
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" [..] ",
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}
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)
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type Spinner struct {
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ui.Invalidatable
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frame int64 // access via atomic
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stop chan struct{}
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}
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func NewSpinner() *Spinner {
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spinner := Spinner{
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stop: make(chan struct{}),
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frame: -1,
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}
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return &spinner
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}
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func (s *Spinner) Start() {
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if s.IsRunning() {
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return
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}
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atomic.StoreInt64(&s.frame, 0)
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go func() {
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for {
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select {
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case <-s.stop:
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atomic.StoreInt64(&s.frame, -1)
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s.stop <- struct{}{}
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return
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case <-time.After(200 * time.Millisecond):
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atomic.AddInt64(&s.frame, 1)
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s.Invalidate()
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}
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}
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}()
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}
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func (s *Spinner) Stop() {
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if !s.IsRunning() {
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return
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}
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s.stop <- struct{}{}
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<-s.stop
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s.Invalidate()
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}
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func (s *Spinner) IsRunning() bool {
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return atomic.LoadInt64(&s.frame) != -1
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}
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func (s *Spinner) Draw(ctx *ui.Context) {
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if !s.IsRunning() {
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s.Start()
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}
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cur := int(atomic.LoadInt64(&s.frame) % int64(len(frames)))
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ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
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col := ctx.Width()/2 - len(frames[0])/2 + 1
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ctx.Printf(col, 0, tcell.StyleDefault, "%s", frames[cur])
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}
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func (s *Spinner) Invalidate() {
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s.DoInvalidate(s)
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}
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