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Diffstat (limited to 'widgets/spinner.go')
-rw-r--r--widgets/spinner.go80
1 files changed, 80 insertions, 0 deletions
diff --git a/widgets/spinner.go b/widgets/spinner.go
new file mode 100644
index 0000000..2e7e367
--- /dev/null
+++ b/widgets/spinner.go
@@ -0,0 +1,80 @@
+package widgets
+
+import (
+ "time"
+
+ "github.com/gdamore/tcell"
+
+ "git.sr.ht/~sircmpwn/aerc2/lib/ui"
+)
+
+var (
+ frames = []string{
+ "[..] ",
+ " [..] ",
+ " [..] ",
+ " [..] ",
+ " [..]",
+ " [..] ",
+ " [..] ",
+ " [..] ",
+ }
+)
+
+type Spinner struct {
+ frame int
+ onInvalidate func(d ui.Drawable)
+ stop chan interface{}
+}
+
+func NewSpinner() *Spinner {
+ spinner := Spinner{
+ stop: make(chan interface{}),
+ frame: -1,
+ }
+ return &spinner
+}
+
+func (s *Spinner) Start() {
+ s.frame = 0
+ go func() {
+ for {
+ select {
+ case <-s.stop:
+ return
+ case <-time.After(200 * time.Millisecond):
+ s.frame++
+ if s.frame >= len(frames) {
+ s.frame = 0
+ }
+ s.Invalidate()
+ }
+ }
+ }()
+}
+
+func (s *Spinner) Stop() {
+ s.stop <- nil
+ s.frame = -1
+ s.Invalidate()
+}
+
+func (s *Spinner) IsRunning() bool {
+ return s.frame != -1
+}
+
+func (s *Spinner) Draw(ctx *ui.Context) {
+ ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
+ col := ctx.Width()/2 - len(frames[0])/2 + 1
+ ctx.Printf(col, 0, tcell.StyleDefault, "%s", frames[s.frame])
+}
+
+func (s *Spinner) OnInvalidate(onInvalidate func(d ui.Drawable)) {
+ s.onInvalidate = onInvalidate
+}
+
+func (s *Spinner) Invalidate() {
+ if s.onInvalidate != nil {
+ s.onInvalidate(s)
+ }
+}