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keyboardRepeater.go
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/
keyboardRepeater.go
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package main
import "github.com/eiannone/keyboard"
type KeyboardRepeater struct {
origin <-chan keyboard.KeyEvent
subscribers []chan keyboard.KeyEvent
}
func (receiver *KeyboardRepeater) Subscribe() <-chan keyboard.KeyEvent {
ch := make(chan keyboard.KeyEvent)
receiver.subscribers = append(receiver.subscribers, ch)
return ch
}
func (receiver *KeyboardRepeater) Unsubscribe(chanel <-chan keyboard.KeyEvent) {
newSubscribers := make([]chan keyboard.KeyEvent, 0, maxInt(len(receiver.subscribers)-1, 1))
for idx, candidate := range receiver.subscribers {
if candidate == chanel {
newSubscribers = append(newSubscribers, receiver.subscribers[:idx]...)
newSubscribers = append(newSubscribers, receiver.subscribers[idx+1:]...)
close(candidate)
}
}
receiver.subscribers = newSubscribers
}
func NewKeyboardRepeater(origin <-chan keyboard.KeyEvent) (*KeyboardRepeater, error) {
instance := &KeyboardRepeater{
origin: origin,
subscribers: make([]chan keyboard.KeyEvent, 0, 1),
}
go repeatDispatcher(instance)
return instance, nil
}
func repeatDispatcher(repeater *KeyboardRepeater) {
for {
select {
case key, ok := <-repeater.origin:
for _, subscriber := range repeater.subscribers {
if !ok {
close(subscriber)
} else {
subscriber <- key
}
}
if !ok {
return
}
}
}
}