34 lines
651 B
Go
34 lines
651 B
Go
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package tins2020
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func NewEvents() *Events {
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return &Events{events: map[int]EventInterfaceFn{}}
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}
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type Events struct {
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nextID int
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events map[int]EventInterfaceFn
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}
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type EventHandler interface {
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Register(EventFn) int
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RegisterItf(EventInterfaceFn) int
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Unregister(int)
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}
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func (h *Events) Notify(state interface{}) {
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for _, event := range h.events {
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event(state)
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}
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}
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func (h *Events) Register(fn EventFn) int { return h.RegisterItf(func(interface{}) { fn() }) }
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func (h *Events) RegisterItf(fn EventInterfaceFn) int {
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id := h.nextID
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h.nextID++
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h.events[id] = fn
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return id
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}
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func (h *Events) Unregister(id int) { delete(h.events, id) }
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