75 lines
No EOL
1.8 KiB
Text
75 lines
No EOL
1.8 KiB
Text
import "math/util" for Util
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//my own event class because Events does too much with its tags and too little with disposing
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class Event{
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construct new(){
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_listeners = {}
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_listenersOnce = {}
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_index = -1
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}
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listen(fn){
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_index = _index + 1
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_listeners[_index] = fn
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return ListenerToken.new(this, _index)
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}
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listenOnce(fn){
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_index = _index + 1
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_listenersOnce[_index] = fn
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return ListenerToken.new(this, _index)
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}
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unlisten(id){
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if(id is Num) {
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var removed = false
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removed = removed || _listeners.remove(id)
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removed = removed || _listenersOnce.remove(id)
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if(!removed){
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System.print("[warn] tried to remove unknown listener id")
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}
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} else if(id is Fn){
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var removed = false
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System.print(_listeners.keys)
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for(index in _listeners.keys){
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if(_listeners[index] == id){
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//! this might lead to problems because I'm modifying the thing I'm iterating over
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//in that case we need to defer the removal
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_listeners.remove(index)
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removed = true
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}
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}
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if(!removed){
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System.print("[warn] tried to remove unknown listener fn")
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}
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} else if(id is ListenerToken) {
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id.discard()
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} else {
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System.print("[warn] how is a %(id.type.name) related to the listener? pass the listener index or function.")
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}
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}
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emit(arguments){
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_listeners.each{|val|
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Util.call_arg_list(val.value, arguments)
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}
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_listenersOnce.each{|val|
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Util.call_arg_list(val.value, arguments)
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}
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_listenersOnce.clear()
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}
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}
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class ListenerToken{
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event{_event}
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index{_index}
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construct new(event, index){
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_event = event
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_index = index
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}
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discard(){
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event.unlisten(index)
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}
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} |