event.lua
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local Event = class("Event")
local EXPORTED_METHODS = {
"addEventListener",
"dispatchEvent",
"removeEventListener",
"removeEventListenersByTag",
"removeEventListenersByEvent",
"removeAllEventListeners",
"hasEventListener",
"dumpAllEventListeners",
}
function Event:init_()
self.target_ = nil
self.listeners_ = {}
self.nextListenerHandleIndex_ = 0
end
function Event:bind(target)
self:init_()
cc.setmethods(target, self, EXPORTED_METHODS)
self.target_ = target
end
function Event:unbind(target)
cc.unsetmethods(target, EXPORTED_METHODS)
self:init_()
end
function Event:on(eventName, listener, tag)
assert(type(eventName) == "string" and eventName ~= "",
"Event:addEventListener() - invalid eventName")
eventName = string.upper(eventName)
if self.listeners_[eventName] == nil then
self.listeners_[eventName] = {}
end
self.nextListenerHandleIndex_ = self.nextListenerHandleIndex_ + 1
local handle = tostring(self.nextListenerHandleIndex_)
tag = tag or ""
self.listeners_[eventName][handle] = {listener, tag}
if DEBUG > 1 then
printInfo("%s [Event] addEventListener() - event: %s, handle: %s, tag: \"%s\"",
tostring(self.target_), eventName, handle, tostring(tag))
end
return self.target_, handle
end
Event.addEventListener = Event.on
function Event:dispatchEvent(event)
event.name = string.upper(tostring(event.name))
local eventName = event.name
if DEBUG > 1 then
printInfo("%s [Event] dispatchEvent() - event %s", tostring(self.target_), eventName)
end
if self.listeners_[eventName] == nil then return end
event.target = self.target_
event.stop_ = false
event.stop = function(self)
self.stop_ = true
end
for handle, listener in pairs(self.listeners_[eventName]) do
if DEBUG > 1 then
printInfo("%s [Event] dispatchEvent() - dispatching event %s to listener %s", tostring(self.target_), eventName, handle)
end
-- listener[1] = listener
-- listener[2] = tag
event.tag = listener[2]
listener[1](event)
if event.stop_ then
if DEBUG > 1 then
printInfo("%s [Event] dispatchEvent() - break dispatching for event %s", tostring(self.target_), eventName)
end
break
end
end
return self.target_
end
function Event:removeEventListener(handleToRemove)
for eventName, listenersForEvent in pairs(self.listeners_) do
for handle, _ in pairs(listenersForEvent) do
if handle == handleToRemove then
listenersForEvent[handle] = nil
if DEBUG > 1 then
printInfo("%s [Event] removeEventListener() - remove listener [%s] for event %s", tostring(self.target_), handle, eventName)
end
return self.target_
end
end
end
return self.target_
end
function Event:removeEventListenersByTag(tagToRemove)
for eventName, listenersForEvent in pairs(self.listeners_) do
for handle, listener in pairs(listenersForEvent) do
-- listener[1] = listener
-- listener[2] = tag
if listener[2] == tagToRemove then
listenersForEvent[handle] = nil
if DEBUG > 1 then
printInfo("%s [Event] removeEventListener() - remove listener [%s] for event %s", tostring(self.target_), handle, eventName)
end
end
end
end
return self.target_
end
function Event:removeEventListenersByEvent(eventName)
self.listeners_[string.upper(eventName)] = nil
if DEBUG > 1 then
printInfo("%s [Event] removeAllEventListenersForEvent() - remove all listeners for event %s", tostring(self.target_), eventName)
end
return self.target_
end
function Event:removeAllEventListeners()
self.listeners_ = {}
if DEBUG > 1 then
printInfo("%s [Event] removeAllEventListeners() - remove all listeners", tostring(self.target_))
end
return self.target_
end
function Event:hasEventListener(eventName)
eventName = string.upper(tostring(eventName))
local t = self.listeners_[eventName]
for _, __ in pairs(t) do
return true
end
return false
end
function Event:dumpAllEventListeners()
print("---- Event:dumpAllEventListeners() ----")
for name, listeners in pairs(self.listeners_) do
printf("-- event: %s", name)
for handle, listener in pairs(listeners) do
printf("-- listener: %s, handle: %s", tostring(listener[1]), tostring(handle))
end
end
return self.target_
end
return Event