47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
|
|
function newEventHandler () {
|
|
let thisObject = {
|
|
name: undefined, // This is for debugging purposes only.
|
|
listenToEvent: listenToEvent,
|
|
stopListening: stopListening,
|
|
raiseEvent: raiseEvent,
|
|
finalize: finalize
|
|
}
|
|
|
|
let eventHandlers = [] // Here we store all the functions we will call when an event is raiseed.
|
|
|
|
return thisObject
|
|
|
|
function finalize () {
|
|
eventHandlers = []
|
|
}
|
|
|
|
function listenToEvent (eventType, handler, extraData) {
|
|
let eventSubscriptionId = Math.trunc(Math.random() * 1000000)
|
|
eventHandlers.push([eventType, handler, extraData, eventSubscriptionId])
|
|
return eventSubscriptionId
|
|
}
|
|
|
|
function stopListening (pEventSubscriptionId) {
|
|
for (let i = 0; i < eventHandlers.length; i++) {
|
|
if (pEventSubscriptionId === eventHandlers[i][3]) {
|
|
eventHandlers.splice(i, 1)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
function raiseEvent (eventType, event) {
|
|
for (var i = 0; i < eventHandlers.length; i++) {
|
|
/* We will execute all the functions listening to this event type. */
|
|
|
|
if (eventHandlers[i][0] === eventType) {
|
|
let handler = eventHandlers[i][1]
|
|
let extraData = eventHandlers[i][2]
|
|
|
|
handler(event, extraData)
|
|
}
|
|
}
|
|
}
|
|
}
|