73 lines
2.5 KiB
JavaScript
73 lines
2.5 KiB
JavaScript
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function newEventHandler () {
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const CONSOLE_LOG = false
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let thisObject = {
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name: undefined, // This is for debugging purposes only.
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parentEventHandler: undefined, // Here we store the parent cointainer zoom object.
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listenToEvent: listenToEvent,
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stopListening: stopListening,
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raiseEvent: raiseEvent,
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initialize: initialize
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}
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var eventHandlers = [] // Here we store all the functions we will call when an event is comming.
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return thisObject
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function initialize () {
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}
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function listenToEvent (eventType, handler, extraData) {
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eventHandlers.push([eventType, handler, extraData])
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if (thisObject.name !== undefined && CONSOLE_LOG === true) {
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console.log('Event Handler named ' + thisObject.name + ' received a request to listenToEvent ' + eventType + ' and call ' + (handler.toString()).substring(0, 50))
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}
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}
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function stopListening (pEventType, pHandler) {
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if (thisObject.name !== undefined && CONSOLE_LOG === true) {
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console.log('Event Handler named ' + thisObject.name + ' received a request to stop listening to an the event ' + pEventType + ' with this handler: ' + pHandler)
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}
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for (let i = 0; i < eventHandlers.length; i++) {
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let record = eventHandlers[i]
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let eventType = record[0]
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let handler = record[1]
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if (pEventType === eventType && pHandler.toString() === handler.toString()) {
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eventHandlers.splice(i, 1)
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if (thisObject.name !== undefined && CONSOLE_LOG === true) {
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console.log('Evethandler found and deleted.')
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}
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return
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}
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}
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}
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function raiseEvent (eventType, event) {
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if (thisObject.name !== undefined && CONSOLE_LOG === true) {
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console.log('Event Handler named ' + thisObject.name + ' received a request to raiseEvent ' + eventType + ' with this data ' + (event.toString()).substring(0, 50))
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}
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for (var i = 0; i < eventHandlers.length; i++) {
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/* We will execute all the functions listening to this event type. */
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if (eventHandlers[i][0] === eventType) {
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var handler = eventHandlers[i][1]
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var extraData = eventHandlers[i][2]
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if (thisObject.name !== undefined && CONSOLE_LOG === true) {
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console.log('Event Handler named ' + thisObject.name + ' received a request to raiseEvent ' + eventType + ' and will call this handler: ' + (handler.toString()).substring(0, 50))
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}
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handler(event, extraData)
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}
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}
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}
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}
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