94 lines
2.8 KiB
JavaScript
94 lines
2.8 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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