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116 lines
3.3 KiB
116 lines
3.3 KiB
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/**
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* Event listener (singleton)
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*/
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var events = {
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'listeners': [],
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/**
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* Find a single listener by its object
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* @param {Object} object
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* @return {Number} index -1 when not found
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*/
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'indexOf': function (object) {
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var listeners = this.listeners;
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for (var i = 0, iMax = this.listeners.length; i < iMax; i++) {
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var listener = listeners[i];
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if (listener && listener.object == object) {
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return i;
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}
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}
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return -1;
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},
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/**
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* Add an event listener
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* @param {Object} object
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* @param {String} event The name of an event, for example 'select'
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* @param {function} callback The callback method, called when the
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* event takes place
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*/
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'addListener': function (object, event, callback) {
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var index = this.indexOf(object);
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var listener = this.listeners[index];
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if (!listener) {
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listener = {
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'object': object,
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'events': {}
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};
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this.listeners.push(listener);
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}
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var callbacks = listener.events[event];
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if (!callbacks) {
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callbacks = [];
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listener.events[event] = callbacks;
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}
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// add the callback if it does not yet exist
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if (callbacks.indexOf(callback) == -1) {
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callbacks.push(callback);
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}
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},
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/**
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* Remove an event listener
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* @param {Object} object
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* @param {String} event The name of an event, for example 'select'
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* @param {function} callback The registered callback method
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*/
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'removeListener': function (object, event, callback) {
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var index = this.indexOf(object);
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var listener = this.listeners[index];
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if (listener) {
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var callbacks = listener.events[event];
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if (callbacks) {
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index = callbacks.indexOf(callback);
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if (index != -1) {
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callbacks.splice(index, 1);
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}
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// remove the array when empty
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if (callbacks.length == 0) {
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delete listener.events[event];
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}
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}
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// count the number of registered events. remove listener when empty
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var count = 0;
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var events = listener.events;
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for (var e in events) {
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if (events.hasOwnProperty(e)) {
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count++;
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}
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}
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if (count == 0) {
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delete this.listeners[index];
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}
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}
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},
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/**
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* Remove all registered event listeners
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*/
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'removeAllListeners': function () {
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this.listeners = [];
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},
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/**
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* Trigger an event. All registered event handlers will be called
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* @param {Object} object
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* @param {String} event
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* @param {Object} properties (optional)
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*/
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'trigger': function (object, event, properties) {
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var index = this.indexOf(object);
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var listener = this.listeners[index];
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if (listener) {
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var callbacks = listener.events[event];
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if (callbacks) {
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for (var i = 0, iMax = callbacks.length; i < iMax; i++) {
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callbacks[i](properties);
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}
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}
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}
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}
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};
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