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Added an event dispatcher filtering mechanism #7

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211 changes: 114 additions & 97 deletions src/EventBus.js
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Original file line number Diff line number Diff line change
@@ -1,100 +1,117 @@
(function (root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if(typeof define === 'function' && define.amd)
define("EventBus", [], factory);
else if(typeof exports === 'object')
exports["EventBus"] = factory();
else
root["EventBus"] = factory();
})(this, function() {
if (typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if (typeof define === 'function' && define.amd)
define("EventBus", [], factory);
else if (typeof exports === 'object')
exports["EventBus"] = factory();
else
root["EventBus"] = factory();
})(this, function () {

var EventBusClass = {};
EventBusClass = function() {
this.listeners = {};
};
EventBusClass.prototype = {
addEventListener:function(type, callback, scope) {
var args = [];
var numOfArgs = arguments.length;
for(var i=0; i<numOfArgs; i++){
args.push(arguments[i]);
}
args = args.length > 3 ? args.splice(3, args.length-1) : [];
if(typeof this.listeners[type] != "undefined") {
this.listeners[type].push({scope:scope, callback:callback, args:args});
} else {
this.listeners[type] = [{scope:scope, callback:callback, args:args}];
}
},
removeEventListener:function(type, callback, scope) {
if(typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
var newArray = [];
for(var i=0; i<numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if(listener.scope == scope && listener.callback == callback) {

} else {
newArray.push(listener);
}
}
this.listeners[type] = newArray;
}
},
hasEventListener:function(type, callback, scope) {
if(typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
if(callback === undefined && scope === undefined){
return numOfCallbacks > 0;
}
for(var i=0; i<numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if((scope ? listener.scope == scope : true) && listener.callback == callback) {
return true;
}
}
}
return false;
},
dispatch:function(type, target) {
var numOfListeners = 0;
var event = {
type:type,
target:target
};
var args = [];
var numOfArgs = arguments.length;
for(var i=0; i<numOfArgs; i++){
args.push(arguments[i]);
};
args = args.length > 2 ? args.splice(2, args.length-1) : [];
args = [event].concat(args);
if(typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
for(var i=0; i<numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if(listener && listener.callback) {
var concatArgs = args.concat(listener.args);
listener.callback.apply(listener.scope, concatArgs);
numOfListeners += 1;
}
}
}
},
getEvents:function() {
var str = "";
for(var type in this.listeners) {
var numOfCallbacks = this.listeners[type].length;
for(var i=0; i<numOfCallbacks; i++) {
var listener = this.listeners[type][i];
str += listener.scope && listener.scope.className ? listener.scope.className : "anonymous";
str += " listen for '" + type + "'\n";
}
}
return str;
}
};
var EventBus = new EventBusClass();
return EventBus;
//noinspection JSUnusedAssignment
var EventBusClass = {};
EventBusClass = function () {
this.listeners = {};
};
EventBusClass.prototype = {
addEventListener: function (type, callback, scope) {
var args = [];
var numOfArgs = arguments.length;
for (var i = 0; i < numOfArgs; i++) {
args.push(arguments[i]);
}
args = args.length > 3 ? args.splice(3, args.length - 1) : [];
if (typeof this.listeners[type] != "undefined") {
this.listeners[type].push({scope: scope, callback: callback, args: args});
} else {
this.listeners[type] = [{scope: scope, callback: callback, args: args}];
}
},
removeEventListener: function (type, callback, scope) {
if (typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
var newArray = [];
for (var i = 0; i < numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if (listener.scope == scope && listener.callback == callback) {

} else {
newArray.push(listener);
}
}
this.listeners[type] = newArray;
}
},
hasEventListener: function (type, callback, scope) {
if (typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
if (callback === undefined && scope === undefined) {
return numOfCallbacks > 0;
}
for (var i = 0; i < numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if ((scope ? listener.scope == scope : true) && listener.callback == callback) {
return true;
}
}
}
return false;
},
dispatch: function (type, target) {
var numOfListeners = 0;
var event = {
type: type,
target: target
};
var args = [];
var numOfArgs = arguments.length;
var i;
for (i = 0; i < numOfArgs; i++) {
args.push(arguments[i]);
}
args = args.length > 2 ? args.splice(2, args.length - 1) : [];
args = [event].concat(args);
if (typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
for (i = 0; i < numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if (listener && listener.callback) {
var concatArgs = args.concat(listener.args);
listener.callback.apply(listener.scope, concatArgs);
numOfListeners += 1;
}
}
}
},
filter: function (type, target, value, params) {
var numOfListeners = 0;
if (typeof this.listeners[type] != "undefined") {
var numOfCallbacks = this.listeners[type].length;
for (var i = 0; i < numOfCallbacks; i++) {
var listener = this.listeners[type][i];
if (listener && listener.callback) {
value = listener.callback.apply(listener.scope, [value, params]);
numOfListeners += 1;
}
}
}
return value;
},
getEvents: function () {
var str = "";
for (var type in this.listeners) {
if (this.listeners.hasOwnProperty(type)) {
var numOfCallbacks = this.listeners[type].length;
for (var i = 0; i < numOfCallbacks; i++) {
var listener = this.listeners[type][i];
str += listener.scope && listener.scope.className ? listener.scope.className : "anonymous";
str += " listen for '" + type + "'\n";
}
}
}
return str;
}
};
return new EventBusClass();
});