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h5p-php-library
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Add scopes to event system

namespaces
Svein-Tore Griff With 2015-02-11 17:31:01 +01:00
parent 079f4992b4
commit f8434bf788
1 changed files with 18 additions and 12 deletions
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30
js/event-dispatcher.js
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@ -31,21 +31,24 @@ H5P.EventDispatcher = (function () {
* @param {String} type Event type * @param {String} type Event type
* @param {Function} listener Event listener * @param {Function} listener Event listener
*/ */
self.on = function (type, listener) { self.on = function (type, listener, scope) {
if (scope === undefined) {
scope = self;
}
if (!(listener instanceof Function)) { if (!(listener instanceof Function)) {
throw TypeError('listener must be a function'); throw TypeError('listener must be a function');
} }
// Trigger event before adding to avoid recursion // Trigger event before adding to avoid recursion
self.trigger('newListener', type, listener); self.trigger('newListener', {'type': type, 'listener': listener});
if (!triggers[type]) { if (!triggers[type]) {
// First // First
triggers[type] = [listener]; triggers[type] = [{'listener': listener, 'scope': scope}];
} }
else { else {
// Append // Append
triggers[type].push(listener); triggers[type].push({'listener': listener, 'scope': scope});
} }
}; };
@ -57,17 +60,20 @@ H5P.EventDispatcher = (function () {
* @param {String} type Event type * @param {String} type Event type
* @param {Function} listener Event listener * @param {Function} listener Event listener
*/ */
self.once = function (type, listener) { self.once = function (type, listener, scope) {
if (scope === undefined) {
scope = self;
}
if (!(listener instanceof Function)) { if (!(listener instanceof Function)) {
throw TypeError('listener must be a function'); throw TypeError('listener must be a function');
} }
var once = function () { var once = function (event) {
self.off(type, once); self.off(event, once);
listener.apply(self, arguments); listener.apply(scope, event);
}; };
self.on(type, once); self.on(type, once, scope);
}; };
/** /**
@ -97,9 +103,9 @@ H5P.EventDispatcher = (function () {
// Find specific listener // Find specific listener
for (var i = 0; i < triggers[type].length; i++) { for (var i = 0; i < triggers[type].length; i++) {
if (triggers[type][i] === listener) { if (triggers[type][i].listener === listener) {
triggers[type].unshift(i, 1); triggers[type].unshift(i, 1);
self.trigger('removeListener', type, listener); self.trigger('removeListener', type, {'listener': listener});
break; break;
} }
} }
@ -132,7 +138,7 @@ H5P.EventDispatcher = (function () {
} }
// Call all listeners // Call all listeners
for (var i = 0; i < triggers[event.type].length; i++) { for (var i = 0; i < triggers[event.type].length; i++) {
triggers[event.type][i].call(self, event); triggers[event.type][i].listener.call(triggers[event.type][i].scope, event);
} }
}; };
} }