scratch – Rev 117
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/*=========================
Events/Callbacks/Plugins Emitter
===========================*/
function normalizeEventName (eventName) {
if (eventName.indexOf('on') !== 0) {
if (eventName[0] !== eventName[0].toUpperCase()) {
eventName = 'on' + eventName[0].toUpperCase() + eventName.substring(1);
}
else {
eventName = 'on' + eventName;
}
}
return eventName;
}
s.emitterEventListeners = {
};
s.emit = function (eventName) {
// Trigger callbacks
if (s.params[eventName]) {
s.params[eventName](arguments[1], arguments[2], arguments[3], arguments[4], arguments[5]);
}
var i;
// Trigger events
if (s.emitterEventListeners[eventName]) {
for (i = 0; i < s.emitterEventListeners[eventName].length; i++) {
s.emitterEventListeners[eventName][i](arguments[1], arguments[2], arguments[3], arguments[4], arguments[5]);
}
}
// Trigger plugins
if (s.callPlugins) s.callPlugins(eventName, arguments[1], arguments[2], arguments[3], arguments[4], arguments[5]);
};
s.on = function (eventName, handler) {
eventName = normalizeEventName(eventName);
if (!s.emitterEventListeners[eventName]) s.emitterEventListeners[eventName] = [];
s.emitterEventListeners[eventName].push(handler);
return s;
};
s.off = function (eventName, handler) {
var i;
eventName = normalizeEventName(eventName);
if (typeof handler === 'undefined') {
// Remove all handlers for such event
s.emitterEventListeners[eventName] = [];
return s;
}
if (!s.emitterEventListeners[eventName] || s.emitterEventListeners[eventName].length === 0) return;
for (i = 0; i < s.emitterEventListeners[eventName].length; i++) {
if(s.emitterEventListeners[eventName][i] === handler) s.emitterEventListeners[eventName].splice(i, 1);
}
return s;
};
s.once = function (eventName, handler) {
eventName = normalizeEventName(eventName);
var _handler = function () {
handler(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4]);
s.off(eventName, _handler);
};
s.on(eventName, _handler);
return s;
};