betajs/betajs-browser

Scoped.define("module:Events", [
    "base:Class",
    "base:Objs",
    "base:Functions",
    "module:Dom"
], function(Class, Objs, Functions, Dom, scoped) {
    return Class.extend({
        scoped: scoped
    }, function(inherited) {
        return {

            constructor: function() {
                inherited.constructor.call(this);
                this.__callbacks = {};
            },

            destroy: function() {
                this.clear();
                inherited.destroy.call(this);
            },

            on: function(element, events, callback, context, options) {
                events.split(" ").forEach(function(event) {
                    if (!event)
                        return;
                    var callback_function = Functions.as_method(callback, context || element);
                    element.addEventListener(event, callback_function, options && Dom.passiveEventsSupported() ? options : false);
                    this.__callbacks[event] = this.__callbacks[event] || [];
                    this.__callbacks[event].push({
                        element: element,
                        callback_function: callback_function,
                        callback: callback,
                        context: context
                    });
                }, this);
                return this;
            },

            off: function(element, events, callback, context) {
                events.split(" ").forEach(function(event) {
                    if (!event)
                        return;
                    var entries = this.__callbacks[event];
                    if (entries) {
                        var i = 0;
                        while (i < entries.length) {
                            var entry = entries[i];
                            if ((!element || element === entry.element) && (!callback || callback === entry.callback) && (!context || context === entry.context)) {
                                entry.element.removeEventListener(event, entry.callback_function, false);
                                entries[i] = entries[entries.length - 1];
                                entries.pop();
                            } else


                            ++i;
                        }
                    }
                }, this);
                return this;
            },

            clear: function() {
                Objs.iter(this.__callbacks, function(entries, event) {
                    entries.forEach(function(entry) {
                        entry.element.removeEventListener(event, entry.callback_function, false);
                    });
                });
                this.__callbacks = {};
            }

        };
    });
});