ofio.events.js

define(['ofio/ofio'], function (Ofio) {
    var listeners_by_id = {};
    var id = 0;

    var class_on = function (event, listener) {
        var listeners;
        if (!this.listeners[event])
            listeners = this.listeners[event] = {};
        else
            listeners = this.listeners[event];

        listeners[id] = listener;
        listeners_by_id[id] = listeners;

        return id++;
    };


    //todo: parents
    var class_emit = function (event) {
        var listeners = this.listeners[ event ];
        if (!listeners) return;

        var args = Array.prototype.slice.call(arguments, 1);

        for (var id in listeners) {
            listeners[ id ].apply(this, args);
        }
    };


    var on_include = function (clazz) {
        clazz.listeners = {};
        clazz.on = class_on;
        clazz.emit = class_emit;
    };

    //todo: remove listener for classes
    var module = new Ofio.Module({
        name: 'ofio.events',
        onInclude: on_include
    });

    module.init = function () {
        this.__listeners = {};
    };


    module.on = function (event, listener) {
        var listeners;

        if (typeof listener != "function")
            throw new Error('Second argument must be a function');

        if (!this.__listeners[event])
            listeners = this.__listeners[event] = {};
        else
            listeners = this.__listeners[event];

        listeners[ id ] = listener;
        listeners_by_id[ id ] = listeners;

        return id++;
    };


    module.emit = function (event) {
        var args = Array.prototype.slice.call(arguments, 1);

        var listeners = this.__listeners[event];
        for (var id in listeners) {
            listeners[id].apply(this, args);
        }

        args.unshift(event, this);

        var parent = this;
        while (parent) {
            if (!parent.emit) break;
            parent.constructor.emit.apply(parent.constructor, args);
            parent = parent.parent;
        }
    };


    module.remove_listener = function (id) {
        var listeners = listeners_by_id[ id ];
        if (!listeners) return false;

        delete listeners[ id ];
    };

    return module;
});