easy-magix/src/tmpl/event.js

view manager framewrok

/**
 * 多播事件对象
 * @name Event
 * @namespace
 */
var Event_ON = 'on';
var Event = {
    /**
     * @lends Event
     */
    /**
     * 触发事件
     * @param {String} name 事件名称
     * @param {Object} data 事件对象
     * @param {Boolean} [remove] 事件触发完成后是否移除这个事件的所有监听
     * @param {Boolean} [lastToFirst] 是否从后向前触发事件的监听列表
     */
    fire: function (name, data, remove, lastToFirst) {
        var key = G_SPLITER + name,
            me = this,
            list = me[key],
            end, len, idx, t;
        if (!data) data = {};
        if (!data.type) data.type = name;
        if (list) {
            end = list.length;
            len = end - 1;
            while (end--) {
                idx = lastToFirst ? end : len - end;
                t = list[idx];
                if (t.f) {
                    t.x = 1;
                    G_ToTry(t.f, data, me);
                    t.x = G_EMPTY;
                } else if (!t.x) {
                    list.splice(idx, 1);
                    len--;
                }
            }
        }
        list = me[Event_ON + name];
        if (list) G_ToTry(list, data, me);
        if (remove) me.off(name);
    },
    /**
     * 绑定事件
     * @param {String} name 事件名称
     * @param {Function} fn 事件处理函数
     * @example
     * var T = Magix.mix({},Magix.Event);
     * T.on('done',function(e){
     *     alert(1);
     * });
     * T.on('done',function(e){
     *     alert(2);
     *     T.off('done',arguments.callee);
     * });

     * T.fire('done',{data:'test'});
     * T.fire('done',{data:'test2'});
     */
    on: function (name, fn) {
        var me = this;
        var key = G_SPLITER + name;
        var list = me[key] || (me[key] = []);
        list.push({
            f: fn
        });
    },
    /**
     * 解除事件绑定
     * @param {String} name 事件名称
     * @param {Function} [fn] 事件处理函数
     */
    off: function (name, fn) {
        var key = G_SPLITER + name,
            me = this,
            list = me[key],
            i, t;
        if (fn) {
            if (list) {
                i = list.length;
                while (i--) {
                    t = list[i];
                    if (t.f == fn) {
                        t.f = G_EMPTY;
                        break;
                    }
                }
            }
        } else {
            delete me[key];
            delete me[Event_ON + name];
        }
    }
};
Magix.Event = Event;