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* 事件对象绑定，将events中包含的键值对映射为代理的事件。
* - 事件键值对格式可以为：
* - {'selector event':'method'}
* - {'event':'method'}
* - {'selector event':'method1 method2'}
* - {'event':'method1 method2'}
* @method mvc/delegate
* @param {Boolean} action 开/关代理，可选：['on', 'off']。
* @param {Object} root 设置代理的根节点，可以是一个jquery对象，或者是混合了 spore-kit/packages/evt/events 方法的对象。
* @param {Object} events 事件键值对
* @param {Object} bind 指定事件函数绑定的对象，必须为MVC类的实例。
*/
var $assign = require('../obj/assign');
var $type = require('../obj/type');
function delegate(action, root, events, bind) {
var proxy;
var dlg;
if (!root) {
return;
}
if (!bind || $type(bind.proxy) !== 'function') {
return;
}
proxy = bind.proxy();
action = action === 'on' ? 'on' : 'off';
dlg = action === 'on' ? 'delegate' : 'undelegate';
events = $assign({}, events);
Object.keys(events).forEach(function (handle) {
var method = events[handle];
var selector;
var event;
var fns = [];
handle = handle.split(/\s+/);
if (typeof method === 'string') {
fns = method.split(/\s+/).map(function (fname) {
return proxy(fname);
});
} else if ($type(method) === 'function') {
fns = [method];
} else {
return;
}
event = handle.pop();
if (handle.length >= 1) {
selector = handle.join(' ');
Eif ($type(root[dlg]) === 'function') {
fns.forEach(function (fn) {
root[dlg](selector, event, fn);
});
}
} else Eif ($type(root[action]) === 'function') {
fns.forEach(function (fn) {
root[action](event, fn);
});
}
});
}
module.exports = delegate;
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