Function delegateFn

examples/hello-mui/js/mui.js:597–649

(element, event, selector, callback)

	var delegateFns = {};
	//返回事件委托的wrap事件回调
	var delegateFn = function(element, event, selector, callback) {
		return function(e) {
			//same event
			var callbackObjs = delegates[element._mid][event];
			var handlerQueue = [];
			var target = e.target;
			var selectorAlls = {};
			for (; target && target !== document; target = target.parentNode) {
				if (target === element) {
					break;
				}
				if (~['click', 'tap', 'doubletap', 'longtap', 'hold'].indexOf(event) && (target.disabled || target.classList.contains('mui-disabled'))) {
					break;
				}
				var matches = {};
				$.each(callbackObjs, function(selector, callbacks) { //same selector
					selectorAlls[selector] || (selectorAlls[selector] = $.qsa(selector, element));
					if (selectorAlls[selector] && ~(selectorAlls[selector]).indexOf(target)) {
						if (!matches[selector]) {
							matches[selector] = callbacks;
						}
					}
				}, true);
				if (!$.isEmptyObject(matches)) {
					handlerQueue.push({
						element: target,
						handlers: matches
					});
				}
			}
			selectorAlls = null;
			e = compatible(e); //compatible event
			$.each(handlerQueue, function(index, handler) {
				target = handler.element;
				var tagName = target.tagName;
				if (event === 'tap' && (tagName !== 'INPUT' && tagName !== 'TEXTAREA' && tagName !== 'SELECT')) {
					e.preventDefault();
					e.detail && e.detail.gesture && e.detail.gesture.preventDefault();
				}
				$.each(handler.handlers, function(index, handler) {
					$.each(handler, function(index, callback) {
						if (callback.call(target, e) === false) {
							e.preventDefault();
							e.stopPropagation();
						}
					}, true);
				}, true)
				if (e.isPropagationStopped()) {
					return false;
				}
			}, true);
		};
	};
	var findDelegateFn = function(element, event) {
		var delegateCallbacks = delegateFns[mid(element)];
		var result = [];