1 var STATE_POSSIBLE = 1;
2 var STATE_BEGAN = 2;
3 var STATE_CHANGED = 4;
4 var STATE_ENDED = 8;
5 var STATE_RECOGNIZED = STATE_ENDED;
6 var STATE_CANCELLED = 16;
7 var STATE_FAILED = 32;

 1 var TOUCH_ACTION_COMPUTE = 'compute';
 2 var TOUCH_ACTION_AUTO = 'auto';
 3 var TOUCH_ACTION_MANIPULATION = 'manipulation'; // not implemented
 4 var TOUCH_ACTION_NONE = 'none';
 5 var TOUCH_ACTION_PAN_X = 'pan-x';
 6 var TOUCH_ACTION_PAN_Y = 'pan-y';
 7
 8 getTouchAction: function() {
 9     return [TOUCH_ACTION_MANIPULATION];
10 }

1 reset: function() {
2     clearTimeout(this._timer);
3 }

tap.recognizeWith(new Hammer.Rotate());

 1 /**
 2  * @param {Recognizer|Array|String} otherRecognizer
 3  * @returns {Recognizer} this
 4  */
 5 recognizeWith: function(otherRecognizer) {
 6   //支持一个识别器组成的数组来作为参数
 7   if (invokeArrayArg(otherRecognizer, 'recognizeWith', this)) {
 8     return this;
 9   }
10
11   var simultaneous = this.simultaneous;
12   //如果识别器被添加到了Manager上，也支持将其它识别器(otherRecognizer)的事件名（字符串形式）来作为参数
13   otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
14   if (!simultaneous[otherRecognizer.id]) {
15     //保存到 simultaneous 数组中
16     simultaneous[otherRecognizer.id] = otherRecognizer;
17     otherRecognizer.recognizeWith(this);//调用otherRecognizer的方法
18   }
19   return this;
20 }

1 canRecognizeWith: function(otherRecognizer) {
2   return !!this.simultaneous[otherRecognizer.id];
3 }

 1 /**
 2  * @param {Recognizer|Array|String} otherRecognizer
 3  * @returns {Recognizer} this
 4  */
 5 requireFailure: function(otherRecognizer) {
 6   if (invokeArrayArg(otherRecognizer, 'requireFailure', this)) {
 7     return this;
 8   }
 9
10   var requireFail = this.requireFail;
11   otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
12   if (inArray(requireFail, otherRecognizer) === -1) {
13     requireFail.push(otherRecognizer);//维护一个requireFail数组
14     otherRecognizer.requireFailure(this);
15   }
16   return this;
17 }

tryEmit: function(input) {if (this.canEmit()) {return this.emit(input);}// it's failing anywaythis.state = STATE_FAILED;},canEmit: function() {var i = 0;while (i < this.requireFail.length) {if (!(this.requireFail[i].state & (STATE_FAILED | STATE_POSSIBLE))) {return false;}i++;}return true;}