0.6.x/js/ui/05_XUI_Gesture.js

   1 /* original:\r
   2  *  Hammer.JS - v1.0.5 - 2013-04-07\r
   3  *  http://eightmedia.github.com/hammer.js\r
   4  *  Jorik Tangelder <j.tangelder@gmail.com>, MIT license\r
   5  **/\r
   6 \r
   7 X.UI = X.UI || {};\r
   8 \r
   9 ( function( Math, window, document, undefined ){\r
  10         \r
  11         var ELEENT_LIST = [],\r
  12                 HAMMER_LIST = [],\r
  13                 POINTERS    = [],\r
  14                 ABS = new Function( 'v', 'return v<0?-v:v' );\r
  15         \r
  16         X.UI.Gesture = Hammer;\r
  17         \r
  18         function Hammer( uinodeRoot, uinode, type ){\r
  19                 this.uinode  = uinode;\r
  20                 this.enabled = true;\r
  21                 \r
  22                 Hammer.startup && Hammer.startup( uinodeRoot );\r
  23 \r
  24                 this.options = Hammer.defaults;\r
  25 \r
  26                 // start detection on touchstart\r
  27                 Utils.addEvents( uinode, Hammer.EVENT_TYPES_START, this );\r
  28                 \r
  29                 this.listen( type );\r
  30         };\r
  31         \r
  32         Hammer.defaults = {};\r
  33         \r
  34         Hammer.prototype.handleEvent = function( e ){\r
  35                 //var sourceEventType = e.type.toLowerCase();\r
  36 \r
  37                 var type       = IdToGestureID[ e.type ],\r
  38                         gestures   = Detection.gestures,\r
  39                         numTouches = 0,// count the total touches on the screen\r
  40                         pointerType, i, l, touches, ret, active, gesture, startEv,\r
  41                         deltaTime, deltaX, deltaY, velocity;\r
  42                 console.log( '1 : ' + type + ' .............. ' + e.type )\r
  43                 if( !type ) return;\r
  44                 \r
  45                 if( e.pointerType ){\r
  46                         type |= POINTER;\r
  47                         switch( e.pointerType ){\r
  48                                 case 'touch' :\r
  49                                 case e.MSPOINTER_TYPE_TOUCH :\r
  50                                         type |= TOUCH; break;\r
  51                                 case 'pen' :\r
  52                                 case e.MSPOINTER_TYPE_PEN :\r
  53                                         type |= PEN; break;\r
  54                                 case 'mouse' :\r
  55                                 case e.MSPOINTER_TYPE_MOUSE :\r
  56                                         type |= MOUSE; break;\r
  57                                 default :\r
  58                                         return;\r
  59                         };\r
  60                 } else\r
  61                 if( e.touches ){\r
  62                         type |= TOUCH;\r
  63                 } else {\r
  64                         type |= MOUSE;\r
  65                 };\r
  66                 \r
  67                 // onmouseup, but when touchend has been fired we do nothing.\r
  68                 // this is for touchdevices which also fire a mouseup on touchend\r
  69                 if( type & MOUSE && touch_triggered ){\r
  70                         return X.Callback.STOP_NOW | X.Callback.STOP_PROPAGATION | X.Callback.PREVENT_DEFAULT;\r
  71                 }\r
  72                 // mousebutton must be down or a touch event\r
  73                 else if (\r
  74                         type & TOUCH || //sourceEventType.match(/touch/) || // touch events are always on screen\r
  75                         ( type & POINTER && type & START ) || //sourceEventType.match(/pointerdown/) || // pointerevents touch\r
  76                         ( type & MOUSE   && e.which === 1 ) //(sourceEventType.match(/mouse/) && e.which === 1) // mouse is pressed\r
  77                 ){\r
  78                         enable_detect = true;\r
  79                 };\r
  80 \r
  81                 // we are in a touch event, set the touch triggered bool to true,\r
  82                 // this for the conflicts that may occur on ios and android\r
  83                 type & ( TOUCH | POINTER ) && ( touch_triggered = true );\r
  84                 //if (sourceEventType.match(/touch|pointer/)) { touch_triggered = true;}\r
  85 \r
  86                 // when touch has been triggered in this detection session\r
  87                 // and we are now handling a mouse event, we stop that to prevent conflicts\r
  88                 if( enable_detect ){\r
  89                         // update pointerevent\r
  90                         if( Hammer.HAS_POINTEREVENTS ){ //eventType !== Hammer.EVENT_END ){\r
  91                                 POINTERS[ e.identifier = e.pointerId ] = type & END ? null : e;\r
  92                                 touches = [];\r
  93                                 // we can use forEach since pointerEvents only is in IE10\r
  94                                 for( i = 0, l = POINTERS.length; i < l; ++i ){\r
  95                                         POINTERS[ i ] && ( touches[ touches.length ] = POINTERS[ i ] );\r
  96                                 };\r
  97                                 numTouches = touches.length;\r
  98                         }\r
  99                         // touch\r
 100                         else if ( type & TOUCH ){ //sourceEventType.match(/touch/)) {\r
 101                                 touches    = Hammer.DO_TOUCHES_FIX && type & END ? [] : e.touches;\r
 102                                 numTouches = touches.length;\r
 103                         }\r
 104                         // mouse\r
 105                         else if( !touch_triggered ){\r
 106                                 numTouches = ( type & END ) ? 0 : 1;\r
 107                                 touches    = numTouches === 0 ? [] : [{\r
 108                                         identifier : 1,\r
 109                                         pageX      : e.pageX,\r
 110                                         pageY      : e.pageY,\r
 111                                         target     : e.target\r
 112                                 }];\r
 113                         };\r
 114 \r
 115                         // if we are in a end event, but when we remove one touch and\r
 116                         // we still have enough, set eventType to move\r
 117                         if( 0 < numTouches && type & END ){ // eventType === Hammer.EVENT_END ){\r
 118                                 type = type & POINTER_TYPE_MASK | MOVE;\r
 119                                 //eventType = Hammer.EVENT_MOVE;\r
 120                         } else if( !numTouches ){\r
 121                         // no touches, force the end event\r
 122                                 type = type & POINTER_TYPE_MASK | END;\r
 123                                 //eventType = Hammer.EVENT_END;\r
 124                         };\r
 125 \r
 126                         // because touchend has no touches, and we often want to use these in our gestures,\r
 127                         // we send the last move event as our eventData in touchend\r
 128                         ( !numTouches && last_move_event !== null ) ?\r
 129                                 ( e = last_move_event ):\r
 130                                 ( last_move_event = e ); // store the last move event\r
 131 \r
 132                         e = {\r
 133                                 center      : Utils.getCenter( touches ),\r
 134                                 timeStamp   : Date.now ? Date.now() : +new Date,\r
 135                                 target      : e.target,\r
 136                                 touches     : touches,\r
 137                                 eventType   : type & EVENT_TYPE_MASK,\r
 138                                 pointerType : type & POINTER_TYPE_MASK\r
 139                         };\r
 140 \r
 141                         console.log( '2 : ' + type + ' .............. ' + last_move_event.type )\r
 142 \r
 143                         if( type & START ){\r
 144                                 console.log( '2a : ' + type + ' .............. ' + last_move_event.type )\r
 145                                 if( !this.enabled ) return;\r
 146                                 // already busy with a Hammer.gesture detection on an element\r
 147                                 console.log( '2b : ' + type + ' .............. ' + last_move_event.type )\r
 148                                 if( Detection.current ) return;\r
 149                                 Detection.current = {\r
 150                                         hammer     : this, // reference to HammerInstance we're working for\r
 151                                         startEvent : Utils.extend( {}, e ), // start eventData for distances, timing etc\r
 152                                         lastEvent  : false, // last eventData\r
 153                                         name       : '' // current gesture we're in/detected, can be 'tap', 'hold' etc\r
 154                                 };\r
 155                                 Detection.stopped = false;\r
 156                                 hammer = this;\r
 157                                 active = hammer.activeGesture;\r
 158                         } else\r
 159                         if( !Detection.current || Detection.stopped ){\r
 160                                 return;\r
 161                         } else {\r
 162                                 hammer = Detection.current.hammer;\r
 163                                 active = hammer.activeGesture;\r
 164                         };\r
 165                         \r
 166                         console.log( '3 : ' + type + ' .............. ' + last_move_event.type )\r
 167                         \r
 168                         // ----------------------------------------------------------------------------------------------------------------\r
 169                         // ret = Detection.detect( e );\r
 170 \r
 171                         // ----------------------------------------------------------------------------------------------------------------\r
 172                         // extend event data with calculations about scale, distance etc\r
 173                         // e = Detection.extendEventData( e );\r
 174                         startEv = Detection.current.startEvent;\r
 175                         center  = e.center;\r
 176 \r
 177                         // if the touches change, set the new touches over the startEvent touches\r
 178                         // this because touchevents don't have all the touches on touchstart, or the\r
 179                         // user must place his fingers at the EXACT same time on the screen, which is not realistic\r
 180                         // but, sometimes it happens that both fingers are touching at the EXACT same time\r
 181                         if( startEv && ( numTouches !== startEv.touches.length || touches === startEv.touches ) ){\r
 182                                 // extend 1 level deep to get the touchlist with the touch objects\r
 183                                 startEv.touches.length = i = 0;\r
 184                                 for( ; i < numTouches; ++i ){\r
 185                                         startEv.touches[ startEv.touches.length ] = Utils.extend( {}, touches[ i ] );\r
 186                                 };\r
 187                         };\r
 188 \r
 189                         deltaTime = e.timeStamp  - startEv.timeStamp;\r
 190                         deltaX    = center.pageX - startEv.center.pageX;\r
 191                         deltaY    = center.pageY - startEv.center.pageY;\r
 192                         velocity  = Utils.getVelocity( deltaTime, deltaX, deltaY );\r
 193 \r
 194                         Utils.extend( e, {\r
 195                                 deltaTime  : deltaTime,\r
 196 \r
 197                                 deltaX     : deltaX,\r
 198                                 deltaY     : deltaY,\r
 199 \r
 200                                 velocityX  : velocity.x,\r
 201                                 velocityY  : velocity.y,\r
 202 \r
 203                                 distance   : Utils.getDistance( startEv.center, center ),\r
 204                                 angle      : Utils.getAngle( startEv.center, center ),\r
 205                                 direction  : Utils.getDirection( startEv.center, center ),\r
 206 \r
 207                                 scale      : Utils.getScale( startEv.touches, touches ),\r
 208                                 rotation   : Utils.getRotation( startEv.touches, touches ),\r
 209 \r
 210                                 startEvent : startEv\r
 211                         });\r
 212 \r
 213 \r
 214                         // call Hammer.gesture handlers\r
 215                         for( i = 0, l = gestures.length; i < l; ++i ){\r
 216                                 gesture = gestures[ i ];\r
 217                                 if( Detection.stopped ) break;\r
 218                                 if( active[ gesture.name ] ) console.log( gesture.name );\r
 219                                 // only when the instance options have enabled this gesture\r
 220                                 active[ gesture.name ] &&\r
 221                                         // if a handler returns false, we stop with the detection\r
 222                                         ( ret |= ( gesture.handler.call( gesture, e, hammer ) || X.Callback.NONE ) );\r
 223                         };\r
 224 \r
 225                         // store as previous event event\r
 226                         Detection.current.lastEvent = e;\r
 227 \r
 228                         // endevent, but not the last touch, so dont stop\r
 229                         type & END && numTouches === 0 && Detection.stopDetect();\r
 230                         \r
 231                         // ----------------------------------------------------------------------------------------------------------------\r
 232                         // trigger the handler\r
 233                         //handler.call( context, HamEvent.collectEventData( element, eventType, e ) );\r
 234 \r
 235                         // remove pointerevent from list\r
 236                         if( Hammer.HAS_POINTEREVENTS && type & END ){ // eventType === Hammer.EVENT_END ){\r
 237                                 numTouches = 0;\r
 238                         };\r
 239                 };\r
 240 \r
 241                 //debug(sourceEventType +" "+ eventType);\r
 242 \r
 243                 // on the end we reset everything\r
 244                 if( numTouches === 0 ){\r
 245                         last_move_event = null;\r
 246                         enable_detect   = false;\r
 247                         touch_triggered = false;\r
 248                         POINTERS.length = 0;\r
 249                 };\r
 250                 \r
 251                 return ret;\r
 252         };\r
 253         \r
 254         Hammer.startup = function( uinodeRoot ){\r
 255                 // find what eventtypes we add listeners to\r
 256                 /**\r
 257                  * we have different events for each device/browser\r
 258                  * determine what we need and set them in the Hammer.EVENT_TYPES constant\r
 259                  */\r
 260                 // determine the eventtype we want to set\r
 261                 // for non pointer events browsers and mixed browsers,\r
 262                 // like chrome on windows8 touch laptop         \r
 263                 var types, name;\r
 264 \r
 265                 // Register all gestures inside Gestures\r
 266                 for( name in Gestures ){\r
 267                         Gestures.hasOwnProperty( name ) && Detection.register( Gestures[ name ] );\r
 268                 };\r
 269 \r
 270                 if( navigator.pointerEnabled || navigator.msPointerEnabled ){\r
 271                         Hammer.EVENT_TYPES_START = [ X.View.Event._POINTER_DOWN ];\r
 272                         types = [ X.View.Event._POINTER_MOVE, X.View.Event._POINTER_UP, X.View.Event._POINTER_CANCEL ];\r
 273                 } else\r
 274                 if( window.ontouchstart !== void 0 ){\r
 275                         Hammer.EVENT_TYPES_START = [ X.View.Event._TOUCH_START ];\r
 276                         types = [ X.View.Event._TOUCH_MOVE, X.View.Event._MOUSE_MOVE, X.View.Event._TOUCH_END, X.View.Event._TOUCH_CANCEL ];\r
 277                 } else {\r
 278                         Hammer.EVENT_TYPES_START = [ X.View.Event._MOUSE_DOWN ];\r
 279                         types = [ X.View.Event._MOUSE_MOVE, X.View.Event._MOUSE_UP, X.View.Event._MOUSE_CANCEL ];\r
 280                 };\r
 281 \r
 282                 // Add touch events on the document\r
 283                 Utils.addEvents( uinodeRoot, types, Hammer.prototype.handleEvent );\r
 284 \r
 285                 // Hammer is ready...!\r
 286                 delete Hammer.startup;\r
 287         };\r
 288         \r
 289         Hammer.prototype.trigger = function( type, gesture ){\r
 290                 if( !this.types[ type ] ) return;\r
 291                 var e = Utils.extend( {}, gesture );\r
 292                 e.type = type;\r
 293                 console.log( 'trigger : ' + type )\r
 294                 return this.uinode.dispatch( e );\r
 295         };\r
 296         \r
 297         Hammer.prototype.listen = function( type ){\r
 298                 var gestures = Detection.gestures,\r
 299                         i = gestures.length, g;\r
 300                 for( ; i; ){\r
 301                         g = gestures[ --i ];\r
 302                         if( g.startID <= type && type <= g.endID ){\r
 303                                 if( !this.activeGesture ) this.activeGesture = {};\r
 304                                 if( !this.types ) this.types = {};\r
 305                                 this.activeGesture[ g.name ] = this.types[ type ] = 1;\r
 306                                 return;\r
 307                         };\r
 308                 };\r
 309         };\r
 310         \r
 311         Hammer.prototype.unlisten = function( type ){\r
 312                 var gestures = Detection.gestures,\r
 313                         i = gestures.length, g;\r
 314                 if( !this.activeGesture ) return;\r
 315                 for( ; i; ){\r
 316                         g = gestures[ --i ];\r
 317                         if( g.startID <= type && type <= g.endID ){\r
 318                                 if( this.activeGesture[ g.name ] ){\r
 319                                         if( this.types[ type ] ) delete this.types[ type ];\r
 320                                         for( i = g.startID; i <= g.endID; ++i ){\r
 321                                                 if( this.types[ i ] ) return;\r
 322                                         };\r
 323                                         delete this.activeGesture[ g.name ];\r
 324                                 };\r
 325                                 return;\r
 326                         };\r
 327                 };\r
 328         };\r
 329         \r
 330         /*\r
 331          *  "Android version < 2.2" return ev.touches.length === 1 when touchend, others return ev.touches.length === 0\r
 332          */\r
 333         Hammer.DO_TOUCHES_FIX = Hammer.HAS_TOUCHEVENTS && ( function( ua, i ){\r
 334                                 if( ( i = ua.indexOf('android') ) === -1 ) return false;\r
 335                                 return ( parseFloat( ua.substr( i + 8 ) ) || 0 ) < 2.2;\r
 336                         })( navigator.userAgent.toLowerCase() );\r
 337         \r
 338         // detect touchevents\r
 339         Hammer.HAS_POINTEREVENTS = navigator.pointerEnabled || navigator.msPointerEnabled;\r
 340 \r
 341         // eventtypes per touchevent (start, move, end)\r
 342         // are filled by HamEvent.determineEventTypes on setup\r
 343         Hammer.EVENT_TYPES_START = null;\r
 344 \r
 345         // direction defines\r
 346         Hammer.DIRECTION_DOWN  = 'down';\r
 347         Hammer.DIRECTION_LEFT  = 'left';\r
 348         Hammer.DIRECTION_UP    = 'up';\r
 349         Hammer.DIRECTION_RIGHT = 'right';\r
 350 \r
 351         // plugins namespace\r
 352         Hammer.plugins = {};\r
 353 \r
 354         var POINTER     = 1,\r
 355                 TOUCH       = 2,\r
 356                 PEN         = 8, //4,\r
 357                 MOUSE       = 8,\r
 358                 START       = 16,\r
 359                 MOVE        = 32,\r
 360                 END         = 64,\r
 361                 CANCEL      = 128,\r
 362                 EVENT_TYPE_MASK   = START | MOVE | END,\r
 363                 POINTER_TYPE_MASK = POINTER | TOUCH | MOUSE | PEN,\r
 364                 IdToGestureID = {};\r
 365         IdToGestureID[ X.View.Event._POINTER_DOWN   ] = START;\r
 366         IdToGestureID[ X.View.Event._POINTER_MOVE   ] = MOVE;\r
 367         IdToGestureID[ X.View.Event._POINTER_UP     ] = END;\r
 368         IdToGestureID[ X.View.Event._POINTER_CANCEL ] = END;\r
 369         \r
 370         IdToGestureID[ X.View.Event._TOUCH_START  ] = START;\r
 371         IdToGestureID[ X.View.Event._TOUCH_MOVE   ] = MOVE;\r
 372         IdToGestureID[ X.View.Event._TOUCH_END    ] = END;\r
 373         IdToGestureID[ X.View.Event._TOUCH_CANCEL ] = END;\r
 374         \r
 375         IdToGestureID[ X.View.Event._MOUSE_DOWN   ] = START;\r
 376         IdToGestureID[ X.View.Event._MOUSE_MOVE   ] = MOVE;\r
 377         IdToGestureID[ X.View.Event._MOUSE_UP     ] = END;\r
 378         IdToGestureID[ X.View.Event._MOUSE_CANCEL ] = END;\r
 379         \r
 380         Utils = {\r
 381                 \r
 382                 /**\r
 383                  * touch events with mouse fallback\r
 384                  * @param   {HTMLElement}   element\r
 385                  * @param   {String}        eventType        like Hammer.EVENT_MOVE\r
 386                  * @param   {Function}      handler\r
 387                  */\r
 388                 addEvents : function( uinode, types, context ){\r
 389                         for( var i = 0; i < types.length; ++i ){\r
 390                                 uinode.listen( types[ i ], context );\r
 391                         };\r
 392                 },\r
 393                 \r
 394                 /**\r
 395                  * extend method,\r
 396                  * also used for cloning when dest is an empty object\r
 397                  * @param   {Object}    dest\r
 398                  * @param   {Object}    src\r
 399                  * @parm        {Boolean}       merge           do a merge\r
 400                  * @returns {Object}    dest\r
 401                  */\r
 402                 extend : function extend( dest, src, merge ){\r
 403                         for( var key in src ){\r
 404                                 if( dest[ key ] !== undefined && merge ) continue;\r
 405                                 dest[ key ] = src[ key ];\r
 406                         };\r
 407                         return dest;\r
 408                 },\r
 409 \r
 410                 /**\r
 411                  * find if a node is in the given parent\r
 412                  * used for event delegation tricks\r
 413                  * @param   {HTMLElement}   node\r
 414                  * @param   {HTMLElement}   parent\r
 415                  * @returns {boolean}       has_parent\r
 416                  */\r
 417                 hasParent : function( node, parent ){\r
 418                         while( node && node.tagName ){ /* tagName for ie */\r
 419                                 if( node === parent ) return true;\r
 420                                 node = node.parentNode;\r
 421                         };\r
 422                         return false;\r
 423                 },\r
 424 \r
 425                 /**\r
 426                  * get the center of all the touches\r
 427                  * @param   {Array}     touches\r
 428                  * @returns {Object}    center\r
 429                  */\r
 430                 getCenter : function getCenter(touches) {\r
 431                         var i = 0,\r
 432                                 l = touches.length,\r
 433                                 valuesX, valuesY;\r
 434                         switch( l ){\r
 435                                 case 0 :\r
 436                                         return {};\r
 437                                 case 1 :\r
 438                                         return {\r
 439                                                 pageX : touches[ 0 ].pageX,\r
 440                                                 pageY : touches[ 0 ].pageY\r
 441                                         };\r
 442                                 case 2 :\r
 443                                         return {\r
 444                                                 pageX : ( touches[ 0 ].pageX + touches[ 1 ].pageX ) / 2,\r
 445                                                 pageY : ( touches[ 0 ].pageY + touches[ 1 ].pageY ) / 2\r
 446                                         };\r
 447                         };\r
 448                         valuesX = [];\r
 449                         valuesY = [];\r
 450                         for( ; i < l; ++i ){\r
 451                                 valuesX[ valuesX.length ] = touches[ i ].pageX;\r
 452                                 valuesY[ valuesY.length ] = touches[ i ].pageY;\r
 453                         };\r
 454                         return {\r
 455                                 pageX : ( ( Math.min.apply( null, valuesX ) + Math.max.apply( null, valuesX ) ) / 2 ),\r
 456                                 pageY : ( ( Math.min.apply( null, valuesY ) + Math.max.apply( null, valuesY ) ) / 2 )\r
 457                         };\r
 458                 },\r
 459 \r
 460                 /**\r
 461                  * calculate the velocity between two points\r
 462                  * @param   {Number}    deltaTime\r
 463                  * @param   {Number}    deltaX\r
 464                  * @param   {Number}    deltaY\r
 465                  * @returns {Object}    velocity\r
 466                  */\r
 467                 getVelocity : function getVelocity( deltaTime, deltaX, deltaY ) {\r
 468                         return {\r
 469                                 x : ABS( deltaX / deltaTime ) || 0,\r
 470                                 y : ABS( deltaY / deltaTime ) || 0\r
 471                         };\r
 472                 },\r
 473 \r
 474                 /**\r
 475                  * calculate the angle between two coordinates\r
 476                  * @param   {Touch}     touch1\r
 477                  * @param   {Touch}     touch2\r
 478                  * @returns {Number}    angle\r
 479                  */\r
 480                 getAngle : function getAngle(touch1, touch2) {\r
 481                         var y = touch2.pageY - touch1.pageY,\r
 482                                 x = touch2.pageX - touch1.pageX;\r
 483                         return Math.atan2( y, x ) * 180 / Math.PI;\r
 484                 },\r
 485 \r
 486                 /**\r
 487                  * angle to direction define\r
 488                  * @param   {Touch}     touch1\r
 489                  * @param   {Touch}     touch2\r
 490                  * @returns {String}    direction constant, like Hammer.DIRECTION_LEFT\r
 491                  */\r
 492                 getDirection : function getDirection( touch1, touch2 ){\r
 493                         var x = touch1.pageX - touch2.pageX,\r
 494                                 y = touch1.pageY - touch2.pageY;\r
 495                         return ABS( y ) <= ABS( x ) ?\r
 496                                 ( x > 0 ? Hammer.DIRECTION_LEFT : Hammer.DIRECTION_RIGHT ) :\r
 497                                 ( y > 0 ? Hammer.DIRECTION_UP   : Hammer.DIRECTION_DOWN );\r
 498                 },\r
 499 \r
 500                 /**\r
 501                  * calculate the distance between two touches\r
 502                  * @param   {Touch}     touch1\r
 503                  * @param   {Touch}     touch2\r
 504                  * @returns {Number}    distance\r
 505                  */\r
 506                 getDistance : function getDistance( touch1, touch2 ){\r
 507                         var x = touch2.pageX - touch1.pageX,\r
 508                                 y = touch2.pageY - touch1.pageY;\r
 509                         return Math.sqrt( ( x * x ) + ( y * y ) );\r
 510                 },\r
 511 \r
 512                 /**\r
 513                  * calculate the scale factor between two touchLists (fingers)\r
 514                  * no scale is 1, and goes down to 0 when pinched together, and bigger when pinched out\r
 515                  * @param   {Array}     start\r
 516                  * @param   {Array}     end\r
 517                  * @returns {Number}    scale\r
 518                  */\r
 519                 getScale : function getScale( start, end ){\r
 520                         // need two fingers...\r
 521                         return ( 2 <= start.length && 2 <= end.length ) ?\r
 522                                 Utils.getDistance( end[ 0 ], end[ 1 ] ) / Utils.getDistance( start[ 0 ], start[ 1 ] ) :\r
 523                                 1;\r
 524                 },\r
 525 \r
 526                 /**\r
 527                  * calculate the rotation degrees between two touchLists (fingers)\r
 528                  * @param   {Array}     start\r
 529                  * @param   {Array}     end\r
 530                  * @returns {Number}    rotation\r
 531                  */\r
 532                 getRotation : function getRotation( start, end ){\r
 533                         // need two fingers\r
 534                         return ( 2 <= start.length && 2 <= end.length ) ?\r
 535                                 Utils.getAngle( end[ 1 ], end[ 0 ] ) - Utils.getAngle( start[ 1 ], start[ 0 ] ) :\r
 536                                 0;\r
 537                 },\r
 538 \r
 539                 /**\r
 540                  * boolean if the direction is vertical\r
 541                  * @param    {String}    direction\r
 542                  * @returns  {Boolean}   is_vertical\r
 543                  */\r
 544                 isVertical : function isVertical( direction ){\r
 545                         return direction === Hammer.DIRECTION_UP || direction === Hammer.DIRECTION_DOWN;\r
 546                 }\r
 547         };\r
 548         \r
 549         /**\r
 550          * this holds the last move event,\r
 551          * used to fix empty touchend issue\r
 552          * see the onTouch event for an explanation\r
 553          * @type {Object}\r
 554          */\r
 555         var last_move_event = null;\r
 556 \r
 557         /**\r
 558          * when the mouse is hold down, this is true\r
 559          * @type {Boolean}\r
 560          */\r
 561         var enable_detect = false;\r
 562 \r
 563         /**\r
 564          * when touch events have been fired, this is true\r
 565          * @type {Boolean}\r
 566          */\r
 567         var touch_triggered = false;\r
 568         \r
 569         Detection = {\r
 570                 // contains all registred Gestures in the correct order\r
 571                 gestures : [],\r
 572 \r
 573                 // data of the current Hammer.gesture detection session\r
 574                 current : null,\r
 575 \r
 576                 // the previous Hammer.gesture session data\r
 577                 // is a full clone of the previous gesture.current object\r
 578                 previous : null,\r
 579 \r
 580                 // when this becomes true, no gestures are fired\r
 581                 stopped : false,\r
 582 \r
 583                 /**\r
 584                  * clear the Hammer.gesture vars\r
 585                  * this is called on endDetect, but can also be used when a final Hammer.gesture has been detected\r
 586                  * to stop other Gestures from being fired\r
 587                  */\r
 588                 stopDetect : function stopDetect() {\r
 589                         // clone current data to the store as the previous gesture\r
 590                         // used for the double tap gesture, since this is an other gesture detect session\r
 591                         Detection.previous = Utils.extend( {}, Detection.current );\r
 592 \r
 593                         // reset the current\r
 594                         Detection.current = null;\r
 595 \r
 596                         // stopped!\r
 597                         Detection.stopped = true;\r
 598                 },\r
 599 \r
 600                 /**\r
 601                  * register new gesture\r
 602                  * @param   {Object}    gesture object, see gestures.js for documentation\r
 603                  * @returns {Array}     gestures\r
 604                  */\r
 605                 register : function( gesture ){\r
 606                         // add an enable gesture options if there is no given\r
 607                         var options = gesture.defaults || {};\r
 608                         if( options[ gesture.name ] === undefined ) options[ gesture.name ] = true;\r
 609 \r
 610                         // extend Hammer default options with the Hammer.gesture options\r
 611                         Utils.extend( Hammer.defaults, options, true );\r
 612 \r
 613                         // set its index\r
 614                         gesture.index = gesture.index || 1000;\r
 615 \r
 616                         // add Hammer.gesture to the list\r
 617                         Detection.gestures.push( gesture );\r
 618 \r
 619                         // sort the list by index\r
 620                         Detection.gestures.sort( function( a, b ){\r
 621                                 return\r
 622                                         a.index < b.index ? -1 :\r
 623                                         a.index > b.index ? 1 : 0;\r
 624                         });\r
 625                 }\r
 626         };\r
 627 \r
 628         var Gestures = Gestures || {};\r
 629 \r
 630         /**\r
 631          * Custom gestures\r
 632          * ==============================\r
 633          *\r
 634          * Gesture object\r
 635          * --------------------\r
 636          * The object structure of a gesture:\r
 637          *\r
 638          * { name: 'mygesture',\r
 639          *   index: 1337,\r
 640          *   defaults: {\r
 641          *     mygesture_option: true\r
 642          *   }\r
 643          *   handler: function(type, e, inst) {\r
 644          *     // trigger gesture event\r
 645          *     inst.trigger(this.name, e );\r
 646          *   }\r
 647          * }\r
 648 \r
 649          * @param   {String}    name\r
 650          * this should be the name of the gesture, lowercase\r
 651          * it is also being used to disable/enable the gesture per instance config.\r
 652          *\r
 653          * @param   {Number}    [index=1000]\r
 654          * the index of the gesture, where it is going to be in the stack of gestures detection\r
 655          * like when you build an gesture that depends on the drag gesture, it is a good\r
 656          * idea to place it after the index of the drag gesture.\r
 657          *\r
 658          * @param   {Object}    [defaults={}]\r
 659          * the default settings of the gesture. these are added to the instance settings,\r
 660          * and can be overruled per instance. you can also add the name of the gesture,\r
 661          * but this is also added by default (and set to true).\r
 662          *\r
 663          * @param   {Function}  handler\r
 664          * this handles the gesture detection of your custom gesture and receives the\r
 665          * following arguments:\r
 666          *\r
 667          *      @param  {Object}    eventData\r
 668          *      event data containing the following properties:\r
 669          *          timeStamp   {Number}        time the event occurred\r
 670          *          target      {HTMLElement}   target element\r
 671          *          touches     {Array}         touches (fingers, pointers, mouse) on the screen\r
 672          *          pointerType {String}        kind of pointer that was used. matches Hammer.POINTER_MOUSE|TOUCH\r
 673          *          center      {Object}        center position of the touches. contains pageX and pageY\r
 674          *          deltaTime   {Number}        the total time of the touches in the screen\r
 675          *          deltaX      {Number}        the delta on x axis we haved moved\r
 676          *          deltaY      {Number}        the delta on y axis we haved moved\r
 677          *          velocityX   {Number}        the velocity on the x\r
 678          *          velocityY   {Number}        the velocity on y\r
 679          *          angle       {Number}        the angle we are moving\r
 680          *          direction   {String}        the direction we are moving. matches Hammer.DIRECTION_UP|DOWN|LEFT|RIGHT\r
 681          *          distance    {Number}        the distance we haved moved\r
 682          *          scale       {Number}        scaling of the touches, needs 2 touches\r
 683          *          rotation    {Number}        rotation of the touches, needs 2 touches *\r
 684          *          eventType   {String}        matches Hammer.EVENT_START|MOVE|END\r
 685          *          srcEvent    {Object}        the source event, like TouchStart or MouseDown *\r
 686          *          startEvent  {Object}        contains the same properties as above,\r
 687          *                                      but from the first touch. this is used to calculate\r
 688          *                                      distances, deltaTime, scaling etc\r
 689          *\r
 690          *      @param  {Hammer.Instance}    inst\r
 691          *      the instance we are doing the detection for. you can get the options from\r
 692          *      the inst.options object and trigger the gesture event by calling inst.trigger\r
 693          *\r
 694          *\r
 695          * Handle gestures\r
 696          * --------------------\r
 697          * inside the handler you can get/set Detection.current. This is the current\r
 698          * detection session. It has the following properties\r
 699          *      @param  {String}    name\r
 700          *      contains the name of the gesture we have detected. it has not a real function,\r
 701          *      only to check in other gestures if something is detected.\r
 702          *      like in the drag gesture we set it to 'drag' and in the swipe gesture we can\r
 703          *      check if the current gesture is 'drag' by accessing Detection.current.name\r
 704          *\r
 705          *      @readonly\r
 706          *      @param  {Hammer.Instance}    inst\r
 707          *      the instance we do the detection for\r
 708          *\r
 709          *      @readonly\r
 710          *      @param  {Object}    startEvent\r
 711          *      contains the properties of the first gesture detection in this session.\r
 712          *      Used for calculations about timing, distance, etc.\r
 713          *\r
 714          *      @readonly\r
 715          *      @param  {Object}    lastEvent\r
 716          *      contains all the properties of the last gesture detect in this session.\r
 717          *\r
 718          * after the gesture detection session has been completed (user has released the screen)\r
 719          * the Detection.current object is copied into Detection.previous,\r
 720          * this is usefull for gestures like doubletap, where you need to know if the\r
 721          * previous gesture was a tap\r
 722          *\r
 723          * options that have been set by the instance can be received by calling inst.options\r
 724          *\r
 725          * You can trigger a gesture event by calling inst.trigger("mygesture", event).\r
 726          * The first param is the name of your gesture, the second the event argument\r
 727          *\r
 728          *\r
 729          * Register gestures\r
 730          * --------------------\r
 731          * When an gesture is added to the Gestures object, it is auto registered\r
 732          * at the setup of the first Hammer instance. You can also call Detection.register\r
 733          * manually and pass your gesture object as a param\r
 734          *\r
 735          */\r
 736 \r
 737         /**\r
 738          * Hold\r
 739          * Touch stays at the same place for x time\r
 740          * @events  hold holdend\r
 741          */\r
 742         Gestures.Hold = {\r
 743                 name  : 'hold',\r
 744                 index : 10,\r
 745                 startID : X.View.Event.HOLD,\r
 746                 endID   : X.View.Event.HOLD_END,\r
 747                 defaults : {\r
 748                         hold_timeout   : 500,\r
 749                         hold_threshold : 1\r
 750                 },\r
 751                 timerID : null,\r
 752                 holding : false,\r
 753                 handler : function holdGesture( e, hammer ){\r
 754                         switch( e.eventType ){\r
 755                                 case START :\r
 756                                         // clear any running timers\r
 757                                         this.timerID && X.Timer.remove( this.timerID );\r
 758 \r
 759                                         // set the gesture so we can check in the timeout if it still is\r
 760                                         Detection.current.name = this.name;\r
 761                                         Gestures.Hold.holding = false;\r
 762                                         \r
 763                                         // set timer and if after the timeout it still is hold,\r
 764                                         // we trigger the hold event\r
 765                                         this.timerID = X.Timer.add( hammer.options.hold_timeout, 1, Gestures.Hold._onTimer, [ e, hammer ] );\r
 766                                         return;\r
 767 \r
 768                                 // when you move or end we clear the timer\r
 769                                 case MOVE :\r
 770                                         if( e.distance <= hammer.options.hold_threshold ) return;\r
 771                                 case END :\r
 772                                         this.timerID && X.Timer.remove( this.timerID );\r
 773                                         if( Gestures.Hold.holding === true ){\r
 774                                                 Gestures.Hold.holding = false;\r
 775                                                 return hammer.trigger( X.View.Event.HOLD_END, e );\r
 776                                         };\r
 777                                         break;\r
 778                         };\r
 779                 },\r
 780                 _onTimer : function( e, hammer ){\r
 781                         if( Detection.current.name === 'hold' ){\r
 782                                 hammer.trigger( X.View.Event.HOLD, e );\r
 783                                 Gestures.Hold.holding = true;\r
 784                         };\r
 785                 }\r
 786         };\r
 787 \r
 788         /**\r
 789          * Tap/DoubleTap\r
 790          * Quick touch at a place or double at the same place\r
 791          * @events  tap, doubletap\r
 792          */\r
 793         Gestures.Tap = {\r
 794                 name     : 'tap',\r
 795                 index    : 100,\r
 796                 startID  : X.View.Event.TAP,\r
 797                 endID    : X.View.Event.DOUBLE_TAP,\r
 798                 defaults : {\r
 799                         tap_max_touchtime  : 250,\r
 800                         tap_max_distance   : 10,\r
 801                         tap_always         : true,\r
 802                         doubletap_distance : 20,\r
 803                         doubletap_interval : 300\r
 804                 },\r
 805                 handler : function tapGesture( e, hammer ){\r
 806                         // previous gesture, for the double tap since these are two different gesture detections\r
 807                         var prev = Detection.previous;\r
 808                         if( e.eventType === END ){\r
 809                                 // when the touchtime is higher then the max touch time\r
 810                                 // or when the moving distance is too much\r
 811                                 if( hammer.options.tap_max_touchtime < e.deltaTime || hammer.options.tap_max_distance < e.distance ) return;\r
 812 \r
 813                                 // check if double tap\r
 814                                 if( prev && prev.name === 'tap' && ( e.timeStamp - prev.lastEvent.timeStamp ) < hammer.options.doubletap_interval && e.distance < hammer.options.doubletap_distance ){\r
 815                                         return hammer.trigger( X.View.Event.DOUBLE_TAP, e );\r
 816                                 } else\r
 817                                 // do a single tap\r
 818                                 if( hammer.options.tap_always ){\r
 819                                         Detection.current.name = 'tap';\r
 820                                         return hammer.trigger(  X.View.Event.TAP, e );\r
 821                                 };\r
 822                         };\r
 823                 }\r
 824         };\r
 825 \r
 826         /**\r
 827          * Swipe\r
 828          * triggers swipe events when the end velocity is above the threshold\r
 829          * @events  swipe, swipeleft, swiperight, swipeup, swipedown\r
 830          */\r
 831         Gestures.Swipe = {\r
 832                 name : 'swipe',\r
 833                 index : 40,\r
 834                 startID  : X.View.Event.SWIP,\r
 835                 endID    : X.View.Event.SWIP_DOWN,\r
 836                 defaults : {\r
 837                         // set 0 for unlimited, but this can conflict with transform\r
 838                         swipe_max_touches : 1,\r
 839                         swipe_velocity : 0.7\r
 840                 },\r
 841                 handler : function swipeGesture(e, hammer) {\r
 842                         if( e.eventType === END ){\r
 843                                 // max touches\r
 844                                 if( 0 < hammer.options.swipe_max_touches && hammer.options.swipe_max_touches < e.touches.length ) return;\r
 845 \r
 846                                 // when the distance we moved is too small we skip this gesture\r
 847                                 // or we can be already in dragging\r
 848                                 if( hammer.options.swipe_velocity < e.velocityX || hammer.options.swipe_velocity < e.velocityY ){\r
 849                                         // trigger swipe events\r
 850                                         hammer.trigger( X.View.Event.SWIP, e );\r
 851                                         hammer.trigger(\r
 852                                                 e.direction === Hammer.DIRECTION_UP ?\r
 853                                                         X.View.Event.SWIP_UP :\r
 854                                                 e.direction === Hammer.DIRECTION_DOWN ?\r
 855                                                         X.View.Event.SWIP_DOWN :\r
 856                                                 e.direction === Hammer.DIRECTION_LEFT ?\r
 857                                                         X.View.Event.SWIP_LEFT :\r
 858                                                         X.View.Event.SWIP_RIGHT,\r
 859                                                 e\r
 860                                         );\r
 861                                 };\r
 862                         };\r
 863                 }\r
 864         };\r
 865 \r
 866         /**\r
 867          * Drag\r
 868          * Move with x fingers (default 1) around on the page. Blocking the scrolling when\r
 869          * moving left and right is a good practice. When all the drag events are blocking\r
 870          * you disable scrolling on that area.\r
 871          * @events  drag, dragstart, dragend, drapleft, dragright, dragup, dragdown\r
 872          */\r
 873         Gestures.Drag = {\r
 874                 name : 'drag',\r
 875                 index : 50,\r
 876                 startID  : X.View.Event.DRAG,\r
 877                 endID    : X.View.Event.DRAG_DOWN,\r
 878                 defaults : {\r
 879                         drag_min_distance : 10,\r
 880                         // set 0 for unlimited, but this can conflict with transform\r
 881                         drag_max_touches : 1,\r
 882                         // prevent default browser behavior when dragging occurs\r
 883                         // be careful with it, it makes the element a blocking element\r
 884                         // when you are using the drag gesture, it is a good practice to set this true\r
 885                         drag_block_horizontal : false,\r
 886                         drag_block_vertical : false,\r
 887                         // drag_lock_to_axis keeps the drag gesture on the axis that it started on,\r
 888                         // It disallows vertical directions if the initial direction was horizontal, and vice versa.\r
 889                         drag_lock_to_axis : false,\r
 890                         // drag lock only kicks in when distance > drag_lock_min_distance\r
 891                         // This way, locking occurs only when the distance has become large enough to reliably determine the direction\r
 892                         drag_lock_min_distance : 25\r
 893                 },\r
 894                 triggered : false,\r
 895                 handler : function dragGesture( e, hammer ){\r
 896                         var last_direction;\r
 897                         // current gesture isnt drag, but dragged is true\r
 898                         // this means an other gesture is busy. now call dragend\r
 899                         if( Detection.current.name !== this.name && this.triggered ){\r
 900                                 hammer.trigger( X.View.Event.DRAG_END, e );\r
 901                                 this.triggered = false;\r
 902                                 return;\r
 903                         };\r
 904 \r
 905                         // max touches\r
 906                         if( 0 < hammer.options.drag_max_touches && hammer.options.drag_max_touches < e.touches.length ) return;\r
 907 \r
 908                         switch( e.eventType ){\r
 909                                 case START:\r
 910                                         this.triggered = false;\r
 911                                         break;\r
 912 \r
 913                                 case MOVE :\r
 914                                         // when the distance we moved is too small we skip this gesture\r
 915                                         // or we can be already in dragging\r
 916                                         if( e.distance < hammer.options.drag_min_distance && Detection.current.name !== this.name ) return;\r
 917 \r
 918                                         // we are dragging!\r
 919                                         Detection.current.name = this.name;\r
 920 \r
 921                                         // lock drag to axis?\r
 922                                         if( Detection.current.lastEvent.drag_locked_to_axis || ( hammer.options.drag_lock_to_axis && hammer.options.drag_lock_min_distance <= e.distance ) ){\r
 923                                                 e.drag_locked_to_axis = true;\r
 924                                         };\r
 925                                         last_direction = Detection.current.lastEvent.direction;\r
 926                                         if( e.drag_locked_to_axis && last_direction !== e.direction ){\r
 927                                                 // keep direction on the axis that the drag gesture started on\r
 928                                                 e.direction = Utils.isVertical( last_direction ) ?\r
 929                                                         ( e.deltaY < 0 ? Hammer.DIRECTION_UP   : Hammer.DIRECTION_DOWN ) :\r
 930                                                         ( e.deltaX < 0 ? Hammer.DIRECTION_LEFT : Hammer.DIRECTION_RIGHT );\r
 931                                         };\r
 932 \r
 933                                         // first time, trigger dragstart event\r
 934                                         if( !this.triggered ){\r
 935                                                 hammer.trigger( X.View.Event.DRAG_START, e );\r
 936                                                 this.triggered = true;\r
 937                                         };\r
 938 \r
 939                                         // trigger normal event\r
 940                                         hammer.trigger( X.View.Event.DRAG, e );\r
 941 \r
 942                                         // direction event, like dragdown\r
 943                                         hammer.trigger(\r
 944                                                 e.direction === Hammer.DIRECTION_UP ?\r
 945                                                         X.View.Event.DRAG_UP :\r
 946                                                 e.direction === Hammer.DIRECTION_DOWN ?\r
 947                                                         X.View.Event.DRAG_DOWN :\r
 948                                                 e.direction === Hammer.DIRECTION_LEFT ?\r
 949                                                         X.View.Event.DRAG_LEFT :\r
 950                                                         X.View.Event.DRAG_RIGHT,\r
 951                                                 e\r
 952                                         );\r
 953 \r
 954                                         // block the browser events\r
 955                                         (\r
 956                                                 ( hammer.options.drag_block_vertical   &&  Utils.isVertical( e.direction ) ) ||\r
 957                                                 ( hammer.options.drag_block_horizontal && !Utils.isVertical( e.direction ) )\r
 958                                         ) && e.preventDefault();\r
 959                                         break;\r
 960 \r
 961                                 case END:\r
 962                                         // trigger dragend\r
 963                                         this.triggered && hammer.trigger( X.View.Event.DRAG_END, e );\r
 964                                         this.triggered = false;\r
 965                                         break;\r
 966                         }\r
 967                 }\r
 968         };\r
 969 \r
 970         /**\r
 971          * Transform\r
 972          * User want to scale or rotate with 2 fingers\r
 973          * @events  transform, transformstart, transformend, pinch, pinchin, pinchout, rotate\r
 974          */\r
 975         Gestures.Transform = {\r
 976                 name : 'transform',\r
 977                 index : 45,\r
 978                 startID  : X.View.Event.TRANSFORM,\r
 979                 endID    : X.View.Event.ROTATE,\r
 980                 defaults : {\r
 981                         // factor, no scale is 1, zoomin is to 0 and zoomout until higher then 1\r
 982                         transform_min_scale : 0.01,\r
 983                         // rotation in degrees\r
 984                         transform_min_rotation : 1,\r
 985                         // prevent default browser behavior when two touches are on the screen\r
 986                         // but it makes the element a blocking element\r
 987                         // when you are using the transform gesture, it is a good practice to set this true\r
 988                         transform_always_block : false\r
 989                 },\r
 990                 triggered : false,\r
 991                 handler : function transformGesture( e, hammer ){\r
 992                         // current gesture isnt drag, but dragged is true\r
 993                         // this means an other gesture is busy. now call dragend\r
 994                         if( Detection.current.name !== this.name && this.triggered ){\r
 995                                 hammer.trigger( X.View.Event.TRANSFORM_END, e );\r
 996                                 this.triggered = false;\r
 997                                 return;\r
 998                         };\r
 999 \r
1000                         // atleast multitouch\r
1001                         if( e.touches.length < 2 ) return;\r
1002 \r
1003                         // prevent default when two fingers are on the screen\r
1004                         hammer.options.transform_always_block && e.preventDefault();\r
1005 \r
1006                         switch(e.eventType) {\r
1007                                 case START:\r
1008                                         this.triggered = false;\r
1009                                         break;\r
1010 \r
1011                                 case MOVE:\r
1012                                         var scale_threshold    = ABS( 1 - e.scale ),\r
1013                                                 rotation_threshold = ABS( e.rotation );\r
1014 \r
1015                                         // when the distance we moved is too small we skip this gesture\r
1016                                         // or we can be already in dragging\r
1017                                         if( scale_threshold < hammer.options.transform_min_scale && rotation_threshold < hammer.options.transform_min_rotation ) return;\r
1018 \r
1019                                         // we are transforming!\r
1020                                         Detection.current.name = this.name;\r
1021 \r
1022                                         // first time, trigger dragstart event\r
1023                                         if( !this.triggered ){\r
1024                                                 hammer.trigger( X.View.Event.TRANSFORM_START, e );\r
1025                                                 this.triggered = true;\r
1026                                         };\r
1027 \r
1028                                         hammer.trigger( X.View.Event.TRANSFORM, e );\r
1029                                         // basic transform event\r
1030 \r
1031                                         // trigger rotate event\r
1032                                         hammer.options.transform_min_rotation < rotation_threshold && hammer.trigger( X.View.Event.ROTATE, e );\r
1033 \r
1034                                         // trigger pinch event\r
1035                                         if( scale_threshold > hammer.options.transform_min_scale ){\r
1036                                                 hammer.trigger( X.View.Event.PINCH, e );\r
1037                                                 hammer.trigger( e.scale < 1 ? X.View.Event.PINCH_IN : X.View.Event.PINCH_OUT, e );\r
1038                                         };\r
1039                                         break;\r
1040 \r
1041                                 case END:\r
1042                                         // trigger dragend\r
1043                                         this.triggered && hammer.trigger( X.View.Event.TRANSFORM_END, e );\r
1044                                         this.triggered = false;\r
1045                                         break;\r
1046                         };\r
1047                 }\r
1048         };\r
1049 \r
1050         /**\r
1051          * Touch\r
1052          * Called as first, tells the user has touched the screen\r
1053          * @events  touch\r
1054          */\r
1055         Gestures.Touch = {\r
1056                 name : 'touch',\r
1057                 index : -Infinity,\r
1058                 defaults : {\r
1059                         // call preventDefault at touchstart, and makes the element blocking by\r
1060                         // disabling the scrolling of the page, but it improves gestures like\r
1061                         // transforming and dragging.\r
1062                         // be careful with using this, it can be very annoying for users to be stuck\r
1063                         // on the page\r
1064                         prevent_default : false,\r
1065 \r
1066                         // disable mouse events, so only touch (or pen!) input triggers events\r
1067                         prevent_mouseevents : false\r
1068                 },\r
1069                 handler : function touchGesture( e, hammer ){\r
1070                         if( hammer.options.prevent_mouseevents && e.pointerType === MOUSE ){\r
1071                                 Detection.stopDetect();\r
1072                                 return;\r
1073                         };\r
1074 \r
1075                         hammer.options.prevent_default && e.preventDefault();\r
1076 \r
1077                         e.eventType === START && hammer.trigger( this.name, e );\r
1078                 }\r
1079         };\r
1080 \r
1081         /**\r
1082          * Release\r
1083          * Called as last, tells the user has released the screen\r
1084          * @events  release\r
1085          */\r
1086         Gestures.Release = {\r
1087                 name : 'release',\r
1088                 index : Infinity,\r
1089                 handler : function releaseGesture( e, hammer ){\r
1090                         e.eventType === END && hammer.trigger( this.name, e );\r
1091                 }\r
1092         };\r
1093         \r
1094 })( Math, window, document );