* @license
* Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt


```js
// @version 0.5.1
window.PolymerGestures={},function(a){var b=!1,c=document.createElement("meta");if(c.createShadowRoot){var d=c.createShadowRoot(),e=document.createElement("span");d.appendChild(e),c.addEventListener("testpath",function(a){a.path&&(b=a.path[0]===e),a.stopPropagation()});var f=new CustomEvent("testpath",{bubbles:!0});document.head.appendChild(c),e.dispatchEvent(f),c.parentNode.removeChild(c),d=e=null}c=null;var g={shadow:function(a){return a?a.shadowRoot||a.webkitShadowRoot:void 0},canTarget:function(a){return a&&Boolean(a.elementFromPoint)},targetingShadow:function(a){var b=this.shadow(a);return this.canTarget(b)?b:void 0},olderShadow:function(a){var b=a.olderShadowRoot;if(!b){var c=a.querySelector("shadow");c&&(b=c.olderShadowRoot)}return b},allShadows:function(a){for(var b=[],c=this.shadow(a);c;)b.push(c),c=this.olderShadow(c);return b},searchRoot:function(a,b,c){var d,e;return a?(d=a.elementFromPoint(b,c),d?e=this.targetingShadow(d):a!==document&&(e=this.olderShadow(a)),this.searchRoot(e,b,c)||d):void 0},owner:function(a){if(!a)return document;for(var b=a;b.parentNode;)b=b.parentNode;return b.nodeType!=Node.DOCUMENT_NODE&&b.nodeType!=Node.DOCUMENT_FRAGMENT_NODE&&(b=document),b},findTarget:function(a){if(b&&a.path&&a.path.length)return a.path[0];var c=a.clientX,d=a.clientY,e=this.owner(a.target);return e.elementFromPoint(c,d)||(e=document),this.searchRoot(e,c,d)},findTouchAction:function(a){var c;if(b&&a.path&&a.path.length){for(var d=a.path,e=0;e<d.length;e++)if(c=d[e],c.nodeType===Node.ELEMENT_NODE&&c.hasAttribute("touch-action"))return c.getAttribute("touch-action")}else for(c=a.target;c;){if(c.nodeType===Node.ELEMENT_NODE&&c.hasAttribute("touch-action"))return c.getAttribute("touch-action");c=c.parentNode||c.host}return"auto"},LCA:function(a,b){if(a===b)return a;if(a&&!b)return a;if(b&&!a)return b;if(!b&&!a)return document;if(a.contains&&a.contains(b))return a;if(b.contains&&b.contains(a))return b;var c=this.depth(a),d=this.depth(b),e=c-d;for(e>=0?a=this.walk(a,e):b=this.walk(b,-e);a&&b&&a!==b;)a=a.parentNode||a.host,b=b.parentNode||b.host;return a},walk:function(a,b){for(var c=0;a&&b>c;c++)a=a.parentNode||a.host;return a},depth:function(a){for(var b=0;a;)b++,a=a.parentNode||a.host;return b},deepContains:function(a,b){var c=this.LCA(a,b);return c===a},insideNode:function(a,b,c){var d=a.getBoundingClientRect();return d.left<=b&&b<=d.right&&d.top<=c&&c<=d.bottom},path:function(a){var c;if(b&&a.path&&a.path.length)c=a.path;else{c=[];for(var d=this.findTarget(a);d;)c.push(d),d=d.parentNode||d.host}return c}};a.targetFinding=g,a.findTarget=g.findTarget.bind(g),a.deepContains=g.deepContains.bind(g),a.insideNode=g.insideNode}(window.PolymerGestures),function(){function a(a){return"html /deep/ "+b(a)}function b(a){return'[touch-action="'+a+'"]'}function c(a){return"{ -ms-touch-action: "+a+"; touch-action: "+a+";}"}var d=["none","auto","pan-x","pan-y",{rule:"pan-x pan-y",selectors:["pan-x pan-y","pan-y pan-x"]},"manipulation"],e="",f="string"==typeof document.head.style.touchAction,g=!window.ShadowDOMPolyfill&&document.head.createShadowRoot;if(f){d.forEach(function(d){String(d)===d?(e+=b(d)+c(d)+"\n",g&&(e+=a(d)+c(d)+"\n")):(e+=d.selectors.map(b)+c(d.rule)+"\n",g&&(e+=d.selectors.map(a)+c(d.rule)+"\n"))});var h=document.createElement("style");h.textContent=e,document.head.appendChild(h)}}(),function(a){var b=["bubbles","cancelable","view","detail","screenX","screenY","clientX","clientY","ctrlKey","altKey","shiftKey","metaKey","button","relatedTarget","pageX","pageY"],c=[!1,!1,null,null,0,0,0,0,!1,!1,!1,!1,0,null,0,0],d=function(){return function(){}},e={preventTap:d,makeBaseEvent:function(a,b){var c=document.createEvent("Event");return c.initEvent(a,b.bubbles||!1,b.cancelable||!1),c.preventTap=e.preventTap(c),c},makeGestureEvent:function(a,b){b=b||Object.create(null);for(var c,d=this.makeBaseEvent(a,b),e=0,f=Object.keys(b);e<f.length;e++)c=f[e],d[c]=b[c];return d},makePointerEvent:function(a,d){d=d||Object.create(null);for(var e,f=this.makeBaseEvent(a,d),g=0;g<b.length;g++)e=b[g],f[e]=d[e]||c[g];f.buttons=d.buttons||0;var h=0;return h=d.pressure?d.pressure:f.buttons?.5:0,f.x=f.clientX,f.y=f.clientY,f.pointerId=d.pointerId||0,f.width=d.width||0,f.height=d.height||0,f.pressure=h,f.tiltX=d.tiltX||0,f.tiltY=d.tiltY||0,f.pointerType=d.pointerType||"",f.hwTimestamp=d.hwTimestamp||0,f.isPrimary=d.isPrimary||!1,f._source=d._source||"",f}};a.eventFactory=e}(window.PolymerGestures),function(a){function b(){if(c){var a=new Map;return a.pointers=d,a}this.keys=[],this.values=[]}var c=window.Map&&window.Map.prototype.forEach,d=function(){return this.size};b.prototype={set:function(a,b){var c=this.keys.indexOf(a);c>-1?this.values[c]=b:(this.keys.push(a),this.values.push(b))},has:function(a){return this.keys.indexOf(a)>-1},"delete":function(a){var b=this.keys.indexOf(a);b>-1&&(this.keys.splice(b,1),this.values.splice(b,1))},get:function(a){var b=this.keys.indexOf(a);return this.values[b]},clear:function(){this.keys.length=0,this.values.length=0},forEach:function(a,b){this.values.forEach(function(c,d){a.call(b,c,this.keys[d],this)},this)},pointers:function(){return this.keys.length}},a.PointerMap=b}(window.PolymerGestures),function(a){var b,c=["bubbles","cancelable","view","detail","screenX","screenY","clientX","clientY","ctrlKey","altKey","shiftKey","metaKey","button","relatedTarget","buttons","pointerId","width","height","pressure","tiltX","tiltY","pointerType","hwTimestamp","isPrimary","type","target","currentTarget","which","pageX","pageY","timeStamp","preventTap","tapPrevented","_source"],d=[!1,!1,null,null,0,0,0,0,!1,!1,!1,!1,0,null,0,0,0,0,0,0,0,"",0,!1,"",null,null,0,0,0,0,function(){},!1],e="undefined"!=typeof SVGElementInstance,f=a.eventFactory,g={IS_IOS:!1,pointermap:new a.PointerMap,requiredGestures:new a.PointerMap,eventMap:Object.create(null),eventSources:Object.create(null),eventSourceList:[],gestures:[],dependencyMap:{down:{listeners:0,index:-1},up:{listeners:0,index:-1}},gestureQueue:[],registerSource:function(a,b){var c=b,d=c.events;d&&(d.forEach(function(a){c[a]&&(this.eventMap[a]=c[a].bind(c))},this),this.eventSources[a]=c,this.eventSourceList.push(c))},registerGesture:function(a,b){var c=Object.create(null);c.listeners=0,c.index=this.gestures.length;for(var d,e=0;e<b.exposes.length;e++)d=b.exposes[e].toLowerCase(),this.dependencyMap[d]=c;this.gestures.push(b)},register:function(a,b){for(var c,d=this.eventSourceList.length,e=0;d>e&&(c=this.eventSourceList[e]);e++)c.register.call(c,a,b)},unregister:function(a){for(var b,c=this.eventSourceList.length,d=0;c>d&&(b=this.eventSourceList[d]);d++)b.unregister.call(b,a)},down:function(a){this.requiredGestures.set(a.pointerId,b),this.fireEvent("down",a)},move:function(a){a.type="move",this.fillGestureQueue(a)},up:function(a){this.fireEvent("up",a),this.requiredGestures.delete(a.pointerId)},cancel:function(a){a.tapPrevented=!0,this.fireEvent("up",a),this.requiredGestures.delete(a.pointerId)},addGestureDependency:function(a,b){var c=a._pgEvents;if(c&&b)for(var d,e,f,g=Object.keys(c),h=0;h<g.length;h++)f=g[h],c[f]>0&&(d=this.dependencyMap[f],e=d?d.index:-1,b[e]=!0)},eventHandler:function(c){var d=c.type;if("touchstart"===d||"mousedown"===d||"pointerdown"===d||"MSPointerDown"===d)if(c._handledByPG||(b={}),this.IS_IOS){var e=c;if("touchstart"===d){var f=c.changedTouches[0];e={target:c.target,clientX:f.clientX,clientY:f.clientY,path:c.path}}for(var g,h=c.path||a.targetFinding.path(e),i=0;i<h.length;i++)g=h[i],this.addGestureDependency(g,b)}else this.addGestureDependency(c.currentTarget,b);if(!c._handledByPG){var j=this.eventMap&&this.eventMap[d];j&&j(c),c._handledByPG=!0}},listen:function(a,b){for(var c,d=0,e=b.length;e>d&&(c=b[d]);d++)this.addEvent(a,c)},unlisten:function(a,b){for(var c,d=0,e=b.length;e>d&&(c=b[d]);d++)this.removeEvent(a,c)},addEvent:function(a,b){a.addEventListener(b,this.boundHandler)},removeEvent:function(a,b){a.removeEventListener(b,this.boundHandler)},makeEvent:function(a,b){var c=f.makePointerEvent(a,b);return c.preventDefault=b.preventDefault,c.tapPrevented=b.tapPrevented,c._target=c._target||b.target,c},fireEvent:function(a,b){var c=this.makeEvent(a,b);return this.dispatchEvent(c)},cloneEvent:function(a){for(var b,f=Object.create(null),g=0;g<c.length;g++)b=c[g],f[b]=a[b]||d[g],("target"===b||"relatedTarget"===b)&&e&&f[b]instanceof SVGElementInstance&&(f[b]=f[b].correspondingUseElement);return f.preventDefault=function(){a.preventDefault()},f},dispatchEvent:function(a){var b=a._target;if(b){b.dispatchEvent(a);var c=this.cloneEvent(a);c.target=b,this.fillGestureQueue(c)}},gestureTrigger:function(){for(var a,b,c=0;c<this.gestureQueue.length;c++)if(a=this.gestureQueue[c],b=a._requiredGestures)for(var d,e,f=0;f<this.gestures.length;f++)b[f]&&(d=this.gestures[f],e=d[a.type],e&&e.call(d,a));this.gestureQueue.length=0},fillGestureQueue:function(a){this.gestureQueue.length||requestAnimationFrame(this.boundGestureTrigger),a._requiredGestures=this.requiredGestures.get(a.pointerId),this.gestureQueue.push(a)}};g.boundHandler=g.eventHandler.bind(g),g.boundGestureTrigger=g.gestureTrigger.bind(g),a.dispatcher=g,a.activateGesture=function(a,b){var c=b.toLowerCase(),d=g.dependencyMap[c];if(d){var e=g.gestures[d.index];if(a._pgListeners||(g.register(a),a._pgListeners=0),e){var f,h=e.defaultActions&&e.defaultActions[c];switch(a.nodeType){case Node.ELEMENT_NODE:f=a;break;case Node.DOCUMENT_FRAGMENT_NODE:f=a.host;break;default:f=null}h&&f&&!f.hasAttribute("touch-action")&&f.setAttribute("touch-action",h)}a._pgEvents||(a._pgEvents={}),a._pgEvents[c]=(a._pgEvents[c]||0)+1,a._pgListeners++}return Boolean(d)},a.addEventListener=function(b,c,d,e){d&&(a.activateGesture(b,c),b.addEventListener(c,d,e))},a.deactivateGesture=function(a,b){var c=b.toLowerCase(),d=g.dependencyMap[c];return d&&(a._pgListeners>0&&a._pgListeners--,0===a._pgListeners&&g.unregister(a),a._pgEvents&&(a._pgEvents[c]>0?a._pgEvents[c]--:a._pgEvents[c]=0)),Boolean(d)},a.removeEventListener=function(b,c,d,e){d&&(a.deactivateGesture(b,c),b.removeEventListener(c,d,e))}}(window.PolymerGestures),function(a){var b=a.dispatcher,c=b.pointermap,d=25,e=[0,1,4,2],f=0,g=!1;try{g=1===new MouseEvent("test",{buttons:1}).buttons}catch(h){}var i={POINTER_ID:1,POINTER_TYPE:"mouse",events:["mousedown","mousemove","mouseup"],exposes:["down","up","move"],register:function(a){b.listen(a,this.events)},unregister:function(a){a!==document&&b.unlisten(a,this.events)},lastTouches:[],isEventSimulatedFromTouch:function(a){for(var b,c=this.lastTouches,e=a.clientX,f=a.clientY,g=0,h=c.length;h>g&&(b=c[g]);g++){var i=Math.abs(e-b.x),j=Math.abs(f-b.y);if(d>=i&&d>=j)return!0}},prepareEvent:function(a){var c=b.cloneEvent(a);if(c.pointerId=this.POINTER_ID,c.isPrimary=!0,c.pointerType=this.POINTER_TYPE,c._source="mouse",!g){var d=a.type,h=e[a.which]||0;"mousedown"===d?f|=h:"mouseup"===d&&(f&=~h),c.buttons=f}return c},mousedown:function(d){if(!this.isEventSimulatedFromTouch(d)){var e=(c.has(this.POINTER_ID),this.prepareEvent(d));e.target=a.findTarget(d),c.set(this.POINTER_ID,e.target),b.down(e)}},mousemove:function(a){if(!this.isEventSimulatedFromTouch(a)){var d=c.get(this.POINTER_ID);if(d){var e=this.prepareEvent(a);e.target=d,0===(g?e.buttons:e.which)?(g||(f=e.buttons=0),b.cancel(e),this.cleanupMouse(e.buttons)):b.move(e)}}},mouseup:function(d){if(!this.isEventSimulatedFromTouch(d)){var e=this.prepareEvent(d);e.relatedTarget=a.findTarget(d),e.target=c.get(this.POINTER_ID),b.up(e),this.cleanupMouse(e.buttons)}},cleanupMouse:function(a){0===a&&c.delete(this.POINTER_ID)}};a.mouseEvents=i}(window.PolymerGestures),function(a){var b=a.dispatcher,c=(a.targetFinding.allShadows.bind(a.targetFinding),b.pointermap),d=(Array.prototype.map.call.bind(Array.prototype.map),2500),e=25,f=200,g=20,h=!1,i={IS_IOS:!1,events:["touchstart","touchmove","touchend","touchcancel"],exposes:["down","up","move"],register:function(a,c){(this.IS_IOS?c:!c)&&b.listen(a,this.events)},unregister:function(a){this.IS_IOS||b.unlisten(a,this.events)},scrollTypes:{EMITTER:"none",XSCROLLER:"pan-x",YSCROLLER:"pan-y"},touchActionToScrollType:function(a){var b=a,c=this.scrollTypes;return b===c.EMITTER?"none":b===c.XSCROLLER?"X":b===c.YSCROLLER?"Y":"XY"},POINTER_TYPE:"touch",firstTouch:null,isPrimaryTouch:function(a){return this.firstTouch===a.identifier},setPrimaryTouch:function(a){(0===c.pointers()||1===c.pointers()&&c.has(1))&&(this.firstTouch=a.identifier,this.firstXY={X:a.clientX,Y:a.clientY},this.firstTarget=a.target,this.scrolling=null,this.cancelResetClickCount())},removePrimaryPointer:function(a){a.isPrimary&&(this.firstTouch=null,this.firstXY=null,this.resetClickCount())},clickCount:0,resetId:null,resetClickCount:function(){var a=function(){this.clickCount=0,this.resetId=null}.bind(this);this.resetId=setTimeout(a,f)},cancelResetClickCount:function(){this.resetId&&clearTimeout(this.resetId)},typeToButtons:function(a){var b=0;return("touchstart"===a||"touchmove"===a)&&(b=1),b},findTarget:function(b,d){if("touchstart"===this.currentTouchEvent.type){if(this.isPrimaryTouch(b)){var e={clientX:b.clientX,clientY:b.clientY,path:this.currentTouchEvent.path,target:this.currentTouchEvent.target};return a.findTarget(e)}return a.findTarget(b)}return c.get(d)},touchToPointer:function(a){var c=this.currentTouchEvent,d=b.cloneEvent(a),e=d.pointerId=a.identifier+2;d.target=this.findTarget(a,e),d.bubbles=!0,d.cancelable=!0,d.detail=this.clickCount,d.buttons=this.typeToButtons(c.type),d.width=a.webkitRadiusX||a.radiusX||0,d.height=a.webkitRadiusY||a.radiusY||0,d.pressure=a.webkitForce||a.force||.5,d.isPrimary=this.isPrimaryTouch(a),d.pointerType=this.POINTER_TYPE,d._source="touch";var f=this;return d.preventDefault=function(){f.scrolling=!1,f.firstXY=null,c.preventDefault()},d},processTouches:function(a,b){var d=a.changedTouches;this.currentTouchEvent=a;for(var e,f,g=0;g<d.length;g++)e=d[g],f=this.touchToPointer(e),"touchstart"===a.type&&c.set(f.pointerId,f.target),c.has(f.pointerId)&&b.call(this,f),("touchend"===a.type||a._cancel)&&this.cleanUpPointer(f)},shouldScroll:function(b){if(this.firstXY){var c,d=a.targetFinding.findTouchAction(b),e=this.touchActionToScrollType(d);if("none"===e)c=!1;else if("XY"===e)c=!0;else{var f=b.changedTouches[0],g=e,h="Y"===e?"X":"Y",i=Math.abs(f["client"+g]-this.firstXY[g]),j=Math.abs(f["client"+h]-this.firstXY[h]);c=i>=j}return c}},findTouch:function(a,b){for(var c,d=0,e=a.length;e>d&&(c=a[d]);d++)if(c.identifier===b)return!0},vacuumTouches:function(a){var b=a.touches;if(c.pointers()>=b.length){var d=[];c.forEach(function(a,c){if(1!==c&&!this.findTouch(b,c-2)){var e=a;d.push(e)}},this),d.forEach(function(a){this.cancel(a),c.delete(a.pointerId)})}},touchstart:function(a){this.vacuumTouches(a),this.setPrimaryTouch(a.changedTouches[0]),this.dedupSynthMouse(a),this.scrolling||(this.clickCount++,this.processTouches(a,this.down))},down:function(a){b.down(a)},touchmove:function(a){if(h)a.cancelable&&this.processTouches(a,this.move);else if(this.scrolling){if(this.firstXY){var b=a.changedTouches[0],c=b.clientX-this.firstXY.X,d=b.clientY-this.firstXY.Y,e=Math.sqrt(c*c+d*d);e>=g&&(this.touchcancel(a),this.scrolling=!0,this.firstXY=null)}}else null===this.scrolling&&this.shouldScroll(a)?this.scrolling=!0:(this.scrolling=!1,a.preventDefault(),this.processTouches(a,this.move))},move:function(a){b.move(a)},touchend:function(a){this.dedupSynthMouse(a),this.processTouches(a,this.up)},up:function(c){c.relatedTarget=a.findTarget(c),b.up(c)},cancel:function(a){b.cancel(a)},touchcancel:function(a){a._cancel=!0,this.processTouches(a,this.cancel)},cleanUpPointer:function(a){c["delete"](a.pointerId),this.removePrimaryPointer(a)},dedupSynthMouse:function(b){var c=a.mouseEvents.lastTouches,e=b.changedTouches[0];if(this.isPrimaryTouch(e)){var f={x:e.clientX,y:e.clientY};c.push(f);var g=function(a,b){var c=a.indexOf(b);c>-1&&a.splice(c,1)}.bind(null,c,f);setTimeout(g,d)}}},j=Event.prototype.stopImmediatePropagation||Event.prototype.stopPropagation;document.addEventListener("click",function(b){var c=b.clientX,d=b.clientY,f=function(a){var b=Math.abs(c-a.x),f=Math.abs(d-a.y);return e>=b&&e>=f},g=a.mouseEvents.lastTouches.some(f),h=a.targetFinding.path(b);if(g){for(var k=0;k<h.length;k++)if(h[k]===i.firstTarget)return;b.preventDefault(),j.call(b)}},!0),a.touchEvents=i}(window.PolymerGestures),function(a){var b=a.dispatcher,c=b.pointermap,d=window.MSPointerEvent&&"number"==typeof window.MSPointerEvent.MSPOINTER_TYPE_MOUSE,e={events:["MSPointerDown","MSPointerMove","MSPointerUp","MSPointerCancel"],register:function(a){b.listen(a,this.events)},unregister:function(a){a!==document&&b.unlisten(a,this.events)},POINTER_TYPES:["","unavailable","touch","pen","mouse"],prepareEvent:function(a){var c=a;return c=b.cloneEvent(a),d&&(c.pointerType=this.POINTER_TYPES[a.pointerType]),c._source="ms",c},cleanup:function(a){c["delete"](a)},MSPointerDown:function(d){var e=this.prepareEvent(d);e.target=a.findTarget(d),c.set(d.pointerId,e.target),b.down(e)},MSPointerMove:function(a){var d=c.get(a.pointerId);if(d){var 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