iscroll.js 25.3 KB

(function(){var m=Math,mround=function(r){return r>>0;},vendor=(/webkit/i).test(navigator.appVersion)?'webkit':(/firefox/i).test(navigator.userAgent)?'Moz':'opera'in window?'O':'',isAndroid=(/android/gi).test(navigator.appVersion),isIDevice=(/iphone|ipad/gi).test(navigator.appVersion),isPlaybook=(/playbook/gi).test(navigator.appVersion),isTouchPad=(/hp-tablet/gi).test(navigator.appVersion),has3d='WebKitCSSMatrix'in window&&'m11'in new WebKitCSSMatrix(),hasTouch='ontouchstart'in window&&!isTouchPad,hasTransform=vendor+'Transform'in document.documentElement.style,hasTransitionEnd=isIDevice||isPlaybook,nextFrame=(function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(callback){return setTimeout(callback,1);}})(),cancelFrame=(function(){return window.cancelRequestAnimationFrame||window.webkitCancelAnimationFrame||window.webkitCancelRequestAnimationFrame||window.mozCancelRequestAnimationFrame||window.oCancelRequestAnimationFrame||window.msCancelRequestAnimationFrame||clearTimeout})(),RESIZE_EV='onorientationchange'in window?'orientationchange':'resize',START_EV=hasTouch?'touchstart':'mousedown',MOVE_EV=hasTouch?'touchmove':'mousemove',END_EV=hasTouch?'touchend':'mouseup',CANCEL_EV=hasTouch?'touchcancel':'mouseup',WHEEL_EV=vendor=='Moz'?'DOMMouseScroll':'mousewheel',trnOpen='translate'+(has3d?'3d(':'('),trnClose=has3d?',0)':')',iScroll=function(el,options){var that=this,doc=document,i;that.wrapper=typeof el=='object'?el:doc.getElementById(el);that.wrapper.style.overflow='hidden';that.scroller=that.wrapper.children[0];that.options={hScroll:true,vScroll:true,x:0,y:0,bounce:true,bounceLock:false,momentum:true,lockDirection:true,useTransform:true,useTransition:false,topOffset:0,checkDOMChanges:false,hScrollbar:true,vScrollbar:true,fixedScrollbar:isAndroid,hideScrollbar:isIDevice,fadeScrollbar:isIDevice&&has3d,scrollbarClass:'',zoom:false,zoomMin:1,zoomMax:4,doubleTapZoom:2,wheelAction:'scroll',snap:false,snapThreshold:1,onRefresh:null,onBeforeScrollStart:function(e){e.preventDefault();},onScrollStart:null,onBeforeScrollMove:null,onScrollMove:null,onBeforeScrollEnd:null,onScrollEnd:null,onTouchEnd:null,onDestroy:null,onZoomStart:null,onZoom:null,onZoomEnd:null};for(i in options)that.options[i]=options[i];that.x=that.options.x;that.y=that.options.y;that.options.useTransform=hasTransform?that.options.useTransform:false;that.options.hScrollbar=that.options.hScroll&&that.options.hScrollbar;that.options.vScrollbar=that.options.vScroll&&that.options.vScrollbar;that.options.zoom=that.options.useTransform&&that.options.zoom;that.options.useTransition=hasTransitionEnd&&that.options.useTransition;if(that.options.zoom&&isAndroid){trnOpen='translate(';trnClose=')';}
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pos=0;}else if(pos>that[dir+'ScrollbarMaxScroll']){if(!that.options.fixedScrollbar){size=that[dir+'ScrollbarIndicatorSize']-mround((pos-that[dir+'ScrollbarMaxScroll'])*3);if(size<8)size=8;that[dir+'ScrollbarIndicator'].style[dir=='h'?'width':'height']=size+'px';pos=that[dir+'ScrollbarMaxScroll']+(that[dir+'ScrollbarIndicatorSize']-size);}else{pos=that[dir+'ScrollbarMaxScroll'];}}
that[dir+'ScrollbarWrapper'].style[vendor+'TransitionDelay']='0';that[dir+'ScrollbarWrapper'].style.opacity=hidden&&that.options.hideScrollbar?'0':'1';that[dir+'ScrollbarIndicator'].style[vendor+'Transform']=trnOpen+(dir=='h'?pos+'px,0':'0,'+pos+'px')+trnClose;},_start:function(e){var that=this,point=hasTouch?e.touches[0]:e,matrix,x,y,c1,c2;if(!that.enabled)return;if(that.options.onBeforeScrollStart)that.options.onBeforeScrollStart.call(that,e);if(that.options.useTransition||that.options.zoom)that._transitionTime(0);that.moved=false;that.animating=false;that.zoomed=false;that.distX=0;that.distY=0;that.absDistX=0;that.absDistY=0;that.dirX=0;that.dirY=0;if(that.options.zoom&&hasTouch&&e.touches.length>1){c1=m.abs(e.touches[0].pageX-e.touches[1].pageX);c2=m.abs(e.touches[0].pageY-e.touches[1].pageY);that.touchesDistStart=m.sqrt(c1*c1+c2*c2);that.originX=m.abs(e.touches[0].pageX+e.touches[1].pageX-that.wrapperOffsetLeft*2)/2-that.x;that.originY=m.abs(e.touches[0].pageY+e.touches[1].pageY-that.wrapperOffsetTop*2)/2-that.y;if(that.options.onZoomStart)that.options.onZoomStart.call(that,e);}
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that.pointX=point.pageX;that.pointY=point.pageY;if(newX>0||newX<that.maxScrollX){newX=that.options.bounce?that.x+(deltaX/2):newX>=0||that.maxScrollX>=0?0:that.maxScrollX;}
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that.scrollTo(resetX,resetY,time||0);},_wheel:function(e){var that=this,wheelDeltaX,wheelDeltaY,deltaX,deltaY,deltaScale;if('wheelDeltaX'in e){wheelDeltaX=e.wheelDeltaX/12;wheelDeltaY=e.wheelDeltaY/12;}else if('detail'in e){wheelDeltaX=wheelDeltaY=-e.detail*3;}else{wheelDeltaX=wheelDeltaY=-e.wheelDelta;}
if(that.options.wheelAction=='zoom'){deltaScale=that.scale*Math.pow(2,1/3*(wheelDeltaY?wheelDeltaY/Math.abs(wheelDeltaY):0));if(deltaScale<that.options.zoomMin)deltaScale=that.options.zoomMin;if(deltaScale>that.options.zoomMax)deltaScale=that.options.zoomMax;if(deltaScale!=that.scale){if(!that.wheelZoomCount&&that.options.onZoomStart)that.options.onZoomStart.call(that,e);that.wheelZoomCount++;that.zoom(e.pageX,e.pageY,deltaScale,400);setTimeout(function(){that.wheelZoomCount--;if(!that.wheelZoomCount&&that.options.onZoomEnd)that.options.onZoomEnd.call(that,e);},400);}
return;}
deltaX=that.x+wheelDeltaX;deltaY=that.y+wheelDeltaY;if(deltaX>0)deltaX=0;else if(deltaX<that.maxScrollX)deltaX=that.maxScrollX;if(deltaY>that.minScrollY)deltaY=that.minScrollY;else if(deltaY<that.maxScrollY)deltaY=that.maxScrollY;that.scrollTo(deltaX,deltaY,0);},_mouseout:function(e){var t=e.relatedTarget;if(!t){this._end(e);return;}
while(t=t.parentNode)if(t==this.wrapper)return;this._end(e);},_transitionEnd:function(e){var that=this;if(e.target!=that.scroller)return;that._unbind('webkitTransitionEnd');that._startAni();},_startAni:function(){var that=this,startX=that.x,startY=that.y,startTime=Date.now(),step,easeOut,animate;if(that.animating)return;if(!that.steps.length){that._resetPos(400);return;}
step=that.steps.shift();if(step.x==startX&&step.y==startY)step.time=0;that.animating=true;that.moved=true;if(that.options.useTransition){that._transitionTime(step.time);that._pos(step.x,step.y);that.animating=false;if(step.time)that._bind('webkitTransitionEnd');else that._resetPos(0);return;}
animate=function(){var now=Date.now(),newX,newY;if(now>=startTime+step.time){that._pos(step.x,step.y);that.animating=false;if(that.options.onAnimationEnd)that.options.onAnimationEnd.call(that);that._startAni();return;}
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newDist=newDist*(dist<0?-1:1);newTime=speed/deceleration;return{dist:newDist,time:mround(newTime)};},_offset:function(el){var left=-el.offsetLeft,top=-el.offsetTop;while(el=el.offsetParent){left-=el.offsetLeft;top-=el.offsetTop;}
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