iscroll.js 触屏手机web-kit浏览器滚动效果代码库
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iscroll.js 触屏手机web-kit浏览器滚动效果代码库
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/**!* iScroll v4.1.8 ~ Copyright (c) 2011 Matteo Spinelli, http://cubiq.org* Released under MIT license, http://cubiq.org/license*/(function(){
var m = Math,vendor = (/webkit/i).test(navigator.appVersion) ? 'webkit' :(/firefox/i).test(navigator.userAgent) ? 'Moz' :'opera' in window ? 'O' : '',// Browser capabilitieshas3d = 'WebKitCSSMatrix' in window && 'm11' in new WebKitCSSMatrix(),hasTouch = 'ontouchstart' in window,hasTransform = vendor + 'Transform' in document.documentElement.style,isAndroid = (/android/gi).test(navigator.appVersion),isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),isPlaybook = (/playbook/gi).test(navigator.appVersion),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.webkitCancelRequestAnimationFrame|| window.mozCancelRequestAnimationFrame|| window.oCancelRequestAnimationFrame|| window.msCancelRequestAnimationFrame|| clearTimeout})(),// EventsRESIZE_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',// HelperstrnOpen = 'translate' + (has3d ? '3d(' : '('),trnClose = has3d ? ',0)' : ')',// ConstructoriScroll = 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];// Default optionsthat.options = {hScroll: true,vScroll: true,bounce: true,bounceLock: false,momentum: true,lockDirection: true,useTransform: true,useTransition: false,topOffset: 0,checkDOMChanges: false, // Experimental// ScrollbarhScrollbar: true,vScrollbar: true,fixedScrollbar: isAndroid,hideScrollbar: isIDevice,fadeScrollbar: isIDevice && has3d,scrollbarClass: '',// Zoomzoom: false,zoomMin: 1,zoomMax: 4,doubleTapZoom: 2,wheelAction: 'scroll',// Snapsnap: false,snapThreshold: 1,// EventsonRefresh: 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};// User defined optionsfor (i in options) that.options[i] = options[i];// Normalize optionsthat.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;// Set some default stylesthat.scroller.style[vendor + 'TransitionProperty'] = that.options.useTransform ? '-' + vendor.toLowerCase() + '-transform' : 'top left';that.scroller.style[vendor + 'TransitionDuration'] = '0';that.scroller.style[vendor + 'TransformOrigin'] = '0 0';if (that.options.useTransition) that.scroller.style[vendor + 'TransitionTimingFunction'] = 'cubic-bezier(0.33,0.66,0.66,1)';if (that.options.useTransform) that.scroller.style[vendor + 'Transform'] = trnOpen + '0,0' + trnClose;else that.scroller.style.cssText += ';position:absolute;top:0;left:0';if (that.options.useTransition) that.options.fixedScrollbar = true;that.refresh();that._bind(RESIZE_EV, window);that._bind(START_EV);if (!hasTouch) {that._bind('mouseout', that.wrapper);that._bind(WHEEL_EV);}if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () {that._checkDOMChanges();}, 500);};// Prototype
iScroll.prototype = {enabled: true,x: 0,y: 0,steps: [],scale: 1,currPageX: 0, currPageY: 0,pagesX: [], pagesY: [],aniTime: null,wheelZoomCount: 0,handleEvent: function (e) {var that = this;switch(e.type) {case START_EV:if (!hasTouch && e.button !== 0) return;that._start(e);break;case MOVE_EV: that._move(e); break;case END_EV:case CANCEL_EV: that._end(e); break;case RESIZE_EV: that._resize(); break;case WHEEL_EV: that._wheel(e); break;case 'mouseout': that._mouseout(e); break;case 'webkitTransitionEnd': that._transitionEnd(e); break;}},_checkDOMChanges: function () {if (this.moved || this.zoomed || this.animating ||(this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;this.refresh();},_scrollbar: function (dir) {var that = this,doc = document,bar;if (!that[dir + 'Scrollbar']) {if (that[dir + 'ScrollbarWrapper']) {if (hasTransform) that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = '';that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);that[dir + 'ScrollbarWrapper'] = null;that[dir + 'ScrollbarIndicator'] = null;}return;}if (!that[dir + 'ScrollbarWrapper']) {// Create the scrollbar wrapperbar = doc.createElement('div');if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px');bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:opacity;-' + vendor + '-transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');that.wrapper.appendChild(bar);that[dir + 'ScrollbarWrapper'] = bar;// Create the scrollbar indicatorbar = doc.createElement('div');if (!that.options.scrollbarClass) {bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);-' + vendor + '-background-clip:padding-box;-' + vendor + '-box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';-' + vendor + '-border-radius:3px;border-radius:3px';}bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:-' + vendor + '-transform;-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);-' + vendor + '-transition-duration:0;-' + vendor + '-transform:' + trnOpen + '0,0' + trnClose;if (that.options.useTransition) bar.style.cssText += ';-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';that[dir + 'ScrollbarWrapper'].appendChild(bar);that[dir + 'ScrollbarIndicator'] = bar;}if (dir == 'h') {that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;} else {that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;}// Reset positionthat._scrollbarPos(dir, true);},_resize: function () {var that = this;setTimeout(function () { that.refresh(); }, isAndroid ? 200 : 0);},_pos: function (x, y) {x = this.hScroll ? x : 0;y = this.vScroll ? y : 0;if (this.options.useTransform) {this.scroller.style[vendor + 'Transform'] = trnOpen + x + 'px,' + y + 'px' + trnClose + ' scale(' + this.scale + ')';} else {x = m.round(x);y = m.round(y);this.scroller.style.left = x + 'px';this.scroller.style.top = y + 'px';}this.x = x;this.y = y;this._scrollbarPos('h');this._scrollbarPos('v');},_scrollbarPos: function (dir, hidden) {var that = this,pos = dir == 'h' ? that.x : that.y,size;if (!that[dir + 'Scrollbar']) return;pos = that[dir + 'ScrollbarProp'] * pos;if (pos < 0) {if (!that.options.fixedScrollbar) {size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);if (size < 8) size = 8;that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';}pos = 0;} else if (pos > that[dir + 'ScrollbarMaxScroll']) {if (!that.options.fixedScrollbar) {size = that[dir + 'ScrollbarIndicatorSize'] - m.round((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;// Gesture startif (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);}if (that.options.momentum) {if (that.options.useTransform) {// Very lame general purpose alternative to CSSMatrixmatrix = getComputedStyle(that.scroller, null)[vendor + 'Transform'].replace(/[^0-9-.,]/g, '').split(',');x = matrix[4] * 1;y = matrix[5] * 1;} else {x = getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '') * 1;y = getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '') * 1;}if (x != that.x || y != that.y) {if (that.options.useTransition) that._unbind('webkitTransitionEnd');else cancelFrame(that.aniTime);that.steps = [];that._pos(x, y);}}that.absStartX = that.x; // Needed by snap thresholdthat.absStartY = that.y;that.startX = that.x;that.startY = that.y;that.pointX = point.pageX;that.pointY = point.pageY;that.startTime = e.timeStamp || (new Date()).getTime();if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);that._bind(MOVE_EV);that._bind(END_EV);that._bind(CANCEL_EV);},_move: function (e) {var that = this,point = hasTouch ? e.touches[0] : e,deltaX = point.pageX - that.pointX,deltaY = point.pageY - that.pointY,newX = that.x + deltaX,newY = that.y + deltaY,c1, c2, scale,timestamp = e.timeStamp || (new Date()).getTime();if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);// Zoomif (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.touchesDist = m.sqrt(c1*c1+c2*c2);that.zoomed = true;scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin);else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale);that.lastScale = scale / this.scale;newX = this.originX - this.originX * that.lastScale + this.x,newY = this.originY - this.originY * that.lastScale + this.y;this.scroller.style[vendor + 'Transform'] = trnOpen + newX + 'px,' + newY + 'px' + trnClose + ' scale(' + scale + ')';if (that.options.onZoom) that.options.onZoom.call(that, e);return;}that.pointX = point.pageX;that.pointY = point.pageY;// Slow down if outside of the boundariesif (newX > 0 || newX < that.maxScrollX) {newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;}if (newY > that.minScrollY || newY < that.maxScrollY) { newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;}if (that.absDistX < 6 && that.absDistY < 6) {that.distX += deltaX;that.distY += deltaY;that.absDistX = m.abs(that.distX);that.absDistY = m.abs(that.distY);return;}// Lock directionif (that.options.lockDirection) {if (that.absDistX > that.absDistY + 5) {newY = that.y;deltaY = 0;} else if (that.absDistY > that.absDistX + 5) {newX = that.x;deltaX = 0;}}that.moved = true;that._pos(newX, newY);that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;if (timestamp - that.startTime > 300) {that.startTime = timestamp;that.startX = that.x;that.startY = that.y;}if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);},_end: function (e) {if (hasTouch && e.touches.length != 0) return;var that = this,point = hasTouch ? e.changedTouches[0] : e,target, ev,momentumX = { dist:0, time:0 },momentumY = { dist:0, time:0 },duration = (e.timeStamp || (new Date()).getTime()) - that.startTime,newPosX = that.x,newPosY = that.y,distX, distY,newDuration,scale;that._unbind(MOVE_EV);that._unbind(END_EV);that._unbind(CANCEL_EV);if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);if (that.zoomed) {scale = that.scale * that.lastScale;scale = Math.max(that.options.zoomMin, scale);scale = Math.min(that.options.zoomMax, scale);that.lastScale = scale / that.scale;that.scale = scale;that.x = that.originX - that.originX * that.lastScale + that.x;that.y = that.originY - that.originY * that.lastScale + that.y;that.scroller.style[vendor + 'TransitionDuration'] = '200ms';that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + that.scale + ')';that.zoomed = false;that.refresh();if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);return;}if (!that.moved) {if (hasTouch) {if (that.doubleTapTimer && that.options.zoom) {// Double tappedclearTimeout(that.doubleTapTimer);that.doubleTapTimer = null;if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);if (that.options.onZoomEnd) {setTimeout(function() {that.options.onZoomEnd.call(that, e);}, 200); // 200 is default zoom duration}} else {that.doubleTapTimer = setTimeout(function () {that.doubleTapTimer = null;// Find the last touched elementtarget = point.target;while (target.nodeType != 1) target = target.parentNode;if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {ev = document.createEvent('MouseEvents');ev.initMouseEvent('click', true, true, e.view, 1,point.screenX, point.screenY, point.clientX, point.clientY,e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,0, null);ev._fake = true;target.dispatchEvent(ev);}}, that.options.zoom ? 250 : 0);}}that._resetPos(200);if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);return;}if (duration < 300 && that.options.momentum) {momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;newPosX = that.x + momentumX.dist;newPosY = that.y + momentumY.dist;if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 };if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 };}if (momentumX.dist || momentumY.dist) {newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);// Do we need to snap?if (that.options.snap) {distX = newPosX - that.absStartX;distY = newPosY - that.absStartY;if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); }else {snap = that._snap(newPosX, newPosY);newPosX = snap.x;newPosY = snap.y;newDuration = m.max(snap.time, newDuration);}}that.scrollTo(newPosX, newPosY, newDuration);if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);return;}// Do we need to snap?if (that.options.snap) {distX = newPosX - that.absStartX;distY = newPosY - that.absStartY;if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);else {snap = that._snap(that.x, that.y);if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);}if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);return;}that._resetPos(200);if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);},_resetPos: function (time) {var that = this,resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;if (resetX == that.x && resetY == that.y) {if (that.moved) {that.moved = false;if (that.options.onScrollEnd) that.options.onScrollEnd.call(that); // Execute custom code on scroll end}if (that.hScrollbar && that.options.hideScrollbar) {if (vendor == 'webkit') that.hScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';that.hScrollbarWrapper.style.opacity = '0';}if (that.vScrollbar && that.options.hideScrollbar) {if (vendor == 'webkit') that.vScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';that.vScrollbarWrapper.style.opacity = '0';}return;}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();},/***** Utilities**/_startAni: function () {var that = this,startX = that.x, startY = that.y,startTime = (new Date).getTime(),step, easeOut;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;}(function animate () {var now = (new Date).getTime(),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); // Execute custom code on animation endthat._startAni();return;}now = (now - startTime) / step.time - 1;easeOut = m.sqrt(1 - now * now);newX = (step.x - startX) * easeOut + startX;newY = (step.y - startY) * easeOut + startY;that._pos(newX, newY);if (that.animating) that.aniTime = nextFrame(animate);})();},_transitionTime: function (time) {time += 'ms';this.scroller.style[vendor + 'TransitionDuration'] = time;if (this.hScrollbar) this.hScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;if (this.vScrollbar) this.vScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;},_momentum: function (dist, time, maxDistUpper, maxDistLower, size) {var deceleration = 0.0006,speed = m.abs(dist) / time,newDist = (speed * speed) / (2 * deceleration),newTime = 0, outsideDist = 0;// Proportinally reduce speed if we are outside of the boundaries if (dist > 0 && newDist > maxDistUpper) {outsideDist = size / (6 / (newDist / speed * deceleration));maxDistUpper = maxDistUpper + outsideDist;speed = speed * maxDistUpper / newDist;newDist = maxDistUpper;} else if (dist < 0 && newDist > maxDistLower) {outsideDist = size / (6 / (newDist / speed * deceleration));maxDistLower = maxDistLower + outsideDist;speed = speed * maxDistLower / newDist;newDist = maxDistLower;}newDist = newDist * (dist < 0 ? -1 : 1);newTime = speed / deceleration;return { dist: newDist, time: m.round(newTime) };},_offset: function (el) {var left = -el.offsetLeft,top = -el.offsetTop;while (el = el.offsetParent) {left -= el.offsetLeft;top -= el.offsetTop;}if (el != this.wrapper) {left *= this.scale;top *= this.scale;}return { left: left, top: top };},_snap: function (x, y) {var that = this,i, l,page, time,sizeX, sizeY;// Check page Xpage = that.pagesX.length - 1;for (i=0, l=that.pagesX.length; i<l; i++) {if (x >= that.pagesX[i]) {page = i;break;}}if (page == that.currPageX && page > 0 && that.dirX < 0) page--;x = that.pagesX[page];sizeX = m.abs(x - that.pagesX[that.currPageX]);sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;that.currPageX = page;// Check page Ypage = that.pagesY.length-1;for (i=0; i<page; i++) {if (y >= that.pagesY[i]) {page = i;break;}}if (page == that.currPageY && page > 0 && that.dirY < 0) page--;y = that.pagesY[page];sizeY = m.abs(y - that.pagesY[that.currPageY]);sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;that.currPageY = page;// Snap with constant speed (proportional duration)time = m.round(m.max(sizeX, sizeY)) || 200;return { x: x, y: y, time: time };},_bind: function (type, el, bubble) {(el || this.scroller).addEventListener(type, this, !!bubble);},_unbind: function (type, el, bubble) {(el || this.scroller).removeEventListener(type, this, !!bubble);},/***** Public methods**/destroy: function () {var that = this;that.scroller.style[vendor + 'Transform'] = '';// Remove the scrollbarsthat.hScrollbar = false;that.vScrollbar = false;that._scrollbar('h');that._scrollbar('v');// Remove the event listenersthat._unbind(RESIZE_EV, window);that._unbind(START_EV);that._unbind(MOVE_EV);that._unbind(END_EV);that._unbind(CANCEL_EV);if (that.options.hasTouch) {that._unbind('mouseout', that.wrapper);that._unbind(WHEEL_EV);}if (that.options.useTransition) that._unbind('webkitTransitionEnd');if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);if (that.options.onDestroy) that.options.onDestroy.call(that);},refresh: function () {var that = this,offset,pos = 0,page = 0;if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;that.wrapperW = that.wrapper.clientWidth || 1;that.wrapperH = that.wrapper.clientHeight || 1;that.minScrollY = -that.options.topOffset || 0;that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale);that.maxScrollX = that.wrapperW - that.scrollerW;that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY;that.dirX = 0;that.dirY = 0;if (that.options.onRefresh) that.options.onRefresh.call(that);that.hScroll = that.options.hScroll && that.maxScrollX < 0;that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);that.hScrollbar = that.hScroll && that.options.hScrollbar;that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;offset = that._offset(that.wrapper);that.wrapperOffsetLeft = -offset.left;that.wrapperOffsetTop = -offset.top;// Prepare snapif (typeof that.options.snap == 'string') {that.pagesX = [];that.pagesY = [];els = that.scroller.querySelectorAll(that.options.snap);for (i=0, l=els.length; i<l; i++) {pos = that._offset(els[i]);pos.left += that.wrapperOffsetLeft;pos.top += that.wrapperOffsetTop;that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;}} else if (that.options.snap) {that.pagesX = [];while (pos >= that.maxScrollX) {that.pagesX[page] = pos;pos = pos - that.wrapperW;page++;}if (that.maxScrollX%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1];pos = 0;page = 0;that.pagesY = [];while (pos >= that.maxScrollY) {that.pagesY[page] = pos;pos = pos - that.wrapperH;page++;}if (that.maxScrollY%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1];}// Prepare the scrollbarsthat._scrollbar('h');that._scrollbar('v');if (!that.zoomed) {that.scroller.style[vendor + 'TransitionDuration'] = '0';that._resetPos(200);}},scrollTo: function (x, y, time, relative) {var that = this,step = x,i, l;that.stop();if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }];for (i=0, l=step.length; i<l; i++) {if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; }that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });}that._startAni();},scrollToElement: function (el, time) {var that = this, pos;el = el.nodeType ? el : that.scroller.querySelector(el);if (!el) return;pos = that._offset(el);pos.left += that.wrapperOffsetLeft;pos.top += that.wrapperOffsetTop;pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time;that.scrollTo(pos.left, pos.top, time);},scrollToPage: function (pageX, pageY, time) {var that = this, x, y;if (that.options.snap) {pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX;pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY;pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX;pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY;that.currPageX = pageX;that.currPageY = pageY;x = that.pagesX[pageX];y = that.pagesY[pageY];} else {x = -that.wrapperW * pageX;y = -that.wrapperH * pageY;if (x < that.maxScrollX) x = that.maxScrollX;if (y < that.maxScrollY) y = that.maxScrollY;}that.scrollTo(x, y, time || 400);},disable: function () {this.stop();this._resetPos(0);this.enabled = false;// If disabled after touchstart we make sure that there are no left over eventsthis._unbind(MOVE_EV);this._unbind(END_EV);this._unbind(CANCEL_EV);},enable: function () {this.enabled = true;},stop: function () {if (this.options.useTransition) this._unbind('webkitTransitionEnd');else cancelFrame(this.aniTime);this.steps = [];this.moved = false;this.animating = false;},zoom: function (x, y, scale, time) {var that = this,relScale = scale / that.scale;if (!that.options.useTransform) return;that.zoomed = true;time = time === undefined ? 200 : time;x = x - that.wrapperOffsetLeft - that.x;y = y - that.wrapperOffsetTop - that.y;that.x = x - x * relScale + that.x;that.y = y - y * relScale + that.y;that.scale = scale;that.refresh();that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;that.scroller.style[vendor + 'TransitionDuration'] = time + 'ms';that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + scale + ')';that.zoomed = false;},isReady: function () {return !this.moved && !this.zoomed && !this.animating;}
};if (typeof exports !== 'undefined') exports.iScroll = iScroll;
else window.iScroll = iScroll;})();
轉載于:https://www.cnblogs.com/kxdhm/archive/2012/02/21/2361750.html
與50位技術專家面對面20年技術見證，附贈技術全景圖總結
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