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+/**
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+ * 选择列表插件
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+ * varstion 2.0.0
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+ * by Houfeng
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+ * Houfeng@DCloud.io
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+ */
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+
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+(function($, window, document, undefined) {
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+
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+ var MAX_EXCEED = 30;
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+ var VISIBLE_RANGE = 90;
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+ var DEFAULT_ITEM_HEIGHT = 40;
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+ var BLUR_WIDTH = 10;
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+
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+ var rad2deg = $.rad2deg = function(rad) {
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+ return rad / (Math.PI / 180);
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+ };
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+
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+ var deg2rad = $.deg2rad = function(deg) {
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+ return deg * (Math.PI / 180);
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+ };
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+
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+ var platform = navigator.platform.toLowerCase();
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+ var userAgent = navigator.userAgent.toLowerCase();
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+ var isIos = (userAgent.indexOf('iphone') > -1 ||
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+ userAgent.indexOf('ipad') > -1 ||
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+ userAgent.indexOf('ipod') > -1) &&
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+ (platform.indexOf('iphone') > -1 ||
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+ platform.indexOf('ipad') > -1 ||
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+ platform.indexOf('ipod') > -1);
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+ //alert(isIos);
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+
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+ var Picker = $.Picker = function(holder, options) {
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+ var self = this;
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+ self.holder = holder;
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+ self.options = options || {};
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+ self.init();
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+ self.initInertiaParams();
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+ self.calcElementItemPostion(true);
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+ self.bindEvent();
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+ };
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+
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+ Picker.prototype.findElementItems = function() {
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+ var self = this;
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+ self.elementItems = [].slice.call(self.holder.querySelectorAll('li'));
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+ return self.elementItems;
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+ };
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+
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+ Picker.prototype.init = function() {
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+ var self = this;
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+ self.list = self.holder.querySelector('ul');
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+ self.findElementItems();
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+ self.height = self.holder.offsetHeight;
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+ self.r = self.height / 2 - BLUR_WIDTH;
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+ self.d = self.r * 2;
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+ self.itemHeight = self.elementItems.length > 0 ? self.elementItems[0].offsetHeight : DEFAULT_ITEM_HEIGHT;
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+ self.itemAngle = parseInt(self.calcAngle(self.itemHeight * 0.8));
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+ self.hightlightRange = self.itemAngle / 2;
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+ self.visibleRange = VISIBLE_RANGE;
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+ self.beginAngle = 0;
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+ self.beginExceed = self.beginAngle - MAX_EXCEED;
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+ self.list.angle = self.beginAngle;
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+ if (isIos) {
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+ self.list.style.webkitTransformOrigin = "center center " + self.r + "px";
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+ }
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+ };
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+
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+ Picker.prototype.calcElementItemPostion = function(andGenerateItms) {
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+ var self = this;
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+ if (andGenerateItms) {
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+ self.items = [];
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+ }
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+ self.elementItems.forEach(function(item) {
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+ var index = self.elementItems.indexOf(item);
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+ self.endAngle = self.itemAngle * index;
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+ item.angle = self.endAngle;
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+ item.style.webkitTransformOrigin = "center center -" + self.r + "px";
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+ item.style.webkitTransform = "translateZ(" + self.r + "px) rotateX(" + (-self.endAngle) + "deg)";
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+ if (andGenerateItms) {
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+ var dataItem = {};
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+ dataItem.text = item.innerHTML || '';
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+ dataItem.value = item.getAttribute('data-value') || dataItem.text;
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+ self.items.push(dataItem);
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+ }
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+ });
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+ self.endExceed = self.endAngle + MAX_EXCEED;
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+ self.calcElementItemVisibility(self.beginAngle);
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+ };
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+
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+ Picker.prototype.calcAngle = function(c) {
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+ var self = this;
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+ var a = b = parseFloat(self.r);
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+ //直径的整倍数部分直接乘以 180
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+ c = Math.abs(c); //只算角度不关心正否值
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+ var intDeg = parseInt(c / self.d) * 180;
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+ c = c % self.d;
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+ //余弦
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+ var cosC = (a * a + b * b - c * c) / (2 * a * b);
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+ var angleC = intDeg + rad2deg(Math.acos(cosC));
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+ return angleC;
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+ };
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+
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+ Picker.prototype.calcElementItemVisibility = function(angle) {
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+ var self = this;
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+ self.elementItems.forEach(function(item) {
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+ var difference = Math.abs(item.angle - angle);
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+ if (difference < self.hightlightRange) {
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+ item.classList.add('highlight');
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+ } else if (difference < self.visibleRange) {
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+ item.classList.add('visible');
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+ item.classList.remove('highlight');
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+ } else {
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+ item.classList.remove('highlight');
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+ item.classList.remove('visible');
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+ }
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+ });
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+ };
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+
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+ Picker.prototype.setAngle = function(angle) {
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+ var self = this;
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+ self.list.angle = angle;
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+ self.list.style.webkitTransform = "perspective(1000px) rotateY(0deg) rotateX(" + angle + "deg)";
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+ self.calcElementItemVisibility(angle);
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+ };
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+
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+ Picker.prototype.bindEvent = function() {
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+ var self = this;
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+ var lastAngle = 0;
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+ var startY = null;
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+ var isPicking = false;
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+ self.holder.addEventListener($.EVENT_START, function(event) {
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+ isPicking = true;
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+ event.preventDefault();
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+ self.list.style.webkitTransition = '';
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+ startY = (event.changedTouches ? event.changedTouches[0] : event).pageY;
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+ lastAngle = self.list.angle;
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+ self.updateInertiaParams(event, true);
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+ }, false);
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+ self.holder.addEventListener($.EVENT_END, function(event) {
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+ isPicking = false;
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+ event.preventDefault();
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+ self.startInertiaScroll(event);
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+ }, false);
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+ self.holder.addEventListener($.EVENT_CANCEL, function(event) {
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+ isPicking = false;
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+ event.preventDefault();
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+ self.startInertiaScroll(event);
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+ }, false);
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+ self.holder.addEventListener($.EVENT_MOVE, function(event) {
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+ if (!isPicking) {
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+ return;
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+ }
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+ event.preventDefault();
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+ var endY = (event.changedTouches ? event.changedTouches[0] : event).pageY;
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+ var dragRange = endY - startY;
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+ var dragAngle = self.calcAngle(dragRange);
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+ var newAngle = dragRange > 0 ? lastAngle - dragAngle : lastAngle + dragAngle;
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+ if (newAngle > self.endExceed) {
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+ newAngle = self.endExceed
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+ }
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+ if (newAngle < self.beginExceed) {
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+ newAngle = self.beginExceed
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+ }
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+ self.setAngle(newAngle);
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+ self.updateInertiaParams(event);
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+ }, false);
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+ //--
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+ self.list.addEventListener('tap', function(event) {
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+ elementItem = event.target;
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+ if (elementItem.tagName == 'LI') {
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+ self.setSelectedIndex(self.elementItems.indexOf(elementItem), 200);
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+ }
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+ }, false);
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+ };
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+
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+ Picker.prototype.initInertiaParams = function() {
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+ var self = this;
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+ self.lastMoveTime = 0;
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+ self.lastMoveStart = 0;
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+ self.stopInertiaMove = false;
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+ };
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+
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+ Picker.prototype.updateInertiaParams = function(event, isStart) {
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+ var self = this;
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+ var point = event.changedTouches ? event.changedTouches[0] : event;
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+ if (isStart) {
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+ self.lastMoveStart = point.pageY;
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+ self.lastMoveTime = event.timeStamp || Date.now();
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+ self.startAngle = self.list.angle;
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+ } else {
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+ var nowTime = event.timeStamp || Date.now();
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+ if (nowTime - self.lastMoveTime > 300) {
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+ self.lastMoveTime = nowTime;
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+ self.lastMoveStart = point.pageY;
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+ }
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+ }
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+ self.stopInertiaMove = true;
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+ };
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+
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+ Picker.prototype.startInertiaScroll = function(event) {
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+ var self = this;
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+ var point = event.changedTouches ? event.changedTouches[0] : event;
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+ /**
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+ * 缓动代码
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+ */
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+ var nowTime = event.timeStamp || Date.now();
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+ var v = (point.pageY - self.lastMoveStart) / (nowTime - self.lastMoveTime); //最后一段时间手指划动速度
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+ var dir = v > 0 ? -1 : 1; //加速度方向
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+ var deceleration = dir * 0.0006 * -1;
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+ var duration = Math.abs(v / deceleration); // 速度消减至0所需时间
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+ var dist = v * duration / 2; //最终移动多少
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+ var startAngle = self.list.angle;
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+ var distAngle = self.calcAngle(dist) * dir;
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+ //----
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+ var srcDistAngle = distAngle;
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+ if (startAngle + distAngle < self.beginExceed) {
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+ distAngle = self.beginExceed - startAngle;
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+ duration = duration * (distAngle / srcDistAngle) * 0.6;
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+ }
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+ if (startAngle + distAngle > self.endExceed) {
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+ distAngle = self.endExceed - startAngle;
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+ duration = duration * (distAngle / srcDistAngle) * 0.6;
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+ }
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+ //----
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+ if (distAngle == 0) {
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+ self.endScroll();
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+ return;
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+ }
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+ self.scrollDistAngle(nowTime, startAngle, distAngle, duration);
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+ };
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+
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+ Picker.prototype.scrollDistAngle = function(nowTime, startAngle, distAngle, duration) {
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+ var self = this;
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+ self.stopInertiaMove = false;
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+ (function(nowTime, startAngle, distAngle, duration) {
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+ var frameInterval = 13;
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+ var stepCount = duration / frameInterval;
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+ var stepIndex = 0;
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+ (function inertiaMove() {
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+ if (self.stopInertiaMove) return;
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+ var newAngle = self.quartEaseOut(stepIndex, startAngle, distAngle, stepCount);
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+ self.setAngle(newAngle);
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+ stepIndex++;
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+ if (stepIndex > stepCount - 1 || newAngle < self.beginExceed || newAngle > self.endExceed) {
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+ self.endScroll();
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+ return;
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+ }
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+ setTimeout(inertiaMove, frameInterval);
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+ })();
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+ })(nowTime, startAngle, distAngle, duration);
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+ };
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+
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+ Picker.prototype.quartEaseOut = function(t, b, c, d) {
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+ return -c * ((t = t / d - 1) * t * t * t - 1) + b;
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+ };
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+
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+ Picker.prototype.endScroll = function() {
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+ var self = this;
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+ if (self.list.angle < self.beginAngle) {
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+ self.list.style.webkitTransition = "150ms ease-out";
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+ self.setAngle(self.beginAngle);
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+ } else if (self.list.angle > self.endAngle) {
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+ self.list.style.webkitTransition = "150ms ease-out";
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+ self.setAngle(self.endAngle);
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+ } else {
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+ var index = parseInt((self.list.angle / self.itemAngle).toFixed(0));
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+ self.list.style.webkitTransition = "100ms ease-out";
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+ self.setAngle(self.itemAngle * index);
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+ }
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+ self.triggerChange();
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+ };
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+
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+ Picker.prototype.triggerChange = function(force) {
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+ var self = this;
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+ setTimeout(function() {
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+ var index = self.getSelectedIndex();
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+ var item = self.items[index];
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+ if ($.trigger && (index != self.lastIndex || force === true)) {
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+ $.trigger(self.holder, 'change', {
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+ "index": index,
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+ "item": item
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+ });
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+ //console.log('change:' + index);
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+ }
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+ self.lastIndex = index;
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+ typeof force === 'function' && force();
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+ }, 0);
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+ };
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+
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+ Picker.prototype.correctAngle = function(angle) {
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+ var self = this;
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+ if (angle < self.beginAngle) {
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+ return self.beginAngle;
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+ } else if (angle > self.endAngle) {
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+ return self.endAngle;
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+ } else {
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+ return angle;
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+ }
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+ };
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+
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+ Picker.prototype.setItems = function(items) {
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+ var self = this;
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+ self.items = items || [];
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+ var buffer = [];
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305
|
+ self.items.forEach(function(item) {
|
|
|
306
|
+ if (item !== null && item !== undefined) {
|
|
|
307
|
+ buffer.push('<li>' + (item.text || item) + '</li>');
|
|
|
308
|
+ }
|
|
|
309
|
+ });
|
|
|
310
|
+ self.list.innerHTML = buffer.join('');
|
|
|
311
|
+ self.findElementItems();
|
|
|
312
|
+ self.calcElementItemPostion();
|
|
|
313
|
+ self.setAngle(self.correctAngle(self.list.angle));
|
|
|
314
|
+ self.triggerChange(true);
|
|
|
315
|
+ };
|
|
|
316
|
+
|
|
|
317
|
+ Picker.prototype.getItems = function() {
|
|
|
318
|
+ var self = this;
|
|
|
319
|
+ return self.items;
|
|
|
320
|
+ };
|
|
|
321
|
+
|
|
|
322
|
+ Picker.prototype.getSelectedIndex = function() {
|
|
|
323
|
+ var self = this;
|
|
|
324
|
+ return parseInt((self.list.angle / self.itemAngle).toFixed(0));
|
|
|
325
|
+ };
|
|
|
326
|
+
|
|
|
327
|
+ Picker.prototype.setSelectedIndex = function(index, duration, callback) {
|
|
|
328
|
+ var self = this;
|
|
|
329
|
+ self.list.style.webkitTransition = '';
|
|
|
330
|
+ var angle = self.correctAngle(self.itemAngle * index);
|
|
|
331
|
+ if (duration && duration > 0) {
|
|
|
332
|
+ var distAngle = angle - self.list.angle;
|
|
|
333
|
+ self.scrollDistAngle(Date.now(), self.list.angle, distAngle, duration);
|
|
|
334
|
+ } else {
|
|
|
335
|
+ self.setAngle(angle);
|
|
|
336
|
+ }
|
|
|
337
|
+ self.triggerChange(callback);
|
|
|
338
|
+ };
|
|
|
339
|
+
|
|
|
340
|
+ Picker.prototype.getSelectedItem = function() {
|
|
|
341
|
+ var self = this;
|
|
|
342
|
+ return self.items[self.getSelectedIndex()];
|
|
|
343
|
+ };
|
|
|
344
|
+
|
|
|
345
|
+ Picker.prototype.getSelectedValue = function() {
|
|
|
346
|
+ var self = this;
|
|
|
347
|
+ return (self.items[self.getSelectedIndex()] || {}).value;
|
|
|
348
|
+ };
|
|
|
349
|
+
|
|
|
350
|
+ Picker.prototype.getSelectedText = function() {
|
|
|
351
|
+ var self = this;
|
|
|
352
|
+ return (self.items[self.getSelectedIndex()] || {}).text;
|
|
|
353
|
+ };
|
|
|
354
|
+
|
|
|
355
|
+ Picker.prototype.setSelectedValue = function(value, duration, callback) {
|
|
|
356
|
+ var self = this;
|
|
|
357
|
+ for (var index in self.items) {
|
|
|
358
|
+ var item = self.items[index];
|
|
|
359
|
+ if (item.value == value) {
|
|
|
360
|
+ self.setSelectedIndex(index, duration, callback);
|
|
|
361
|
+ return;
|
|
|
362
|
+ }
|
|
|
363
|
+ }
|
|
|
364
|
+ };
|
|
|
365
|
+
|
|
|
366
|
+ if ($.fn) {
|
|
|
367
|
+ $.fn.picker = function(options) {
|
|
|
368
|
+ //遍历选择的元素
|
|
|
369
|
+ this.each(function(i, element) {
|
|
|
370
|
+ if (element.picker) return;
|
|
|
371
|
+ if (options) {
|
|
|
372
|
+ element.picker = new Picker(element, options);
|
|
|
373
|
+ } else {
|
|
|
374
|
+ var optionsText = element.getAttribute('data-picker-options');
|
|
|
375
|
+ var _options = optionsText ? JSON.parse(optionsText) : {};
|
|
|
376
|
+ element.picker = new Picker(element, _options);
|
|
|
377
|
+ }
|
|
|
378
|
+ });
|
|
|
379
|
+ return this[0] ? this[0].picker : null;
|
|
|
380
|
+ };
|
|
|
381
|
+
|
|
|
382
|
+ //自动初始化
|
|
|
383
|
+ $.ready(function() {
|
|
|
384
|
+ $('.mui-picker').picker();
|
|
|
385
|
+ });
|
|
|
386
|
+ }
|
|
|
387
|
+
|
|
|
388
|
+})(window.mui || window, window, document, undefined);
|
|
|
389
|
+//end
|