/**
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* 图片预览组件
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* varstion 0.4.0
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* by Houfeng
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* Houfeng@DCloud.io
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*/
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(function($, document) {
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$.init({
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gestureConfig: {
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tap: true, //默认为true
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doubletap: true, //默认为false
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longtap: true, //默认为false
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swipe: true, //默认为true
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drag: true, //默认为true
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hold: true, //默认为false，不监听
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release: true //默认为false，不监听
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}
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});
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var touchSupport = ('ontouchstart' in document);
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var tapEventName = touchSupport ? 'tap' : 'click';
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var enterEventName = touchSupport ? 'tap' : 'click';
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var imageClassName = $.className('image');
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//创建DOM (此函数是否可放在 mui.js 中)
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$.dom = function(str) {
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if (!$.__create_dom_div__) {
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$.__create_dom_div__ = document.createElement('div');
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}
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$.__create_dom_div__.innerHTML = str;
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return $.__create_dom_div__.childNodes;
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};
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//图片预览组件类
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var ImageViewer = $.ImageViewer = $.Class.extend({
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//构造函数
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init: function(selector, options) {
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var self = this;
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self.options = options || {};
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self.selector = selector || 'img';
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if (self.options.dbl) {
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enterEventName = touchSupport ? 'doubletap' : 'dblclick';
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}
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self.findAllImage();
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self.createViewer();
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self.bindEvent();
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},
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//创建图片预览组件的整体 UI
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createViewer: function() {
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var self = this;
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self.viewer = $.dom("<div class='mui-imageviewer'><div class='mui-imageviewer-mask'></div><div class='mui-imageviewer-header'><i class='mui-icon mui-icon-closeempty mui-imageviewer-close'></i><span class='mui-imageviewer-state'></span></div><i class='mui-icon mui-icon-arrowleft mui-imageviewer-left'></i><i class='mui-icon mui-icon-arrowright mui-imageviewer-right'></i></div>");
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self.viewer = self.viewer[0] || self.viewer;
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//self.viewer.style.height = screen.height;
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self.closeButton = self.viewer.querySelector('.mui-imageviewer-close');
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self.state = self.viewer.querySelector('.mui-imageviewer-state');
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self.leftButton = self.viewer.querySelector('.mui-imageviewer-left');
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self.rightButton = self.viewer.querySelector('.mui-imageviewer-right');
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self.mask = self.viewer.querySelector('.mui-imageviewer-mask');
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document.body.appendChild(self.viewer);
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},
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//查找所有符合的图片
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findAllImage: function() {
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var self = this;
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self.images = [].slice.call($(self.selector));
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},
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//检查图片是否为启动预览的图片
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checkImage: function(target) {
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var self = this;
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if (target.tagName !== 'IMG') return false;
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return self.images.some(function(image) {
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return image == target;
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});
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},
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//绑定事件
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bindEvent: function() {
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var self = this;
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//绑定图片 tap 事件
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document.addEventListener(enterEventName, function(event) {
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if (!self.viewer) return;
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var target = event.target;
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if (!self.checkImage(target)) return;
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self.viewer.style.display = 'block';
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setTimeout(function() {
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self.viewer.style.opacity = 1;
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}, 0);
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self.index = self.images.indexOf(target);
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self.currentItem = self.createImage(self.index);
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}, false);
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//关系按钮事件
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self.closeButton.addEventListener(tapEventName, function(event) {
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self.viewer.style.opacity = 0;
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setTimeout(function() {
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self.viewer.style.display = 'none';
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self.disposeImage(true);
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}, 600);
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event.preventDefault();
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event.cancelBubble = true;
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}, false);
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//处理左右按钮
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self.leftButton.addEventListener(tapEventName, function() {
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self.prev();
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}, false);
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self.rightButton.addEventListener(tapEventName, function() {
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self.next();
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}, false);
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//处理划动
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self.mask.addEventListener('touchmove', function(event) {
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event.preventDefault();
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event.cancelBubble = true;
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}, false);
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self.viewer.addEventListener('swipeleft', function(event) {
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if (self.scaleValue == 1) self.next();
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event.preventDefault();
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event.cancelBubble = true;
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}, false);
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self.viewer.addEventListener('swiperight', function(event) {
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if (self.scaleValue == 1) self.prev();
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event.preventDefault();
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event.cancelBubble = true;
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}, false);
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//处理缩放开始
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self.viewer.addEventListener('touchstart', function(event) {
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var touches = event.touches;
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if (touches.length == 2) {
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var p1 = touches[0];
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var p2 = touches[1];
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var x = p1.pageX - p2.pageX; //x1-x2
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var y = p1.pageY - p2.pageY; //y1-y2
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self.scaleStart = Math.sqrt(x * x + y * y);
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self.isMultiTouch = true;
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} else if (touches.length = 1) {
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self.dragStart = touches[0];
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}
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}, false);
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self.viewer.addEventListener('touchmove', function(event) {
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var img = self.currentItem.querySelector('img');
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var touches = event.changedTouches;
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if (touches.length == 2) {
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event.preventDefault();
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event.cancelBubble = true;
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var p1 = touches[0];
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var p2 = touches[1];
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var x = p1.pageX - p2.pageX;
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var y = p1.pageY - p2.pageY;
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self.scaleEnd = Math.sqrt(x * x + y * y);
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self._scaleValue = (self.scaleValue * (self.scaleEnd / self.scaleStart));
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//self.state.innerText = self._scaleValue;
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img.style.webkitTransform = "scale(" + self._scaleValue + "," + self._scaleValue + ") "; // + " translate(" + self.dragX || 0 + "px," + self.dragY || 0 + "px)";
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} else if (!self.isMultiTouch && touches.length == 1 && self.scaleValue != 1) {
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event.preventDefault();
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event.cancelBubble = true;
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self.dragEnd = touches[0];
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self._dragX = self.dragX + (self.dragEnd.pageX - self.dragStart.pageX);
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self._dragY = self.dragY + (self.dragEnd.pageY - self.dragStart.pageY);
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img.style.marginLeft = self._dragX + 'px';
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img.style.marginTop = self._dragY + 'px';
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//img.style.transform = "translate(" + self._dragX + "px," + self._dragY + "px) " + " scale(" + self.scaleValue || 1 + "," + self.scaleValue || 1 + ")";
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}
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}, false);
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self.viewer.addEventListener('touchend', function() {
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self.scaleValue = self._scaleValue || self.scaleValue;
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self._scaleValue = null;
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self.dragX = self._dragX;
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self.dragY = self._dragY;
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self._dragX = null;
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self._dragY = null;
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var touches = event.touches;
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self.isMultiTouch = (touches.length != 0);
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});
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// doubletap 好像不能用
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self.viewer.addEventListener('doubletap', function() {
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var img = self.currentItem.querySelector('img');
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if (self.scaleValue === 1) {
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self.scaleValue = 2;
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} else {
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self.scaleValue = 1;
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}
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self.dragX = 0;
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self.dragY = 0;
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img.style.marginLeft = self.dragX + 'px';
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img.style.marginTop = self.dragY + 'px';
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img.style.webkitTransform = "scale(" + self.scaleValue + "," + self.scaleValue + ") "; //+ " translate(" + self.dragX || 0 + "px," + self.dragY || 0 + "px)";
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self.viewer.__tap_num = 0;
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}, false);
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//处理缩放结束
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},
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//下一张图片
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next: function() {
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var self = this;
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self.mask.style.display = 'block';
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self.index++;
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var newItem = self.createImage(self.index, 'right');
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setTimeout(function() {
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self.currentItem.classList.remove('mui-imageviewer-item-center');
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self.currentItem.classList.add('mui-imageviewer-item-left');
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newItem.classList.remove('mui-imageviewer-item-right');
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newItem.classList.add('mui-imageviewer-item-center');
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self.oldItem = self.currentItem;
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self.currentItem = newItem;
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// TODO: 临时,稍候将调整
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setTimeout(function() {
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self.disposeImage();
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self.mask.style.display = 'none';
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}, 600);
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}, 25);
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},
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//上一张图片
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prev: function() {
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var self = this;
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self.mask.style.display = 'block';
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self.index--;
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var newItem = self.createImage(self.index, 'left');
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setTimeout(function() {
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self.currentItem.classList.remove('mui-imageviewer-item-center');
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self.currentItem.classList.add('mui-imageviewer-item-right');
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newItem.classList.remove('mui-imageviewer-item-left');
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newItem.classList.add('mui-imageviewer-item-center');
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self.oldItem = self.currentItem;
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self.currentItem = newItem;
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// TODO: 临时,稍候将调整
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setTimeout(function() {
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self.disposeImage();
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self.mask.style.display = 'none';
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}, 600);
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}, 25);
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},
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//释放不显示的图片
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disposeImage: function(all) {
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var sel = '.mui-imageviewer-item-left,.mui-imageviewer-item-right';
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if (all) sel += ",.mui-imageviewer-item";
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var willdisposes = $(sel);
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willdisposes.each(function(i, item) {
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if (item.parentNode && item.parentNode.removeChild)
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item.parentNode.removeChild(item, true);
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});
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},
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//创建一个图片
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createImage: function(index, type) {
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var self = this;
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type = type || 'center';
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if (index < 0) index = self.images.length - 1;
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if (index > self.images.length - 1) index = 0;
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self.index = index;
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var item = $.dom("<div class='mui-imageviewer-item'></div>")[0];
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item.appendChild($.dom('<span><img src="' + self.images[self.index].src + '"/></span>')[0]);
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item.classList.add('mui-imageviewer-item-' + type);
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self.viewer.appendChild(item);
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self.state.innerText = (self.index + 1) + "/" + self.images.length;
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//重置初始缩放比例
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self.scaleValue = 1;
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self.dragX = 0;
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self.dragY = 0;
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return item;
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}
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});
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$.imageViewer = function(selector, options) {
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return new ImageViewer(selector, options);
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};
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$.ready(function() {
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$.imageViewer('.' + imageClassName);
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});
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}(mui, document));
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