267 lines
7.8 KiB
JavaScript
267 lines
7.8 KiB
JavaScript
class PreviewImage {
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// 属性都是全局的
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body = this.$("body");
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option = {};
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isBackMove = false;
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x1 = 0;
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y1 = 0;
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l = 0;
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t = 0;
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constructor(option) {
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if (!option.hasOwnProperty("image")) {
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throw new Error("参数image缺少，请检查")
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}
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if (!option.hasOwnProperty("showIndex")) {
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throw new Error("参数showIndex缺少，请检查")
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}
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this.option = option
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console.log(this.option);
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this.created();
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this.BindClose();
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this.BindPrevious();
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this.BindNext();
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this.BindSuoXiao();
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this.BindFangDa();
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this.BindFullScreen();
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this.BindXuanZhuan();
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this.MouseEvent();
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}
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// 1：把图片预览的html插入到网页上
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created() {
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this.body.insertAdjacentHTML("beforeend", `<div class="previewImage">
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<div class="zhezhao"></div>
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<div class="preview">
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<div class="closed">x</div>
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<div class="action">
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<div class="left d"><</div>
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<div class="right d">></div>
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</div>
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<img class="mainImg" style="transform: scale(1) rotate(0deg);margin-left: 0;margin-top: 0;"
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src="${this.option.image[this.option.showIndex]}" alt="">
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<ul class="operation">
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<li>
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<i class="iconfont icon-suoxiao suoxiao"></i>
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</li>
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<li>
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<i class="iconfont icon-fangda fangda"></i>
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</li>
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<li>
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<i class="iconfont icon-fullscreen fullscreen"></i>
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</li>
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<li class="xz">
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<i class="iconfont icon-shuaxin leftshuaxin"></i>
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</li>
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<li>
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<i class="iconfont icon-shuaxin rightshuaxin"></i>
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</li>
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</ul>
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</div>
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</div>`)
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}
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// 缩小
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BindSuoXiao() {
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this.$(".suoxiao").onclick = () => {
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var value = this.Scale() - 0.2;
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if (value != 0) {
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this.$(".mainImg").style.transform = `scale(${value}) rotate(${this.Rotate()}deg)`
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}
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}
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}
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// 全屏
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BindFullScreen() {
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this.$(".fullscreen").onclick = () => {
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// true 缩小
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if (this.$(".fullscreen").classList.contains("icon-fullscreen")) {
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this.$(".fullscreen").classList.remove("icon-fullscreen")
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this.$(".fullscreen").classList.add("icon-suoxiao1")
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this.$(".mainImg").style = `
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transform: scale(2) rotate(${this.Rotate()}deg);
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margin-left: 0;
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margin-top: 0;
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`
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// 放大
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} else {
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this.$(".fullscreen").classList.remove("icon-suoxiao1")
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this.$(".fullscreen").classList.add("icon-fullscreen")
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this.$(".mainImg").style = `
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transform: scale(1) rotate(0deg);
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margin-left: 0;
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margin-top: 0;
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`
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}
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}
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}
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// 放大
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BindFangDa() {
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this.$(".fangda").onclick = () => {
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this.$(".mainImg").style.transform = `scale(${this.Scale() + 0.2}) rotate(${this.Rotate()}deg)`
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}
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}
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// 旋转
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BindXuanZhuan() {
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// -90
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this.$(".leftshuaxin").onclick = () => {
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this.xuanzhuan(-90)
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}
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// +90
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this.$(".rightshuaxin").onclick = () => {
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this.xuanzhuan(90)
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}
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}
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MouseEvent() {
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// 鼠标滑动的时候放大缩小网页
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document.onmousewheel = (e) => {
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if (e.wheelDelta == 210) {
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this.$(".fangda").onclick()
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} else {
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this.$(".suoxiao").onclick()
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}
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}
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// document.addEventListener('mousewheel',(e) => {
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// if (e.wheelDelta == 210) {
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// this.$(".fangda").onclick()
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// } else {
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// this.$(".suoxiao").onclick()
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// }
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// },false)
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// 鼠标在图片上按下的时候
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this.$(".mainImg").onmousedown = (e) => {
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e.preventDefault()
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this.isBackMove = true
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//获取鼠标按下的坐标
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this.x1 = e.clientX;
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this.y1 = e.clientY;
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this.l = parseInt(this.$(".mainImg").style.marginLeft);
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this.t = this.$(".mainImg").offsetTop;
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this.ImgMove(".mainImg")
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}
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// 按住拖动，但鼠标从图片上离开的
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// 给背景层绑定鼠标移动事件
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this.$(".mainImg").onmouseleave = () => {
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console.log("鼠标从图片上离开的，给背景层绑定鼠标移动事件");
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if (this.isBackMove) {
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this.ImgMove(".preview")
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}
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}
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// 鼠标在背景层上松开
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this.$(".preview").onmouseup = (ev) => {
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console.log("鼠标在背景层上松开");
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this.isBackMove = false
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this.$(".mainImg").onmousemove = null;
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this.$(".preview").onmousemove = null;
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}
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// 鼠标在图片上松开
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this.$(".mainImg").onmouseup = (ev) => {
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console.log("鼠标在图片上松开");
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this.$(".mainImg").onmousemove = null;
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this.$(".preview").onmousemove = null;
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}
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}
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ImgMove(className) {
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this.$(className).onmousemove = (ev) => {
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var x2 = ev.clientX;
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var y2 = ev.clientY;
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//计算出鼠标的移动距离
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var x = x2 - this.x1;
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var y = y2 - this.y1;
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//移动的数值与元素的left，top相加，得出元素的移动的距离
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var lt = y + this.t;
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var ls = x + this.l;
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//更改元素的left，top值
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this.$(".mainImg").style.marginLeft = ls + 'px';
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this.$(".mainImg").style.marginTop = lt + 'px';
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}
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}
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xuanzhuan(offset) {
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this.$(".mainImg").style.transform = `scale(${this.Scale()}) rotate(${this.Rotate() + offset}deg)`
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}
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// 关闭按钮
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BindClose() {
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//1 var ddddc = this;
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//2 es6 => 箭头函数
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console.log("this1: ", this);
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// this 指向
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this.$(".closed").onclick = () => {
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this.body.removeChild(this.$(".previewImage"))
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}
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}
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// 上一页
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BindPrevious() {
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this.$(".left").onclick = () => {
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this.option.showIndex -= 1;
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if (this.option.showIndex < 0) {
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this.option.showIndex = this.option.image.length - 1
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}
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this.$(".mainImg").src = this.option.image[this.option.showIndex]
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}
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}
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// 下一页
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BindNext() {
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this.$(".right").onclick = () => {
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this.option.showIndex += 1;
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if (this.option.showIndex > this.option.image.length - 1) {
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this.option.showIndex = 0
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}
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this.$(".mainImg").src = this.option.image[this.option.showIndex]
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}
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}
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Scale() {
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return Number(this.$(".mainImg").style.transform.match(/scale\(([\s\S]*?)\) /)[1])
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}
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Rotate() {
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return Number(this.$(".mainImg").style.transform.match(/rotate\(([\s\S]*?)deg\)/)[1])
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}
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$(className) {
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return document.querySelector(className)
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}
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} |