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编码猿
2024-09-27 02:06:13 +08:00
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历届学生/吴欣阳/项目开发/上课项目/美食app/front/js/lib/previewImage.js Normal file
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class PreviewImage {
// 属性都是全局的
body = this.$("body");
option = {};
isBackMove = false;
x1 = 0;
y1 = 0;
l = 0;
t = 0;
constructor(option) {
if (!option.hasOwnProperty("image")) {
throw new Error("参数image缺少，请检查")
}
if (!option.hasOwnProperty("showIndex")) {
throw new Error("参数showIndex缺少，请检查")
}
this.option = option
console.log(this.option);
this.created();
this.BindClose();
this.BindPrevious();
this.BindNext();
this.BindSuoXiao();
this.BindFangDa();
this.BindFullScreen();
this.BindXuanZhuan();
this.MouseEvent();
}
// 1：把图片预览的html插入到网页上
created() {
this.body.insertAdjacentHTML("beforeend", `<div class="previewImage">
<div class="zhezhao"></div>
<div class="preview">
<div class="closed">x</div>
<div class="action">
<div class="left d">&lt;</div>
<div class="right d">&gt;</div>
</div>
<img class="mainImg" style="transform: scale(1) rotate(0deg);margin-left: 0;margin-top: 0;"
src="${this.option.image[this.option.showIndex]}" alt="">
<ul class="operation">
<li>
<i class="iconfont icon-suoxiao suoxiao"></i>
</li>
<li>
<i class="iconfont icon-fangda fangda"></i>
</li>
<li>
<i class="iconfont icon-fullscreen fullscreen"></i>
</li>
<li class="xz">
<i class="iconfont icon-shuaxin leftshuaxin"></i>
</li>
<li>
<i class="iconfont icon-shuaxin rightshuaxin"></i>
</li>
</ul>
</div>
</div>`)
}
// 缩小
BindSuoXiao() {
this.$(".suoxiao").onclick = () => {
var value = this.Scale() - 0.2;
if (value != 0) {
this.$(".mainImg").style.transform = `scale(${value}) rotate(${this.Rotate()}deg)`
}
}
}
// 全屏
BindFullScreen() {
this.$(".fullscreen").onclick = () => {
// true 缩小
if (this.$(".fullscreen").classList.contains("icon-fullscreen")) {
this.$(".fullscreen").classList.remove("icon-fullscreen")
this.$(".fullscreen").classList.add("icon-suoxiao1")
this.$(".mainImg").style = `
transform: scale(2) rotate(${this.Rotate()}deg);
margin-left: 0;
margin-top: 0;
`
// 放大
} else {
this.$(".fullscreen").classList.remove("icon-suoxiao1")
this.$(".fullscreen").classList.add("icon-fullscreen")
this.$(".mainImg").style = `
transform: scale(1) rotate(0deg);
margin-left: 0;
margin-top: 0;
`
}
}
}
// 放大
BindFangDa() {
this.$(".fangda").onclick = () => {
this.$(".mainImg").style.transform = `scale(${this.Scale() + 0.2}) rotate(${this.Rotate()}deg)`
}
}
// 旋转
BindXuanZhuan() {
// -90
this.$(".leftshuaxin").onclick = () => {
this.xuanzhuan(-90)
}
// +90
this.$(".rightshuaxin").onclick = () => {
this.xuanzhuan(90)
}
}
MouseEvent() {
// 鼠标滑动的时候放大缩小网页
document.onmousewheel = (e) => {
if (e.wheelDelta == 210) {
this.$(".fangda").onclick()
} else {
this.$(".suoxiao").onclick()
}
}
// document.addEventListener('mousewheel',(e) => {
// if (e.wheelDelta == 210) {
// this.$(".fangda").onclick()
// } else {
// this.$(".suoxiao").onclick()
// }
// },false)
// 鼠标在图片上按下的时候
this.$(".mainImg").onmousedown = (e) => {
e.preventDefault()
this.isBackMove = true
//获取鼠标按下的坐标
this.x1 = e.clientX;
this.y1 = e.clientY;
this.l = parseInt(this.$(".mainImg").style.marginLeft);
this.t = this.$(".mainImg").offsetTop;
this.ImgMove(".mainImg")
}
// 按住拖动，但鼠标从图片上离开的
// 给背景层绑定鼠标移动事件
this.$(".mainImg").onmouseleave = () => {
console.log("鼠标从图片上离开的，给背景层绑定鼠标移动事件");
if (this.isBackMove) {
this.ImgMove(".preview")
}
}
// 鼠标在背景层上松开
this.$(".preview").onmouseup = (ev) => {
console.log("鼠标在背景层上松开");
this.isBackMove = false
this.$(".mainImg").onmousemove = null;
this.$(".preview").onmousemove = null;
}
// 鼠标在图片上松开
this.$(".mainImg").onmouseup = (ev) => {
console.log("鼠标在图片上松开");
this.$(".mainImg").onmousemove = null;
this.$(".preview").onmousemove = null;
}
}
ImgMove(className) {
this.$(className).onmousemove = (ev) => {
var x2 = ev.clientX;
var y2 = ev.clientY;
//计算出鼠标的移动距离
var x = x2 - this.x1;
var y = y2 - this.y1;
//移动的数值与元素的left，top相加，得出元素的移动的距离
var lt = y + this.t;
var ls = x + this.l;
//更改元素的left，top值
this.$(".mainImg").style.marginLeft = ls + 'px';
this.$(".mainImg").style.marginTop = lt + 'px';
}
}
xuanzhuan(offset) {
this.$(".mainImg").style.transform = `scale(${this.Scale()}) rotate(${this.Rotate() + offset}deg)`
}
// 关闭按钮
BindClose() {
//1 var ddddc = this;
//2 es6 => 箭头函数
console.log("this1: ", this);
// this 指向
this.$(".closed").onclick = () => {
this.body.removeChild(this.$(".previewImage"))
}
}
// 上一页
BindPrevious() {
this.$(".left").onclick = () => {
this.option.showIndex -= 1;
if (this.option.showIndex < 0) {
this.option.showIndex = this.option.image.length - 1
}
this.$(".mainImg").src = this.option.image[this.option.showIndex]
}
}
// 下一页
BindNext() {
this.$(".right").onclick = () => {
this.option.showIndex += 1;
if (this.option.showIndex > this.option.image.length - 1) {
this.option.showIndex = 0
}
this.$(".mainImg").src = this.option.image[this.option.showIndex]
}
}
Scale() {
return Number(this.$(".mainImg").style.transform.match(/scale\(([\s\S]*?)\) /)[1])
}
Rotate() {
return Number(this.$(".mainImg").style.transform.match(/rotate\(([\s\S]*?)deg\)/)[1])
}
$(className) {
return document.querySelector(className)
}
}