====================================================================
image.vue
====================================================================
<template>
<transition name="viewer-fade">
<div ref="bigImg" class="bigImg" v-show="visible">
<div class="back_mask"></div>
<span class="bigImg_close" @click=‘closebigImg‘>
<Icon type="md-close-circle" class="bigImg_close_Icon"/>
</span>
<div class="bigImg_action" v-if="zoomFlag">
<span @click="handleActions(‘zoomOut‘)">缩小</span>
<span @click="handleActions(‘zoomIn‘)">放大</span>
<span @click="handleActions(‘anticlocelise‘)"><Icon type="ios-undo"/></span>
<span @click="handleActions(‘clocelise‘)"><Icon type="ios-redo"/></span>
</div>
<div class="bigImg_Box">
<img
:src="showUrl"
ref="img"
class="bigImg_image"
:style=‘imgStyle‘
@mousedown="handleMouseDown"
@load="handleImgLoad"
@error="handleImgError"
>
</div>
</div>
</transition>
</template>
<script>
export default {
name:‘ShowLargeImage‘,
props:{
imageList:{
type: Array,
default: () => []
},
initialIndex: {
type: Number,
default: 0
},
zoomFlag:{
type: Boolean,
default: false
}
},
data(){
return {
index: this.initialIndex,
visible: false,
isloading: false,
isGrab: false,
transform: {
scale: 1,
deg: 0,
offsetX: 0,
offsetY: 0,
enableTransition: false
}
}
},
mounted(){
this.bingWheelKeyBaordEvent()
},
methods:{
handleActions(action, options = {}) {
if (this.loading) return;
const { zoomRate, rotateDeg, enableTransition } = {
zoomRate: 0.2,
rotateDeg: 90,
enableTransition: true,
...options
};
const { transform } = this;
switch (action) {
case ‘zoomOut‘:
if (transform.scale > 0.2) {
transform.scale = parseFloat((transform.scale - zoomRate).toFixed(3));
}
break;
case ‘zoomIn‘:
transform.scale = parseFloat((transform.scale + zoomRate).toFixed(3));
break;
case ‘clocelise‘:
transform.deg += rotateDeg;
break;
case ‘anticlocelise‘:
transform.deg -= rotateDeg;
break;
}
transform.enableTransition = enableTransition;
},
bingWheelKeyBaordEvent(){
this._mouseWheelHandler = this.rafThrottle(e => {
const delta = e.wheelDelta ? e.wheelDelta : -e.detail;
if (delta > 0) {
this.handleActions(‘zoomIn‘, {
zoomRate: 0.03,
enableTransition: false
});
} else {
this.handleActions(‘zoomOut‘, {
zoomRate: 0.03,
enableTransition: false
});
}
});
document.addEventListener(‘mousewheel‘, this._mouseWheelHandler, false);
},
handleImgLoad(){
this.isloading = false
},
handleImgError(){
this.isloading = false;
console.log(‘图片加载出错‘);
},
rafThrottle(fn) {
let locked = false;
return function(...args) {
if (locked) return;
locked = true;
window.requestAnimationFrame(_ => {
fn.apply(this, args);
locked = false;
});
};
},
closebigImg(){
this.visible = false
this.$emit(‘close-bigImg‘);
},
handleMouseDown(e) {
if (this.loading || e.button !== 0) return;
const { offsetX, offsetY } = this.transform;
const startX = e.pageX;
const startY = e.pageY;
this._dragHandler = this.rafThrottle(ev => {
this.transform.offsetX = offsetX + ev.pageX - startX;
this.transform.offsetY = offsetY + ev.pageY - startY;
});
this.isGrab = true
document.addEventListener(‘mousemove‘, this._dragHandler, false);
document.addEventListener(‘mouseup‘, ev => {
this.isGrab = false
document.removeEventListener(‘mousemove‘, this._dragHandler, false);
}, false);
e.preventDefault();
},
},
computed: {
showUrl(){
return this.imageList[this.index];
},
isfirst(){
return this.index === 0;
},
isLast(){
return this.index === this.imageList.length - 1;
},
imgStyle(){
const { scale, deg, offsetX, offsetY, enableTransition } = this.transform;
const { isGrab } = this
const style = {
transform: `scale(${scale}) rotate(${deg}deg)`,
transition: enableTransition ? ‘transform .3s‘ : ‘‘,
‘margin-left‘: `${offsetX}px`,
‘margin-top‘: `${offsetY}px`,
cursor: isGrab ? ‘grabbing‘ : ‘grab‘
};
// if (this.mode === Mode.CONTAIN) {
// style.maxWidth = style.maxHeight = ‘100%‘;
// }
return style;
}
},
watch:{
showUrl(val){
this.$nextTick(() => {
if(!this.$refs[‘img‘].complete){
this.isloading = true
}
})
}
},
}
</script>
<style scoped>
.bigImg {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 20000;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none
}
.bigImg_Box{
position: absolute;
z-index: 230;
width: 100%;
height: 100%;
display: flex;
justify-content: center;
align-items: center;
}
.back_mask{
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
opacity: .5;
background: #000
}
.bigImg_image{
max-height: 95%;
max-width: 90%;
position: absolute;
cursor: grab;
}
.bigImg_close{
position: absolute;
top: 50px;
right: 100px;
height: 30px;
width: 30px;
z-index: 2222;
}
.bigImg_close_Icon{
font-size: 30px;
color: white;
}
.bigImg_action{
position: absolute;
bottom: 50px;
left: calc(50% - 100px);
width: 200px;
z-index: 250;
height: 36px;
display: flex;
justify-content: space-evenly;
align-items: center;
border-radius: 18px;
background: #eaeaea;
color: #333333;
}
.bigImg_action span{
width: 24%;
display: block;
height: 100%;
display: flex;
align-items: center;
justify-content: center;
}
</style>
================================================================
image.js //新建vue 将上面的子组件包裹起来 初始化的将父vue初始化 然后将子组件显示。 中心思想就是： 道生一，一生二，二生三，三生万物，
================================================================
import ShowLargeImage from ‘./image.vue‘
import Vue from ‘vue‘;
ShowLargeImage.initialization = (props) =>{
const _props = props || {};
const Initialization = new Vue({
data: Object.assign({}, _props, {
imageList: [],
initialIndex: 0,
zoomFlag: false,
}),
render(h){
return h(ShowLargeImage, {
props: Object.assign({}, _props, {
imageList: this.imageList,
initialIndex: this.initialIndex,
zoomFlag: this.zoomFlag,
}),
on:{
"close-bigImg": this.closeBigImg
}
})
},
methods:{
closeBigImg(){
this.$destroy();
document.body.removeChild(this.$el);
this.onRemove();
},
}
})
const component = Initialization.$mount();
document.body.appendChild(component.$el);
const showLargeImage = Initialization.$children[0];
return {
show(propsFun= {}){
if (‘imageList‘ in propsFun){
showLargeImage.$parent.imageList = propsFun.imageList
}
if (‘initialIndex‘ in propsFun) {
showLargeImage.$parent.initialIndex = propsFun.initialIndex;
}
if(‘zoomFlag‘ in propsFun){
showLargeImage.$parent.zoomFlag = propsFun.zoomFlag
}
showLargeImage.$parent.onRemove = propsFun.onRemove;
showLargeImage.visible = true;
},
remove(){
showLargeImage.visible = false;
},
component: showLargeImage
}
}
export default ShowLargeImage;
================================================================
index.js 将组件全局化
================================================================
import ShowLargeImage from ‘./image.js‘
let newShowLargeImage
ShowLargeImage.show = function(props= {}){
newShowLargeImage = newShowLargeImage || ShowLargeImage.initialization({props});
props.onRemove = function(){
newShowLargeImage = null;
}
newShowLargeImage.show(props);
}
ShowLargeImage.remove = function(){
if(!newShowLargeImage){
return
}
newShowLargeImage = null
}
const IShowLargeImage = {
install: function(Vue){
// Vue.component(‘IShowLargeImage‘, ShowLargeImage)
Vue.prototype.IShowLargeImage = ShowLargeImage
}
}
export default IShowLargeImage;