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vue-picture-preview.vue
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<template>
<transition name="fade">
<div class="lg-preview-wrapper" v-show="preview.show" @click="leave" @touchmove.prevent @touchstart = "starttouch" @touchend = "endtouch">
<div class="lg-preview-loading" v-show="preview.loading"><div></div></div>
<div class = "lg-preview-top-title" v-if="preview.isTopTitleShow" v-show="!preview.loading">
{{preview.current.topTitle}}
</div>
<img
class="lg-preview-img"
v-if="preview.current.src"
:src="preview.current.src"
:alt="preview.current.title"
v-show="!preview.loading"
>
<!--
- 增加一个字段isCurrentAndAllTitle 用于改变标题的类型
- 字段默认为true 为true时候可以 判断使得该标题改为当前页/总页数
-->
<div class="lg-preview-bottom-title" v-if="preview.isCurrentAndAllTitle" v-show="!preview.loading">
{{preview.current.index}}/{{preview.list.length}}
</div>
<div class="lg-preview-bottom-title" v-if="!preview.isCurrentAndAllTitle && preview.isTitleEnable" v-show="!preview.loading">
{{preview.current.bottomTitle}}
</div>
<div class="lg-preview-nav-left" v-if="preview.isHorizontalNavEnable" v-show="!preview.loading">
<span class="lg-preview-nav-arrow" @click="preAction" ></span>
</div>
<div class="lg-preview-nav-right" v-if="preview.isHorizontalNavEnable" v-show="!preview.loading">
<span class="lg-preview-nav-arrow" @click="nextAction"></span>
</div>
<div class = "tipStyle" v-show = "tipShow && !preview.loading">
{{tipText}}
</div>
</div>
</transition>
</template>
<script>
export default {
name: 'Preview',
data(){
return {
startX :"",
endX :"",
tipShow:false,
tipText:"",
}
},
computed: {
preview () {
return window.LOGIC_EVENT_BUS.LOGIC_PREVIEW
}
},
methods: {
leave (e) {
if ((this.preview.show)&&(e.target.className.indexOf('lg-preview-nav-arrow') != 0)){
this.close()
}
},
close () {
this.preview.show = false
},
preAction () {
this.preview.loading = true
var index = this.preview.list.indexOf(this.preview.current)
if (index === 0) {
this.tipShow = true;
this.tipText = "前面没有更多了";
setTimeout(()=>{
this.tipShow = false;
},1500)
this.preview.loading = false
return
}
index--
this.preview.current = this.preview.list[index]
const img = new window.Image()
img.src = this.preview.current.src
img.onload = function () {
setTimeout(function () {
LOGIC_EVENT_BUS.LOGIC_PREVIEW.loading = false
},500)
}
},
nextAction () {
this.preview.loading = true
var index = this.preview.list.indexOf(this.preview.current)
if (index === this.preview.list.length - 1) {
this.tipText = "后面没有更多了";
this.tipShow = true;
setTimeout(()=>{
this.tipShow = false;
},1500)
this.preview.loading = false
return
}
index++
this.preview.current = this.preview.list[index]
const img = new window.Image()
img.src = this.preview.current.src
img.onload = function () {
setTimeout(function () {
LOGIC_EVENT_BUS.LOGIC_PREVIEW.loading = false
},500)
}
},
/**
* @desc 此处只取一根手指 防止有人喜欢两根手指滑动，暂时不处理缩放
*/
starttouch(event){
this.startX = event.changedTouches[0].clientX
},
endtouch(event){
this.endX = event.changedTouches[0].clientX
if(this.endX > this.startX){
this.preAction();
}
if(this.endX < this.startX){
this.nextAction();
}
},
}
}
</script>
<style scoped>
.fade-enter-active, .fade-leave-active {
transition: opacity .5s
}
.fade-enter, .fade-leave-active {
opacity: 0
}
.tipStyle{
font-size:12px;
text-align:center;
line-height:36px;
position:fixed;
top:50%;
left:50%;
margin-top:-12px;
margin-left:-15%;
width:30%;
border-radius:7px;
background:rgba(0,0,0,.8);
color:#fff;
z-index:3;
}
.lg-preview-wrapper {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
text-align: center;
box-sizing: border-box;
background: rgba(0, 0, 0, 0.9);
z-index: 10000;
}
.lg-preview-loading {
position: absolute;
width: 30px;
height: 35px;
top: 50%;
left: 50%;
margin-top: -17.5px;
margin-left: -15px;
}
.lg-preview-loading > div {
display: inline-block;
height: 25px;
width: 25px;
background: transparent;
border-radius: 100%;
border: 2px solid #fff;
border-bottom-color: transparent;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
-webkit-animation: rotate 0.75s 0s linear infinite;
animation: rotate 0.75s 0s linear infinite;
}
@keyframes rotate {
0% {
-webkit-transform: rotate(0deg) scale(1);
transform: rotate(0deg) scale(1);
}
50% {
-webkit-transform: rotate(180deg) scale(0.6);
transform: rotate(180deg) scale(0.6);
}
100% {
-webkit-transform: rotate(360deg) scale(1);
transform: rotate(360deg) scale(1);
}
}
.lg-preview-img {
max-width: 100%;
max-height: 100%;
display: block;
position: absolute;
left: 0;
top: 0;
bottom: 0;
right: 0;
margin: auto;
}
.lg-preview-nav-arrow {
position: absolute;
top: 50%;
margin-top: -15px;
background: rgba(0, 0, 0, 0);
line-height: 40px;
width: 20px;
height: 20px;
border-top: 2px solid #fff;
border-left: 2px solid #fff;
}
.lg-preview-nav-left,
.lg-preview-nav-right {
position: absolute;
height: 100%;
margin: 0 5px;
width: 200px;
top: 0;
color: #fff;
transition: opacity .2s;
}
.lg-preview-nav-left {
left: 0;
}
.lg-preview-nav-left .lg-preview-nav-arrow {
left: 0;
margin-left: 40px;
transform: rotate(-45deg);
}
.lg-preview-nav-right {
right: 0;
}
.lg-preview-nav-right .lg-preview-nav-arrow {
right: 0;
margin-right: 40px;
transform: rotate(135deg);
}
.lg-preview-bottom-title {
position: absolute;
left: 0;
bottom: 0;
text-align: center;
width: 100%;
color: #fff;
background: rgba(0, 0, 0, .5);
box-sizing: border-box;
font-size: 16px;
height: 40px;
line-height: 40px;
z-index:1
}
.lg-preview-top-title {
position: fixed;
left: 0;
top: 0;
text-align: center;
width: 100%;
color: #fff;
background: rgba(0, 0, 0, .5);
box-sizing: border-box;
font-size: 16px;
height: 40px;
line-height: 40px;
z-index:1
}
@media all and (max-width: 768px) {
.lg-preview-nav-left,
.lg-preview-nav-right {
width: 100px;
}
.lg-preview-nav-left .lg-preview-nav-arrow {
margin-left: 20px;
}
.lg-preview-nav-right .lg-preview-nav-arrow {
margin-right: 20px;
}
}
</style>