vue-router 手势滑动触发返回功能
Posted aillabig
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vue-router的路由变换只存在“变换前”和“变换后”,不存在“切换中”的状态,所以做不到大多数app(微信那样的)在滑动过程中让界面跟随手指移动。但滑动事件还是可以监听的,我们可以在滑动之后再触发路由回退事件。
微博的滑动返回基本上就是这样的原理:先滑动、再触发返回事件,但用起来很是怪异,有严重的滞后感。夸克浏览器做的就比较好:一是滑动时界面虽然不动,但是界面上有小图标提示,能让用户接受到反馈;二是返回过程很快,没有多余的过渡动画。
app.vue文件如下:
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<template> <div id= "app" v-on:touchstart= "bodyTouchStart" v-on:touchmove= "bodyTouchMove" v-on:touchend= "bodyTouchEnd" > <transition :name= "direction" > <keep-alive include= "home" > <router-view class= "appView" ></router-view> </keep-alive> </transition> </div> </template> <script> var swidth = document.documentElement.clientWidth; export default { name: ‘app‘ , data: () => ({ // direction 页面切换的过渡动画,配合transition组件使用 direction: "slide-left" , // touchLeft 划动起点界限,起点在靠近屏幕左侧时才有效 touchLeft: swidth*2/5, // touchStartPoint 记录起始点X坐标 touchStartPoint: 0, // distance 记录划动的距离 distance: 0, // 回退按钮的dom,根据页面上是否存在此dom来判断该路由是否可回退 backBtn: null }), watch: { // 监听路有变化,决定页面过渡动画 $route(to, from) { if (from.name == "login" || from.path.indexOf( "home" ) > -1) { this .direction = "slide-left" ; } else if (to.path.indexOf( "home" ) > -1) { this .direction = "slide-right" ; } else { const toDepth = to.path.split( "/" ).length; const fromDepth = from.path.split( "/" ).length; this .direction = toDepth < fromDepth ? "slide-right" : "slide-left" ; } } }, methods: { bodyTouchStart: function (event) { this .backBtn = document.getElementById( "navback" ); if ( this .backBtn) { // 获得起点X坐标,初始化distance为0 this .touchStartPoint = event.targetTouches[0].pageX; this .distance = 0; } }, bodyTouchMove: function (event) { if ( this .backBtn && this .touchStartPoint < this .touchLeft) { // 只监听单指划动,多指划动不作响应 if (event.targetTouches.length > 1) { return ; } // 实时计算distance this .distance = event.targetTouches[0].pageX - this .touchStartPoint; // 根据distance在页面上做出反馈。这里演示通过返回按钮的背景变化作出反馈 if ( this .distance > 0 && this .distance < 100) { this .backBtn.style.backgroundPosition = (( this .distance - 100) / 100) * 50 + "px 0" ; } else if ( this .distance >= 100) { this .backBtn.style.backgroundPosition = "0 0" ; } else { this .backBtn.style.backgroundPosition = "-50px 0" ; } } }, bodyTouchEnd: function (event) { if ( this .backBtn && this .touchStartPoint < this .touchLeft) { // 划动结束,重置数据 this .touchStartPoint = 0; this .backBtn.style.backgroundPosition = "-50px 0" ; // 当划动距离超过100px时,触发返回事件 if ( this .distance > 100) { // 返回前修改样式,让过渡动画看起来更快 document.getElementById( "app" ).classList.add( "quickback" ); this .$router.back(); setTimeout( function (){ document.getElementById( "app" ).classList.remove( "quickback" ); },250) } } } } } </script> <style> #app { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; width: 100%; overflow-x: hidden; } .appView { position: absolute; width: 100%; background: #fff; min-height: 100vh; transition: transform 0.24s ease-out; } #app.quickback .appView{ transition-duration: 0.1s; } .slide-left-enter { transform: translate(100%, 0); } .slide-left-leave-active { transform: translate(-50%, 0); } .slide-right-enter { transform: translate(-50%, 0); } .slide-right-leave-active { transform: translate(100%, 0); } </style> |
下面看下vue图片左右滑动及手势缩放
引入vue-awesome-swiperimport ‘swiper/dist/css/swiper.css‘;
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import { swiper, swiperSlide } from ‘vue-awesome-swiper‘ ;components: { swiper, swiperSlide, },data() { return { swiperOption: { width: window.innerWidth, zoom : true , initialSlide: 0, }, }; },<swiper :options= "swiperOption" ref= "imgOverview" style= "height: 100%;" > <swiper-slide v- for = "(img, index) in previewImg" > <div class= "swiper-zoom-container" > <img :src= "img" alt= "" > </div> </swiper-slide> </swiper> |
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