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Appearance

28. 过渡与动画 ​

Vue封装的过度与动画：在插入、更新或移除DOM元素时，在合适的时候给元素添加样式类名

img

  1. 准备好样式

    1. 元素进入的样式
      • v-enter 进入的起点
      • v-enter-active 进入的过程中
      • v-enter-to 进入的终点
    2. 元素离开的样式
      • v-leave 离开的起点
      • v-leave-active 离开过程中
      • v-leave-to 离开的终点

  2. 使用<transition>包裹要过度的元素，并配置name属性，此时需要将上面样式名的v换为 name．

  3. 要让页面一开始就显示动画，需要添加appear

vue
<template>
  <div>
    <button @click="isShow = !isShow">显示/隐藏</button>
    <transition appear name="hello">
      <h1 v-show="isShow">你好啊 ！</h1>
    </transition>
  </div>
</template>

<script>
export default {
  name: 'Test',

  data() {
    return {
      isShow: true
    }
  },

  mounted() {},

  methods: {}
}
</script>

<style lang="less" scoped>
h1 {
  background-color: orange;
}
.hello-enter-active {
  animation: show 1s;
}

.hello-leave-active {
  animation: show 1s reverse;
}

@keyframes show {
  from {
    transform: translateX(-100%);
  }

  to {
    transform: translateX(0px);
  }
}
</style>
  1. 备注：若有多个元素需要过度，则需要使用<transition-group>，每个元素都要指定key 值
html
<transition-group name="hello" appear>
  <h1 v-show="!isShow" key="1">你好啊！</h1>
  <h1 v-show="isShow" key="2">尚硅谷！</h1>
</transition-group>
  1. 引入第三方动画库 Animate.css （ 记得先 npm i Animate.css ）
html
<transition-group appear
          name="animate__animated animate__bounce"
          enter-active-class="animate__swing"
          leave-active-class="animate__backOutUp">
  <h1 v-show="!isShow" key="1">你好啊！</h1>
  <h1 v-show="isShow" key="2">尚硅谷！</h1>
</transition-group>

效果 ​

App.vue ​

vue
<template>
  <div>
    <Test></Test>
    <Test2></Test2>
    <Test3></Test3>
  </div>
</template>

<script>
import Test from './components/Test'
import Test2 from './components/Test2'
import Test3 from './components/Test3'
export default {
  name: 'App',

  data() {
    return {}
  },
  components: {
    Test,
    Test2,
    Test3,
  },
  mounted() {},

  methods: {}
}
</script>

<style lang="scss" scoped>
</style>

Test.vue (css 动画) ​

vue
<template>
  <div>
    <button @click="isShow = !isShow">显示/隐藏</button>
    <transition appear name="hello">
      <h1 v-show="isShow">你好啊 ！</h1>
    </transition>
  </div>
</template>

<script>
export default {
  name: 'Test',

  data() {
    return {
      isShow: true
    }
  },

  mounted() {},

  methods: {}
}
</script>

<style lang="less" scoped>
h1 {
  background-color: orange;
}
.hello-enter-active {
  animation: show 1s;
}

.hello-leave-active {
  animation: show 1s reverse;
}

@keyframes show {
  from {
    transform: translateX(-100%);
  }

  to {
    transform: translateX(0px);
  }
}
</style>

Test2.vue （group） ​

vue
<template>
  <div>
    <button @click="isShow = !isShow">显示/隐藏</button>
    <!-- <transition appear name="hello">
      <h1 v-show="isShow">你好啊 ！</h1>
    </transition> -->

    <transition-group appear name="hello">
      <h1 v-show="isShow" key="1">你好啊 ！</h1>
      <h1 v-show="!isShow" key="2">菠萝咕噜肉</h1>
    </transition-group>
  </div>
</template>

<script>
export default {
  name: 'Test',

  data() {
    return {
      isShow: true
    }
  },

  mounted() {},

  methods: {}
}
</script>

<style lang="less" scoped>
h1 {
  background-color: orange;
}

// 进入的起点   // 离开的终点
.hello-enter,
.hello-leave-to {
  transform: translateX(-100%);
}

// 进入的终点   .hello-leave
.hello-enter-to,
.hello-leave {
  transform: translateX(0);
}

.hello-enter-active,
.hello-leave-active {
  transition: 0.5s linear;
}
</style>

Test3.vue （过渡） ​

vue
<template>
  <div>
    <button @click="isShow = !isShow">显示/隐藏</button>
    <transition-group appear name="animate__animated animate__bounce" enter-active-class="animate__swing" leave-active-class="animate__backOutUp">
      <!-- <h1 v-show="!isShow" key="1">你好啊！</h1> -->
      <h1 v-show="isShow" key="2">菠萝咕噜肉</h1>
    </transition-group>
  </div>
</template>

<script>
import 'animate.css'
export default {
  name: 'Test',

  data() {
    return {
      isShow: true
    }
  },

  mounted() {},

  methods: {}
}
</script>

<style lang="less" scoped>
h1 {
  background-color: orange;
}

// 进入的起点   // 离开的终点
.hello-enter,
.hello-leave-to {
  transform: translateX(-100%);
}

// 进入的终点   .hello-leave
.hello-enter-to,
.hello-leave {
  transform: translateX(0);
}

.hello-enter-active,
.hello-leave-active {
  transition: 0.5s linear;
}
</style>

优化Todo-List ​

MyFooter.vue ​

vue
<template>
	<div class="todo-footer" v-show="total">
		<label>
			<!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
			<input type="checkbox" v-model="isAll"/>
		</label>
		<span>
			<span>已完成{{doneTotal}}</span> / 全部{{total}}
		</span>
		<button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
	</div>
</template>

<script>
	export default {
		name:'MyFooter',
		props:['todos'],
		computed: {
			//总数
			total(){
				return this.todos.length
			},
			//已完成数
			doneTotal(){
				//此处使用reduce方法做条件统计
				/* const x = this.todos.reduce((pre,current)=>{
					console.log('@',pre,current)
					return pre + (current.done ? 1 : 0)
				},0) */
				//简写
				return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0) ,0)
			},
			//控制全选框
			isAll:{
				//全选框是否勾选
				get(){
					return this.doneTotal === this.total && this.total > 0
				},
				//isAll被修改时set被调用
				set(value){
					// this.checkAllTodo(value)
					this.$emit('checkAllTodo',value)
				}
			}
		},
		methods: {
			/* checkAll(e){
				this.checkAllTodo(e.target.checked)
			} */
			//清空所有已完成
			clearAll(){
				// this.clearAllTodo()
				this.$emit('clearAllTodo')
			}
		},
	}
</script>

<style scoped>
	/*footer*/
	.todo-footer {
		height: 40px;
		line-height: 40px;
		padding-left: 6px;
		margin-top: 5px;
	}

	.todo-footer label {
		display: inline-block;
		margin-right: 20px;
		cursor: pointer;
	}

	.todo-footer label input {
		position: relative;
		top: -1px;
		vertical-align: middle;
		margin-right: 5px;
	}

	.todo-footer button {
		float: right;
		margin-top: 5px;
	}
</style>

MyHeader.vue ​

vue
<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
  </div>
</template>

<script>
import {nanoid} from 'nanoid'
export default {
  name:'MyHeader',
  data() {
    return {
      //收集用户输入的title
      title:''
    }
  },
  methods: {
    add(){
      //校验数据
      if(!this.title.trim()) return alert('输入不能为空')
      //将用户的输入包装成一个todo对象
      const todoObj = {id:nanoid(),title:this.title,done:false}
      //通知App组件去添加一个todo对象
      this.$emit('addTodo',todoObj,1,2,3)
      //清空输入
      this.title = ''
    }
  },
}
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>

MyItem.vue ​

vue
<template>
	<li>
		<label>
			<input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)"/>
			<!-- 如下代码也能实现功能，但是不太推荐，因为有点违反原则，因为修改了props -->
			<!-- <input type="checkbox" v-model="todo.done"/> -->
			<span v-show="!todo.isEdit">{{todo.title}}</span>
			<input 
				type="text" 
				v-show="todo.isEdit" 
				:value="todo.title" 
				@blur="handleBlur(todo,$event)"
				ref="inputTitle"
			>
		</label>
		<button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
		<button v-show="!todo.isEdit" class="btn btn-edit" @click="handleEdit(todo)">编辑</button>
	</li>
</template>

<script>
	import pubsub from 'pubsub-js'
	export default {
		name:'MyItem',
		//声明接收todo
		props:['todo'],
		methods: {
			//勾选or取消勾选
			handleCheck(id){
				//通知App组件将对应的todo对象的done值取反
				// this.checkTodo(id)
				this.$bus.$emit('checkTodo',id)
			},
			//删除
			handleDelete(id){
				if(confirm('确定删除吗？')){
					//通知App组件将对应的todo对象删除
					// this.deleteTodo(id)
					// this.$bus.$emit('deleteTodo',id)
					pubsub.publish('deleteTodo',id)
				}
			},
			//编辑
			handleEdit(todo){
				if(todo.hasOwnProperty('isEdit')){
					todo.isEdit = true
				}else{
					// console.log('@')
					this.$set(todo,'isEdit',true)
				}
				this.$nextTick(function(){
					this.$refs.inputTitle.focus()
				})
			},
			//失去焦点回调（真正执行修改逻辑）
			handleBlur(todo,e){
				todo.isEdit = false
				if(!e.target.value.trim()) return alert('输入不能为空！')
				this.$bus.$emit('updateTodo',todo.id,e.target.value)
			}
		},
	}
</script>

<style scoped>
	/*item*/
	li {
		list-style: none;
		height: 36px;
		line-height: 36px;
		padding: 0 5px;
		border-bottom: 1px solid #ddd;
	}

	li label {
		float: left;
		cursor: pointer;
	}

	li label li input {
		vertical-align: middle;
		margin-right: 6px;
		position: relative;
		top: -1px;
	}

	li button {
		float: right;
		display: none;
		margin-top: 3px;
	}

	li:before {
		content: initial;
	}

	li:last-child {
		border-bottom: none;
	}

	li:hover{
		background-color: #ddd;
	}
	
	li:hover button{
		display: block;
	}
</style>

MyList.vue ​

vue
<template>
	<ul class="todo-main">
		<transition-group name="todo" appear>
			<MyItem 
				v-for="todoObj in todos"
				:key="todoObj.id" 
				:todo="todoObj" 
			/>
		</transition-group>
	</ul>
</template>

<script>
	import MyItem from './MyItem'

	export default {
		name:'MyList',
		components:{MyItem},
		//声明接收App传递过来的数据
		props:['todos']
	}
</script>

<style scoped>
	/*main*/
	.todo-main {
		margin-left: 0px;
		border: 1px solid #ddd;
		border-radius: 2px;
		padding: 0px;
	}

	.todo-empty {
		height: 40px;
		line-height: 40px;
		border: 1px solid #ddd;
		border-radius: 2px;
		padding-left: 5px;
		margin-top: 10px;
	}

	.todo-enter-active{
		animation: atguigu 0.5s linear;
	}

	.todo-leave-active{
		animation: atguigu 0.5s linear reverse;
	}

	@keyframes atguigu {
		from{
			transform: translateX(100%);
		}
		to{
			transform: translateX(0px);
		}
	}
</style>

App.vue ​

vue
<template>
	<div id="root">
		<div class="todo-container">
			<div class="todo-wrap">
				<MyHeader @addTodo="addTodo"/>
				<MyList :todos="todos"/>
				<MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
			</div>
		</div>
	</div>
</template>

<script>
	import pubsub from 'pubsub-js'
	import MyHeader from './components/MyHeader'
	import MyList from './components/MyList'
	import MyFooter from './components/MyFooter'

	export default {
		name:'App',
		components:{MyHeader,MyList,MyFooter},
		data() {
			return {
				//由于todos是MyHeader组件和MyFooter组件都在使用，所以放在App中（状态提升）
				todos:JSON.parse(localStorage.getItem('todos')) || []
			}
		},
		methods: {
			//添加一个todo
			addTodo(todoObj){
				this.todos.unshift(todoObj)
			},
			//勾选or取消勾选一个todo
			checkTodo(id){
				this.todos.forEach((todo)=>{
					if(todo.id === id) todo.done = !todo.done
				})
			},
			//更新一个todo
			updateTodo(id,title){
				this.todos.forEach((todo)=>{
					if(todo.id === id) todo.title = title
				})
			},
			//删除一个todo
			deleteTodo(_,id){
				this.todos = this.todos.filter( todo => todo.id !== id )
			},
			//全选or取消全选
			checkAllTodo(done){
				this.todos.forEach((todo)=>{
					todo.done = done
				})
			},
			//清除所有已经完成的todo
			clearAllTodo(){
				this.todos = this.todos.filter((todo)=>{
					return !todo.done
				})
			}
		},
		watch: {
			todos:{
				deep:true,
				handler(value){
					localStorage.setItem('todos',JSON.stringify(value))
				}
			}
		},
		mounted() {
			this.$bus.$on('checkTodo',this.checkTodo)
			this.$bus.$on('updateTodo',this.updateTodo)
			this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
		},
		beforeDestroy() {
			this.$bus.$off('checkTodo')
			this.$bus.$off('updateTodo')
			pubsub.unsubscribe(this.pubId)
		},
	}
</script>

<style>
	/*base*/
	body {
		background: #fff;
	}
	.btn {
		display: inline-block;
		padding: 4px 12px;
		margin-bottom: 0;
		font-size: 14px;
		line-height: 20px;
		text-align: center;
		vertical-align: middle;
		cursor: pointer;
		box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
		border-radius: 4px;
	}
	.btn-danger {
		color: #fff;
		background-color: #da4f49;
		border: 1px solid #bd362f;
	}
	.btn-edit {
		color: #fff;
		background-color: skyblue;
		border: 1px solid rgb(103, 159, 180);
		margin-right: 5px;
	}
	.btn-danger:hover {
		color: #fff;
		background-color: #bd362f;
	}
	.btn:focus {
		outline: none;
	}
	.todo-container {
		width: 600px;
		margin: 0 auto;
	}
	.todo-container .todo-wrap {
		padding: 10px;
		border: 1px solid #ddd;
		border-radius: 5px;
	}
</style>

main.js ​

js
//引入Vue
import Vue from 'vue'
//引入App
import App from './App.vue'
//关闭Vue的生产提示
Vue.config.productionTip = false

//创建vm
new Vue({
	el:'#app',
	render: h => h(App),
	beforeCreate() {
		Vue.prototype.$bus = this
	},
})

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