【Vue2.0学习】—Todolist案例（五十九）

<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
                <MyHeader :addtodo="addtodo" />
                <List :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo" />
                <MyFooter 
                :todos="todos"
                 :checkAllTodo="checkAllTodo" 
                 :clearAllTodo="clearAllTodo" />
            </div>
        </div>
    </div>
</template>
<script>
    import MyHeader from './components/MyHeader.vue'
    import List from './components/List.vue'
    import MyFooter from './components/MyFooter.vue'
    export default {
        name: 'App',
        components: {
            MyHeader,
            List,
            MyFooter
        },
        data() {
            return {
                todos: [{
                    id: '001',
                    title: '吃饭',
                    done: true
                }, {
                    id: '002',
                    title: '睡觉',
                    done: false
                }, {
                    id: '003',
                    title: '打豆豆',
                    done: true
                }]
            }
        },
        methods: {
            //添加 todo
            addtodo(todoObj) {
                this.todos.unshift(todoObj)
            },
            //勾选or取消勾选
            checkTodo(id) {
                this.todos.forEach((todo) => {
                    //函数体
                    if (todo.id === id) {
                        todo.done = !todo.done;
                    }
                })
            },
            //删除
            deleteTodo(id) {
                this.todos = this.todos.filter(todo => todo.id !== id)
            },
            //全选全不选
            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
                }) 
            }
        }
    }
</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-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>

<template>
    <li>
        <label>
            <input type="checkbox" 
            :checked="todo.done"
             @change="handleCheck(todo.id)" />
            <!-- <input type="checkbox" v-model="todo.done" /> -->
            <span>{{todo.title}}</span>
        </label>
        <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
    </li>
</template>
<script>
    export default { 
        name: 'Item',
        //声明接收to对象
        props: ['todo','checkTodo','deleteTodo'],
        methods: {
            //勾选
            handleCheck(id) {
                //通知APP组件将对应的组件
               this.checkTodo(id)
            },
            //删除
            handleDelete(id) {
                if (confirm('确定删除吗？')) {
               this.deleteTodo(id)
                }
            }
        }
    }
</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>

<template>
    <ul class="todo-main">
        <Item v-for="todoObj in todos" 
        :key="todoObj.id" 
        :todo="todoObj" 
        :checkTodo="checkTodo"
        :deleteTodo="deleteTodo" />
    </ul>
</template>
<script>
    import Item from './Item.vue'
    export default {
        name: 'List',
        props: ['todos', 'checkTodo', 'deleteTodo'],
        components: {
            Item
        },
    }
</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;
    }
</style>

<template>
    <div class="todo-footer" v-show="total">
        <label>
            <input type="checkbox" :checked="isAll" @change="checkAll">
        </label>
        <span>
            <span>{{doneTotal}}</span> / {{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', 'checkAllTodo','clearAllTodo'],
        computed: {
            total() {
                return this.todos.length
            },
            isAll() {
                return this.doneTotal === this.total && this.total > 0
            },
            doneTotal() {
                let i = 0
                this.todos.forEach((todo) => {
                    if (todo.done) i++
                })
                return i
                //    const x= this.todos.reduce(()=>{
                //     console('@',pre,current)
                //     return pre+(current.done ? 1:0)
                //     },0)
                //  return this.todos.reduce((pre,todo)=>pre+(todo.done?1:0),0)
            }
        },
        methods: {
            checkAll(e) {
                this.checkAllTodo(e.target.checked)
            },
            clearAll(){
                this.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>

<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="add" v-model="title"/>
    </div>
</template>
<script>
import {nanoid} from 'nanoid'
    export default {
        name: 'MyHeader',
        props:['addtodo'],
        data(){
            return{
                title:''
            }
        },
        methods: {
            add() {
                //将用户的输入包装成一个对象
                //校验数据
                if(!this.title.trim()) return alert('输入不能为空')
            //将用户包装成一个对象
                const todoObj={id:nanoid(),title:this.title,done:false}                                  
                     //通知APP组件去添加一个对象
                this.addtodo(todoObj);
                // 清空todo
                 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>