键盘事件与KeyBoardWrapper交互
场景
用遥控器控制网页浏览
原理
实现一个
KeyBoard.js类库创造一个
KeyBoardWrapper组件,每个组件生成对应的坐标信息和唯一idKeyBoardWrapper组件生成的实例交由KeyBoard维护执行
keyup事件分发,结合四条边坐标算出最近的实例操作该实例上的方法
KeyBoard.js
const KeyBoard = {
allNode: [], // 页面所有keyBoardWrapper节点
allNodePos: [], // 所有实例的中心坐标信息
isInDialog: false, // 当前focus是否处在dialog状态
addDialogNodePos: [], // 处于dialog状态所有实例的中心坐标信息
fitDirectionNodePos: [], // 符合当前操作方向的中心坐标信息
perfectNodeInfo: {}, // 方向操作后最佳的节点信息
currentOperateNodeInfo: {}, // 当前正在操作的节点信息
currentOperateVNode: {}, // 当前正在操作的vNode
scaleLen: 10, // 这里要加入模糊距离,暂定10px，因为在选中状态，scale大于1，当前块的左侧可能比符合匹配的块右侧更小
// 解键盘的key值
keyup (e) {
let obj = e.srcElement.dataset
this.main(e.keyCode, obj)
},
// click进入,找到最近满足的节点
click (e) {
// 对path冒泡
let obj = {}
for (let i = 0; i < e.path.length; i++) {
if (e.path[i].dataset && e.path[i].dataset.kbwid) {
obj = e.path[i].dataset
break
}
}
if (obj.kbwid) {
this.excute(obj.kbwid)
} else {
console.log('未找到节点')
}
},
// 主方法: 传递节点，发射事件
main (keyCode, obj) {
switch (keyCode) {
// 上
case 38:
// 下
case 40:
// 左
case 37:
// 右
case 39:
this.commonFn(keyCode, obj)
break
// 返回
case 8:
this.clickBackAndEnter(obj)
this.currentOperateVNode.back()
break
// enter
case 13:
this.clickBackAndEnter(obj)
this.currentOperateVNode.enter()
break
default:
break
}
},
// 统一方法: 上下左右
commonFn (keyCode, obj) {
// 找出当前正在操作的节点信息
this.currentOperateNodeInfo = this.findCurrentOperateNodeInfo(obj.kbwid)
// 找出当前正在操作的vNode
this.currentOperateVNode = this.findCurrentOperateVNode(obj.kbwid)
// 找出符合当前操作方向的所有节点
if (this.isInDialog) {
this.fitDirectionNodePos = this.findFixDirectionNodePos(keyCode, this.addDialogNodePos, this.currentOperateNodeInfo)
} else {
this.fitDirectionNodePos = this.findFixDirectionNodePos(keyCode, this.allNodePos, this.currentOperateNodeInfo)
}
// 计算并更新符合方向所有节点与当前节点位置关系
this.fitDirectionNodePos = this.calAllNodeDistance(keyCode, this.fitDirectionNodePos, this.currentOperateNodeInfo)
// 找出符合当前操作方向最优节点的kbwid
let perfectId = ''
if (this.fitDirectionNodePos.length > 0) {
perfectId = this.findPerfectVnodeId(this.fitDirectionNodePos)
} else {
perfectId = this.currentOperateNodeInfo.kbwid
}
console.log(perfectId)
console.log(this.allNode)
console.log(this.allNodePos)
console.log(this.fitDirectionNodePos)
// 操作最优节点执行动作
this.excute(perfectId)
},
// back和enter点击事件
clickBackAndEnter (obj) {
// 找出当前正在操作的节点信息
this.currentOperateNodeInfo = this.findCurrentOperateNodeInfo(obj.kbwid)
// 找出当前正在操作的vNode
this.currentOperateVNode = this.findCurrentOperateVNode(obj.kbwid)
this.currentOperateVNode.isActive = true
this.currentOperateVNode.$el.focus()
},
// 找到对应的实例执行方法
excute (perfectId) {
let vNode = {}
for (let i = 0; i < this.allNode.length; i++) {
if (this.allNode[i].kbwid === perfectId) {
vNode = this.allNode[i]
vNode.isActive = true
vNode.$el.focus()
} else {
vNode = this.allNode[i]
vNode.isActive = false
}
}
},
// 每次keyBoardWrapper创建时传入自身实例
create (e) {
this.allNode.push(e)
const pos = this.storePos(e)
this.allNodePos.push(pos)
if (e.isInDialog) {
this.addDialogNodePos.push(pos)
}
},
// 每次keyBoardWrapper销毁时
destroy (e) {
// 从数组中删除自身实例
for (let i = 0; i < this.allNode.length; i++) {
if (this.allNode[i].kbwid === e.kbwid) {
this.allNode.splice(i, 1)
break
}
}
// 删除自身坐标
for (let j = 0; j < this.allNodePos.length; j++) {
if (this.allNodePos[j].kbwid === e.kbwid) {
this.allNodePos.splice(j, 1)
break
}
}
// 删除带isInDialog标记坐标
if (e.isInDialog) {
for (let j = 0; j < this.addDialogNodePos.length; j++) {
if (this.addDialogNodePos[j].kbwid === e.kbwid) {
this.addDialogNodePos.splice(j, 1)
break
}
}
}
},
// 所有页面默认第一个实例设置为active
firstSetActive () {
if (this.allNode.length > 0) {
this.allNode[0].isActive = true
this.allNode[0].$el.focus()
}
},
// 存储所有实例坐标信息
// 新方式使用4条边的中点坐标
storePos (e) {
const el = e.$el
const offsetWidth = el.offsetWidth
const offsetHeight = el.offsetHeight
const offsetTop = el.offsetTop
const offsetLeft = el.offsetLeft
const kbwid = e.kbwid
// 上边中点
const upCenter = { x: offsetLeft + offsetWidth / 2, y: offsetTop }
// 下边中点
const downCenter = { x: offsetLeft + offsetWidth / 2, y: offsetTop + offsetHeight }
// 左边中点
const leftCenter = { x: offsetLeft, y: offsetTop + offsetHeight / 2 }
// 右边中点
const rightCenter = { x: offsetLeft + offsetWidth, y: offsetTop + offsetHeight / 2 }
const pos = { upCenter, downCenter, leftCenter, rightCenter, kbwid }
return pos
},
// 计算俩点间距离(勾股定理)
calTwoPointDistance (a, b) {
const straightLen_1 = Math.abs(a.x - b.x)
const straightLen_2 = Math.abs(a.y - b.y)
const slashLen = Math.sqrt(Math.pow(straightLen_1, 2) + Math.pow(straightLen_2, 2))
return slashLen
},
// 找出当前正在操作的节点
findCurrentOperateNodeInfo (kbwid) {
let currentOperateNodeInfo = {}
for (let i = 0; i < this.allNodePos.length; i++) {
if (this.allNodePos[i].kbwid === kbwid) {
currentOperateNodeInfo = this.allNodePos[i]
break
}
}
return currentOperateNodeInfo
},
// 找出当前正早操作的vNode
findCurrentOperateVNode (kbwid) {
let currentOperateVNode = {}
for (let i = 0; i < this.allNode.length; i++) {
if (this.allNode[i].kbwid === kbwid) {
currentOperateVNode = this.allNode[i]
break
}
}
return currentOperateVNode
},
// 计算所有节点与当前节点的位置关系
calAllNodeDistance (keyCode, arr, currentOperateNodeInfo) {
console.log(arr)
console.log(currentOperateNodeInfo)
switch (keyCode) {
// 上
case 38:
return arr.map((e) => {
e.distance = this.calTwoPointDistance(e.downCenter, currentOperateNodeInfo.upCenter)
return e
})
break
// 下
case 40:
return arr.map((e) => {
e.distance = this.calTwoPointDistance(e.upCenter, currentOperateNodeInfo.downCenter)
return e
})
break
// 左
case 37:
return arr.map((e) => {
e.distance = this.calTwoPointDistance(e.rightCenter, currentOperateNodeInfo.leftCenter)
return e
})
break
// 右
case 39:
return arr.map((e) => {
e.distance = this.calTwoPointDistance(e.leftCenter, currentOperateNodeInfo.rightCenter)
return e
})
break
default:
break
}
},
// 找出距离最优的实例id
findPerfectVnodeId (arr) {
let smDis = arr[0].distance
let smId = arr[0].kbwid
for (let i = 0; i < arr.length; i++) {
if (arr[i].distance < smDis) {
smDis = arr[i].distance
smId = arr[i].kbwid
}
}
return smId
},
// 找出符合当前操作方向的所有中心坐标
// 注意:这里要加入模糊距离,暂定20px，因为在选中状态，当前块的左侧可能比符合匹配的块右侧更小
findFixDirectionNodePos (keyCode, allNodePos, currentOperateNodeInfo) {
let fitDirectionNodePos = []
switch (keyCode) {
// 上
case 38:
for (let i = 0; i < allNodePos.length; i++) {
if (allNodePos[i].downCenter.y < currentOperateNodeInfo.upCenter.y + this.scaleLen) {
fitDirectionNodePos.push(allNodePos[i])
}
}
break
// 下
case 40:
for (let i = 0; i < allNodePos.length; i++) {
if (allNodePos[i].upCenter.y > currentOperateNodeInfo.downCenter.y - this.scaleLen) {
fitDirectionNodePos.push(allNodePos[i])
}
}
break
// 左
case 37:
for (let i = 0; i < allNodePos.length; i++) {
if (allNodePos[i].rightCenter.x < currentOperateNodeInfo.leftCenter.x + this.scaleLen) {
fitDirectionNodePos.push(allNodePos[i])
}
}
break
// 右
case 39:
for (let i = 0; i < allNodePos.length; i++) {
if (allNodePos[i].leftCenter.x > currentOperateNodeInfo.rightCenter.x - this.scaleLen ) {
fitDirectionNodePos.push(allNodePos[i])
}
}
break
default:
break
}
return fitDirectionNodePos
},
// 标记是否处在dialog状态: 用于控制此时上下左右的区域限制
changeDialogStatus (e) {
this.isInDialog = e
}
}
export { KeyBoard }KeyBoardWrapper.vue
<template>
<div
:class="isActive ? 'active component keyBoardWrapper' : 'component keyBoardWrapper'"
:style="myStyle"
:tabindex="keyIdx"
:data-kbwid="kbwid">
<!-- 插槽：显示自定义内容 -->
<slot></slot>
</div>
</template>
<script>
import { config, utilFn, KeyBoard } from '../../untils/index'
export default {
props: {
item: {
type: Object,
default: {}
},
keyIdx: {
type: Number,
default: 0
},
// postcss不支持行内样式
myStyle: {
type: String,
default: ''
},
isInDialog: {
type: Boolean,
default: false
}
},
components: {},
computed: {},
watch: {
'isActive': function (newObj) {
this.vNodeFocus(newObj)
}
},
data () {
return {
staticHost: config.staticHost,
defaultImg: config.defaultImg,
assets: config.defaultImg.assets,
kbwid: '',
isActive: false
}
},
beforeCreate () {},
created () {},
beforeMount () {},
mounted () {
this.kbwid = utilFn.createKeyWrapperId()
// 将实例传入KeyBoard
KeyBoard.create(this)
// 通知keyBoard是否处在dialog
KeyBoard.changeDialogStatus(this.isInDialog)
},
beforeUpdate () {},
updated () {},
beforeDestroy () {},
destroyed () {
// 将KeyBoard对应实例销毁
KeyBoard.destroy(this)
},
methods: {
// 确认
enter (e) {
// 使用$parent传值
this.transToParent()
this.$emit('enter', null)
},
// 返回
back (e) {
this.$emit('back', e)
},
// 节点focus
vNodeFocus (e) {
// 这里只有当前节点和下一节点会触发watch isActive,
if (e) {
// 得焦
this.transToParent()
this.$emit('focus', { e, keyIdx: this.keyIdx })
} else {
// 失焦
this.$emit('blur', { e, keyIdx: this.keyIdx })
}
},
// 给父组件传值
transToParent () {
let currentOperateObj = {}
if (this.$parent.hasOwnProperty('currentOperateObj')) {
currentOperateObj = {...this.item, kbwid: this.kbwid }
}
this.$parent.currentOperateObj = currentOperateObj
}
}
}
</script>
<style lang='scss' scoped>
</style>使用
<KeyBoardWrapper
v-for="(item, index) in beaforeOptions"
:item="item"
:key="index"
:keyIdx="index"
:myStyle="beaforeStyle"
@enter="beaforeEnter"
@back="beaforeBack">
<div class="group">
<span :class="'iconfont ' + item.icon "></span>
<span class="tips">{{item.label}}</span>
</div>
</KeyBoardWrapper>Last updated
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