摘要：
StartTransX:0、transX:0，//元素样式偏移。CssX:0//css在动作中实际完成的偏移量。
<template>
<tab :options="tabOpt" :state.sync="stateIndex"></tab>
</template>
<script type="text/babel">
import tab from 'components/tab_touch';
export default {
data(){
tabOpt:undefined,
stateIndex:0
},
components:{
"tab":tab
},
ready(){
this.tabOpt={
count: 2.3,
pin:true,
htmls:[
"<span>白日登山</span>",
"<span>望烽火</span>",
"<span>黄昏饮马</span>",
"<span>傍交河</span>",
"<span>行人刁斗</span>",
"<span>风沙暗</span>",
"<span>公主琵琶</span>",
"<span>幽怨多</span>",
"<span>野营万里</span>",
"<span>无城郭</span>",
"<span>雨雪纷纷</span>",
"<span>连大漠</span>"
],
slideCallback:function (dex) {
console.log(dex);
},
tabClassName:"tab",
tabActiveClassName: "active"
}
}
}
</script>options参数释义
| 参数名 | 简称 | 是否必填 | 类型 | 含义 | 默认值 | 其它 |
|---|---|---|---|---|---|---|
| count | 展示tab数 | 必填项 | 数值｜一屏中露出tab的个数｜ 无 | |||
| pin | 是否固定到顶部 | 可选项 | 布尔 | 当垂直滚动时，该组件即将超出屏幕时是否固定到头部 | false | |
| htmls | tab内容 | 必填项 | 数组[字符串] | 在tab中显示的html | 无 | |
| tabClassName | tabClassName | 可选项 | 字符串 | 单个tab的class名 | 无 | 一般用于自定义样式 |
| tabActiveClassName | tabActiveClassName | 可选项 | 字符串 | 激活的tab的class名 |
<template>
<div class="fixWrap">
<div :id="tabsWrapID"
v-touch:pan="onPan">
<div :style="wrapStyle">
<div v-for="item in options.htmls" track-by="$index" :style="''+tWidth+'px'"
@click.stop="this.state=$index"
:class="[options.tabClassName,$index==state?options.tabActiveClassName:'']">
{{{item}}}
</div>
</div>
</div>
</div>
</template>
<style lang="sass" rel="stylesheet/sass">
@import "tab.sass"
</style>
<script lang="babel" type="text/babel">
var VueTouch = require ('vue-touch');
Vue.use (VueTouch);
import requestAnimFrame from "utils/requestAnimFrame"
const sign = (num)=> {
return num >= 0 ? 1 : -1
}
export default {
props: ["options", "state"],
data(){
return {
tabsWrapID: undefined,//外容器ID
wrapWidth: "", //外容器宽度
tWidth: 0, //每一个选项卡应该有多宽
0, //宽度。
startTransX: 0,
transX: 0, //元素样式偏移。
cssX: 0 //动作中css实际完成的偏移。
}
},
methods: {
init(){
this.wrapWidth = document.getElementById (this.tabsWrapID).offsetWidth;
this.tWidth = this.wrapWidth / this.options.count;
this.width = this.tWidth * this.options.htmls.length;
setTimeout(function(){
this.$el.style["height"]= this.$el.children[0].clientHeight+"px";
}.bind(this),0)
if (this.options.pin) {
var elemRect = this.$el.getBoundingClientRect ();
var windowOffset = this.getWindowOffset ();
var winOffsetY = windowOffset.offsetY;
this.elemOffsetY = elemRect.top + winOffsetY;
document.addEventListener ('scroll', this.isTop);
}
},
onPan(event){
if (this.options.disPan) return;
this.transX = event.deltaX + this.startTransX;
this.cssX = this.transX;
if (event.eventType == 4) {
this.transX = -Math.round (-this.transX / this.tWidth) * this.tWidth; //整格滑动
var start = null;
if (this.transX > 0) {
// 头部回弹
this.transX = 0;
var speed = 24;
requestAnimFrame (step.bind (this));
function step (timestamp) {
this.cssX -= speed;
if (this.cssX > this.transX) requestAnimFrame (step.bind (this));
else this.startTransX = this.cssX = this.transX;
};
}
else if (this.transX < this.wrapWidth - this.width) {
// 尾部回弹
this.transX = this.wrapWidth - this.width;
var speed = 24;
requestAnimFrame (step.bind (this));
function step (timestamp) {
this.cssX += speed;
if (this.cssX < this.transX) requestAnimFrame (step.bind (this));
else this.startTransX = this.cssX = this.transX;
};
}
else {
//整格落位
let speed = 6;
let _sign = sign (this.cssX - this.transX);
if (_sign * (this.cssX - this.transX) > 1) requestAnimFrame (step.bind (this));
else this.cssX = this.transX;
function step (timestamp) {
if (start === null) start = timestamp;
let progress = timestamp - start;
if (progress < 3000) speed *= 1 - progress / 3000;
this.cssX -= _sign * speed;
if (_sign * (this.cssX - this.transX) > 1) requestAnimFrame (step.bind (this));
else this.cssX = this.transX;
};
}
this.startTransX = this.transX; //滑动结束设置下次滑动起始值。
}
},
slideTo(dex){
this.state = dex;
let speed = 10;
// 开头几个
if (dex + 1 <= this.options.count) {
this.transX = 0; // 设置应到位置。
if (this.startTransX < this.transX) {
let _sign = sign (this.transX - this.startTransX);
this.cssX = this.transX - _sign * this.tWidth;
requestAnimFrame (step.bind (this));
function step () {
this.cssX += _sign * speed;
if (_sign * (this.cssX - this.transX) < 0) requestAnimFrame (step.bind (this));
else {
this.cssX = this.startTransX = this.transX;
if (this.options.slideCallback) this.options.slideCallback (dex);
}
;
};
}
//无需动画
else {
this.cssX = this.startTransX = this.transX;
if (this.options.slideCallback) this.options.slideCallback (dex);
}
}
// 结尾几个
else if (this.options.htmls.length - dex <= this.options.count) {
this.transX = this.wrapWidth - this.width;// 设置应到位置。
if (this.startTransX > this.transX) {
let _sign = sign (this.transX - this.startTransX);
this.cssX = this.transX - _sign * this.tWidth;
requestAnimFrame (step.bind (this));
function step () {
this.cssX += _sign * speed;
if (_sign * (this.cssX - this.transX) < 0) requestAnimFrame (step.bind (this));
else {
this.cssX = this.startTransX = this.transX;
if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
}
};
}
else {
this.cssX = this.startTransX = this.transX; //无需动画
if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
}
}
//中
else {
this.transX = -this.tWidth * dex;// 设置应到位置。
let _sign = sign (this.transX - this.startTransX);
if (this.tWidth * (dex + 0.5 * (1 - _sign)) + this.startTransX >= 0 && this.tWidth * (dex + 0.5 * (1 - _sign)) + this.startTransX <= this.wrapWidth) {
//无需动画
this.cssX = this.transX = this.startTransX;
if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
}
else {
//需要动画
this.cssX = this.transX - _sign * this.tWidth;
requestAnimFrame (step.bind (this));
function step () {
this.cssX += _sign * speed;
if (_sign * (this.cssX - this.transX) < 0) requestAnimFrame (step.bind (this));
else {
this.cssX = this.startTransX = this.transX;
if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
}
};
}
}
},
isTop(){
var windowOffset = this.getWindowOffset (),
winOffsetY = windowOffset.offsetY,
isTop;
isTop = this.elemOffsetY <= winOffsetY;
if (isTop) {
this.$el.children[0].style['position'] = 'fixed';
this.$el.children[0].style['top'] = '0';
this.$el.children[0].style['left'] = '0';
}
else {
this.$el.children[0].style['position']='relative';
}
return isTop;
},
getWindowOffset(){
var t;
var win = window;
var pageXOffset = (typeof win.pageXOffset == 'number') ? win.pageXOffset : (((t = doc.documentElement) || (t = body.parentNode)) && typeof t.ScrollLeft == 'number' ? t : body).ScrollLeft;
var pageYOffset = (typeof win.pageYOffset == 'number') ? win.pageYOffset : (((t = doc.documentElement) || (t = body.parentNode)) && typeof t.ScrollTop == 'number' ? t : body).ScrollTop;
return {
offsetX: pageXOffset,
offsetY: pageYOffset
};
},
},
watch: {
options(){
this.tabsWrapID = parseInt (Math.random () * 1e10);
setTimeout (this.init.bind (this), 10);
},
state(val){
this.slideTo(val)
}
},
computed: {
wrapStyle(){
var _str = "";
if (this.width) _str += `${this.width}px;`;//宽度
_str += `-webkit-transform:translateX(${this.cssX}px);` //位移。
_str += `transform:translateX(${this.cssX}px);` //位移。
return _str
}
}
}
</script>
<style lang="sass" rel="stylesheet/sass" type="sass">
.fixWrap
z-index: 999
position: relative
.component-tabsWrap
100%
overflow: hidden
min-height: .1rem
position: relative
background: #fff
.component-tabs
height: 100%
display: table
.component-tab
display: table-cell
box-sizing: border-box
text-align: center
vertical-align: middle
</style>来源：http://blog.csdn.net/keliyxyz/article/details/52208484