vue 外掛tab選項卡
阿新 • • 發佈:2019-01-22
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: "", //外容器寬度
tWidth: 0, //每一個選項卡應該有多寬
width: 0, //寬度。
startTransX: 0,
transX: 0, //元素樣式偏移。
cssX: 0 //動作中css實際完成的偏移。
}
},
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; //整格滑動
var start = null;
if (this.transX > 0) {
// 頭部回彈
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) {
// 尾部回彈
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; //滑動結束設定下次滑動起始值。
}
},
slideTo(dex){
this.state = dex;
let speed = 10;
// 開頭幾個
if (dex + 1 <= this.options.count) {
this.transX = 0; // 設定應到位置。
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);
}
;
};
}
//無需動畫
else {
this.cssX = this.startTransX = this.transX;
if (this.options.slideCallback) this.options.slideCallback (dex);
}
}
// 結尾幾個
else if (this.options.htmls.length - dex <= this.options.count) {
this.transX = this.wrapWidth - this.width;// 設定應到位置。
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; //無需動畫
if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
}
}
//中
else {
this.transX = -this.tWidth * dex;// 設定應到位置。
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) {
//無需動畫
this.cssX = this.transX = this.startTransX;
if (typeof this.options.slideCallback == "function") this.options.slideCallback (dex);
}
else {
//需要動畫
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.$el.children[0].style['position']='relative';
}
return isTop;
},
getWindowOffset(){
var t;
var win = window;
var pageXOffset = (typeof win.pageXOffset == 'number') ? win.pageXOffset : (((t = doc.documentElement) || (t = body.parentNode)) && typeof t.ScrollLeft == 'number' ? t : body).ScrollLeft;
var pageYOffset = (typeof win.pageYOffset == 'number') ? win.pageYOffset : (((t = doc.documentElement) || (t = body.parentNode)) && typeof t.ScrollTop == 'number' ? t : body).ScrollTop;
return {
offsetX: pageXOffset,
offsetY: pageYOffset
};
},
},
watch: {
options(){
this.tabsWrapID = parseInt (Math.random () * 1e10);
setTimeout (this.init.bind (this), 10);
},
state(val){
this.slideTo(val)
}
},
computed: {
wrapStyle(){
var _str = "";
if (this.width) _str += `width:${this.width}px;`;//寬度
_str += `-webkit-transform:translateX(${this.cssX}px);` //位移。
_str += `transform:translateX(${this.cssX}px);` //位移。
return _str
}
}
}