snap.js
3.91 KB
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import BScroll from 'scroll/index'
// import { dispatchTouchStart, dispatchTouchMove, dispatchSwipe } from '../../utils/event'
describe('BScroll - snap', () => {
let scroll
let slideWrapper
beforeEach(() => {
let style = document.createElement('style')
style.type = 'text/css'
const styleSheet = `
.full-page-slide-wrapper {
position: fixed;
z-index: 20;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgb(239, 239, 244);
overflow: hidden;
}
.slide {
height: 100%;
}
.slide-group {
height: 100%;
position: relative;
overflow: hidden;
white-space: nowrap;
}
.slide-item {
height: 100%;
box-sizing: border-box;
overflow: hidden;
text-align: center;
float: left;
}
.slide-item:first-child {
background: #fc9153;
}
.slide-item:nth-child(2) {
background: yellowgreen;
}
.slide-item:nth-child(3) {
background: #333;
}
`
style.appendChild(document.createTextNode(styleSheet))
document.head.appendChild(style)
slideWrapper = document.createElement('div')
slideWrapper.className = 'full-page-slide-wrapper'
slideWrapper.innerHTML = `
<div class="slide">
<div class="slide-group">
<div></div>
<div></div>
<div></div>
</div>
</div>
`
document.body.appendChild(slideWrapper)
const slideEle = document.querySelector('.slide')
const slideGroup = document.querySelector('.slide-group')
let loop = false
function setSlideWidth(isResize) {
let children = slideGroup.children
let width = 0
let slideWidth = slideEle.clientWidth
for (let i = 0; i < children.length; i++) {
let child = children[i]
child.classList.add('slide-item')
child.style.width = slideWidth + 'px'
width += slideWidth
}
if (loop && !isResize) {
width += 2 * slideWidth
}
slideGroup.style.width = width + 'px'
}
setSlideWidth(false)
scroll = new BScroll(slideEle, {
scrollX: true,
momentum: false,
snap: {
loop: false,
threshold: 0.3,
speed: 400
},
startX: 0,
click: true
})
})
afterEach(() => {
if (slideWrapper) {
document.body.removeChild(slideWrapper)
scroll.destroy()
}
})
it('next', (done) => {
setTimeout(() => {
scroll.next()
expect(scroll.currentPage.pageX)
.to.equal(1)
scroll.next()
expect(scroll.currentPage.pageX)
.to.equal(2)
expect(scroll.currentPage.pageX)
.to.equal(2)
done()
}, 0)
})
it('prev', (done) => {
setTimeout(() => {
scroll.next()
expect(scroll.currentPage.pageX)
.to.equal(1)
scroll.next()
expect(scroll.currentPage.pageX)
.to.equal(2)
scroll.prev()
expect(scroll.currentPage.pageX)
.to.equal(1)
scroll.prev()
expect(scroll.currentPage.pageX)
.to.equal(0)
done()
}, 0)
})
it('goToPage', (done) => {
setTimeout(() => {
scroll.goToPage(1, 0)
expect(scroll.currentPage.pageX)
.to.equal(1)
scroll.prev()
scroll.goToPage(2, 0)
expect(scroll.currentPage.pageX)
.to.equal(2)
scroll.pages = undefined
scroll.goToPage(1, 0)
expect(scroll.currentPage.pageX)
.to.equal(2)
scroll.pages = []
scroll.goToPage(1, 0)
expect(scroll.currentPage.pageX)
.to.equal(2)
done()
}, 0)
})
it('getCurrentPage', (done) => {
setTimeout(() => {
let curPage = scroll.getCurrentPage()
expect(curPage.pageX)
.to.equal(0)
scroll.next()
curPage = scroll.getCurrentPage()
expect(curPage.pageX)
.to.equal(1)
done()
})
})
})