element-plus/packages/components/scrollbar/__tests__/scrollbar.spec.ts

import { nextTick } from 'vue'
import { mount } from '@vue/test-utils'
import { defineGetter, makeScroll } from '@element-plus/test-utils'
import Scrollbar from '../src/scrollbar.vue'

const _mount = (template: string) =>
  mount({
    components: {
      'el-scrollbar': Scrollbar,
    },
    template,
  })

describe('ScrollBar', () => {
  test('vertical', async () => {
    const outerHeight = 204
    const innerHeight = 500
    const wrapper = _mount(`
      <el-scrollbar style="height: ${outerHeight}px">
        <div style="height: ${innerHeight}px;"></div>
      </el-scrollbar>
    `)

    const scrollDom = wrapper.find('.el-scrollbar__wrap').element

    const offsetHeightRestore = defineGetter(
      scrollDom,
      'offsetHeight',
      outerHeight
    )
    const scrollHeightRestore = defineGetter(
      scrollDom,
      'scrollHeight',
      innerHeight
    )

    await makeScroll(scrollDom, 'scrollTop', 100)
    expect(wrapper.find('.is-vertical div').attributes('style')).toContain(
      'height: 80px; transform: translateY(50%);'
    )
    await makeScroll(scrollDom, 'scrollTop', 300)
    expect(wrapper.find('.is-vertical div').attributes('style')).toContain(
      'height: 80px; transform: translateY(150%);'
    )
    offsetHeightRestore()
    scrollHeightRestore()
  })

  test('horizontal', async () => {
    const outerWidth = 204
    const innerWidth = 500
    const wrapper = _mount(`
      <el-scrollbar style="height: 100px; width: ${outerWidth}px">
        <div style="height:100px; width: ${innerWidth}px;"></div>
      </el-scrollbar>
    `)

    const scrollDom = wrapper.find('.el-scrollbar__wrap').element

    const offsetWidthRestore = defineGetter(
      scrollDom,
      'offsetWidth',
      outerWidth
    )
    const scrollWidthRestore = defineGetter(
      scrollDom,
      'scrollWidth',
      innerWidth
    )

    await makeScroll(scrollDom, 'scrollLeft', 100)
    expect(wrapper.find('.is-horizontal div').attributes('style')).toContain(
      'width: 80px; transform: translateX(50%);'
    )
    await makeScroll(scrollDom, 'scrollLeft', 300)
    expect(wrapper.find('.is-horizontal div').attributes('style')).toContain(
      'width: 80px; transform: translateX(150%);'
    )
    offsetWidthRestore()
    scrollWidthRestore()
  })

  test('both vertical and horizontal', async () => {
    const outerHeight = 204
    const innerHeight = 500
    const outerWidth = 204
    const innerWidth = 500
    const wrapper = _mount(`
      <el-scrollbar style="height: ${outerHeight}px; width: ${outerWidth}px;">
        <div style="height: ${innerHeight}px; width: ${innerWidth}px;"></div>
      </el-scrollbar>
    `)

    const scrollDom = wrapper.find('.el-scrollbar__wrap').element

    const offsetHeightRestore = defineGetter(
      scrollDom,
      'offsetHeight',
      outerHeight
    )
    const scrollHeightRestore = defineGetter(
      scrollDom,
      'scrollHeight',
      innerHeight
    )
    const offsetWidthRestore = defineGetter(
      scrollDom,
      'offsetWidth',
      outerWidth
    )
    const scrollWidthRestore = defineGetter(
      scrollDom,
      'scrollWidth',
      innerWidth
    )

    await makeScroll(scrollDom, 'scrollTop', 100)
    await makeScroll(scrollDom, 'scrollLeft', 100)
    expect(wrapper.find('.is-vertical div').attributes('style')).toContain(
      'height: 80px; transform: translateY(50%);'
    )
    expect(wrapper.find('.is-horizontal div').attributes('style')).toContain(
      'width: 80px; transform: translateX(50%);'
    )
    await makeScroll(scrollDom, 'scrollTop', 300)
    await makeScroll(scrollDom, 'scrollLeft', 300)
    expect(wrapper.find('.is-vertical div').attributes('style')).toContain(
      'height: 80px; transform: translateY(150%);'
    )
    expect(wrapper.find('.is-horizontal div').attributes('style')).toContain(
      'width: 80px; transform: translateX(150%);'
    )

    offsetHeightRestore()
    scrollHeightRestore()
    offsetWidthRestore()
    scrollWidthRestore()
  })

  test('should render height props', async () => {
    const outerHeight = 204
    const innerHeight = 500
    const wrapper = _mount(`
      <el-scrollbar height="${outerHeight}px">
        <div style="height: ${innerHeight}px;"></div>
      </el-scrollbar>
    `)

    expect(wrapper.find('.el-scrollbar__wrap').attributes('style')).toContain(
      'height: 204px;'
    )
  })

  test('should render max-height props', async () => {
    const outerHeight = 204
    const innerHeight = 100
    const wrapper = _mount(`
      <el-scrollbar max-height="${outerHeight}px">
        <div style="height: ${innerHeight}px;"></div>
      </el-scrollbar>
    `)

    expect(wrapper.find('.el-scrollbar__wrap').attributes('style')).toContain(
      'max-height: 204px;'
    )
  })

  test('should render always props', async () => {
    const outerHeight = 204
    const innerHeight = 500
    const wrapper = _mount(`
      <el-scrollbar height="${outerHeight}px" always>
        <div style="height: ${innerHeight}px;"></div>
      </el-scrollbar>
    `)

    expect(wrapper.find('.el-scrollbar__bar').attributes('style')).toBeFalsy()
  })

  test('set scrollTop & scrollLeft', async () => {
    const outerHeight = 204
    const innerHeight = 500
    const outerWidth = 204
    const innerWidth = 500
    const wrapper = _mount(`
      <el-scrollbar ref="scrollbar" style="height: ${outerHeight}px; width: ${outerWidth}px;">
        <div style="height: ${innerHeight}px; width: ${innerWidth}px;"></div>
      </el-scrollbar>
    `)

    const scrollbar = wrapper.vm.$refs.scrollbar as any
    const scrollDom = wrapper.find('.el-scrollbar__wrap').element

    const offsetHeightRestore = defineGetter(
      scrollDom,
      'offsetHeight',
      outerHeight
    )
    const scrollHeightRestore = defineGetter(
      scrollDom,
      'scrollHeight',
      innerHeight
    )
    const offsetWidthRestore = defineGetter(
      scrollDom,
      'offsetWidth',
      outerWidth
    )
    const scrollWidthRestore = defineGetter(
      scrollDom,
      'scrollWidth',
      innerWidth
    )

    scrollbar.setScrollTop(100)
    await nextTick()
    scrollbar.setScrollLeft(100)
    await nextTick()

    expect(wrapper.find('.is-vertical div').attributes('style')).toContain(
      'height: 80px; transform: translateY(0%);'
    )
    expect(wrapper.find('.is-horizontal div').attributes('style')).toContain(
      'width: 80px; transform: translateX(0%);'
    )

    offsetHeightRestore()
    scrollHeightRestore()
    offsetWidthRestore()
    scrollWidthRestore()
  })

  test('should render min-size props', async () => {
    const outerHeight = 204
    const innerHeight = 10000
    const wrapper = _mount(`
      <el-scrollbar style="height: ${outerHeight}px">
        <div style="height: ${innerHeight}px;"></div>
      </el-scrollbar>
    `)

    const scrollDom = wrapper.find('.el-scrollbar__wrap').element

    const offsetHeightRestore = defineGetter(
      scrollDom,
      'offsetHeight',
      outerHeight
    )
    const scrollHeightRestore = defineGetter(
      scrollDom,
      'scrollHeight',
      innerHeight
    )

    await makeScroll(scrollDom, 'scrollTop', 0)
    expect(wrapper.find('.is-vertical div').attributes('style')).toContain(
      'height: 20px; transform: translateY(0%);'
    )
    offsetHeightRestore()
    scrollHeightRestore()
  })
})