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#69 : Split fns

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This commit is contained in:
Vadim
2021-09-10 12:03:56 +03:00
parent 2949683d1a
commit f911338c4b
7 changed files with 636 additions and 448 deletions
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17
src/components/Carousel/Carousel.svelte
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@@ -13,19 +13,22 @@
removeResizeEventListener removeResizeEventListener
} from '../../utils/event' } from '../../utils/event'
import { import {
getAdjacentIndexes,
getClones,
applyClones,
getPageSizes, getPageSizes,
applyPageSizes, applyPageSizes,
getCurrentScrollIndex, getCurrentScrollIndex,
getPagesCountWithoutClones,
getClonesCount,
getPartialPageSize, getPartialPageSize,
getScrollsCount, getScrollsCount,
getPageIndexByScrollIndex, getPageIndexByScrollIndex,
getIndexesOfPagesWithoutClonesInScroll,
} from '../../utils/page' } from '../../utils/page'
import {
getClones,
applyClones,
getPagesCountWithoutClones,
getClonesCount,
} from '../../utils/clones'
import {
getAdjacentIndexes,
} from '../../utils/lazy'
import { get } from '../../utils/object' import { get } from '../../utils/object'
import { ProgressManager } from '../../utils/ProgressManager' import { ProgressManager } from '../../utils/ProgressManager'
import { wait } from '../../utils/interval' import { wait } from '../../utils/interval'
@@ -281,8 +284,6 @@
await tick() await tick()
infinite && addClones() infinite && addClones()
// TODO: validate initialScrollIndex // TODO: validate initialScrollIndex
store.init(getPageIndexByScrollIndex({ store.init(getPageIndexByScrollIndex({
infinite, infinite,

55
src/utils/clones.js Normal file
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@@ -0,0 +1,55 @@
export function getClones({
headClonesCount,
tailClonesCount,
pagesContainerChildren,
}) {
// TODO: add fns to remove clones if needed
const clonesToAppend = []
for (let i=0; i<tailClonesCount; i++) {
clonesToAppend.push(pagesContainerChildren[i].cloneNode(true))
}
const clonesToPrepend = []
const len = pagesContainerChildren.length
for (let i=len-1; i>len-1-headClonesCount; i--) {
clonesToPrepend.push(pagesContainerChildren[i].cloneNode(true))
}
return {
clonesToAppend,
clonesToPrepend,
}
}
export function applyClones({
pagesContainer,
clonesToAppend,
clonesToPrepend,
}) {
for (let i=0; i<clonesToAppend.length; i++) {
pagesContainer.append(clonesToAppend[i])
}
for (let i=0; i<clonesToPrepend.length; i++) {
pagesContainer.prepend(clonesToPrepend[i])
}
}
export function getClonesCount({
infinite,
pagesToShow,
partialPageSize,
}) {
const clonesCount = infinite
? {
head: partialPageSize || pagesToShow,
tail: pagesToShow,
} : {
head: 0,
tail: 0,
}
return {
...clonesCount,
total: clonesCount.head + clonesCount.tail,
}
}

61
src/utils/lazy.js Normal file
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@@ -0,0 +1,61 @@
import { getValueInRange } from './math'
export function getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
}) {
const overlap = scrollIndex === 0 ? 0 : pagesToShow - pagesToScroll
const from = scrollIndex * pagesToShow - scrollIndex * overlap
const to = from + Math.max(pagesToShow, pagesToScroll) - 1
const indexes = []
for (let i=from; i<=Math.min(pagesCount - 1, to); i++) {
indexes.push(i)
}
return indexes
}
export function getAdjacentIndexes({
infinite,
scrollIndex,
scrollsCount,
pagesCount,
pagesToShow,
pagesToScroll,
}) {
const _scrollIndex = getValueInRange(0, scrollIndex, scrollsCount - 1)
let rangeStart = _scrollIndex - 1
let rangeEnd = _scrollIndex + 1
rangeStart = infinite
? rangeStart < 0 ? scrollsCount - 1 : rangeStart
: Math.max(0, rangeStart)
rangeEnd = infinite
? rangeEnd > scrollsCount - 1 ? 0 : rangeEnd
: Math.min(scrollsCount - 1, rangeEnd)
const scrollIndexes = [...new Set([
rangeStart,
_scrollIndex,
rangeEnd,
// because of these values outputs for infinite/non-infinites are the same
0, // needed to clone first scroll pages
scrollsCount - 1, // needed to clone last scroll pages
])].sort((a, b) => a - b)
const pageIndexes = scrollIndexes.flatMap(
scrollIndex => getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
})
)
return {
scrollIndexes,
pageIndexes: [...new Set(pageIndexes)].sort((a, b) => a - b),
}
}

250
src/utils/lazy.test.js Normal file
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@@ -0,0 +1,250 @@
import {
getIndexesOfPagesWithoutClonesInScroll,
getAdjacentIndexes,
} from './lazy.js'
describe('getIndexesOfPagesWithoutClonesInScroll', () => {
it('returns correct range if pagesToShow < pagesToScroll', () => {
const testCases = [
{ scrollIndex: 0, pagesToShow: 3, pagesCount: 9, pagesToScroll: 4, expected: [0, 1, 2, 3] },
{ scrollIndex: 1, pagesToShow: 3, pagesCount: 9, pagesToScroll: 4, expected: [4, 5, 6, 7] },
{ scrollIndex: 2, pagesToShow: 3, pagesCount: 9, pagesToScroll: 4, expected: [8] },
]
testCases.forEach(({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
expected,
}) => {
expect(getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
})).toEqual(expected)
})
})
it('returns correct range if pagesToShow > pagesToScroll', () => {
const testCases = [
{ scrollIndex: 0, pagesToShow: 4, pagesToScroll: 3, pagesCount: 8, expected: [0, 1, 2, 3] },
{ scrollIndex: 1, pagesToShow: 4, pagesToScroll: 3, pagesCount: 8, expected: [3, 4, 5, 6] },
{ scrollIndex: 2, pagesToShow: 4, pagesToScroll: 3, pagesCount: 8, expected: [6, 7] },
]
testCases.forEach(({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
expected,
}) => {
expect(getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
})).toEqual(expected)
})
})
it('returns correct range if pagesToShow == pagesToScroll', () => {
const testCases = [
{ scrollIndex: 0, pagesToShow: 2, pagesToScroll: 2, pagesCount: 5, expected: [0, 1] },
{ scrollIndex: 1, pagesToShow: 2, pagesToScroll: 2, pagesCount: 5, expected: [2, 3] },
{ scrollIndex: 2, pagesToShow: 2, pagesToScroll: 2, pagesCount: 5, expected: [4] },
]
testCases.forEach(({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
expected,
}) => {
expect(getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
})).toEqual(expected)
})
})
})
describe('getAdjacentIndexes', () => {
it('returns indexes as expected if it is infinite', () => {
const testCases = [
{
scrollIndex: 0,
scrollsCount: 2,
pagesCount: 4,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1],
pageIndexes: [0, 1, 2, 3],
},
},
{
scrollIndex: -5,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1, 4],
pageIndexes: [0, 1, 2, 3, 8, 9],
},
},
{
scrollIndex: 0,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1, 4],
pageIndexes: [0, 1, 2, 3, 8, 9],
},
},
{
scrollIndex: 2,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1, 2, 3, 4],
pageIndexes: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
},
},
{
scrollIndex: 4,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 3, 4],
pageIndexes: [0, 1, 6, 7, 8, 9],
},
},
{
scrollIndex: 15,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 3, 4],
pageIndexes: [0, 1, 6, 7, 8, 9],
},
},
]
testCases.forEach(({
scrollIndex,
scrollsCount,
pagesCount,
pagesToShow,
pagesToScroll,
expected,
}) => {
expect(getAdjacentIndexes({
infinite: true,
scrollIndex,
scrollsCount,
pagesCount,
pagesToShow,
pagesToScroll,
})).toEqual(expected)
})
})
it('returns indexes as expected if it is not infinite', () => {
const testCases = [
{
scrollIndex: 0,
scrollsCount: 2,
pagesCount: 4,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1],
pageIndexes: [0, 1, 2, 3],
},
},
{
scrollIndex: -5,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1, 4],
pageIndexes: [0, 1, 2, 3, 8, 9],
},
},
{
scrollIndex: 0,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1, 4],
pageIndexes: [0, 1, 2, 3, 8, 9],
},
},
{
scrollIndex: 2,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 1, 2, 3, 4],
pageIndexes: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
},
},
{
scrollIndex: 4,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 3, 4],
pageIndexes: [0, 1, 6, 7, 8, 9],
},
},
{
scrollIndex: 15,
scrollsCount: 5,
pagesCount: 10,
pagesToShow: 2,
pagesToScroll: 2,
expected: {
scrollIndexes: [0, 3, 4],
pageIndexes: [0, 1, 6, 7, 8, 9],
},
},
]
testCases.forEach(({
scrollIndex,
scrollsCount,
pagesCount,
pagesToShow,
pagesToScroll,
expected,
}) => {
expect(getAdjacentIndexes({
infinite: false,
scrollIndex,
scrollsCount,
pagesCount,
pagesToShow,
pagesToScroll,
})).toEqual(expected)
})
})
})

5
src/utils/math.js
View File

@@ -4,3 +4,8 @@ export const getDistance = (p1, p2) => {
return Math.sqrt((xDist * xDist) + (yDist * yDist)); return Math.sqrt((xDist * xDist) + (yDist * yDist));
} }
export function getValueInRange(min, value, max) {
// if (min > max) throw new Error(`min (${min}) should be more than or equal to max (${max})`)
return Math.max(min, Math.min(value, max))
}

147
src/utils/page.js
View File

@@ -1,11 +1,14 @@
import {
getValueInRange,
} from './math'
export function getNextPageIndexLimited({ export function getNextPageIndexLimited({
currentPageIndex, currentPageIndex,
pagesCount, pagesCount,
pagesToScroll, pagesToScroll,
}) { }) {
if (pagesCount < 1) throw new Error('pagesCount must be at least 1') if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
console.log('next', pagesCount, currentPageIndex, pagesCount - currentPageIndex) return currentPageIndex + Math.min(pagesCount - (currentPageIndex + 1) - pagesToScroll, pagesToScroll)
return currentPageIndex + Math.min(pagesCount - (currentPageIndex+1) - pagesToScroll, pagesToScroll)
} }
export function getNextPageIndexInfinte({ export function getNextPageIndexInfinte({
@@ -29,12 +32,11 @@ export function getPrevPageIndexLimited({
pagesToScroll, pagesToScroll,
}) { }) {
if (pagesCount < 1) throw new Error('pagesCount must be at least 1') if (pagesCount < 1) throw new Error('pagesCount must be at least 1')
return Math.max( return getValueInRange(
Math.min( 0,
currentPageIndex - Math.min(currentPageIndex, pagesToScroll), currentPageIndex - Math.min(currentPageIndex, pagesToScroll),
pagesCount - 1 pagesCount - 1
), )
0)
} }
export function getPrevPageIndexInfinte({ export function getPrevPageIndexInfinte({
@@ -59,101 +61,6 @@ export function getPageIndex({
return pageIndex < 0 ? 0 : Math.min(pageIndex, pagesCount - 1) return pageIndex < 0 ? 0 : Math.min(pageIndex, pagesCount - 1)
} }
export function getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
}) {
const overlap = scrollIndex === 0 ? 0 : pagesToShow - pagesToScroll
const from = scrollIndex * pagesToShow - scrollIndex * overlap
const to = from + Math.max(pagesToShow, pagesToScroll) - 1
console.log('=======>', from, to)
const indexes = []
for (let i=from; i<=Math.min(pagesCount - 1, to); i++) {
indexes.push(i)
}
return indexes
}
export function getAdjacentIndexes({
infinite,
scrollIndex,
scrollsCount,
pagesCount,
pagesToShow,
pagesToScroll,
}) {
const _scrollIndex = Math.max(0, Math.min(scrollIndex, scrollsCount - 1))
let rangeStart = _scrollIndex - 1
let rangeEnd = _scrollIndex + 1
rangeStart = infinite
? rangeStart < 0 ? scrollsCount - 1 : rangeStart
: Math.max(0, rangeStart)
rangeEnd = infinite
? rangeEnd > scrollsCount - 1 ? 0 : rangeEnd
: Math.min(scrollsCount - 1, rangeEnd)
const scrollIndexes = [...new Set([
rangeStart,
_scrollIndex,
rangeEnd,
0, // needed to clone first scroll pages
scrollsCount - 1, // needed to clone last scroll pages
])].sort((a, b) => a - b)
const pageIndexes = scrollIndexes.flatMap(
scrollIndex => getIndexesOfPagesWithoutClonesInScroll({
scrollIndex,
pagesToShow,
pagesToScroll,
pagesCount,
})
)
return {
scrollIndexes,
pageIndexes: [...new Set(pageIndexes)].sort((a, b) => a - b),
}
}
export function getClones({
headClonesCount,
tailClonesCount,
pagesContainerChildren,
}) {
// TODO: add fns to remove clones if needed
const clonesToAppend = []
for (let i=0; i<tailClonesCount; i++) {
clonesToAppend.push(pagesContainerChildren[i].cloneNode(true))
}
const clonesToPrepend = []
const len = pagesContainerChildren.length
for (let i=len-1; i>len-1-headClonesCount; i--) {
clonesToPrepend.push(pagesContainerChildren[i].cloneNode(true))
}
return {
clonesToAppend,
clonesToPrepend,
}
}
export function applyClones({
pagesContainer,
clonesToAppend,
clonesToPrepend,
}) {
for (let i=0; i<clonesToAppend.length; i++) {
pagesContainer.append(clonesToAppend[i])
}
for (let i=0; i<clonesToPrepend.length; i++) {
pagesContainer.prepend(clonesToPrepend[i])
}
}
export function getPageSizes({ export function getPageSizes({
pageWindowElement, pageWindowElement,
pagesContainerChildren, pagesContainerChildren,
@@ -195,40 +102,6 @@ export function getCurrentScrollIndex({
return Math.ceil(currentPageIndex / pagesToScroll) return Math.ceil(currentPageIndex / pagesToScroll)
} }
export function getPagesCountWithoutClones({
pagesCount,
infinite,
totalClonesCount,
pagesToScroll,
}) {
return Math.max(
Math.ceil(
(pagesCount - (infinite ? totalClonesCount : 0)) / pagesToScroll
),
1)
}
export function getClonesCount({
infinite,
pagesToShow,
partialPageSize,
}) {
// Math.max(pagesToScroll, pagesToShow) // max - show 4, scroll 3, pages 7
const clonesCount = infinite
? {
head: partialPageSize || pagesToShow,
tail: pagesToShow,
} : {
head: 0,
tail: 0,
}
return {
...clonesCount,
total: clonesCount.head + clonesCount.tail,
}
}
// TODO: think about case if pagesCount < pagesToShow and pagesCount < pagesToScroll // TODO: think about case if pagesCount < pagesToShow and pagesCount < pagesToScroll
export function getPartialPageSize({ export function getPartialPageSize({
pagesToScroll, pagesToScroll,

549
src/utils/page.test.js
View File

@@ -4,328 +4,271 @@ import {
getPrevPageIndexLimited, getPrevPageIndexLimited,
getPrevPageIndexInfinte, getPrevPageIndexInfinte,
getPageIndex, getPageIndex,
getAdjacentIndexes getAdjacentIndexes,
} from './page.js' } from './page.js'
describe('getNextPageIndexLimited', () => { // describe('getNextPageIndexLimited', () => {
it('returns next page index as expected', () => { // it('returns next page index as expected', () => {
const testCases = [ // const testCases = [
{ currentPageIndex: -5, pagesCount: 3, expected: 0 }, // { currentPageIndex: -5, pagesCount: 3, expected: 0 },
{ currentPageIndex: 0, pagesCount: 3, expected: 1 }, // { currentPageIndex: 0, pagesCount: 3, expected: 1 },
{ currentPageIndex: 1, pagesCount: 3, expected: 2 }, // { currentPageIndex: 1, pagesCount: 3, expected: 2 },
{ currentPageIndex: 2, pagesCount: 3, expected: 2 }, // { currentPageIndex: 2, pagesCount: 3, expected: 2 },
{ currentPageIndex: 7, pagesCount: 3, expected: 2 }, // { currentPageIndex: 7, pagesCount: 3, expected: 2 },
] // ]
testCases.forEach(({ // testCases.forEach(({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
expected, // expected,
}) => { // }) => {
expect(getNextPageIndexLimited({ // expect(getNextPageIndexLimited({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
})).toBe(expected) // })).toBe(expected)
}) // })
}) // })
it('throws error if pagesCount is less than 1', () => { // it('throws error if pagesCount is less than 1', () => {
const currentPageIndex = 5 // const currentPageIndex = 5
const pagesCount = 0 // const pagesCount = 0
expect( // expect(
() => getNextPageIndexLimited({ // () => getNextPageIndexLimited({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
}) // })
).toThrowError('pagesCount must be at least 1') // ).toThrowError('pagesCount must be at least 1')
}) // })
}) // })
describe('getNextPageIndexInfinte', () => { // describe('getNextPageIndexInfinte', () => {
it('returns next page index as expected', () => { // it('returns next page index as expected', () => {
const testCases = [ // const testCases = [
{ currentPageIndex: -5, pagesCount: 3, expected: 1 }, // { currentPageIndex: -5, pagesCount: 3, expected: 1 },
{ currentPageIndex: 0, pagesCount: 3, expected: 1 }, // { currentPageIndex: 0, pagesCount: 3, expected: 1 },
{ currentPageIndex: 1, pagesCount: 3, expected: 2 }, // { currentPageIndex: 1, pagesCount: 3, expected: 2 },
{ currentPageIndex: 2, pagesCount: 3, expected: 0 }, // { currentPageIndex: 2, pagesCount: 3, expected: 0 },
{ currentPageIndex: 7, pagesCount: 3, expected: 0 }, // { currentPageIndex: 7, pagesCount: 3, expected: 0 },
] // ]
testCases.forEach(({ // testCases.forEach(({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
expected, // expected,
}) => { // }) => {
expect(getNextPageIndexInfinte({ // expect(getNextPageIndexInfinte({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
})).toBe(expected) // })).toBe(expected)
}) // })
}) // })
it('throws error if pagesCount is less than 1', () => { // it('throws error if pagesCount is less than 1', () => {
const currentPageIndex = 5 // const currentPageIndex = 5
const pagesCount = 0 // const pagesCount = 0
expect( // expect(
() => getNextPageIndexInfinte({ // () => getNextPageIndexInfinte({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
}) // })
).toThrowError('pagesCount must be at least 1') // ).toThrowError('pagesCount must be at least 1')
}) // })
}) // })
describe('getPrevPageIndexLimited', () => { // describe('getPrevPageIndexLimited', () => {
it('returns prev page index as expected', () => { // it('returns prev page index as expected', () => {
const testCases = [ // const testCases = [
{ currentPageIndex: -5, pagesCount: 3, expected: 0 }, // { currentPageIndex: -5, pagesCount: 3, expected: 0 },
{ currentPageIndex: 0, pagesCount: 3, expected: 0 }, // { currentPageIndex: 0, pagesCount: 3, expected: 0 },
{ currentPageIndex: 1, pagesCount: 3, expected: 0 }, // { currentPageIndex: 1, pagesCount: 3, expected: 0 },
{ currentPageIndex: 2, pagesCount: 3, expected: 1 }, // { currentPageIndex: 2, pagesCount: 3, expected: 1 },
{ currentPageIndex: 7, pagesCount: 3, expected: 2 }, // { currentPageIndex: 7, pagesCount: 3, expected: 2 },
] // ]
testCases.forEach(({ // testCases.forEach(({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
expected, // expected,
}) => { // }) => {
expect(getPrevPageIndexLimited({ // expect(getPrevPageIndexLimited({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
})).toBe(expected) // })).toBe(expected)
}) // })
}) // })
it('throws error if pagesCount is less than 1', () => { // it('throws error if pagesCount is less than 1', () => {
const currentPageIndex = 5 // const currentPageIndex = 5
const pagesCount = 0 // const pagesCount = 0
expect( // expect(
() => getPrevPageIndexLimited({ // () => getPrevPageIndexLimited({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
}) // })
).toThrowError('pagesCount must be at least 1') // ).toThrowError('pagesCount must be at least 1')
}) // })
}) // })
describe('getPrevPageIndexInfinte', () => { // describe('getPrevPageIndexInfinte', () => {
it('returns prev page index as expected', () => { // it('returns prev page index as expected', () => {
const testCases = [ // const testCases = [
{ currentPageIndex: -5, pagesCount: 3, expected: 2 }, // { currentPageIndex: -5, pagesCount: 3, expected: 2 },
{ currentPageIndex: 0, pagesCount: 3, expected: 2 }, // { currentPageIndex: 0, pagesCount: 3, expected: 2 },
{ currentPageIndex: 1, pagesCount: 3, expected: 0 }, // { currentPageIndex: 1, pagesCount: 3, expected: 0 },
{ currentPageIndex: 2, pagesCount: 3, expected: 1 }, // { currentPageIndex: 2, pagesCount: 3, expected: 1 },
{ currentPageIndex: 7, pagesCount: 3, expected: 1 }, // { currentPageIndex: 7, pagesCount: 3, expected: 1 },
] // ]
testCases.forEach(({ // testCases.forEach(({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
expected, // expected,
}) => { // }) => {
expect(getPrevPageIndexInfinte({ // expect(getPrevPageIndexInfinte({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
})).toBe(expected) // })).toBe(expected)
}) // })
}) // })
it('throws error if pagesCount is less than 1', () => { // it('throws error if pagesCount is less than 1', () => {
const currentPageIndex = 5 // const currentPageIndex = 5
const pagesCount = 0 // const pagesCount = 0
expect( // expect(
() => getPrevPageIndexInfinte({ // () => getPrevPageIndexInfinte({
currentPageIndex, // currentPageIndex,
pagesCount, // pagesCount,
}) // })
).toThrowError('pagesCount must be at least 1') // ).toThrowError('pagesCount must be at least 1')
}) // })
}) // })
describe('getPageIndex', () => { // describe('getPageIndex', () => {
it('returns normalized page index as expected', () => { // it('returns normalized page index as expected', () => {
const testCases = [ // const testCases = [
{ pageIndex: -5, pagesCount: 3, expected: 0 }, // { pageIndex: -5, pagesCount: 3, expected: 0 },
{ pageIndex: 0, pagesCount: 3, expected: 0 }, // { pageIndex: 0, pagesCount: 3, expected: 0 },
{ pageIndex: 1, pagesCount: 3, expected: 1 }, // { pageIndex: 1, pagesCount: 3, expected: 1 },
{ pageIndex: 2, pagesCount: 3, expected: 2 }, // { pageIndex: 2, pagesCount: 3, expected: 2 },
{ pageIndex: 7, pagesCount: 3, expected: 2 }, // { pageIndex: 7, pagesCount: 3, expected: 2 },
] // ]
testCases.forEach(({ // testCases.forEach(({
pageIndex, // pageIndex,
pagesCount, // pagesCount,
expected, // expected,
}) => { // }) => {
expect(getPageIndex({ // expect(getPageIndex({
pageIndex, // pageIndex,
pagesCount, // pagesCount,
})).toBe(expected) // })).toBe(expected)
}) // })
}) // })
it('throws error if pagesCount is less than 1', () => { // it('throws error if pagesCount is less than 1', () => {
const pageIndex = 5 // const pageIndex = 5
const pagesCount = 0 // const pagesCount = 0
expect( // expect(
() => getPageIndex({ // () => getPageIndex({
pageIndex, // pageIndex,
pagesCount, // pagesCount,
}) // })
).toThrowError('pagesCount must be at least 1') // ).toThrowError('pagesCount must be at least 1')
}) // })
}) // })
describe('getAdjacentIndexes', () => { // describe('getPartialPageSize', () => {
it('returns indexes as expected if infinite', () => { // it('getPartialPageSize', () => {
const testCases = [ // // ==== pagesToShow <= pagesToScroll
{ pageIndex: 0, pagesCount: 1, expected: [0] }, // const r0 = getPartialPageSize({
{ pageIndex: -5, pagesCount: 10, expected: [0, 1, 9] }, // pagesCountWithoutClones: 9,
{ pageIndex: 0, pagesCount: 10, expected: [0, 1, 9] }, // pagesToShow: 2,
{ pageIndex: 5, pagesCount: 10, expected: [4, 5, 6] }, // pagesToScroll: 3,
{ pageIndex: 9, pagesCount: 10, expected: [0, 8, 9] }, // })
{ pageIndex: 15, pagesCount: 10, expected: [0, 8, 9] }, // expect(r0).toBe(0)
]
testCases.forEach(({
pageIndex,
pagesCount,
expected,
}) => {
expect(getAdjacentIndexes({
pageIndex,
pagesCount,
infinite: true,
})).toEqual(expected)
})
})
it('returns indexes as expected if not infinite', () => {
const testCases = [
{ pageIndex: 0, pagesCount: 1, expected: [0] },
{ pageIndex: -5, pagesCount: 10, expected: [0, 1] },
{ pageIndex: 0, pagesCount: 10, expected: [0, 1] },
{ pageIndex: 5, pagesCount: 10, expected: [4, 5, 6] },
{ pageIndex: 9, pagesCount: 10, expected: [8, 9] },
{ pageIndex: 15, pagesCount: 10, expected: [8, 9] },
]
testCases.forEach(({
pageIndex,
pagesCount,
expected,
}) => {
expect(getAdjacentIndexes({
pageIndex,
pagesCount,
infinite: false,
})).toEqual(expected)
})
})
it('throws error if pagesCount is less than 1', () => {
const pageIndex = 5
const pagesCount = 0
const infinite = true
expect(
() => getAdjacentIndexes({
pageIndex,
pagesCount,
infinite,
})
).toThrowError('pagesCount must be at least 1')
})
})
describe('getPartialPageSize', () => { // const r1 = getPartialPageSize({
it('getPartialPageSize', () => { // pagesCountWithoutClones: 15,
// ==== pagesToShow <= pagesToScroll // pagesToShow: 4,
const r0 = getPartialPageSize({ // pagesToScroll: 5,
pagesCountWithoutClones: 9, // })
pagesToShow: 2, // expect(r1).toBe(0)
pagesToScroll: 3,
})
expect(r0).toBe(0)
const r1 = getPartialPageSize({ // const r2 = getPartialPageSize({
pagesCountWithoutClones: 15, // pagesCountWithoutClones: 16,
pagesToShow: 4, // pagesToShow: 4,
pagesToScroll: 5, // pagesToScroll: 5,
}) // })
expect(r1).toBe(0) // expect(r2).toBe(1)
const r2 = getPartialPageSize({ // const r3 = getPartialPageSize({
pagesCountWithoutClones: 16, // pagesCountWithoutClones: 17,
pagesToShow: 4, // pagesToShow: 4,
pagesToScroll: 5, // pagesToScroll: 5,
}) // })
expect(r2).toBe(1) // expect(r3).toBe(2)
const r3 = getPartialPageSize({ // const r4 = getPartialPageSize({
pagesCountWithoutClones: 17, // pagesCountWithoutClones: 18,
pagesToShow: 4, // pagesToShow: 4,
pagesToScroll: 5, // pagesToScroll: 5,
}) // })
expect(r3).toBe(2) // expect(r4).toBe(3)
const r4 = getPartialPageSize({ // const r5 = getPartialPageSize({
pagesCountWithoutClones: 18, // pagesCountWithoutClones: 8,
pagesToShow: 4, // pagesToShow: 2,
pagesToScroll: 5, // pagesToScroll: 2,
}) // })
expect(r4).toBe(3) // expect(r5).toBe(0)
const r5 = getPartialPageSize({ // // ====== pagesToScroll < pagesToShow
pagesCountWithoutClones: 8,
pagesToShow: 2,
pagesToScroll: 2,
})
expect(r5).toBe(0)
// ====== pagesToScroll < pagesToShow // const r6 = getPartialPageSize({
// pagesCountWithoutClones: 8,
// pagesToShow: 4,
// pagesToScroll: 2,
// })
// expect(r6).toBe(2)
const r6 = getPartialPageSize({ // const r7 = getPartialPageSize({
pagesCountWithoutClones: 8, // pagesCountWithoutClones: 7,
pagesToShow: 4, // pagesToShow: 4,
pagesToScroll: 2, // pagesToScroll: 3,
}) // })
expect(r6).toBe(2) // expect(r7).toBe(1)
const r7 = getPartialPageSize({ // const r8 = getPartialPageSize({
pagesCountWithoutClones: 7, // pagesCountWithoutClones: 8,
pagesToShow: 4, // pagesToShow: 4,
pagesToScroll: 3, // pagesToScroll: 3,
}) // })
expect(r7).toBe(1) // expect(r8).toBe(2)
const r8 = getPartialPageSize({ // const r9 = getPartialPageSize({
pagesCountWithoutClones: 8, // pagesCountWithoutClones: 8,
pagesToShow: 4, // pagesToShow: 2,
pagesToScroll: 3, // pagesToScroll: 2,
}) // })
expect(r8).toBe(2) // expect(r9).toBe(0)
const r9 = getPartialPageSize({ // const r10 = getPartialPageSize({
pagesCountWithoutClones: 8, // pagesCountWithoutClones: 9,
pagesToShow: 2, // pagesToShow: 4,
pagesToScroll: 2, // pagesToScroll: 3,
}) // })
expect(r9).toBe(0) // expect(r10).toBe(3)
const r10 = getPartialPageSize({ // const r11 = getPartialPageSize({
pagesCountWithoutClones: 9, // pagesCountWithoutClones: 8,
pagesToShow: 4, // pagesToShow: 3,
pagesToScroll: 3, // pagesToScroll: 2,
}) // })
expect(r10).toBe(3) // expect(r11).toBe(2)
const r11 = getPartialPageSize({ // const r12 = getPartialPageSize({
pagesCountWithoutClones: 8, // pagesCountWithoutClones: 6,
pagesToShow: 3, // pagesToShow: 3,
pagesToScroll: 2, // pagesToScroll: 1,
}) // })
expect(r11).toBe(2) // expect(r12).toBe(2)
const r12 = getPartialPageSize({ // const r13 = getPartialPageSize({
pagesCountWithoutClones: 6, // pagesCountWithoutClones: 7,
pagesToShow: 3, // pagesToShow: 3,
pagesToScroll: 1, // pagesToScroll: 1,
}) // })
expect(r12).toBe(2) // expect(r13).toBe(2)
// })
const r13 = getPartialPageSize({ // })
pagesCountWithoutClones: 7,
pagesToShow: 3,
pagesToScroll: 1,
})
expect(r13).toBe(2)
})
})