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truewhile
103 lines
3.3 KiB
TypeScript
103 lines
3.3 KiB
TypeScript
import {
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isJumpIntentKey,
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isScrollIntentKey,
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shouldPersistClampedSample,
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shouldPersistScrollSample,
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shouldRememberScroll,
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} from './useScrollMemory.ts'
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function check(name: string, condition: boolean) {
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if (!condition) throw new Error(`useScrollMemory: ${name}`)
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}
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check('home remembers scroll', shouldRememberScroll('/'))
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check('library list remembers scroll', shouldRememberScroll('/libraries'))
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check('library detail remembers scroll', shouldRememberScroll('/library/lib-1'))
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check('library series panel remembers scroll', shouldRememberScroll('/library/lib-1'))
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check('media detail remembers scroll', shouldRememberScroll('/media/media-1'))
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check('settings does not remember scroll', !shouldRememberScroll('/settings'))
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check('player does not remember scroll', !shouldRememberScroll('/play/media-1'))
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check(
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'route transition collapse is ignored',
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!shouldPersistScrollSample({
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current: 0,
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lastSaved: 1800,
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height: 400,
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lastHeight: 4200,
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}),
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)
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check(
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'intentional scroll to top is persisted',
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shouldPersistScrollSample({
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current: 0,
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lastSaved: 1800,
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height: 4200,
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lastHeight: 4200,
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}),
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)
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check(
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'normal downward scroll is persisted',
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shouldPersistScrollSample({
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current: 1900,
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lastSaved: 1800,
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height: 4200,
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lastHeight: 4200,
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}),
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)
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check(
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'content growth still allows persist',
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shouldPersistScrollSample({
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current: 1800,
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lastSaved: 1800,
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height: 5200,
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lastHeight: 4200,
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}),
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)
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// 恢复途中内容还没长出来（滚不动）或被钳在矮内容底部时，scrollTop 是浏览器钳制
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// 出来的值，不能写回存储，否则一次误触就把记忆位置清成 0。
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check(
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'clamped sample while list is still loading is ignored',
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!shouldPersistClampedSample({ current: 0, maxScroll: 0, saved: 1800 }),
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)
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check(
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'clamped sample at the bottom of a shrunken list is ignored',
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!shouldPersistClampedSample({ current: 1200, maxScroll: 1200, saved: 1800 }),
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)
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check(
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'sample at the bottom of a completely scrolled list stays persistable',
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shouldPersistClampedSample({ current: 1800, maxScroll: 1800, saved: 1800 }),
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)
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check(
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'reachable scroll position is persisted',
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shouldPersistClampedSample({ current: 900, maxScroll: 1200, saved: 1800 }),
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)
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check(
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'reaching the remembered target is persisted',
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shouldPersistClampedSample({ current: 1800, maxScroll: 2600, saved: 1800 }),
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)
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check(
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'deeper than the remembered target is persisted',
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shouldPersistClampedSample({ current: 3000, maxScroll: 4000, saved: 1800 }),
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)
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check(
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'intentional scroll to top of a tall list is persisted',
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shouldPersistClampedSample({ current: 0, maxScroll: 4000, saved: 1800 }),
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)
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check(
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'unscrollable page without memory cannot persist',
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!shouldPersistClampedSample({ current: 0, maxScroll: 0, saved: 0 }),
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)
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check('page down counts as scroll intent', isScrollIntentKey('PageDown'))
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check('space counts as scroll intent', isScrollIntentKey(' '))
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check('typing does not count as scroll intent', !isScrollIntentKey('a'))
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check('shortcut does not count as scroll intent', !isScrollIntentKey('Meta'))
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check('page down allows a long jump', isJumpIntentKey('PageDown'))
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check('home allows a long jump', isJumpIntentKey('Home'))
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check('arrow key keeps smooth-only intent', !isJumpIntentKey('ArrowDown'))
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check('space keeps smooth-only intent', !isJumpIntentKey(' '))
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console.log('useScrollMemory.test.ts ok')
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