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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| import { renderHook, act } from 'react-hooks-testing-library' | ||
| import { useUndo } from '../src' | ||
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| test('useUndo', () => { | ||
| const { result } = renderHook(() => useUndo(0)) | ||
| expect(result.current.present).toEqual(0) | ||
| expect(result.current.past).toEqual([]) | ||
| expect(result.current.future).toEqual([]) | ||
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|
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| act(() => result.current.set(prev => prev + 1)) | ||
| expect(result.current.past).toEqual([0]) | ||
| expect(result.current.present).toEqual(1) | ||
| expect(result.current.future).toEqual([]) | ||
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|
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| act(() => result.current.set(prev => prev + 1)) | ||
| expect(result.current.past).toEqual([0, 1]) | ||
| expect(result.current.present).toEqual(2) | ||
| expect(result.current.future).toEqual([]) | ||
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| act(() => result.current.undo()) | ||
| expect(result.current.past).toEqual([0]) | ||
| expect(result.current.present).toEqual(1) | ||
| expect(result.current.future).toEqual([2]) | ||
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| act(() => result.current.undo()) | ||
| expect(result.current.past).toEqual([]) | ||
| expect(result.current.present).toEqual(0) | ||
| expect(result.current.future).toEqual([1, 2]) | ||
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| act(() => result.current.redo()) | ||
| expect(result.current.past).toEqual([0]) | ||
| expect(result.current.present).toEqual(1) | ||
| expect(result.current.future).toEqual([2]) | ||
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| act(() => result.current.set(3)) | ||
| expect(result.current.past).toEqual([0, 1]) | ||
| expect(result.current.present).toEqual(3) | ||
| expect(result.current.future).toEqual([]) | ||
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| act(() => { | ||
| result.current.undo() | ||
| result.current.undo() | ||
| result.current.undo() | ||
| }) | ||
| expect(result.current.past).toEqual([]) | ||
| expect(result.current.present).toEqual(0) | ||
| expect(result.current.future).toEqual([1, 3]) | ||
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| act(() => { | ||
| result.current.redo() | ||
| result.current.redo() | ||
| result.current.redo() | ||
| }) | ||
| expect(result.current.past).toEqual([0, 1]) | ||
| expect(result.current.present).toEqual(3) | ||
| expect(result.current.future).toEqual([]) | ||
| }) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| import useMergeState from './useMergeState' | ||
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| const useUndo = (initial) => { | ||
| const { | ||
| state, | ||
| set, | ||
| } = useMergeState({ | ||
| past: [], | ||
| present: initial, | ||
| future: [], | ||
| }) | ||
| const undo = () => { | ||
| set((prevState) => { | ||
| const { past, present, future } = prevState | ||
| if (past.length === 0) { | ||
| return prevState | ||
| } | ||
| const previous = past[past.length - 1] | ||
| return { | ||
| past: past.slice(0, past.length - 1), | ||
| present: previous, | ||
| future: [present, ...future], | ||
| } | ||
| }) | ||
| } | ||
| const redo = () => { | ||
| set((prevState) => { | ||
| const { past, present, future } = prevState | ||
| if (future.length === 0) { | ||
| return prevState | ||
| } | ||
| const [next, ...restFuture] = future | ||
| return { | ||
| past: [...past, present], | ||
| present: next, | ||
| future: restFuture, | ||
| } | ||
| }) | ||
| } | ||
| const setPresent = updater => set(({ present, past }) => ({ | ||
| past: [...past, present], | ||
| present: typeof updater === 'function' ? updater(present) : updater, | ||
| future: [], | ||
| })) | ||
| return { | ||
| ...state, | ||
| undo, | ||
| redo, | ||
| set: setPresent, | ||
| } | ||
| } | ||
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| export default useUndo |
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