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36 changes: 36 additions & 0 deletions
36
src/components/LayoutWrapperAccountSettingsSideNav/hookGlobalState.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| import { useEffect, useState } from 'react'; | ||
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| // Global state is useful in situations, where UI state needs to be tracked navigation history. | ||
| // Alternatively, Redux could be used too, but it's unnecessarily heavy to use for | ||
| // a single component to track it's internal UI state (e.g. "scroll position"). | ||
| // If more than one component is needing certain info, the recommendation is to use Redux. | ||
| // | ||
| // This piece of code is taken from Daishi Kato's blog: | ||
| // https://blog.axlight.com/posts/steps-to-develop-global-state-for-react/ | ||
| export const createGlobalState = initialState => { | ||
| let globalState = initialState; | ||
| const listeners = Object.fromEntries(Object.keys(initialState).map(key => [key, new Set()])); | ||
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| const setGlobalState = (key, nextValue) => { | ||
| globalState = { ...globalState, [key]: nextValue }; | ||
| listeners[key].forEach(listener => listener()); | ||
| }; | ||
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| const useGlobalState = key => { | ||
| const [state, setState] = useState(globalState[key]); | ||
| useEffect(() => { | ||
| const listener = () => { | ||
| setState(globalState[key]); | ||
| }; | ||
| listeners[key].add(listener); | ||
| listener(); // in case it's already changed | ||
| return () => listeners[key].delete(listener); // cleanup | ||
| }, []); | ||
| return [state, nextValue => setGlobalState(key, nextValue)]; | ||
| }; | ||
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| return { | ||
| setGlobalState, | ||
| useGlobalState, | ||
| }; | ||
| }; |
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