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Grzegorz Tańczyk
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Apr 21, 2024
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Original file line number | Diff line number | Diff line change |
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import React, { createContext, useContext, useReducer } from 'react'; | ||
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import { LaunchSite } from '../world/world-state-types'; | ||
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type SelectionDispatchAction = | ||
| { | ||
action: 'clear'; | ||
} | ||
| { | ||
action: 'set'; | ||
object: LaunchSite; | ||
}; | ||
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type Selection = { | ||
selectedObject?: LaunchSite; | ||
}; | ||
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const initialSelection: Selection = {}; | ||
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const selectionReducer: React.Reducer<Selection, SelectionDispatchAction> = ( | ||
selection: Selection, | ||
action: SelectionDispatchAction, | ||
) => { | ||
if (action.action === 'clear') { | ||
return initialSelection; | ||
} else if (action.action === 'set') { | ||
return { ...selection, selectedObject: action.object }; | ||
} else { | ||
return selection; | ||
} | ||
}; | ||
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// definition of react context for selection | ||
const SelectionContext = createContext<Selection>(initialSelection); | ||
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// definition of dispatch function for selection context | ||
const SelectionDispatchContext = createContext<React.Dispatch<SelectionDispatchAction>>(selectionReducer); | ||
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export function SelectionContextWrapper({ children }: { children: React.ReactNode }) { | ||
const [selection, reducer] = useReducer(selectionReducer, initialSelection); | ||
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return ( | ||
<SelectionContext.Provider value={selection}> | ||
<SelectionDispatchContext.Provider value={reducer}>{children}</SelectionDispatchContext.Provider> | ||
</SelectionContext.Provider> | ||
); | ||
} | ||
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export function useObjectSelection(object: LaunchSite) { | ||
const dispatch = useContext(SelectionDispatchContext); | ||
const selection = useContext(SelectionContext); | ||
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return [selection.selectedObject?.id === object.id, () => dispatch({ action: 'set', object })] as const; | ||
} | ||
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export function useClearSelection() { | ||
const dispatch = useContext(SelectionDispatchContext); | ||
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return () => dispatch({ action: 'clear' }); | ||
} |
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