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import { useState } from 'react' |
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|
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export interface UseSelection<T, K> { |
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selectAll: VoidFunction |
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toggleItem: (itemKey: K) => void |
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selectedItems: Set<K> |
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isAllSelected: boolean |
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availableItems: T[] |
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clearSelection: VoidFunction |
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getSelectedItems: () => T[] |
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} |
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|
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export const useSelection = <T, K>(availableItems: T[], getKey: (item: T) => K): UseSelection<T, K> => { |
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const [selectedItems, setSelectedItems] = useState<Set<K>>(new Set()) |
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|
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const toggleItem = (itemKey: K) => { |
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const newSelected = new Set(selectedItems) |
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|
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if (newSelected.has(itemKey)) { |
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newSelected.delete(itemKey) |
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} else { |
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newSelected.add(itemKey) |
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} |
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|
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setSelectedItems(newSelected) |
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} |
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|
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const selectAll = () => { |
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if (selectedItems.size === availableItems.length) { |
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clearSelection() |
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} else { |
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setSelectedItems(new Set(availableItems.map(getKey))) |
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} |
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} |
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|
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const clearSelection = () => { |
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setSelectedItems(new Set()) |
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} |
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|
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const getSelectedItems = () => |
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availableItems.filter(item => |
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selectedItems.has(getKey(item))) |
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|
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const isAllSelected = selectedItems.size === availableItems.length && 0 < availableItems.length |
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|
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return { |
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availableItems, |
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selectedItems, |
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toggleItem, |
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selectAll, |
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clearSelection, |
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getSelectedItems, |
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isAllSelected |
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} |
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} |
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