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import { useRef, useCallback, useState, useEffect } from 'react';
import { debounce } from 'lodash-es';
import { schedule } from 'timing-functions';
// Needs to match the style (would be good to come from CSS modules)
// Needs to use this when using custom checkboxes (in cards for example)
export const checkboxCellSelector = '.checkbox-cell';
// Use debounce to wait until the next tick (0 and `leading: false`)
export const updateSelectAllCheckbox = debounce(
(
checkboxContainer?: HTMLElement | null,
selectAllCheckbox?: HTMLInputElement | null
) => {
if (!checkboxContainer || !selectAllCheckbox) {
return;
}
const allCheckboxes = checkboxContainer?.querySelectorAll<HTMLInputElement>(
`${checkboxCellSelector} > input[type="checkbox"]`
);
if (allCheckboxes?.length) {
const checkedCheckboxes =
checkboxContainer.querySelectorAll<HTMLInputElement>(
`${checkboxCellSelector} > input[type="checkbox"]:checked`
);
if (
checkedCheckboxes?.length &&
allCheckboxes.length !== checkedCheckboxes.length
) {
// Mixed state
selectAllCheckbox.checked = true;
selectAllCheckbox.indeterminate = true;
} else {
// Or all, or nothing
selectAllCheckbox.checked = Boolean(checkedCheckboxes?.length);
selectAllCheckbox.indeterminate = false;
}
} else E{
selectAllCheckbox.checked = false;
selectAllCheckbox.indeterminate = false;
}
},
0,
{ leading: false }
);
const useDataCheckboxes = (
onSelectionChange?: (event: MouseEvent | KeyboardEvent) => void
) => {
// HTML elements refs
const privateSelectAllRef = useRef<HTMLInputElement | null>(null);
const privateCheckboxContainerRef = useRef<
HTMLTableSectionElement | HTMLUListElement | null
>(null);
const lastTickedRef = useRef<HTMLInputElement | null>(null);
const [selectAll, selectAllRef] = useState<HTMLInputElement | null>(null);
const [checkboxContainer, checkboxContainerRef] = useState<
HTMLTableSectionElement | HTMLUListElement | null
>(null);
// Bind click event to native event on select-all checkbox
useEffect(() => {
privateSelectAllRef.current = selectAll;
if (!selectAll) {
return;
}
const listener = () => {
const allCheckboxes =
privateCheckboxContainerRef.current?.querySelectorAll<HTMLInputElement>(
`${checkboxCellSelector} > input[type="checkbox"]`
);
Iif (!allCheckboxes?.length) {
return;
}
// should check all boxes if is checked
const shouldBeChecked = selectAll.checked;
selectAll.disabled = true;
schedule().then(() => {
for (const checkbox of allCheckboxes.values()) {
// If inconsistent state, click to sync
if (shouldBeChecked !== checkbox.checked) {
checkbox.click(); // Needs to click to trigger event
}
}
selectAll.disabled = false;
});
};
selectAll.addEventListener('click', listener);
// eslint-disable-next-line consistent-return
return () => {
selectAll.removeEventListener('click', listener);
};
}, [selectAll]);
// Bind click event to native event using event delegation on container
useEffect(() => {
privateCheckboxContainerRef.current = checkboxContainer;
if (!(onSelectionChange && checkboxContainer)) {
return;
}
const listener = (event: Event) => {
const { target } = event;
Iif (
!(
(event instanceof MouseEvent || event instanceof KeyboardEvent) &&
target instanceof HTMLElement &&
target.parentElement?.matches(checkboxCellSelector)
)
) {
// Not the target labels or checkboxes, bail
return;
}
if (event.shiftKey) {
// Remove the default text selection that might happen
window.getSelection()?.removeAllRanges();
}
Iif (!(target instanceof HTMLInputElement)) {
// If it's not the checkbox, it's the label, bail, another event will come
return;
}
if (event.shiftKey) {
const checkboxes = Array.from(
checkboxContainer.querySelectorAll<HTMLInputElement>(
`${checkboxCellSelector} > input[type="checkbox"]`
) || []
);
let firstIndex = Math.max(
0,
lastTickedRef.current ? checkboxes.indexOf(lastTickedRef.current) : 0
);
let lastIndex = checkboxes.indexOf(target);
Iif (lastIndex < firstIndex) {
// Switch order if the last is before the first
[firstIndex, lastIndex] = [lastIndex, firstIndex + 1];
}
// not immediately, fires native events that are handled synchronously
schedule().then(() => {
// loop on all the checkboxes within the range
for (const checkbox of checkboxes.slice(firstIndex, lastIndex)) {
Eif (
// if the target is checked, check all the others
(target.checked && !checkbox.checked) ||
// if the target is unchecked, uncheck all the others
(!target.checked && checkbox.checked)
) {
// Artificially click them all to trigger click events
checkbox.click();
}
}
});
}
// No way to test that as we can't generate trusted events in tests
/* istanbul ignore next */
if (event.isTrusted) {
// user-generated event, keep track of target as last toggled checkbox
lastTickedRef.current = target;
}
// Toggle select all accordingly
updateSelectAllCheckbox(checkboxContainer, privateSelectAllRef.current);
// Call user event handler with the native event
onSelectionChange(event);
};
checkboxContainer?.addEventListener('click', listener);
// eslint-disable-next-line consistent-return
return () => {
checkboxContainer?.removeEventListener('click', listener);
};
}, [checkboxContainer, onSelectionChange]);
const checkSelectAllSync = useCallback(() => {
updateSelectAllCheckbox(
privateCheckboxContainerRef.current,
privateSelectAllRef.current
);
}, []);
return {
selectAllRef,
checkboxContainerRef,
checkSelectAllSync,
};
};
export default useDataCheckboxes;
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