File size: 2,215 Bytes
aa2e6af | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | import { useCallback, useMemo } from 'react';
import type { SetterOrUpdater } from 'recoil';
/** Event Keys that shouldn't trigger a command */
const invalidKeys = {
Escape: true,
Backspace: true,
Enter: true,
};
/**
* Utility function to determine if a command should trigger.
*/
const shouldTriggerCommand = (
textAreaRef: React.RefObject<HTMLTextAreaElement>,
commandChar: string,
) => {
const text = textAreaRef.current?.value;
if (!(text && text[text.length - 1] === commandChar)) {
return false;
}
const startPos = textAreaRef.current?.selectionStart;
if (!startPos) {
return false;
}
const isAtStart = startPos === 1;
const isPrecededBySpace = textAreaRef.current?.value.charAt(startPos - 2) === ' ';
const shouldTrigger = isAtStart || isPrecededBySpace;
return shouldTrigger;
};
/**
* Custom hook for handling key up events with command triggers.
*/
const useHandleKeyUp = ({
textAreaRef,
setShowPlusPopover,
setShowMentionPopover,
}: {
textAreaRef: React.RefObject<HTMLTextAreaElement>;
setShowPlusPopover: SetterOrUpdater<boolean>;
setShowMentionPopover: SetterOrUpdater<boolean>;
}) => {
const handleAtCommand = useCallback(() => {
if (shouldTriggerCommand(textAreaRef, '@')) {
setShowMentionPopover(true);
}
}, [textAreaRef, setShowMentionPopover]);
const handlePlusCommand = useCallback(() => {
if (shouldTriggerCommand(textAreaRef, '+')) {
setShowPlusPopover(true);
}
}, [textAreaRef, setShowPlusPopover]);
const commandHandlers = useMemo(
() => ({
'@': handleAtCommand,
'+': handlePlusCommand,
}),
[handleAtCommand, handlePlusCommand],
);
/**
* Main key up handler.
*/
const handleKeyUp = useCallback(
(event: React.KeyboardEvent<HTMLTextAreaElement>) => {
const text = textAreaRef.current?.value;
if (!text) {
return;
}
if (invalidKeys[event.key]) {
return;
}
const lastChar = text[text.length - 1];
const handler = commandHandlers[lastChar];
if (handler) {
handler();
}
},
[textAreaRef, commandHandlers],
);
return handleKeyUp;
};
export default useHandleKeyUp;
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