standardnotes-app-web/app/assets/javascripts/preferences/panes/extensions-segments/RenameExtension.tsx

import { FunctionComponent } from "preact";
import { useState, useRef, useEffect } from "preact/hooks";

export const RenameExtension: FunctionComponent<{
  extensionName: string, changeName: (newName: string) => void
}> = ({ extensionName, changeName }) => {
  const [isRenaming, setIsRenaming] = useState(false);
  const [newExtensionName, setNewExtensionName] = useState<string>(extensionName);

  const inputRef = useRef<HTMLInputElement>(null);

  useEffect(() => {
    if (isRenaming) {
      inputRef.current!.focus();
    }
  }, [inputRef, isRenaming]);

  const startRenaming = () => {
    setNewExtensionName(extensionName);
    setIsRenaming(true);
  };

  const cancelRename = () => {
    setNewExtensionName(extensionName);
    setIsRenaming(false);
  };

  const confirmRename = () => {
    if (!newExtensionName) {
      return;
    }
    changeName(newExtensionName);
    setIsRenaming(false);
  };

  return (
    <div className="flex flex-row mr-3 items-center">
      <input
        ref={inputRef}
        disabled={!isRenaming}
        autocomplete='off'
        className="flex-grow text-base font-bold no-border bg-default px-0 color-text"
        type="text"
        value={newExtensionName}
        onChange={({ target: input }) => setNewExtensionName((input as HTMLInputElement)?.value)}
      />
      <div className="min-w-3" />
      {isRenaming ?
        <>
          <a className="pt-1 cursor-pointer" onClick={confirmRename}>Confirm</a>
          <div className="min-w-3" />
          <a className="pt-1 cursor-pointer" onClick={cancelRename}>Cancel</a>
        </> :
        <a className="pt-1 cursor-pointer" onClick={startRenaming}>Rename</a>
      }
    </div>
  );
};