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README.md

use-shortcuts

Effortlessly create keyboard shortcuts with this react hook.

use-shortcuts is really a thin wrapper around mousetrap.

use-shortcuts is written in typescript so you can take advantage of better typesafety

install

# npm
npm install @cutting/use-shortcuts -S

# yarn
yarn add @cutting/use-shortcuts -S

Usage

import { useShortcuts } from '@cutting/use-shortcuts';

const MyCmponent: React.FC = () => {
  useShortcuts({
    shortcutMap: {
      MOVE_LEFT: 'a',
    },
    handler: (action, e) => {
      switch (action.type) {
        case 'MOVE_LEFT':
          console.log('move left');
          break;
        // etc.
      }
    }
  });

  return <div>component</dv>
};

In the above example, the useShortcuts hook is called and a configurtion object of type UseShortcuts is supplied as an argument:

export interface UseShortcuts {
  shortcutMap: ShortcutMap;
  handler: ShortcutHandler;
  ref?: React.RefObject<HTMLElement>;
}

The configuration object has a required property shortcutMap which is a key value pair of actions that are dispatched when keyboard events are triggered.

In this example, if the a key is pressed, the useShortcuts hook will dispatch an action object of { type: 'MOVE_LEFT' } to the handler function that is also a required field of the configuration object.

The handler attribute takes a function that expects an Action object:

(action: { type: string } => void)

Keys and Key sequences

You can pass simple strings, an array of strings or a combination element that requires more than one key to activate or a sequence of keys that relies on each key in the sequence being executed before the handler fires.

There is a KeyCode enum to help with the special keys.

  import { ShortcutMap } from '@cutting/use-shortcuts';

  export const shortcutMap: ShortcutMap = {
    // 'x' dispatches { type: 'SIMPLE_STRING' }
    SIMPLE_STRING: 'x',
    // left arrow or 'a' dispatch {type: 'MOVE_LEFT' }
    MOVE_LEFT: [KeyCode.LeftArrow, 'a'],
    // right arrow or 'd' dispatch {type: 'MOVE_RIGHT' }
    MOVE_RIGHT: [KeyCode.RightArrow, 'd'], either
    // ctrl + f dispatches { type: 'COMBINATION_EXAMPLE' }
    COMBINATION_EXAMPLE: { combination: [KeyCode.Ctrl, 'f'] },
    // x followed by c dispatches { type: 'SEQUENCE_EXAMPLE' }
    SEQUENCE_EXAMPLE: { sequence: ['x', 'c'] },
};

const MyCmponent: React.FC = () => {
  const handleMove = useCallback(
    (action: keyof typeof shortcutMap) => {
      switch (action) {
        case 'MOVE_LEFT':
          console.log('move left');
          break;
        case 'MOVE_RIGHT':
          console.log('move right');
          break;
        // etc.
      }
    },
    [// any deps]
  );

  useShortcuts({
    shortcutMap,
    handler
  });

  return <div>component</dv>

configuration

useShortcuts takes a configuration object of type UseShortcuts:

export interface UseShortcuts {
  shortcutMap: ShortcutMap;
  handler: ShortcutHandler;
  ref?: React.RefObject<HTMLElement>;
}
field description
shortcutMap A key value pair object where the keys are the actions tht get dispatched and the values are the keys that invoke the actions.
handler The function that useShortcuts will call with the action keys from the shortcutMap
ref an optional React.RefObject<HTMLElement> that will have add the keyboard event listeners bound to. If ref is omitted then the event listeners will be added to the document object.

adding event listeners to an html element

By default event listeners are added to the document object unless the ref attribute is supplied in the configuration, in which case the event handlers are added to that element when it is in the DOM:

export const Comp: React.FC = () => {
  const ref = useRef<HTMLInputElement>(null);
  const [text, setText] = useState('');

  useShortcuts({
    shortcutMap: {
      AAA: 'a',
    },
    handler: (action: Action) => {
      console.log(action);
    },
    ref,
  });


  return (
    <input
      type="text"
      ref={ref}
      value={text}
      onChange={e => setText(e.target.value)}
    />
  )
}

build

npm run build

run tests

npm test
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