Context

You can supply custom context to the bind function like bind(context) and then access it from callbacks (onStart, callback, onFinish, onCancel, onMove) second argument e.g.: onStart: (event, { context }) => ...

Context changes during component lifecycle

All callbacks but long press callback will use latest provided context. callback will receive context as it was when long press started.

To better understand how component updates affect context let's analyze example below

1. Initial render

import { useLongPress } from "./use-long-press";

const MyComponent: FC = () => {
  const bind = useLongPress();

  return <div {...bind('context 1')}/>;
}

1. Div is clicked, triggering onStart with 'context 1'

2. Context changed to 'context 2'

// ...
<div {...bind('context 2')}/>
// ...

1. threshold time elapses triggering callback with 'context 1' as it was when long press started

2. Click finish triggering onFinish with 'context 2' since it changed

Context value when long press finish outside element

When cancelOutsideElement option is set to false long press finish will be detected on window therefore it won't be possible to determine which context was used.

Let's say we use ...bind('test'), therefore onStart and callback will receive context 'test' but onCancel or onFinish if triggered outside element will receive context undefined