usePointerSensor

A Solid hook that creates a PointerSensor instance for handling pointer, touch, and mouse events.

Usage

/** @jsxImportSource solid-js */
import { useDraggable, usePointerSensor } from 'dragdoll-solid';

function DraggableItem() {
  let element: HTMLDivElement | null = null;
  const [pointerSensor, setPointerSensorRef] = usePointerSensor();
  const draggable = useDraggable([pointerSensor], () => ({
    elements: () => (element ? [element] : []),
  }));

  return (
    <div
      ref={(node) => {
        element = node;
        setPointerSensorRef(node);
      }}
      style={{ position: 'relative' }}
    >
      Drag me
    </div>
  );
}

Signature

function usePointerSensor<E extends PointerSensorEvents = PointerSensorEvents>(
  settings?: MaybeAccessor<Partial<PointerSensorSettings> | undefined>,
  element?: MaybeAccessor<Element | Window | null>,
): readonly [Accessor<PointerSensor<E> | null>, (node: Element | null) => void];

Parameters

settings

type settings = MaybeAccessor<Partial<PointerSensorSettings> | undefined>;

Configuration settings for the pointer sensor. See core PointerSensor settings for all available settings. You can pass a plain object or an accessor function that returns one.

Since Solid components run their setup code only once, there is no need to memoize settings. If you need reactive settings, pass an accessor function (e.g. () => ({ ...mySignalSettings() })).

To listen for sensor events (start, move, cancel, end, destroy), use the useSensorCallback hook:

const [pointerSensor, setPointerSensorRef] = usePointerSensor();

useSensorCallback(pointerSensor, 'start', (e) => {
  console.log('Sensor started at', e.x, e.y);
});
useSensorCallback(pointerSensor, 'move', (e) => {
  console.log('Sensor moved to', e.x, e.y);
});
useSensorCallback(pointerSensor, 'cancel', (e) => {
  console.log('Sensor cancelled at', e.x, e.y);
});
useSensorCallback(pointerSensor, 'end', (e) => {
  console.log('Sensor ended at', e.x, e.y);
});
useSensorCallback(pointerSensor, 'destroy', () => {
  console.log('Sensor destroyed');
});

IMPORTANT

Callbacks do not need special handling. The hook stores a reference to the latest callback internally.

• Optional.
• Default: {}.

element

type element = MaybeAccessor<Element | Window | null>;

The element to attach the sensor to. If you want to attach the sensor to an element that is not managed by Solid, you can provide the element (or an accessor returning it) as the second parameter to the hook. In other cases it's recommended to always use the ref callback which is returned from the hook as the second value in the array.

• Optional.
• Default: undefined.

Return Value

type returnValue = readonly [Accessor<PointerSensor<E> | null>, (node: Element | null) => void];

Returns a read-only array with two elements:

1. pointerSensor

   • An accessor that resolves to the PointerSensor instance, or null if not yet initialized. Access the value by calling it: pointerSensor().

2. setPointerSensorRef

   • A ref callback to attach the sensor to an element. This is the recommended way to attach the sensor to an element. You can alternatively provide an explicit element as the second parameter to the hook.

Notes

• The sensor instance is automatically destroyed when the component unmounts (via onCleanup).
• Settings can be updated dynamically via an accessor and will be applied to the sensor.
• If the element changes, the sensor is recreated with the new element.
• The sensor will be null initially until an element is attached.

Types

MaybeAccessor

// Import
import type { MaybeAccessor } from 'dragdoll-solid';

// Type
type MaybeAccessor<T> = T | Accessor<T>;

MaybeAccessor<T> accepts either the literal value or a Solid accessor returning T. This allows you to pass a plain object for static settings or an accessor function for reactive settings.