auto-scroll-while-dragging

This package is used to enhance the auto-scrolling behavior while dragging.

Why? Because the browser native auto-scrolling behavior is uncontrollable or even not working, especially on safari browser.

Talk is meaningless, please check the demo by using different browsers.

Get Started

npm i auto-scroll-while-dragging
yarn add auto-scroll-while-dragging
pnpm add auto-scroll-while-dragging

• For normal use, just run the function with your options

import { autoScrollWhileDragging } from 'auto-scroll-while-dragging';

autoScrollWhileDragging({
  rootEl: document.body,
  gap: 150,
});

• For react SSR use, put it inside useEffect and don't forget to clear effects

import { autoScrollWhileDragging } from 'auto-scroll-while-dragging';

function MyComponent() {
  useEffect(() => {
    let unbind = autoScrollWhileDragging({ rootEl: document.body, gap: 150 });
    return () => unbind();
  }, []);

  return <></>;
}

• For some specific cases, eg: using with react-dnd and virtual list. You may need manually bind the drag behavior with the exported handlers (eg: autoScrollWhileDragging.dragHandler).
  • Why? Because in virtual list, the target which emit drag event might be removed from DOM tree during scrolling.

Docs

interface AutoScrollWhileDragging {
  (options?: {
    /** The root element which will listen the drag event. Default is `document.body`. */
    rootEl?: HTMLElement;
    /** The scroll speed, default is 0.3 */
    speed?: number;
    /** The max gap between mouse pointer and the bound of scroll element. Default is `100`, unit is `px`. */
    gap?: number;
    /** Define delay of throttle dragging. Default is `20`, unit is `ms`. */
    throttleDelay?: number;
  }): () => void;
  dragStartHandler: (e: DragEvent) => void;
  dragHandler: (e: DragEvent) => void;
  dragEndHandler: () => void;
}
/**
 * Enhance the auto-scrolling behavior while dragging.
 * It returns a function which will clear effects.
 */
declare const autoScrollWhileDragging: AutoScrollWhileDragging;

export { autoScrollWhileDragging };

Design And Implement

License

MIT License.