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.
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.
- Here is an example, pls check this PR (https://github.com/brimdata/react-arborist/pull/104/files#diff-3c486835e7c2f717f2f48884fc39d480aaa737c719278ed09aecb04d4724fcb1R48)
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 };
MIT License.