ngx-drag-to-select/esm2020/lib/operators.mjs

A lightweight, fast, configurable and reactive drag-to-select component for Angular 8 and beyond

import { distinctUntilChanged, filter, map, withLatestFrom } from 'rxjs/operators';
import { getRelativeMousePosition, hasMinimumSize } from './utils';
export const createSelectBox = (container) => {
    return (source) => {
        return source.pipe(map(([event, opacity, { x, y }]) => {
            // Type annotation is required here, because `getRelativeMousePosition` returns a `MousePosition`,
            // the TS compiler cannot figure out the shape of this type.
            const mousePosition = getRelativeMousePosition(event, container);
            const width = opacity > 0 ? mousePosition.x - x : 0;
            const height = opacity > 0 ? mousePosition.y - y : 0;
            return {
                top: height < 0 ? mousePosition.y : y,
                left: width < 0 ? mousePosition.x : x,
                width: Math.abs(width),
                height: Math.abs(height),
                opacity,
            };
        }));
    };
};
export const whenSelectBoxVisible = (selectBox$) => (source) => source.pipe(withLatestFrom(selectBox$), filter(([, selectBox]) => hasMinimumSize(selectBox, 0, 0)), map(([event, _]) => event));
export const distinctKeyEvents = () => (source) => source.pipe(distinctUntilChanged((prev, curr) => {
    return prev && curr && prev.code === curr.code;
}));
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