redash/client/app/components/Resizable/index.jsx

import d3 from "d3";
import React, { useRef, useMemo, useCallback, useState, useEffect } from "react";
import PropTypes from "prop-types";
import { Resizable as ReactResizable } from "react-resizable";
import KeyboardShortcuts from "@/services/KeyboardShortcuts";

import "./index.less";

export default function Resizable({ toggleShortcut, direction, sizeAttribute, children }) {
  const [size, setSize] = useState(0);
  const elementRef = useRef();
  const wasUsingTouchEventsRef = useRef(false);
  const wasResizedRef = useRef(false);

  const sizeProp = direction === "horizontal" ? "width" : "height";
  sizeAttribute = sizeAttribute || sizeProp;

  const getElementSize = useCallback(() => {
    if (!elementRef.current) {
      return 0;
    }
    return Math.floor(elementRef.current.getBoundingClientRect()[sizeProp]);
  }, [sizeProp]);

  const savedSize = useRef(null);
  const toggle = useCallback(() => {
    if (!elementRef.current) {
      return;
    }

    const element = d3.select(elementRef.current);
    let targetSize;
    if (savedSize.current === null) {
      targetSize = "0px";
      savedSize.current = `${getElementSize()}px`;
    } else {
      targetSize = savedSize.current;
      savedSize.current = null;
    }

    element
      .style(sizeAttribute, savedSize.current || "0px")
      .transition()
      .duration(200)
      .ease("swing")
      .style(sizeAttribute, targetSize);

    // update state to new element's size
    setSize(parseInt(targetSize) || 0);
  }, [getElementSize, sizeAttribute]);

  const resizeHandle = useMemo(
    () => (
      // eslint-disable-next-line jsx-a11y/click-events-have-key-events, jsx-a11y/no-noninteractive-element-interactions
      <span
        className={`react-resizable-handle react-resizable-handle-${direction}`}
        role="separator"
        onClick={() => {
          // TODO: add key controls
          // On desktops resize uses `mousedown`/`mousemove`/`mouseup` events, and there is a conflict
          // with this `click` handler: after user releases mouse - this handler will be executed.
          // So we use `wasResized` flag to check if there was actual resize or user just pressed and released
          // left mouse button (see also resize event handlers where ths flag is set).
          // On mobile devices `touchstart`/`touchend` events wll be used, so it's safe to just execute this handler.
          // To detect which set of events was actually used during particular resize operation, we pass
          // `onMouseDown` handler to draggable core and check event type there (see also that handler's code).
          if (wasUsingTouchEventsRef.current || !wasResizedRef.current) {
            toggle();
          }
          wasUsingTouchEventsRef.current = false;
          wasResizedRef.current = false;
        }}
      />
    ),
    [direction, toggle]
  );

  useEffect(() => {
    if (toggleShortcut) {
      const shortcuts = {
        [toggleShortcut]: toggle,
      };

      KeyboardShortcuts.bind(shortcuts);
      return () => {
        KeyboardShortcuts.unbind(shortcuts);
      };
    }
  }, [toggleShortcut, toggle]);

  const resizeEventHandlers = useMemo(
    () => ({
      onResizeStart: () => {
        // use element's size as initial value (it will also check constraints set in CSS)
        // updated here and in `draggableCore::onMouseDown` handler to ensure that right value will be used
        setSize(getElementSize());
      },
      onResize: (unused, data) => {
        // update element directly for better UI responsiveness
        d3.select(elementRef.current).style(sizeAttribute, `${data.size[sizeProp]}px`);
        setSize(data.size[sizeProp]);
        wasResizedRef.current = true;
      },
      onResizeStop: () => {
        if (wasResizedRef.current) {
          savedSize.current = null;
        }
      },
    }),
    [sizeProp, getElementSize, sizeAttribute]
  );

  const draggableCoreOptions = useMemo(
    () => ({
      onMouseDown: e => {
        // In some cases this handler is executed twice during the same resize operation - first time
        // with `touchstart` event and second time with `mousedown` (probably emulated by browser).
        // Therefore we set the flag only when we receive `touchstart` because in ths case it's definitely
        // mobile browser (desktop browsers will also send `mousedown` but never `touchstart`).
        if (e.type === "touchstart") {
          wasUsingTouchEventsRef.current = true;
        }

        // use element's size as initial value (it will also check constraints set in CSS)
        // updated here and in `onResizeStart` handler to ensure that right value will be used
        setSize(getElementSize());
      },
    }),
    [getElementSize]
  );

  if (!children) {
    return null;
  }

  children = React.createElement(children.type, { ...children.props, ref: elementRef });

  return (
    <ReactResizable
      className="resizable-component"
      axis={direction === "horizontal" ? "x" : "y"}
      resizeHandles={[direction === "horizontal" ? "e" : "s"]}
      handle={resizeHandle}
      width={direction === "horizontal" ? size : 0}
      height={direction === "vertical" ? size : 0}
      minConstraints={[0, 0]}
      {...resizeEventHandlers}
      draggableOpts={draggableCoreOptions}>
      {children}
    </ReactResizable>
  );
}

Resizable.propTypes = {
  direction: PropTypes.oneOf(["horizontal", "vertical"]),
  sizeAttribute: PropTypes.string,
  toggleShortcut: PropTypes.string,
  children: PropTypes.element,
};

Resizable.defaultProps = {
  direction: "horizontal",
  sizeAttribute: null, // "width"/"height" - depending on `direction`
  toggleShortcut: null,
  children: null,
};