@grafana/ui/dist/esm/components/Combobox/useComboboxFloat.mjs

Grafana Components Library

import { autoPlacement, size, useFloating, autoUpdate } from '@floating-ui/react';
import { useRef, useState, useMemo } from 'react';
import { t } from '@grafana/i18n';
import { BOUNDARY_ELEMENT_ID } from '../../utils/floating.mjs';
import { measureText } from '../../utils/measureText.mjs';
import { NO_OPTIONS_I18N_KEY } from './MessageRows.mjs';
import { MENU_OPTION_HEIGHT, POPOVER_MAX_HEIGHT, MENU_ITEM_FONT_SIZE, MENU_ITEM_FONT_WEIGHT, MENU_ITEM_DESCRIPTION_FONT_SIZE, MENU_ITEM_PADDING } from './getComboboxStyles.mjs';

"use strict";
const WIDTH_CALCULATION_LIMIT_ITEMS = 1e5;
const POPOVER_PADDING = 16;
const SCROLL_CONTAINER_PADDING = 8;
const ICON_WIDTH = 28;
const MESSAGE_ROW_PADDING = 32;
const useComboboxFloat = (items, isOpen) => {
  var _a, _b;
  const inputRef = useRef(null);
  const floatingRef = useRef(null);
  const scrollRef = useRef(null);
  const [popoverMaxSize, setPopoverMaxSize] = useState({
    width: 0,
    height: 0
  });
  const scrollbarWidth = useMemo(() => getScrollbarWidth(), []);
  const middleware = [
    autoPlacement({
      // see https://floating-ui.com/docs/autoplacement
      allowedPlacements: ["bottom-start", "bottom-end", "top-start", "top-end"],
      boundary: (_a = document.getElementById(BOUNDARY_ELEMENT_ID)) != null ? _a : void 0,
      crossAxis: true
    }),
    size({
      apply({ availableWidth, availableHeight }) {
        const preferredMaxWidth = availableWidth - POPOVER_PADDING;
        const preferredMaxHeight = availableHeight - POPOVER_PADDING;
        const width = Math.max(preferredMaxWidth, 0);
        const height = Math.min(Math.max(preferredMaxHeight, MENU_OPTION_HEIGHT * 6), POPOVER_MAX_HEIGHT);
        setPopoverMaxSize({ width, height });
      }
    })
  ];
  const elements = { reference: inputRef.current, floating: floatingRef.current };
  const { floatingStyles } = useFloating({
    strategy: "fixed",
    open: isOpen,
    placement: "bottom-start",
    middleware,
    elements,
    whileElementsMounted: autoUpdate
  });
  const longestItemWidth = useMemo(() => {
    var _a2, _b2;
    let longestLabel = "";
    let longestLabelIndex = -1;
    let longestDescription = "";
    const itemsToLookAt = Math.min(items.length, WIDTH_CALCULATION_LIMIT_ITEMS);
    for (let i = 0; i < itemsToLookAt; i++) {
      const itemLabel = (_a2 = items[i].label) != null ? _a2 : items[i].value.toString();
      if (itemLabel.length > longestLabel.length) {
        longestLabel = itemLabel;
        longestLabelIndex = i;
      }
      const itemDescription = (_b2 = items[i].description) != null ? _b2 : "";
      if (itemDescription.length > longestDescription.length) {
        longestDescription = itemDescription;
      }
    }
    const labelWidth = measureText(longestLabel, MENU_ITEM_FONT_SIZE, MENU_ITEM_FONT_WEIGHT).width;
    const descriptionWidth = longestDescription ? measureText(longestDescription, MENU_ITEM_DESCRIPTION_FONT_SIZE).width : 0;
    const iconSize = longestLabelIndex > -1 && items[longestLabelIndex].icon ? ICON_WIDTH : 0;
    const textWidth = Math.max(labelWidth + iconSize, descriptionWidth);
    const itemWidth = textWidth + SCROLL_CONTAINER_PADDING + MENU_ITEM_PADDING * 2 + scrollbarWidth;
    const noOptionsText = t(NO_OPTIONS_I18N_KEY, "No options found.");
    const noOptionsWidth = measureText(noOptionsText, MENU_ITEM_FONT_SIZE).width + MESSAGE_ROW_PADDING + scrollbarWidth;
    return Math.max(itemWidth, noOptionsWidth);
  }, [items, scrollbarWidth]);
  const floatStyles = {
    ...floatingStyles,
    width: longestItemWidth,
    maxWidth: popoverMaxSize.width,
    minWidth: (_b = inputRef.current) == null ? void 0 : _b.offsetWidth,
    maxHeight: popoverMaxSize.height
  };
  return { inputRef, floatingRef, scrollRef, floatStyles };
};
function getScrollbarWidth() {
  var _a;
  const outer = document.createElement("div");
  outer.style.visibility = "hidden";
  outer.style.overflow = "scroll";
  document.body.appendChild(outer);
  const inner = document.createElement("div");
  outer.appendChild(inner);
  const scrollbarWidth = outer.offsetWidth - inner.offsetWidth;
  (_a = outer.parentNode) == null ? void 0 : _a.removeChild(outer);
  return scrollbarWidth;
}

export { useComboboxFloat };
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