# All files useExpansionPanels.ts

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95.83% Branches 23/24
100% Functions 4/4
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     import { useState } from "react";
    import type { UseStateInitializer, UseStateSetter } from "../types";
    import { useEnsuredId } from "../useEnsuredId";
    import type { ExpansionPanelProps } from "./ExpansionPanel";

    /** @remarks \@since 6.0.0 */
    export interface ExpansionPanelHookOptions {
      /**
       * An optional id to prefix each panel with.
       *
       * @defaultValue `"expansion-panel-" + useId()`
       */
      baseId?: string;

      /**
       * Set this to `true` if multiple panels can be open at the same time.
       *
       * @defaultValue `false`
       */
      multiple?: boolean;

      /**
       * Set this to `true` to enforce that at least one panel must always be
       * expanded.
       *
       * @defaultValue `false`
       */
      preventAllClosed?: boolean;

      /**
       * This is a convenience option to disable the expansion transition for all
       * panels.
       *
       * @defaultValue `false`
       */
      disableTransition?: boolean;

      /**
       * @defaultValue `preventAllClosed ? ["expansion-panel-" + useId() + "-1"] : []`
       */
      defaultExpandedIds?: UseStateInitializer<string[]>;

      /**
       * This can only be used if the {@link defaultExpandedIds} was not provided
       * and using index based panels.
       *
       * @example
       * ```tsx
       * const { getPanelProps } = useExpansionPanels({
       *   defaultExpandedIndex: 2,
       * });
       *
       * return (
       *   <ExpansionPanel {...getPanelProps(0)} />
       *   <ExpansionPanel {...getPanelProps(1)} />
       *   // expanded on first render
       *   <ExpansionPanel {...getPanelProps(2)} />
       *   <ExpansionPanel {...getPanelProps(3)} />
       * );
       * ```
       */
      defaultExpandedIndex?: number;

      /**
       * @defaultValue `false`
       */
      disableContentPadding?: boolean;
    }

    /** @remarks \@since 6.0.0 */
    export type ProvidedExpansionPanelProps = Pick<
      Required<ExpansionPanelProps>,
      | "id"
      | "disabled"
      | "expanded"
      | "onExpandClick"
      | "disableTransition"
      | "disableContentPadding"
    >;

    /**
     * @param indexOrPanelId - This should either be a DOM id to use for the panel
     * or the panel's index.
     * @returns Props to pass to an `ExpansionPanel` for it to work correctly.
     * @remarks \@since 6.0.0
     */
    export type GetExpansionPanelProps = (
      indexOrPanelId: string | number
    ) => ProvidedExpansionPanelProps;

    /** @remarks \@since 6.0.0 */
    export interface ExpansionPanelImplementation {
      /**
       * The current set of expanded panel ids if you need this for some reason.
       */
      expandedIds: ReadonlySet<string>;

      /**
       * This can be used to manually control which panels are expanded if the
       * default behavior does not work for your use case.
       */
      setExpandedIds: UseStateSetter<ReadonlySet<string>>;

      /**
       * @example
       * Index Based Panels
       * ```tsx
       * <ExpansionPanel {...getPanelProps(0)} />
       * <ExpansionPanel {...getPanelProps(1)} />
       * <ExpansionPanel {...getPanelProps(2)} />
       * ```
       *
       * @example
       * Custom Panel Ids
       * ```tsx
       * <ExpansionPanel {...getPanelProps("address-panel")} />
       * <ExpansionPanel {...getPanelProps("billing-panel")} />
       * <ExpansionPanel {...getPanelProps("confirmation-panel")} />
       * ```
       */
      getPanelProps: GetExpansionPanelProps;
    }

    /**
     * Use this hook to control the expanded state for a group of `ExpansionPanel`.
     *
     * @example
     * Index Based Panels
     * ```tsx
     * import {
     *   ExpansionList,
     *   ExpansionPanel,
     *   useExpansionPanels,
     * } from "@react-md/core";
     * import { type ReactElement } from "react";
     *
     * function Example(): ReactElement {
     *   const { getPanelProps } = useExpansionPanels();
     *
     *   return (
     *     <ExpansionList>
     *       <ExpansionPanel {...getPanelProps(0)} headerChildren="Panel 1">
     *         Panel 1 Contents
     *       </ExpansionPanel>
     *       <ExpansionPanel {...getPanelProps(1)} headerChildren="Panel 2">
     *         Panel 2 Contents
     *       </ExpansionPanel>
     *       <ExpansionPanel {...getPanelProps(2)} headerChildren="Panel 3">
     *         Panel 3 Contents
     *       </ExpansionPanel>
     *     </ExpansionList>
     *   );
     * }
     * ```
     *
     * @example
     * Custom Panel Ids and Expand All Panels by Default
     * ```tsx
     * import {
     *   ExpansionList,
     *   ExpansionPanel,
     *   useExpansionPanels,
     * } from "@react-md/core";
     * import { type ReactElement } from "react";
     *
     * import { BillingAddress } from "./BillingAddress";
     * import { BillingInformation } from "./BillingInformation";
     * import { PersonalInformation } from "./PersonalInformation";
     *
     * const panel1Id = "personal-information-panel";
     * const panel2Id = "billing-information-panel";
     * const panel3Id = "billing-address-panel";
     *
     * function Example(): ReactElement {
     *   const { getPanelProps } = useExpansionPanels({
     *     multiple: true,
     *     defaultExpandedIds: () => [panel1Id, panel2Id, panel3Id],
     *   });
     *
     *   return (
     *     <ExpansionList>
     *       <ExpansionPanel {...getPanelProps(panel1Id)} headerChildren="Personal Information">
     *         <PersonalInformation />
     *       </ExpansionPanel>
     *       <ExpansionPanel {...getPanelProps(panel2Id)} headerChildren="Billing Information">
     *         <BillingInformation />
     *       </ExpansionPanel>
     *       <ExpansionPanel {...getPanelProps(panel3Id)} headerChildren="Billing Address">
     *         <BillingAddress />
     *       </ExpansionPanel>
     *     </ExpansionList>
     *   );
     * }
     * ```
     *
     *
     * @remarks
     * \@since 6.0.0 The hook was renamed from `usePanels` to `useExpansionPanels`,
     * the API changed to return `getPanelProps` instead of a generated list of
     * panel props based on the provided `count`, and the hook no longer supports
     * having all panels expanded by default.
     */
    export function useExpansionPanels(
      options: ExpansionPanelHookOptions = {}
    ): ExpansionPanelImplementation {
      const {
        baseId: propBaseId,
        multiple = false,
        preventAllClosed = false,
        disableTransition = false,
        defaultExpandedIds,
        defaultExpandedIndex,
        disableContentPadding = false,
      } = options;

      const baseId = useEnsuredId(propBaseId, "expansion-panel");
      const createId = (index: number): string => `${baseId}-${index + 1}`;
      const [expandedIds, setExpandedIds] = useState<ReadonlySet<string>>(() => {
        if (typeof defaultExpandedIds === "undefined") {
          const initialList: string[] = [];
          if (typeof defaultExpandedIndex === "number" || preventAllClosed) {
            initialList.push(createId(defaultExpandedIndex ?? 0));
          }

          return new Set(initialList);
        }

        const ids =
          typeof defaultExpandedIds === "function"
            ? defaultExpandedIds()
            : defaultExpandedIds;
        return new Set(ids);
      });

      return {
        expandedIds,
        setExpandedIds,
        getPanelProps(indexOrPanelId) {
          const id =
            typeof indexOrPanelId === "string"
              ? indexOrPanelId
              : createId(indexOrPanelId);

          const expanded = expandedIds.has(id);
          const disabled = expanded && preventAllClosed && expandedIds.size === 1;
          return {
            id,
            disabled,
            expanded,
            onExpandClick() {
              if (disabled) {
                return;
              }

              setExpandedIds((prevIds) => {
                const expanded = prevIds.has(id);
                if (!multiple) {
                  return new Set(expanded ? [] : [id]);
                }

                const nextIds = new Set(prevIds);
                if (expanded) {
                  nextIds.delete(id);
                } else {
                  nextIds.add(id);
                }

                return nextIds;
              });
            },
            disableTransition,
            disableContentPadding,
          };
        },
      };
    }