@react-md/menu/es/useVisibility.js

Create menus that auto-position themselves within the viewport and adhere to the accessibility guidelines

import { useCallback, useRef, useState } from "react";
/**
 * This is the main visibility hook to be used for the `DropdownMenu` and
 * `DropdownMenuItem` components. It'll provide the current visibility as well
 * as the default focus type once the menu becomes visible.
 *
 * @private
 */
export function useVisibility(_a) {
    var _b = _a === void 0 ? {} : _a, _c = _b.defaultVisible, defaultVisible = _c === void 0 ? false : _c, _d = _b.defaultFocus, defaultFocusValue = _d === void 0 ? "first" : _d, onVisibilityChange = _b.onVisibilityChange;
    var _e = useState({
        visible: defaultVisible,
        defaultFocus: defaultFocusValue,
    }), _f = _e[0], visible = _f.visible, defaultFocus = _f.defaultFocus, setState = _e[1];
    var prevVisible = useRef(visible);
    if (prevVisible.current !== visible) {
        prevVisible.current = visible;
        if (onVisibilityChange) {
            onVisibilityChange(visible);
        }
    }
    /**
     * A callback to use that allows you to provide a string for if the focus
     * target should be the "first" or "last" focusable element in the menu.  This
     * should be "first" for all cases except when the control opens the menu with
     * an arrow up key event.
     */
    var showWithFocus = useCallback(function (defaultFocus) {
        setState({ visible: true, defaultFocus: defaultFocus });
    }, []);
    /**
     * The default implementation of showing the menu that will focus the first
     * menu item once visible.
     */
    var show = useCallback(function () {
        showWithFocus("first");
    }, [showWithFocus]);
    /**
     * Hides the menu.
     */
    var hide = useCallback(function () {
        setState({ visible: false, defaultFocus: "first" });
    }, []);
    /**
     * Toggles the visibility of the menu.
     */
    var toggle = useCallback(function () {
        setState(function (_a) {
            var visible = _a.visible, defaultFocus = _a.defaultFocus;
            return ({
                visible: !visible,
                defaultFocus: defaultFocus,
            });
        });
    }, []);
    return {
        visible: visible,
        defaultFocus: defaultFocus,
        show: show,
        showWithFocus: showWithFocus,
        hide: hide,
        toggle: toggle,
    };
}
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