office-ui-fabric-react/lib-commonjs/utilities/hooks/useResponsiveMode.js

Reusable React components for building experiences for Microsoft 365.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var React = require("react");
var utilities_1 = require("@uifabric/utilities");
var react_hooks_1 = require("@uifabric/react-hooks");
var withResponsiveMode_1 = require("../decorators/withResponsiveMode");
/**
 * Hook to get the current responsive mode (window size category).
 */
exports.useResponsiveMode = function (elementRef) {
    var _a = React.useState(withResponsiveMode_1.getInitialResponsiveMode), lastResponsiveMode = _a[0], setLastResponsiveMode = _a[1];
    var onResize = React.useCallback(function () {
        // Setting the same value should not cause a re-render.
        var newResponsiveMode = withResponsiveMode_1.getResponsiveMode(utilities_1.getWindow(elementRef.current));
        if (lastResponsiveMode !== newResponsiveMode) {
            setLastResponsiveMode(newResponsiveMode);
        }
    }, [elementRef, lastResponsiveMode]);
    react_hooks_1.useOnEvent(window, 'resize', onResize);
    // Call resize function initially on mount.
    React.useEffect(function () {
        onResize();
        // eslint-disable-next-line react-hooks/exhaustive-deps -- only meant to run on mount
    }, []);
    return lastResponsiveMode;
};
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