office-ui-fabric-react/lib-amd/utilities/rtl.js

Reusable React components for building experiences for Office 365.

define(["require", "exports", './KeyCodes', './dom'], function (require, exports, KeyCodes_1, dom_1) {
    "use strict";
    var _isRTL = false;
    /**
     * Gets the rtl state of the page (returns true if in rtl.)
     */
    function getRTL() {
        if (_isRTL === undefined) {
            var doc = dom_1.getDocument();
            if (doc) {
                _isRTL = document.documentElement.getAttribute('dir') === 'rtl';
            }
            else {
                throw new Error('getRTL was called in a server environment without setRTL being called first. ' +
                    'Call setRTL to set the correct direction first.');
            }
        }
        return _isRTL;
    }
    exports.getRTL = getRTL;
    /**
     * Sets the rtl state of the page (by adjusting the dir attribute of the html element.)
     */
    function setRTL(isRTL) {
        var doc = dom_1.getDocument();
        if (doc) {
            doc.documentElement.setAttribute('dir', isRTL ? 'rtl' : 'ltr');
        }
        _isRTL = isRTL;
    }
    exports.setRTL = setRTL;
    /**
     * Returns the given key, but flips right/left arrows if necessary.
     */
    function getRTLSafeKeyCode(key) {
        if (getRTL()) {
            if (key === KeyCodes_1.KeyCodes.left) {
                key = KeyCodes_1.KeyCodes.right;
            }
            else if (key === KeyCodes_1.KeyCodes.right) {
                key = KeyCodes_1.KeyCodes.left;
            }
        }
        return key;
    }
    exports.getRTLSafeKeyCode = getRTLSafeKeyCode;
});