office-ui-fabric-react/lib-es2015/components/FocusTrapZone/FocusTrapZone.js

Reusable React components for building experiences for Office 365.

import * as tslib_1 from "tslib";
import * as React from 'react';
import { BaseComponent, autobind, elementContains, getNativeProps, divProperties, getFirstFocusable, getLastTabbable, getNextElement } from '../../Utilities';
var FocusTrapZone = /** @class */ (function (_super) {
    tslib_1.__extends(FocusTrapZone, _super);
    function FocusTrapZone() {
        var _this = _super !== null && _super.apply(this, arguments) || this;
        _this._isInFocusStack = false;
        _this._isInClickStack = false;
        return _this;
    }
    FocusTrapZone.prototype.componentWillMount = function () {
        var _a = this.props, _b = _a.isClickableOutsideFocusTrap, isClickableOutsideFocusTrap = _b === void 0 ? false : _b, _c = _a.forceFocusInsideTrap, forceFocusInsideTrap = _c === void 0 ? true : _c;
        if (forceFocusInsideTrap) {
            this._isInFocusStack = true;
            FocusTrapZone._focusStack.push(this);
        }
        if (!isClickableOutsideFocusTrap) {
            this._isInClickStack = true;
            FocusTrapZone._clickStack.push(this);
        }
    };
    FocusTrapZone.prototype.componentDidMount = function () {
        var _a = this.props, _b = _a.isClickableOutsideFocusTrap, isClickableOutsideFocusTrap = _b === void 0 ? false : _b, _c = _a.forceFocusInsideTrap, forceFocusInsideTrap = _c === void 0 ? true : _c, elementToFocusOnDismiss = _a.elementToFocusOnDismiss, _d = _a.disableFirstFocus, disableFirstFocus = _d === void 0 ? false : _d;
        this._previouslyFocusedElement = elementToFocusOnDismiss ? elementToFocusOnDismiss : document.activeElement;
        if (!elementContains(this._root, this._previouslyFocusedElement) && !disableFirstFocus) {
            this.focus();
        }
        if (forceFocusInsideTrap) {
            this._events.on(window, 'focus', this._forceFocusInTrap, true);
        }
        if (!isClickableOutsideFocusTrap) {
            this._events.on(window, 'click', this._forceClickInTrap, true);
        }
    };
    FocusTrapZone.prototype.componentWillReceiveProps = function (nextProps) {
        var elementToFocusOnDismiss = nextProps.elementToFocusOnDismiss;
        if (elementToFocusOnDismiss && this._previouslyFocusedElement !== elementToFocusOnDismiss) {
            this._previouslyFocusedElement = elementToFocusOnDismiss;
        }
    };
    FocusTrapZone.prototype.componentWillUnmount = function () {
        var _this = this;
        var ignoreExternalFocusing = this.props.ignoreExternalFocusing;
        this._events.dispose();
        if (this._isInFocusStack || this._isInClickStack) {
            var filter = function (value) {
                return _this !== value;
            };
            if (this._isInFocusStack) {
                FocusTrapZone._focusStack = FocusTrapZone._focusStack.filter(filter);
            }
            if (this._isInClickStack) {
                FocusTrapZone._clickStack = FocusTrapZone._clickStack.filter(filter);
            }
        }
        if (!ignoreExternalFocusing && this._previouslyFocusedElement && typeof this._previouslyFocusedElement.focus === 'function') {
            this._previouslyFocusedElement.focus();
        }
    };
    FocusTrapZone.prototype.render = function () {
        var _a = this.props, className = _a.className, ariaLabelledBy = _a.ariaLabelledBy;
        var divProps = getNativeProps(this.props, divProperties);
        return (React.createElement("div", tslib_1.__assign({}, divProps, { className: className, ref: this._resolveRef('_root'), "aria-labelledby": ariaLabelledBy, onKeyDown: this._onKeyboardHandler }), this.props.children));
    };
    /**
     * Need to expose this method in case of popups since focus needs to be set when popup is opened
     */
    FocusTrapZone.prototype.focus = function () {
        var firstFocusableSelector = this.props.firstFocusableSelector;
        var focusSelector = typeof firstFocusableSelector === 'string'
            ? firstFocusableSelector
            : firstFocusableSelector && firstFocusableSelector();
        var _firstFocusableChild;
        if (focusSelector) {
            _firstFocusableChild = this._root.querySelector('.' + focusSelector);
        }
        else {
            _firstFocusableChild = getNextElement(this._root, this._root.firstChild, true, false, false, true);
        }
        if (_firstFocusableChild) {
            _firstFocusableChild.focus();
        }
    };
    FocusTrapZone.prototype._onKeyboardHandler = function (ev) {
        if (ev.which !== 9 /* tab */) {
            return;
        }
        var _firstFocusableChild = getFirstFocusable(this._root, this._root.firstChild, true);
        var _lastFocusableChild = getLastTabbable(this._root, this._root.lastChild, true);
        if (ev.shiftKey && _firstFocusableChild === ev.target) {
            _lastFocusableChild.focus();
            ev.preventDefault();
            ev.stopPropagation();
        }
        else if (!ev.shiftKey && _lastFocusableChild === ev.target) {
            _firstFocusableChild.focus();
            ev.preventDefault();
            ev.stopPropagation();
        }
    };
    FocusTrapZone.prototype._forceFocusInTrap = function (ev) {
        if (FocusTrapZone._focusStack.length && this === FocusTrapZone._focusStack[FocusTrapZone._focusStack.length - 1]) {
            var focusedElement = document.activeElement;
            if (!elementContains(this._root, focusedElement)) {
                this.focus();
                ev.preventDefault();
                ev.stopPropagation();
            }
        }
    };
    FocusTrapZone.prototype._forceClickInTrap = function (ev) {
        if (FocusTrapZone._clickStack.length && this === FocusTrapZone._clickStack[FocusTrapZone._clickStack.length - 1]) {
            var clickedElement = ev.target;
            if (clickedElement && !elementContains(this._root, clickedElement)) {
                this.focus();
                ev.preventDefault();
                ev.stopPropagation();
            }
        }
    };
    FocusTrapZone._focusStack = [];
    FocusTrapZone._clickStack = [];
    tslib_1.__decorate([
        autobind
    ], FocusTrapZone.prototype, "_onKeyboardHandler", null);
    return FocusTrapZone;
}(BaseComponent));
export { FocusTrapZone };
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