@awsui/components-react/internal/focus-tracker.js

AWS UI is a collection of [React](https://reactjs.org/) components that help create intuitive, responsive, and accessible user experiences for web applications. It is developed by Amazon Web Services (AWS). This work is available under the terms of the [A

function containsOrEqual(container, node) {
    return container === node || container.contains(node);
}
var FocusTracker = (function () {
    function FocusTracker(node, _a) {
        var _this = this;
        var onFocusEnter = _a.onFocusEnter, onFocusLeave = _a.onFocusLeave;
        this.node = node;
        this.currentlyFocused = false;
        this.focusInListener = function (event) {
            var focusIsInside = containsOrEqual(_this.node, event.target);
            if (!_this.currentlyFocused && focusIsInside) {
                _this.triggerFocus();
            }
        };
        this.focusOutListener = function (event) {
            var nextFocused = event.relatedTarget;
            if (_this.currentlyFocused && (nextFocused === null || !containsOrEqual(_this.node, nextFocused))) {
                _this.triggerBlur();
            }
        };
        this.onFocusEnter = onFocusEnter;
        this.onFocusLeave = onFocusLeave;
    }
    FocusTracker.prototype.initialize = function () {
        this.currentlyFocused = containsOrEqual(this.node, document.activeElement);
        document.addEventListener('focusin', this.focusInListener);
        document.addEventListener('focusout', this.focusOutListener);
    };
    FocusTracker.prototype.destroy = function () {
        document.removeEventListener('focusin', this.focusInListener);
        document.removeEventListener('focusout', this.focusOutListener);
    };
    FocusTracker.prototype.triggerBlur = function () {
        this.currentlyFocused = false;
        this.onFocusLeave();
    };
    FocusTracker.prototype.triggerFocus = function () {
        this.currentlyFocused = true;
        this.onFocusEnter();
    };
    return FocusTracker;
}());
export default FocusTracker;