office-ui-fabric-react/lib-amd/utilities/selection/SelectionLayout.js

Reusable React components for building experiences for Office 365.

define(["require", "exports", './interfaces'], function (require, exports, interfaces_1) {
    "use strict";
    var SelectionLayout = (function () {
        function SelectionLayout(direction) {
            this._direction = direction;
        }
        SelectionLayout.prototype.getItemIndexAbove = function (focusIndex, items) {
            return (this._direction === interfaces_1.SelectionDirection.vertical) ? Math.max(0, focusIndex - 1) : focusIndex;
        };
        SelectionLayout.prototype.getItemIndexBelow = function (focusIndex, items) {
            return (this._direction === interfaces_1.SelectionDirection.vertical) ? Math.min(items.length - 1, focusIndex + 1) : focusIndex;
        };
        SelectionLayout.prototype.getItemIndexLeft = function (focusIndex, items) {
            return (this._direction === interfaces_1.SelectionDirection.vertical) ? focusIndex : Math.max(0, focusIndex - 1);
        };
        SelectionLayout.prototype.getItemIndexRight = function (focusIndex, items) {
            return (this._direction === interfaces_1.SelectionDirection.vertical) ? focusIndex : Math.min(items.length - 1, focusIndex + 1);
        };
        return SelectionLayout;
    }());
    exports.SelectionLayout = SelectionLayout;
});