office-ui-fabric-react/lib-es2015/components/List/examples/List.Scrolling.Example.js

Reusable React components for building experiences for Office 365.

import * as tslib_1 from "tslib";
import * as React from 'react';
import { css, autobind } from 'office-ui-fabric-react/lib/Utilities';
import { FocusZone, FocusZoneDirection } from 'office-ui-fabric-react/lib/FocusZone';
import { DefaultButton } from 'office-ui-fabric-react/lib/Button';
import { List } from 'office-ui-fabric-react/lib/List';
import { TextField } from 'office-ui-fabric-react/lib/TextField';
import './List.Scrolling.Example.scss';
var evenItemHeight = 25;
var oddItemHeight = 50;
var numberOfItemsOnPage = 10;
var ListScrollingExample = /** @class */ (function (_super) {
    tslib_1.__extends(ListScrollingExample, _super);
    function ListScrollingExample(props) {
        var _this = _super.call(this, props) || this;
        _this.state = {
            selectedIndex: 0
        };
        return _this;
    }
    ListScrollingExample.prototype.render = function () {
        var items = this.props.items;
        return (React.createElement(FocusZone, { direction: FocusZoneDirection.vertical },
            React.createElement("div", null,
                React.createElement(DefaultButton, { onClick: this._scrollRelative(-10) }, "-10"),
                React.createElement(DefaultButton, { onClick: this._scrollRelative(-1) }, "-1"),
                React.createElement(DefaultButton, { onClick: this._scrollRelative(1) }, "+1"),
                React.createElement(DefaultButton, { onClick: this._scrollRelative(10) }, "+10")),
            React.createElement("div", null,
                "Scroll item index:",
                React.createElement(TextField, { value: this.state.selectedIndex.toString(10), onChanged: this._onChangeText })),
            React.createElement("div", { className: 'ms-ListScrollingExample-container', "data-is-scrollable": true },
                React.createElement(List, { ref: this._resolveList, items: items, getPageHeight: this._getPageHeight, onRenderCell: this._onRenderCell }))));
    };
    ListScrollingExample.prototype._getPageHeight = function (idx) {
        var h = 0;
        for (var i = idx; i < idx + numberOfItemsOnPage; ++i) {
            var isEvenRow = i % 2 === 0;
            h += isEvenRow ? evenItemHeight : oddItemHeight;
        }
        return h;
    };
    ListScrollingExample.prototype._onChangeText = function (value) {
        this._scroll(parseInt(value, 10) || 0);
    };
    ListScrollingExample.prototype._onRenderCell = function (item, index) {
        return (React.createElement("div", { className: 'ms-ListScrollingExample-itemCell', "data-is-focusable": true },
            React.createElement("div", { className: css('ms-ListScrollingExample-itemContent', (index % 2 === 0) && 'ms-ListScrollingExample-itemContent-even', (index % 2 === 1) && 'ms-ListScrollingExample-itemContent-odd') },
                index,
                " \u00A0 ",
                item.name)));
    };
    ListScrollingExample.prototype._scrollRelative = function (delta) {
        var _this = this;
        return function () {
            _this._scroll(_this.state.selectedIndex + delta);
        };
    };
    ListScrollingExample.prototype._scroll = function (index) {
        var _this = this;
        var updatedSelectedIndex = Math.min(Math.max(index, 0), this.props.items.length - 1);
        this.setState({
            selectedIndex: updatedSelectedIndex
        }, function () {
            _this._list.scrollToIndex(updatedSelectedIndex, function (idx) { return idx % 2 === 0 ? evenItemHeight : oddItemHeight; });
        });
    };
    ListScrollingExample.prototype._resolveList = function (list) {
        this._list = list;
    };
    tslib_1.__decorate([
        autobind
    ], ListScrollingExample.prototype, "_onChangeText", null);
    tslib_1.__decorate([
        autobind
    ], ListScrollingExample.prototype, "_resolveList", null);
    return ListScrollingExample;
}(React.Component));
export { ListScrollingExample };
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