office-ui-fabric-react/lib-amd/utilities/decorators/withViewport.js

Reusable React components for building experiences for Office 365.

var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var __assign = (this && this.__assign) || Object.assign || function(t) {
    for (var s, i = 1, n = arguments.length; i < n; i++) {
        s = arguments[i];
        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
            t[p] = s[p];
    }
    return t;
};
define(["require", "exports", 'react', './BaseDecorator', '../../utilities/scroll', '../../utilities/dom'], function (require, exports, React, BaseDecorator_1, scroll_1, dom_1) {
    "use strict";
    var RESIZE_DELAY = 500;
    function withViewport(ComposedComponent) {
        return (function (_super) {
            __extends(WithViewportComponent, _super);
            function WithViewportComponent() {
                _super.call(this);
                this.state = {
                    viewport: {
                        width: 0,
                        height: 0
                    }
                };
            }
            WithViewportComponent.prototype.componentDidMount = function () {
                this._onAsyncResize = this._async.debounce(this._onAsyncResize, RESIZE_DELAY, {
                    leading: false
                });
                this._events.on(window, 'resize', this._onAsyncResize);
                this._updateViewport();
            };
            WithViewportComponent.prototype.componentWillUnmount = function () {
                this._events.dispose();
            };
            WithViewportComponent.prototype.render = function () {
                var viewport = this.state.viewport;
                var isViewportVisible = viewport.width > 0 && viewport.height > 0;
                return (React.createElement("div", {className: 'ms-Viewport', ref: 'root', style: { minWidth: 1, minHeight: 1 }}, isViewportVisible && (React.createElement(ComposedComponent, __assign({ref: this._updateComposedComponentRef, viewport: viewport}, this.props)))));
            };
            WithViewportComponent.prototype.forceUpdate = function () {
                this._updateViewport(true);
            };
            WithViewportComponent.prototype._onAsyncResize = function () {
                this._updateViewport();
            };
            WithViewportComponent.prototype._updateViewport = function (withForceUpdate) {
                var _this = this;
                var viewport = this.state.viewport;
                var viewportElement = this.refs.root;
                var scrollElement = scroll_1.findScrollableParent(viewportElement);
                var scrollRect = dom_1.getRect(scrollElement);
                var clientRect = dom_1.getRect(viewportElement);
                var updateComponent = function () {
                    if (withForceUpdate && _this._composedComponentInstance) {
                        _this._composedComponentInstance.forceUpdate();
                    }
                };
                var isSizeChanged = (clientRect.width !== viewport.width ||
                    scrollRect.height !== viewport.height);
                if (isSizeChanged) {
                    this.setState({
                        viewport: {
                            width: clientRect.width,
                            height: scrollRect.height
                        }
                    }, updateComponent);
                }
                else {
                    updateComponent();
                }
            };
            return WithViewportComponent;
        }(BaseDecorator_1.BaseDecorator));
    }
    exports.withViewport = withViewport;
});

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