| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| import {Listener, Order, Phase} from "./tobago-listener"; |
| import {DomUtils} from "./tobago-utils"; |
| |
| class Scroll { |
| |
| static initScrollPosition = function (element: HTMLElement): void { |
| for (const panel of DomUtils.selfOrQuerySelectorAll(element, "[data-tobago-scroll-panel]")) { |
| |
| const hidden = panel.querySelector(":scope > [data-tobago-scroll-position]") as HTMLInputElement; |
| const values: number[] = JSON.parse(hidden.value); |
| if (values.length === 2) { |
| panel.scrollLeft = values[0]; |
| panel.scrollTop = values[1]; |
| } else { |
| console.warn("Wrong syntax for scroll: " + hidden.value); |
| } |
| |
| panel.addEventListener("scroll", Scroll.scroll); |
| } |
| }; |
| |
| static scroll = function (event: Event): void { |
| const panel = event.currentTarget as HTMLDivElement; |
| const scrollLeft = panel.scrollLeft; |
| const scrollTop = panel.scrollTop; |
| const hidden = panel.querySelector(":scope > [data-tobago-scroll-position]") as HTMLInputElement; |
| hidden.value = JSON.stringify([scrollLeft, scrollTop]); |
| }; |
| } |
| |
| Listener.register(Scroll.initScrollPosition, Phase.DOCUMENT_READY, Order.LATER); |
| Listener.register(Scroll.initScrollPosition, Phase.AFTER_UPDATE, Order.LATER); |