forked from mystiq/hydrogen-web
96 lines
3 KiB
JavaScript
96 lines
3 KiB
JavaScript
/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {TemplateView} from "../../general/TemplateView.js";
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import {spinner} from "../../common.js";
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export class LightboxView extends TemplateView {
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render(t, vm) {
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const close = t.a({href: vm.closeUrl, title: vm.i18n`Close`, className: "close"});
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const image = t.div({
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role: "img",
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"aria-label": vm => vm.name,
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title: vm => vm.name,
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className: {
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picture: true,
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hidden: vm => !vm.imageUrl,
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},
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style: vm => `background-image: url('${vm.imageUrl}'); max-width: ${vm.imageWidth}px; max-height: ${vm.imageHeight}px;`
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});
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const loading = t.div({
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className: {
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loading: true,
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hidden: vm => !!vm.imageUrl
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}
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}, [
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spinner(t),
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t.div(vm.i18n`Loading image…`)
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]);
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const details = t.div({
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className: "details"
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}, [t.strong(vm => vm.name), t.br(), "uploaded by ", t.strong(vm => vm.sender), vm => ` at ${vm.time} on ${vm.date}.`]);
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const dialog = t.div({
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role: "dialog",
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className: "lightbox",
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onClick: evt => this.clickToClose(evt),
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onKeydown: evt => this.closeOnEscKey(evt)
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}, [image, loading, details, close]);
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trapFocus(t, dialog);
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return dialog;
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}
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clickToClose(evt) {
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if (evt.target === this.root()) {
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this.value.close();
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}
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}
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closeOnEscKey(evt) {
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if (evt.key === "Escape" || evt.key === "Esc") {
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this.value.close();
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}
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}
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}
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function trapFocus(t, element) {
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const elements = focusables(element);
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const first = elements[0];
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const last = elements[elements.length - 1];
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t.addEventListener(element, "keydown", evt => {
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if (evt.key === "Tab") {
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if (evt.shiftKey) {
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if (document.activeElement === first) {
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last.focus();
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evt.preventDefault();
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}
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} else {
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if (document.activeElement === last) {
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first.focus();
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evt.preventDefault();
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}
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}
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}
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}, true);
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Promise.resolve().then(() => {
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first.focus();
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});
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}
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function focusables(element) {
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return element.querySelectorAll('a[href], button, textarea, input, select');
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}
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