fix(frontend): フォーカス/タブ移動に関する挙動を調整

packages/frontend/src/components/MkContextMenu.vue

@@ -12,7 +12,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	:leaveToClass="defaultStore.state.animation ? $style.transition_fade_leaveTo : ''"
 >
 	<div ref="rootEl" :class="$style.root" :style="{ zIndex }" @contextmenu.prevent.stop="() => {}">
-		<MkMenu :items="items" :align="'left'" @close="emit('closed')"/>
+		<MkMenu :items="items" :align="'left'" :returnFocusElement="returnFocusElement" @close="emit('closed')"/>
 	</div>
 </Transition>
 </template>
@@ -28,6 +28,7 @@ import * as os from '@/os.js';
 const props = defineProps<{
 	items: MenuItem[];
 	ev: MouseEvent;
+	returnFocusElement?: HTMLElement | null;
 }>();
 
 const emit = defineEmits<{

packages/frontend/src/components/MkImgWithBlurhash.vue

@@ -14,8 +14,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		:enterToClass="defaultStore.state.animation && props.transition?.enterToClass || undefined"
 		:leaveFromClass="defaultStore.state.animation && props.transition?.leaveFromClass || undefined"
 	>
-		<canvas v-show="hide" key="canvas" ref="canvas" :class="$style.canvas" :width="canvasWidth" :height="canvasHeight" :title="title ?? undefined"/>
-		<img v-show="!hide" key="img" ref="img" :height="imgHeight ?? undefined" :width="imgWidth ?? undefined" :class="$style.img" :src="src ?? undefined" :title="title ?? undefined" :alt="alt ?? undefined" loading="eager" decoding="async"/>
+		<canvas v-show="hide" key="canvas" ref="canvas" :class="$style.canvas" :width="canvasWidth" :height="canvasHeight" :title="title ?? undefined" tabindex="-1"/>
+		<img v-show="!hide" key="img" ref="img" :height="imgHeight ?? undefined" :width="imgWidth ?? undefined" :class="$style.img" :src="src ?? undefined" :title="title ?? undefined" :alt="alt ?? undefined" loading="eager" decoding="async" tabindex="-1"/>
 	</TransitionGroup>
 </div>
 </template>

packages/frontend/src/components/MkMediaImage.vue

@@ -24,8 +24,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 				title: imageRef.name,
 				class: $style.imageContainer,
 				href: imageRef.url,
-				style: 'cursor: zoom-in;'
+				style: 'cursor: zoom-in;',
 			}"
+			tabindex="-1"
 		>
 			<MkImgWithBlurhash
 				:hash="imageRef.blurhash"
@@ -196,6 +197,10 @@ const showImageMenu = (ev: MouseEvent) => {
 	overflow: hidden; // fallback (overflow: clip)
 	overflow: clip;
 	border-radius: var(--mediaList-radius, 8px);
+
+	&:focus {
+		outline: none;
+	}
 }
 
 .rootVisible {

packages/frontend/src/components/MkMediaList.vue

@@ -39,6 +39,7 @@ import 'photoswipe/style.css';
 import { FILE_TYPE_BROWSERSAFE } from '@/const.js';
 import { claimZIndex } from '@/os.js';
 import { defaultStore } from '@/store.js';
+import { focusParent } from '@/scripts/tms/focus.js';
 import XAudio from '@/components/MkMediaAudio.vue';
 import XBanner from '@/components/MkMediaBanner.vue';
 import XImage from '@/components/MkMediaImage.vue';
@@ -55,7 +56,9 @@ const gallery = shallowRef<HTMLDivElement>();
 const pswpZIndex = claimZIndex('middle');
 document.documentElement.style.setProperty('--mk-pswp-root-z-index', pswpZIndex.toString());
 const count = computed(() => props.mediaList.filter(media => previewable(media)).length);
-let lightbox: PhotoSwipeLightbox | null;
+let lightbox: PhotoSwipeLightbox | null = null;
+
+let activeEl: HTMLElement | null = null;
 
 const popstateHandler = (): void => {
 	if (lightbox?.pswp && lightbox.pswp.isOpen === true) {
@@ -66,7 +69,7 @@ const popstateHandler = (): void => {
 async function calcAspectRatio() {
 	if (!gallery.value) return;
 
-	let img = props.mediaList[0];
+	const img = props.mediaList[0];
 
 	if (props.mediaList.length !== 1 || !(img.properties.width && img.properties.height)) {
 		gallery.value.style.aspectRatio = '';
@@ -141,6 +144,7 @@ onMounted(() => {
 		bgOpacity: 1,
 		showAnimationDuration: 100,
 		hideAnimationDuration: 100,
+		returnFocus: false,
 		pswpModule: PhotoSwipe,
 	});
 
@@ -169,46 +173,64 @@ onMounted(() => {
 	lightbox.on('uiRegister', () => {
 		lightbox?.pswp?.ui?.registerElement({
 			name: 'altText',
-			className: 'pwsp__alt-text-container',
+			className: 'pswp__alt-text-container',
 			appendTo: 'wrapper',
-			onInit: (el, pwsp) => {
-				let textBox = document.createElement('p');
-				textBox.className = 'pwsp__alt-text _acrylic';
+			onInit: (el, pswp) => {
+				const textBox = document.createElement('p');
+				textBox.className = 'pswp__alt-text _acrylic';
 				el.appendChild(textBox);
 
-				pwsp.on('change', () => {
-					textBox.textContent = pwsp.currSlide?.data.comment;
+				pswp.on('change', () => {
+					textBox.textContent = pswp.currSlide?.data.comment;
 				});
 			},
 		});
 	});
 
-	lightbox.init();
-
-	window.addEventListener('popstate', popstateHandler);
-
-	lightbox.on('beforeOpen', () => {
+	lightbox.on('afterInit', () => {
+		activeEl = document.activeElement instanceof HTMLElement ? document.activeElement : null;
+		focusParent(activeEl, true, true);
+		lightbox?.pswp?.element?.focus({
+			preventScroll: true,
+		});
 		history.pushState(null, '', '#pswp');
 	});
 
-	lightbox.on('close', () => {
+	lightbox.on('destroy', () => {
+		focusParent(activeEl, true, false);
+		activeEl = null;
 		if (window.location.hash === '#pswp') {
 			history.back();
 		}
 	});
+
+	window.addEventListener('popstate', popstateHandler);
+
+	lightbox.init();
 });
 
 onUnmounted(() => {
 	window.removeEventListener('popstate', popstateHandler);
 	lightbox?.destroy();
 	lightbox = null;
+	activeEl = null;
 });
 
 const previewable = (file: Misskey.entities.DriveFile): boolean => {
 	if (file.type === 'image/svg+xml') return true; // svgのwebpublic/thumbnailはpngなのでtrue
 	// FILE_TYPE_BROWSERSAFEに適合しないものはブラウザで表示するのに不適切
 	return (file.type.startsWith('video') || file.type.startsWith('image')) && FILE_TYPE_BROWSERSAFE.includes(file.type);
 };
+
+const openGallery = () => {
+	if (props.mediaList.filter(media => previewable(media)).length > 0) {
+		lightbox?.loadAndOpen(0);
+	}
+};
+
+defineExpose({
+	openGallery,
+});
 </script>
 
 <style lang="scss" module>
@@ -331,7 +353,7 @@ const previewable = (file: Misskey.entities.DriveFile): boolean => {
 	backdrop-filter: var(--modalBgFilter);
 }
 
-.pwsp__alt-text-container {
+.pswp__alt-text-container {
 	display: flex;
 	flex-direction: row;
 	align-items: center;
@@ -345,7 +367,7 @@ const previewable = (file: Misskey.entities.DriveFile): boolean => {
 	max-width: 800px;
 }
 
-.pwsp__alt-text {
+.pswp__alt-text {
 	color: var(--fg);
 	margin: 0 auto;
 	text-align: center;

packages/frontend/src/components/MkMenu.child.vue

@@ -10,7 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { nextTick, onMounted, onUnmounted, shallowRef, watch } from 'vue';
+import { nextTick, onMounted, onUnmounted, provide, shallowRef, watch } from 'vue';
 import MkMenu from './MkMenu.vue';
 import { MenuItem } from '@/types/menu.js';
 
@@ -19,14 +19,15 @@ const props = defineProps<{
 	targetElement: HTMLElement;
 	rootElement: HTMLElement;
 	width?: number;
-	viaKeyboard?: boolean;
 }>();
 
 const emit = defineEmits<{
 	(ev: 'closed'): void;
 	(ev: 'actioned'): void;
 }>();
 
+provide('isNestingMenu', true);
+
 const el = shallowRef<HTMLElement>();
 const align = 'left';