enh(NcContent): Add skip content buttons

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

l10n/messages.pot

@@ -304,6 +304,12 @@ msgstr ""
 msgid "Show password"
 msgstr ""
 
+msgid "Skip to app navigation"
+msgstr ""
+
+msgid "Skip to main content"
+msgstr ""
+
 msgid "Smart Picker"
 msgstr ""
 

package.json

@@ -65,6 +65,7 @@
   ],
   "dependencies": {
     "@floating-ui/dom": "^1.1.0",
+    "@linusborg/vue-simple-portal": "^0.1.5",
     "@nextcloud/auth": "^2.0.0",
     "@nextcloud/axios": "^2.0.0",
     "@nextcloud/browser-storage": "^0.3.0",

src/components/NcAppNavigation/NcAppNavigation.vue

@@ -78,21 +78,29 @@ emit('toggle-navigation', {
 </template>
 
 <script>
-import NcAppNavigationToggle from '../NcAppNavigationToggle/index.js'
 import { useIsMobile } from '../../composables/useIsMobile/index.js'
 import { getTrapStack } from '../../utils/focusTrap.js'
-
 import { emit, subscribe, unsubscribe } from '@nextcloud/event-bus'
-
 import { createFocusTrap } from 'focus-trap'
 
+import NcAppNavigationToggle from '../NcAppNavigationToggle/index.js'
+import Vue from 'vue'
+
 export default {
 	name: 'NcAppNavigation',
 
 	components: {
 		NcAppNavigationToggle,
 	},
 
+	// Injected from NcContent
+	inject: {
+		setHasAppNavigation: {
+			default: () => () => Vue.util.warn('NcAppNavigation is not mounted inside NcContent, this is probably an error.'),
+			from: 'NcContent:setHasAppNavigation',
+		},
+	},
+
 	props: {
 		/**
 		 * The aria label to describe the navigation
@@ -135,6 +143,7 @@ export default {
 	},
 
 	mounted() {
+		this.setHasAppNavigation(true)
 		subscribe('toggle-navigation', this.toggleNavigationByEventBus)
 		// Emit an event with the initial state of the navigation
 		emit('navigation-toggled', {
@@ -150,6 +159,7 @@ export default {
 		this.toggleFocusTrap()
 	},
 	unmounted() {
+		this.setHasAppNavigation(false)
 		unsubscribe('toggle-navigation', this.toggleNavigationByEventBus)
 		this.focusTrap.deactivate()
 	},
@@ -161,6 +171,14 @@ export default {
 		 * @param {boolean} [state] set the state instead of inverting the current one
 		 */
 		toggleNavigation(state) {
+			// Early return if alreay in that state
+			if (this.open === state) {
+				emit('navigation-toggled', {
+					open: this.open,
+				})
+				return
+			}
+
 			this.open = (typeof state === 'undefined') ? !this.open : state
 			const bodyStyles = getComputedStyle(document.body)
 			const animationLength = parseInt(bodyStyles.getPropertyValue('--animation-quick')) || 100

src/components/NcContent/NcContent.vue

@@ -28,6 +28,8 @@ This component provides the default container of all apps.
 It _MUST_ be used as the main wrapper of your app.
 It includes the Navigation, the App content and the Sidebar.
 
+It also will set the skip content buttons needed for accessibility.
+
 ### Standard usage
 
 ```vue
@@ -72,22 +74,84 @@ It includes the Navigation, the App content and the Sidebar.
 	<div id="content-vue"
 		:class="`app-${appName.toLowerCase()}`"
 		class="content">
+		<!-- TODO: with vue3 the `selector` attribute needs to be changed to `to="#skip-actions"` -->
+		<Teleport selector="#skip-actions">
+			<div class="skip-actions">
+				<NcButton type="primary" href="#app-content-vue">
+					{{ t('Skip to main content') }}
+				</NcButton>
+				<NcButton v-show="hasAppNavigation"
+					type="primary"
+					href="#app-navigation-vue"
+					@click.prevent="openAppNavigation">
+					{{ t('Skip to app navigation') }}
+				</NcButton>
+			</div>
+		</Teleport>
 		<slot />
 	</div>
 </template>
 
 <script>
+import { emit } from '@nextcloud/event-bus'
+import { t } from '../../l10n.js'
+
+import NcButton from '../NcButton/NcButton.vue'
+// TODO: This is built-in for vue3 just drop the import
+import { Portal as Teleport } from '@linusborg/vue-simple-portal'
+
 export default {
+	name: 'NcContent',
+	components: {
+		NcButton,
+		Teleport,
+	},
+	provide() {
+		return {
+			'NcContent:setHasAppNavigation': this.setAppNavigation,
+		}
+	},
 	props: {
 		appName: {
 			type: String,
 			required: true,
 		},
 	},
+	data() {
+		return {
+			hasAppNavigation: false,
+		}
+	},
+	beforeMount() {
+		const container = document.getElementById('skip-actions')
+		if (container) {
+			// clear default buttons
+			container.innerHTML = ''
+		}
+	},
+	methods: {
+		t,
+		openAppNavigation() {
+			emit('toggle-navigation', { open: true })
+			this.$nextTick(() => {
+				window.location.hash = 'app-navigation-vue'
+				// we need to manually focus if the window location is already set to the app-navigation then it will not focus again
+				document.getElementById('app-navigation-vue').focus()
+			})
+		},
+		setAppNavigation(value) {
+			this.hasAppNavigation = value
+		},
+	},
 }
 </script>
 
 <style lang="scss" scoped>
+.skip-actions {
+	display: flex;
+	gap: 12px;
+}
+
 .content {
 	box-sizing: border-box;
 	margin: var(--body-container-margin);