feat(list): add j/k keyboard navigation (#1040)

Partially resolves https://community.vikunja.io/t/keyboard-shortcut-next-previous-tasks-in-a-project/1971/7?u=kolaente

frontend/src/components/misc/keyboard-shortcuts/shortcuts.ts

@@ -60,6 +60,24 @@ export const KEYBOARD_SHORTCUTS: ShortcutGroup[] = [
 			},
 		],
 	},
+	{
+		title: 'keyboardShortcuts.list.title',
+		available: (route) => route.name === 'project.view',
+		shortcuts: [
+			{
+				title: 'keyboardShortcuts.list.navigateDown',
+				keys: ['j'],
+			},
+			{
+				title: 'keyboardShortcuts.list.navigateUp',
+				keys: ['k'],
+			},
+			{
+				title: 'keyboardShortcuts.list.open',
+				keys: ['enter'],
+			},
+		],
+	},
 	{
 		title: 'project.kanban.title',
 		available: (route) => route.name === 'project.view',

frontend/src/components/project/views/ProjectList.vue

@@ -65,8 +65,9 @@
 						@start="() => drag = true"
 						@end="saveTaskPosition"
 					>
-						<template #item="{element: t}">
+						<template #item="{element: t, index}">
 							<SingleTaskInProject
+								:ref="(el) => setTaskRef(el, index)"
 								:show-list-color="false"
 								:disabled="!canDragTasks"
 								:can-mark-as-done="canWrite || isPseudoProject"
@@ -95,7 +96,7 @@
 
 
 <script setup lang="ts">
-import {ref, computed, nextTick, onMounted, watch} from 'vue'
+import {ref, computed, nextTick, onMounted, onBeforeUnmount, watch} from 'vue'
 import draggable from 'zhyswan-vuedraggable'
 
 import ProjectWrapper from '@/components/project/ProjectWrapper.vue'
@@ -271,6 +272,70 @@ function prepareFiltersAndLoadTasks() {
 
 	loadTasks()
 }
+
+const taskRefs = ref<(InstanceType<typeof SingleTaskInProject> | null)[]>([])
+const focusedIndex = ref(-1)
+
+function setTaskRef(el: InstanceType<typeof SingleTaskInProject> | null, index: number) {
+	if (el === null) {
+		delete taskRefs.value[index]
+	} else {
+		taskRefs.value[index] = el
+	}
+}
+
+function focusTask(index: number) {
+	if (index < 0 || index >= tasks.value.length) {
+		return
+	}
+
+	const taskRef = taskRefs.value[index]
+
+	focusedIndex.value = index
+	taskRef?.focus()
+}
+
+function handleListNavigation(e: KeyboardEvent) {
+	if (e.target instanceof HTMLElement && (e.target.closest('input, textarea, select, [contenteditable="true"]'))) {
+		return
+	}
+
+	if (e.key === 'j') {
+		e.preventDefault()
+		focusTask(Math.min(focusedIndex.value + 1, tasks.value.length - 1))
+		return
+	}
+
+	if (e.key === 'k') {
+		e.preventDefault()
+		if (focusedIndex.value === -1) {
+			focusTask(tasks.value.length - 1)
+			return
+		}
+
+		if (focusedIndex.value === 0) {
+			addTaskRef.value?.focusTaskInput()
+			focusedIndex.value = -1
+			return
+		}
+
+		focusTask(Math.max(focusedIndex.value - 1, 0))
+		return
+	}
+
+	if (e.key === 'Enter') {
+		e.preventDefault()
+		taskRefs.value[focusedIndex.value]?.click(e)
+	}
+}
+
+onMounted(() => {
+	document.addEventListener('keydown', handleListNavigation)
+})
+
+onBeforeUnmount(() => {
+	document.removeEventListener('keydown', handleListNavigation)
+})
 </script>
 
 <style lang="scss" scoped>

frontend/src/components/tasks/partials/SingleTaskInProject.vue

@@ -1,6 +1,7 @@
 <template>
 	<div>
 		<div
+			ref="taskRoot"
 			:class="{'is-loading': taskService.loading}"
 			class="task loader-container single-task"
 			tabindex="-1"
@@ -347,6 +348,7 @@ async function toggleFavorite() {
 	emit('taskUpdated', task.value)
 }
 
+const taskRoot = ref<HTMLElement | null>(null)
 const taskLinkRef = ref<HTMLElement | null>(null)
 
 function hasTextSelected() {
@@ -364,6 +366,11 @@ function openTaskDetail(event: MouseEvent | KeyboardEvent) {
 
 	taskLinkRef.value?.$el.click()
 }
+
+defineExpose({
+	focus: () => taskRoot.value?.focus(),
+	click: (e: MouseEvent | KeyboardEvent) => openTaskDetail(e),
+})
 </script>
 
 <style lang="scss" scoped>
@@ -381,7 +388,7 @@ function openTaskDetail(event: MouseEvent | KeyboardEvent) {
 		background-color: var(--grey-100);
 	}
 
-	&:has(*:focus-visible) {
+	&:has(*:focus-visible), &:focus {
 		box-shadow: 0 0 0 2px hsla(var(--primary-hsl), 0.5);
 
 		a.task-link {

frontend/src/i18n/lang/en.json

@@ -1076,6 +1076,12 @@
       "labels": "Navigate to labels",
       "teams": "Navigate to teams",
       "projects": "Navigate to projects"
+    },
+    "list": {
+      "title": "Task List",
+      "navigateDown": "Highlight next task",
+      "navigateUp": "Highlight previous task",
+      "open": "Open highlighted task"
     }
   },
   "update": {