feat: make time reactive (#2627)

Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2627
Reviewed-by: konrad <k@knt.li>
Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Co-committed-by: Dominik Pschenitschni <mail@celement.de>

frontend/src/components/date/DatemathHelp.vue

@@ -122,11 +122,14 @@
 </template>
 
 <script lang="ts" setup>
+import {computed} from 'vue'
+import {useGlobalNow} from '@/composables/useGlobalNow'
 import {formatDateShort} from '@/helpers/time/formatDate'
 
 import BaseButton from '@/components/base/BaseButton.vue'
 
-const exampleDate = formatDateShort(new Date())
+const {now} = useGlobalNow()
+const exampleDate = computed(() => formatDateShort(now.value))
 </script>
 
 <style scoped lang="scss">

frontend/src/components/tasks/GanttChart.vue

@@ -43,9 +43,11 @@
 </template>
 
 <script setup lang="ts">
-import {computed, ref, watch, toRefs, onActivated} from 'vue'
+import {computed, ref, watch, toRefs} from 'vue'
 import {useRouter} from 'vue-router'
 
+import { useGlobalNow } from '@/composables/useGlobalNow'
+
 import {getHexColor} from '@/models/task'
 
 import {colorIsDark} from '@/helpers/color/colorIsDark'
@@ -122,7 +124,7 @@ const GANTT_COLOR_SCHEME: ColorScheme = {
 	hoverHighlight: 'var(--grey-700)',
 	text: 'var(--grey-800)',
 	background: 'var(--white)',
-}
+} as const
 
 /**
  * Update ganttBars when tasks change
@@ -198,8 +200,7 @@ function openTask(e: {
 
 const weekDayFromDate = useWeekDayFromDate()
 
-const today = ref(new Date())
-onActivated(() => today.value = new Date())
+const {now: today} = useGlobalNow()
 const dateIsToday = computed(() => (date: Date) => {
 	return (
 		date.getDate() === today.value.getDate() &&

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

@@ -46,7 +46,7 @@
 			<span
 				v-if="task.dueDate > 0"
 				v-tooltip="formatDateLong(task.dueDate)"
-				:class="{'overdue': task.dueDate <= new Date() && !task.done}"
+				:class="{'overdue': isOverdue}"
 				class="due-date"
 			>
 				<span class="icon">
@@ -107,6 +107,8 @@
 import {computed, ref, watch} from 'vue'
 import {useRouter} from 'vue-router'
 
+import {useGlobalNow} from '@/composables/useGlobalNow'
+
 import PriorityLabel from '@/components/tasks/partials/PriorityLabel.vue'
 import ProgressBar from '@/components/misc/ProgressBar.vue'
 import Done from '@/components/misc/Done.vue'
@@ -145,7 +147,7 @@ const projectStore = useProjectStore()
 
 const projectTitle = computed(() => {
 	if (props.projectId === props.task.projectId) {
-		return false
+		return
 	}
 	
 	const project = projectStore.projects[props.task.projectId]
@@ -154,6 +156,14 @@ const projectTitle = computed(() => {
 
 const showTaskPosition = computed(() => window.DEBUG_TASK_POSITION)
 
+const {now} = useGlobalNow()
+const isOverdue = computed(() => (
+	!props.task.done &&
+	props.task.dueDate !== null &&
+	props.task.dueDate.getTime() > 0 &&
+	props.task.dueDate.getTime() <= now.value.getTime()
+))
+
 async function toggleTaskDone(task: ITask) {
 	loadingInternal.value = true
 	try {

frontend/src/composables/useGlobalNow.ts

@@ -0,0 +1,30 @@
+import { ref } from 'vue'
+import { createGlobalState, useIntervalFn } from '@vueuse/core'
+import { onBeforeRouteUpdate } from 'vue-router'
+
+import { MILLISECONDS_A_SECOND } from '@/constants/date'
+
+const GLOBAL_NOW_INTERVAL = 60 * MILLISECONDS_A_SECOND
+
+/**
+ * A global shared state that provides the current time, updated at a regular interval.
+ * 
+ * Sharing this state globally ensures that all components accessing this hook use the same time reference, avoiding redundant intervals and ensuring consistency across the application.
+ */
+export const useGlobalNow = createGlobalState(() => {
+	const now = ref(new Date())
+
+	const update = () => now.value = new Date()
+
+	useIntervalFn(update, GLOBAL_NOW_INTERVAL, { immediate: true })
+
+	// ensure the now value is refreshed when the route changes
+	onBeforeRouteUpdate(() => {
+		update()
+	})
+
+	return {
+		now,
+		update,
+	}
+})