🎨

packages/frontend/src/components/global/MkPageHeader.tabs.vue

@@ -10,7 +10,7 @@
 						:class="$style.tabTitle">{{ t.title }}</div>
 					<Transition v-else @enter="enter" @after-enter="afterEnter" @leave="leave" @after-leave="afterLeave"
 						mode="in-out">
-						<div v-if="t.key === tab" :class="$style.tabTitle">{{ t.title }}</div>
+						<div v-show="t.key === tab" :class="[$style.tabTitle, $style.animate]">{{ t.title }}</div>
 					</Transition>
 				</div>
 			</button>
@@ -34,7 +34,7 @@ export type Tab = {
 </script>
 
 <script lang="ts" setup>
-import { onMounted, onUnmounted, watch, nextTick } from 'vue';
+import { onMounted, onUnmounted, watch, nextTick, Transition, shallowRef } from 'vue';
 import { defaultStore } from '@/store';
 
 const props = withDefaults(defineProps<{
@@ -50,9 +50,9 @@ const emit = defineEmits<{
 	(ev: 'tabClick', key: string);
 }>();
 
-let el = $shallowRef<HTMLElement | null>(null);
+const el = shallowRef<HTMLElement | null>(null);
 const tabRefs: Record<string, HTMLElement | null> = {};
-let tabHighlightEl = $shallowRef<HTMLElement | null>(null);
+const tabHighlightEl = shallowRef<HTMLElement | null>(null);
 
 function onTabMousedown(tab: Tab, ev: MouseEvent): void {
 	// ユーザビリティの観点からmousedown時にはonClickは呼ばない
@@ -77,13 +77,13 @@ function onTabClick(t: Tab, ev: MouseEvent): void {
 
 function renderTab() {
 	const tabEl = props.tab ? tabRefs[props.tab] : undefined;
-	if (tabEl && tabHighlightEl && tabHighlightEl.parentElement) {
+	if (tabEl && tabHighlightEl.value && tabHighlightEl.value.parentElement) {
 		// offsetWidth や offsetLeft は少数を丸めてしまうため getBoundingClientRect を使う必要がある
 		// https://developer.mozilla.org/ja/docs/Web/API/HTMLElement/offsetWidth#%E5%80%A4
-		const parentRect = tabHighlightEl.parentElement.getBoundingClientRect();
+		const parentRect = tabHighlightEl.value.parentElement.getBoundingClientRect();
 		const rect = tabEl.getBoundingClientRect();
-		tabHighlightEl.style.width = rect.width + 'px';
-		tabHighlightEl.style.left = (rect.left - parentRect.left + tabHighlightEl.parentElement.scrollLeft) + 'px';
+		tabHighlightEl.value.style.width = rect.width + 'px';
+		tabHighlightEl.value.style.left = (rect.left - parentRect.left + tabHighlightEl.value.parentElement.scrollLeft) + 'px';
 	}
 }
 
@@ -99,22 +99,32 @@ function onTabWheel(ev: WheelEvent) {
 	return false;
 }
 
-function enter(el: HTMLElement) {
+let entering = false;
+
+async function enter(el: HTMLElement) {
+	entering = true;
 	const elementWidth = el.getBoundingClientRect().width;
 	el.style.width = '0';
-	el.offsetWidth; // reflow
+	el.style.paddingLeft = '0';
+	el.offsetWidth; // force reflow
 	el.style.width = elementWidth + 'px';
-	setTimeout(renderTab, 70);
+	el.style.paddingLeft = '';
+	nextTick(() => {
+		entering = false;
+	});
+
+	setTimeout(renderTab, 170);
 }
 function afterEnter(el: HTMLElement) {
-	el.style.width = '';
-	nextTick(renderTab);
+	//el.style.width = '';
 }
-function leave(el: HTMLElement) {
+async function leave(el: HTMLElement) {
 	const elementWidth = el.getBoundingClientRect().width;
 	el.style.width = elementWidth + 'px';
-	el.offsetWidth; // reflow
+	el.style.paddingLeft = '';
+	el.offsetWidth; // force reflow
 	el.style.width = '0';
+	el.style.paddingLeft = '0';
 }
 function afterLeave(el: HTMLElement) {
 	el.style.width = '';
@@ -124,14 +134,17 @@ let ro2: ResizeObserver | null;
 
 onMounted(() => {
 	watch([() => props.tab, () => props.tabs], () => {
-		nextTick(() => renderTab());
+		nextTick(() => {
+			if (entering) return;
+			renderTab();
+		});
 	}, {
 		immediate: true,
 	});
 
 	if (props.rootEl) {
 		ro2 = new ResizeObserver((entries, observer) => {
-			if (document.body.contains(el as HTMLElement)) {
+			if (document.body.contains(el.value as HTMLElement)) {
 				nextTick(() => renderTab());
 			}
 		});
@@ -194,12 +207,15 @@ onUnmounted(() => {
 }
 
 .tabIcon+.tabTitle {
-	margin-left: 8px;
+	padding-left: 8px;
 }
 
 .tabTitle {
 	overflow: hidden;
-	transition: width 0.15s ease-in-out;
+
+	&.animate {
+		transition: width .15s linear, padding-left .15s linear;
+	}
 }
 
 .tabHighlight {