From f9ba35d92882103702b9c33c5f0d1bbf98fc029f Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Sat, 2 Jul 2022 21:28:55 +0900
Subject: [PATCH] enhance(client): better sticky-container component

---
 .../src/components/global/page-header.vue     |  3 --
 .../components/global/sticky-container.vue    | 52 +++++++++----------
 packages/client/src/pages/admin/_header_.vue  |  3 --
 3 files changed, 24 insertions(+), 34 deletions(-)

diff --git a/packages/client/src/components/global/page-header.vue b/packages/client/src/components/global/page-header.vue
index 5395a87961..0ab15e0ca3 100644
--- a/packages/client/src/components/global/page-header.vue
+++ b/packages/client/src/components/global/page-header.vue
@@ -174,9 +174,6 @@ onUnmounted(() => {
 .fdidabkb {
 	--height: 60px;
 	display: flex;
-	position: sticky;
-	top: var(--stickyTop, 0);
-	z-index: 1000;
 	width: 100%;
 	-webkit-backdrop-filter: var(--blur, blur(15px));
 	backdrop-filter: var(--blur, blur(15px));
diff --git a/packages/client/src/components/global/sticky-container.vue b/packages/client/src/components/global/sticky-container.vue
index 98a7ee9c30..2603fac55d 100644
--- a/packages/client/src/components/global/sticky-container.vue
+++ b/packages/client/src/components/global/sticky-container.vue
@@ -1,6 +1,8 @@
 <template>
 <div ref="rootEl">
-	<slot name="header"></slot>
+	<div ref="headerEl">
+		<slot name="header"></slot>
+	</div>
 	<div ref="bodyEl" :data-sticky-container-header-height="headerHeight">
 		<slot></slot>
 	</div>
@@ -8,39 +10,25 @@
 </template>
 
 <script lang="ts" setup>
-import { onMounted, onUnmounted } from 'vue';
+import { onMounted, onUnmounted, provide, inject, Ref, ref, watch } from 'vue';
 
-const props = withDefaults(defineProps<{
-	autoSticky?: boolean;
-}>(), {
-	autoSticky: false,
-});
+const CURRENT_STICKY_TOP = Symbol('CURRENT_STICKY_TOP');
 
 const rootEl = $ref<HTMLElement>();
+const headerEl = $ref<HTMLElement>();
 const bodyEl = $ref<HTMLElement>();
 
 let headerHeight = $ref<string | undefined>();
+let childStickyTop = $ref(0);
+const parentStickyTop = inject<Ref<number>>(CURRENT_STICKY_TOP, ref(0));
+provide(CURRENT_STICKY_TOP, $$(childStickyTop));
 
 const calc = () => {
-	const currentStickyTop = getComputedStyle(rootEl).getPropertyValue('--stickyTop') || '0px';
-
-	const header = rootEl.children[0] as HTMLElement;
-	if (header === bodyEl) {
-		bodyEl.style.setProperty('--stickyTop', currentStickyTop);
-	} else {
-		bodyEl.style.setProperty('--stickyTop', `calc(${currentStickyTop} + ${header.offsetHeight}px)`);
-		headerHeight = header.offsetHeight.toString();
-
-		if (props.autoSticky) {
-			header.style.setProperty('--stickyTop', currentStickyTop);
-			header.style.position = 'sticky';
-			header.style.top = 'var(--stickyTop)';
-			header.style.zIndex = '1';
-		}
-	}
+	childStickyTop = parentStickyTop.value + headerEl.offsetHeight;
+	headerHeight = headerEl.offsetHeight.toString();
 };
 
-const observer = new MutationObserver(() => {
+const observer = new ResizeObserver(() => {
 	window.setTimeout(() => {
 		calc();
 	}, 100);
@@ -49,11 +37,19 @@ const observer = new MutationObserver(() => {
 onMounted(() => {
 	calc();
 
-	observer.observe(rootEl, {
-		attributes: false,
-		childList: true,
-		subtree: false,
+	watch(parentStickyTop, calc);
+
+	watch($$(childStickyTop), () => {
+		bodyEl.style.setProperty('--stickyTop', `${childStickyTop}px`);
+	}, {
+		immediate: true,
 	});
+
+	headerEl.style.position = 'sticky';
+	headerEl.style.top = 'var(--stickyTop, 0)';
+	headerEl.style.zIndex = '1000';
+
+	observer.observe(headerEl);
 });
 
 onUnmounted(() => {
diff --git a/packages/client/src/pages/admin/_header_.vue b/packages/client/src/pages/admin/_header_.vue
index 1c3cdcb51f..73747e1164 100644
--- a/packages/client/src/pages/admin/_header_.vue
+++ b/packages/client/src/pages/admin/_header_.vue
@@ -152,9 +152,6 @@ onUnmounted(() => {
 .fdidabkc {
 	--height: 60px;
 	display: flex;
-	position: sticky;
-	top: var(--stickyTop, 0);
-	z-index: 1000;
 	width: 100%;
 	-webkit-backdrop-filter: var(--blur, blur(15px));
 	backdrop-filter: var(--blur, blur(15px));