refactor(frontend): getBgColorを共通化 (#14782)

* refactor: getBgColor関数の切り出し + fix types (taiyme#291)

* move thing

* revert unnecesary changes

---------

Co-authored-by: taiy <53635909+taiyme@users.noreply.github.com>

1 files changed, 17 insertions, 21 deletions

diff --git a/packages/frontend/src/components/MkFolder.vue b/packages/frontend/src/components/MkFolder.vue
index 5f9500d923..7bdc06a8b4 100644
--- a/packages/frontend/src/components/MkFolder.vue
+++ b/packages/frontend/src/components/MkFolder.vue
@@ -56,8 +56,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { nextTick, onMounted, shallowRef, ref } from 'vue';
+import { nextTick, onMounted, ref, shallowRef } from 'vue';
 import { defaultStore } from '@/store.js';
+import { getBgColor } from '@/scripts/get-bg-color.js';
 
 const props = withDefaults(defineProps<{
 	defaultOpen?: boolean;
@@ -69,40 +70,35 @@ const props = withDefaults(defineProps<{
 	withSpacer: true,
 });
 
-const getBgColor = (el: HTMLElement) => {
-	const style = window.getComputedStyle(el);
-	if (style.backgroundColor && !['rgba(0, 0, 0, 0)', 'rgba(0,0,0,0)', 'transparent'].includes(style.backgroundColor)) {
-		return style.backgroundColor;
-	} else {
-		return el.parentElement ? getBgColor(el.parentElement) : 'transparent';
-	}
-};
-
 const rootEl = shallowRef<HTMLElement>();
 const bgSame = ref(false);
 const opened = ref(props.defaultOpen);
 const openedAtLeastOnce = ref(props.defaultOpen);
 
-function enter(el) {
+function enter(el: Element) {
+	if (!(el instanceof HTMLElement)) return;
 	const elementHeight = el.getBoundingClientRect().height;
-	el.style.height = 0;
+	el.style.height = '0';
 	el.offsetHeight; // reflow
-	el.style.height = Math.min(elementHeight, props.maxHeight ?? Infinity) + 'px';
+	el.style.height = `${Math.min(elementHeight, props.maxHeight ?? Infinity)}px`;
 }
 
-function afterEnter(el) {
-	el.style.height = null;
+function afterEnter(el: Element) {
+	if (!(el instanceof HTMLElement)) return;
+	el.style.height = '';
 }
 
-function leave(el) {
+function leave(el: Element) {
+	if (!(el instanceof HTMLElement)) return;
 	const elementHeight = el.getBoundingClientRect().height;
-	el.style.height = elementHeight + 'px';
+	el.style.height = `${elementHeight}px`;
 	el.offsetHeight; // reflow
-	el.style.height = 0;
+	el.style.height = '0';
 }
 
-function afterLeave(el) {
-	el.style.height = null;
+function afterLeave(el: Element) {
+	if (!(el instanceof HTMLElement)) return;
+	el.style.height = '';
 }
 
 function toggle() {
@@ -117,7 +113,7 @@ function toggle() {
 
 onMounted(() => {
 	const computedStyle = getComputedStyle(document.documentElement);
-	const parentBg = getBgColor(rootEl.value!.parentElement!);
+	const parentBg = getBgColor(rootEl.value?.parentElement) ?? 'transparent';
 	const myBg = computedStyle.getPropertyValue('--MI_THEME-panel');
 	bgSame.value = parentBg === myBg;
 });