refactor: improve toc popup module

_javascript/modules/components/toc.js

@@ -5,7 +5,10 @@ const desktopMode = matchMedia('(min-width: 1200px)');
 
 function refresh(e) {
   if (e.matches) {
-    mobile.hidePopup();
+    if (mobile.popupOpened) {
+      mobile.hidePopup();
+    }
+
     desktop.refresh();
   } else {
     mobile.refresh();

_javascript/modules/components/toc/toc-mobile.js

@@ -12,8 +12,8 @@ const SCROLL_LOCK = 'overflow-hidden';
 const CLOSING = 'closing';
 
 export class TocMobile {
-  static invisible = true;
-  static barHeight = 16 * 3; // 3rem
+  static #invisible = true;
+  static #barHeight = 16 * 3; // 3rem
 
   static options = {
     tocSelector: '#toc-popup-content',
@@ -23,7 +23,7 @@ export class TocMobile {
     orderedList: false,
     scrollSmooth: false,
     collapseDepth: 4,
-    headingsOffset: this.barHeight
+    headingsOffset: this.#barHeight
   };
 
   static initBar() {
@@ -33,44 +33,40 @@ export class TocMobile {
           $tocBar.classList.toggle('invisible', entry.isIntersecting);
         });
       },
-      { rootMargin: `-${this.barHeight}px 0px 0px 0px` }
+      { rootMargin: `-${this.#barHeight}px 0px 0px 0px` }
     );
 
     observer.observe($soloTrigger);
-    this.invisible = false;
+    this.#invisible = false;
   }
 
   static listenAnchors() {
     const $anchors = document.getElementsByClassName('toc-link');
     [...$anchors].forEach((anchor) => {
-      anchor.onclick = this.hidePopup;
+      anchor.onclick = () => this.hidePopup();
     });
   }
 
   static refresh() {
-    if (this.invisible) {
+    if (this.#invisible) {
       this.initComponents();
     }
     tocbot.refresh(this.options);
     this.listenAnchors();
   }
 
+  static get popupOpened() {
+    return $popup.open;
+  }
+
   static showPopup() {
-    TocMobile.lockScroll(true);
+    this.lockScroll(true);
     $popup.showModal();
     const activeItem = $popup.querySelector('li.is-active-li');
     activeItem.scrollIntoView({ block: 'center' });
   }
 
-  static hidePopup(event) {
-    if (event?.type === 'cancel') {
-      event.preventDefault();
-    }
-
-    if (!$popup.open) {
-      return;
-    }
-
+  static hidePopup() {
     $popup.toggleAttribute(CLOSING);
 
     $popup.addEventListener(
@@ -82,7 +78,7 @@ export class TocMobile {
       { once: true }
     );
 
-    TocMobile.lockScroll(false);
+    this.lockScroll(false);
   }
 
   static lockScroll(enable) {
@@ -91,6 +87,10 @@ export class TocMobile {
   }
 
   static clickBackdrop(event) {
+    if ($popup.hasAttribute(CLOSING)) {
+      return;
+    }
+
     const rect = event.target.getBoundingClientRect();
     if (
       event.clientX < rect.left ||
@@ -98,7 +98,7 @@ export class TocMobile {
       event.clientY < rect.top ||
       event.clientY > rect.bottom
     ) {
-      TocMobile.hidePopup();
+      this.hidePopup();
     }
   }
 
@@ -106,11 +106,15 @@ export class TocMobile {
     this.initBar();
 
     [...$triggers].forEach((trigger) => {
-      trigger.onclick = this.showPopup;
+      trigger.onclick = () => this.showPopup();
     });
 
-    $popup.onclick = this.clickBackdrop;
-    $btnClose.onclick = $popup.oncancel = this.hidePopup;
+    $popup.onclick = (e) => this.clickBackdrop(e);
+    $btnClose.onclick = () => this.hidePopup();
+    $popup.oncancel = (e) => {
+      e.preventDefault();
+      this.hidePopup();
+    };
   }
 
   static init() {

_layouts/post.html

@@ -100,7 +100,7 @@ tail_includes:
   {% if enable_toc %}
     <div id="toc-bar" class="d-flex align-items-center justify-content-between invisible">
       <span class="label text-truncate">{{ page.title }}</span>
-      <button type="button" class="toc-trigger btn btn-link me-1">
+      <button type="button" class="toc-trigger btn me-1">
         <i class="fa-solid fa-list-ul fa-fw"></i>
       </button>
     </div>
@@ -113,8 +113,8 @@ tail_includes:
     <dialog id="toc-popup" class="p-0">
       <div class="header d-flex flex-row align-items-center justify-content-between">
         <div class="label text-truncate py-2 ms-4">{{- page.title -}}</div>
-        <button id="toc-popup-close" type="button" class="btn btn-link">
-          <i class="fas fa-close fa-fw"></i>
+        <button id="toc-popup-close" type="button" class="btn mx-1 my-1 opacity-75">
+          <i class="fas fa-close"></i>
         </button>
       </div>
       <div id="toc-popup-content" class="px-4 py-3 pb-4"></div>

_sass/layout/post.scss

@@ -380,12 +380,13 @@ header {
   $slide-in: slide-in 0.3s ease-out;
   $slide-out: slide-out 0.3s ease-out;
   $curtain-height: 2rem;
+  $backdrop: blur(5px);
 
   border-color: var(--toc-popup-border-color);
   border-width: 1px;
   border-radius: $radius-lg;
   color: var(--text-color);
-  background: var(--main-bg);
+  background: var(--card-bg);
   margin-top: $topbar-height;
   min-width: 20rem;
   font-size: 1.05rem;
@@ -422,8 +423,15 @@ header {
     }
   }
 
-  button:focus-visible {
-    box-shadow: none;
+  button {
+    > i {
+      font-size: 1.25rem;
+      vertical-align: middle;
+    }
+
+    &:focus-visible {
+      box-shadow: none;
+    }
   }
 
   ul {
@@ -461,20 +469,20 @@ header {
   }
 
   &::-webkit-backdrop {
-    -webkit-backdrop-filter: blur(5px);
-    backdrop-filter: blur(5px);
+    -webkit-backdrop-filter: $backdrop;
+    backdrop-filter: $backdrop;
   }
 
   &::backdrop {
-    -webkit-backdrop-filter: blur(5px);
-    backdrop-filter: blur(5px);
+    -webkit-backdrop-filter: $backdrop;
+    backdrop-filter: $backdrop;
   }
 
   &::after {
     display: flex;
     content: '';
     position: relative;
-    background: linear-gradient(transparent, var(--main-bg) 70%);
+    background: linear-gradient(transparent, var(--card-bg) 70%);
     height: $curtain-height;
   }