itwanger · lzcGeek · Sep 10, 2026
diff --git a/docs/src/.vuepress/client.ts b/docs/src/.vuepress/client.ts
@@ -1,5 +1,6 @@
 import { defineClientConfig } from "vuepress/client";
 import DesktopSidebarToggle from "./components/DesktopSidebarToggle.vue";
+import DesktopTocToggle from "./components/DesktopTocToggle.vue";
 import FloatingControlsToggle from "./components/FloatingControlsToggle.vue";
 import FocusReadingToggle from "./components/FocusReadingToggle.vue";
 import ArticleHumanVerify from "./components/ArticleHumanVerify.vue";
@@ -8,6 +9,7 @@ import MZNXQRcodeBanner from "./components/mznxqrcode.vue";
 export default defineClientConfig({
   rootComponents: [
     DesktopSidebarToggle,
+    DesktopTocToggle,
     FocusReadingToggle,
     FloatingControlsToggle,
     ArticleHumanVerify,

diff --git a/docs/src/.vuepress/components/DesktopTocToggle.vue b/docs/src/.vuepress/components/DesktopTocToggle.vue
@@ -0,0 +1,265 @@
+<script setup lang="ts">
+import {
+  computed,
+  nextTick,
+  onBeforeUnmount,
+  onMounted,
+  ref,
+  watch,
+} from "vue";
+import { useRoute } from "vuepress/client";
+
+const STORAGE_KEY = "tobebetterjavaer-desktop-toc-collapsed";
+const COLLAPSED_CLASS = "toc-collapsed-desktop";
+const PANEL_CLASS = "toc-panel-desktop";
+const DESKTOP_BREAKPOINT = 960;
+const COLLAPSED_HANDLE_OFFSET = 20;
+
+const route = useRoute();
+
+const hasToc = ref(false);
+const isCollapsed = ref(false);
+const isDesktop = ref(false);
+const buttonStyle = ref<Record<string, string>>({});
+const lastExpandedLeft = ref<number | null>(null);
+
+let observer: MutationObserver | null = null;
+let mediaQuery: MediaQueryList | null = null;
+let removeDesktopListener: (() => void) | null = null;
+let removeResizeListener: (() => void) | null = null;
+
+const buttonTitle = computed(() =>
+  isCollapsed.value ? "展开此页内容" : "收起此页内容",
+);
+
+const getButtonTop = () => (window.innerWidth >= 1440 ? 220 : 196);
+
+const shouldShowPanel = () => isDesktop.value && hasToc.value;
+
+const shouldCollapsePanel = () => shouldShowPanel() && isCollapsed.value;
+
+const setPanelState = () => {
+  const container = document.querySelector<HTMLElement>(".theme-container");
+
+  if (!container) return;
+
+  const collapse = shouldCollapsePanel();
+
+  container.classList.toggle(COLLAPSED_CLASS, collapse);
+  // toc-panel-desktop 表示目录正占着右侧槽位，样式据此给正文预留空间
+  container.classList.toggle(PANEL_CLASS, shouldShowPanel() && !collapse);
+};
+
+const setButtonPosition = (left: number) => {
+  buttonStyle.value = {
+    left: `${left}px`,
+    top: `${getButtonTop()}px`,
+  };
+};
+
+const getCollapsedLeft = () => window.innerWidth - COLLAPSED_HANDLE_OFFSET;
+
+const getExpandedLeft = () => {
+  const toc = document.querySelector<HTMLElement>("#toc");
+
+  if (toc) {
+    const tocLeft = toc.getBoundingClientRect().left;
+
+    if (tocLeft > 0) {
+      lastExpandedLeft.value = tocLeft;
+
+      return tocLeft;
+    }
+  }
+
+  return lastExpandedLeft.value;
+};
+
+const updateButtonPosition = () => {
+  const targetLeft = shouldCollapsePanel()
+    ? getCollapsedLeft()
+    : getExpandedLeft();
+
+  if (targetLeft === null) return;
+
+  setButtonPosition(targetLeft);
+};
+
+const syncContainerState = async () => {
+  await nextTick();
+
+  const container = document.querySelector<HTMLElement>(".theme-container");
+
+  if (!container) return;
+
+  // 主题的 has-toc 在没有小标题的页面也会打上，这里以 #toc 是否真的渲染出来为准
+  hasToc.value =
+    Boolean(document.querySelector("#toc")) &&
+    !container.classList.contains("focus-reading-mode");
+
+  getExpandedLeft();
+  setPanelState();
+  updateButtonPosition();
+
+  observer?.disconnect();
+  observer?.observe(container, {
+    attributeFilter: ["class"],
+    attributes: true,
+  });
+};
+
+const toggleToc = () => {
+  const expandedLeft = getExpandedLeft();
+
+  isCollapsed.value = !isCollapsed.value;
+  localStorage.setItem(STORAGE_KEY, String(isCollapsed.value));
+  setPanelState();
+
+  // 展开后 #toc 才重新参与布局，这里重新量一次；量不到就退回收起前的缓存值
+  const targetLeft = isCollapsed.value
+    ? getCollapsedLeft()
+    : (getExpandedLeft() ?? expandedLeft);
+
+  if (targetLeft !== null) {
+    setButtonPosition(targetLeft);
+  }
+};
+
+onMounted(() => {
+  isCollapsed.value = localStorage.getItem(STORAGE_KEY) === "true";
+  mediaQuery = window.matchMedia(`(min-width: ${DESKTOP_BREAKPOINT}px)`);
+  isDesktop.value = mediaQuery.matches;
+
+  const updateDesktopState = (event: MediaQueryListEvent) => {
+    isDesktop.value = event.matches;
+  };
+
+  mediaQuery.addEventListener("change", updateDesktopState);
+  removeDesktopListener = () => {
+    mediaQuery?.removeEventListener("change", updateDesktopState);
+  };
+
+  const handleResize = () => {
+    setPanelState();
+    updateButtonPosition();
+  };
+
+  window.addEventListener("resize", handleResize);
+  removeResizeListener = () => {
+    window.removeEventListener("resize", handleResize);
+  };
+
+  observer = new MutationObserver(() => {
+    void syncContainerState();
+  });
+
+  void syncContainerState();
+});
+
+onBeforeUnmount(() => {
+  observer?.disconnect();
+  removeDesktopListener?.();
+  removeResizeListener?.();
+});
+
+watch(
+  () => route.path,
+  () => {
+    void syncContainerState();
+  },
+);
+
+watch(isDesktop, () => {
+  void syncContainerState();
+});
+</script>
+
+<template>
+  <button
+    v-if="isDesktop && hasToc"
+    :aria-label="buttonTitle"
+    :aria-pressed="isCollapsed"
+    :class="['desktop-toc-toggle', { collapsed: isCollapsed }]"
+    :style="buttonStyle"
+    :title="buttonTitle"
+    type="button"
+    @click="toggleToc"
+  >
+    <svg
+      aria-hidden="true"
+      class="desktop-toc-toggle__icon"
+      viewBox="0 0 24 24"
+    >
+      <path
+        d="M9.5 6.5 15 12l-5.5 5.5"
+        fill="none"
+        stroke="currentColor"
+        stroke-linecap="round"
+        stroke-linejoin="round"
+        stroke-width="1.8"
+      />
+    </svg>
+  </button>
+</template>
+
+<style scoped>
+.desktop-toc-toggle {
+  position: fixed;
+  z-index: 110;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 1.1rem;
+  height: 4rem;
+  padding: 0;
+  border: 1px solid rgb(203 213 225 / 42%);
+  border-radius: 999px;
+  background: rgb(255 255 255 / 76%);
+  color: rgb(100 116 139 / 78%);
+  box-shadow:
+    0 8px 20px rgb(15 23 42 / 7%),
+    0 1px 0 rgb(255 255 255 / 70%) inset;
+  backdrop-filter: blur(10px);
+  cursor: pointer;
+  transition:
+    color var(--color-transition),
+    background var(--color-transition),
+    border-color var(--color-transition),
+    box-shadow var(--color-transition),
+    left var(--transform-transition);
+  transform: translateX(-50%);
+}
+
+.desktop-toc-toggle:hover {
+  border-color: rgb(148 163 184 / 72%);
+  color: var(--theme-color);
+  background: rgb(255 255 255 / 92%);
+  box-shadow:
+    0 12px 28px rgb(15 23 42 / 10%),
+    0 1px 0 rgb(255 255 255 / 82%) inset;
+}
+
+.desktop-toc-toggle:active {
+  border-color: rgb(148 163 184 / 82%);
+  background: rgb(248 250 252 / 96%);
+  box-shadow:
+    0 6px 16px rgb(15 23 42 / 8%),
+    0 1px 0 rgb(255 255 255 / 72%) inset;
+}
+
+.desktop-toc-toggle__icon {
+  width: 0.82rem;
+  height: 0.82rem;
+  transition: transform var(--transform-transition);
+}
+
+.desktop-toc-toggle.collapsed .desktop-toc-toggle__icon {
+  transform: rotate(180deg);
+}
+
+@media (max-width: 959px) {
+  .desktop-toc-toggle {
+    display: none;
+  }
+}
+</style>
diff --git a/docs/src/.vuepress/styles/index.scss b/docs/src/.vuepress/styles/index.scss
@@ -327,6 +327,7 @@ body.focus-reading-mode {
 
 body.focus-reading-mode .vp-notice-wrapper,
 body.focus-reading-mode .desktop-sidebar-toggle,
+body.focus-reading-mode .desktop-toc-toggle,
 body.focus-reading-mode .pwa-inline-update-control,
 body.focus-reading-mode .floating-controls-toggle,
 body.focus-reading-mode .toggle-sidebar-wrapper,
@@ -1114,3 +1115,63 @@ html[data-theme="dark"] .agent-interview-page .vp-footer-wrapper {
     box-shadow: 3px 3px 0 rgb(23 33 43 / 16%);
   }
 }
+
+/* 右侧「此页内容」目录：
+   主题默认要窗口 ≥1440px 才把它放到正文右侧（hope-config.$pc），窄一点就收成正文上方的折叠条。
+   这里不新设门槛，直接复用主题已有的桌面断点（≥960px 出现左侧栏的那条线），把目录做成固定在右侧的浮窗：
+     - 目录脱离文档流，不再挤占正文，因此任何桌面宽度都能显示；
+     - 给 .vp-page 加 13.5rem 右内边距预留槽位。注意不能靠收窄 --content-width 来腾地方：
+       正文在剩余空间里是居中的，一收窄就会左右对半分，右侧反而没让出来。 */
+@media (min-width: 960px) and (max-width: 1439px) {
+  /* toc-panel-desktop 由 DesktopTocToggle 在「目录确实存在且未收起」时挂上，
+     避免没有小标题的页面白留一条空槽 */
+  .theme-container.toc-panel-desktop .vp-page {
+    padding-inline-end: 13.5rem;
+  }
+
+  .vp-toc-placeholder {
+    top: calc(var(--navbar-height) + 2rem);
+  }
+
+  #toc {
+    position: fixed;
+    top: calc(var(--navbar-height) + 2rem);
+    inset-inline-end: 0.75rem;
+    min-width: 10rem;
+    max-width: 12rem;
+    margin-bottom: 0;
+    border-radius: 0;
+    background: transparent;
+  }
+
+  .vp-toc-header {
+    padding-top: 0;
+    font-size: 0.875rem;
+  }
+
+  .vp-toc-header .arrow {
+    display: none;
+  }
+
+  .vp-toc-header .print-button {
+    display: inline-block;
+  }
+
+  .vp-toc-wrapper {
+    height: auto;
+    max-height: 75vh;
+  }
+
+  .vp-toc-marker {
+    display: block;
+  }
+
+  .vp-toc-item {
+    padding: 0 0.5rem;
+  }
+}
+
+/* 右侧目录的收起状态，由 DesktopTocToggle 切换并记忆 */
+.theme-container.toc-collapsed-desktop #toc {
+  display: none;
+}