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node_modules/vitepress/dist/client/theme-default/components/VPLocalNavOutlineDropdown.vue

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+<script setup lang="ts">
+import { onKeyStroke } from '@vueuse/core'
+import { onContentUpdated } from 'vitepress'
+import { nextTick, ref, watch } from 'vue'
+import { useData } from '../composables/data'
+import { resolveTitle, type MenuItem } from '../composables/outline'
+import VPDocOutlineItem from './VPDocOutlineItem.vue'
+
+const props = defineProps<{
+  headers: MenuItem[]
+  navHeight: number
+}>()
+
+const { theme } = useData()
+const open = ref(false)
+const vh = ref(0)
+const main = ref<HTMLDivElement>()
+const items = ref<HTMLDivElement>()
+
+function closeOnClickOutside(e: Event) {
+  if (!main.value?.contains(e.target as Node)) {
+    open.value = false
+  }
+}
+
+watch(open, (value) => {
+  if (value) {
+    document.addEventListener('click', closeOnClickOutside)
+    return
+  }
+  document.removeEventListener('click', closeOnClickOutside)
+})
+
+onKeyStroke('Escape', () => {
+  open.value = false
+})
+
+onContentUpdated(() => {
+  open.value = false
+})
+
+function toggle() {
+  open.value = !open.value
+  vh.value = window.innerHeight + Math.min(window.scrollY - props.navHeight, 0)
+}
+
+function onItemClick(e: Event) {
+  if ((e.target as HTMLElement).classList.contains('outline-link')) {
+    // disable animation on hash navigation when page jumps
+    if (items.value) {
+      items.value.style.transition = 'none'
+    }
+    nextTick(() => {
+      open.value = false
+    })
+  }
+}
+
+function scrollToTop() {
+  open.value = false
+  window.scrollTo({ top: 0, left: 0, behavior: 'smooth' })
+}
+</script>
+
+<template>
+  <div
+    class="VPLocalNavOutlineDropdown"
+    :style="{ '--vp-vh': vh + 'px' }"
+    ref="main"
+  >
+    <button @click="toggle" :class="{ open }" v-if="headers.length > 0">
+      <span class="menu-text">{{ resolveTitle(theme) }}</span>
+      <span class="vpi-chevron-right icon" />
+    </button>
+    <button @click="scrollToTop" v-else>
+      {{ theme.returnToTopLabel || 'Return to top' }}
+    </button>
+    <Transition name="flyout">
+      <div v-if="open" ref="items" class="items" @click="onItemClick">
+        <div class="header">
+          <a class="top-link" href="#" @click="scrollToTop">
+            {{ theme.returnToTopLabel || 'Return to top' }}
+          </a>
+        </div>
+        <div class="outline">
+          <VPDocOutlineItem :headers="headers" />
+        </div>
+      </div>
+    </Transition>
+  </div>
+</template>
+
+<style scoped>
+.VPLocalNavOutlineDropdown {
+  padding: 12px 20px 11px;
+}
+
+@media (min-width: 960px) {
+  .VPLocalNavOutlineDropdown {
+    padding: 12px 36px 11px;
+  }
+}
+
+.VPLocalNavOutlineDropdown button {
+  display: block;
+  font-size: 12px;
+  font-weight: 500;
+  line-height: 24px;
+  color: var(--vp-c-text-2);
+  transition: color 0.5s;
+  position: relative;
+}
+
+.VPLocalNavOutlineDropdown button:hover {
+  color: var(--vp-c-text-1);
+  transition: color 0.25s;
+}
+
+.VPLocalNavOutlineDropdown button.open {
+  color: var(--vp-c-text-1);
+}
+
+.icon {
+  display: inline-block;
+  vertical-align: middle;
+  margin-left: 2px;
+  font-size: 14px;
+  transform: rotate(0)/*rtl:rotate(180deg)*/;
+  transition: transform 0.25s;
+}
+
+@media (min-width: 960px) {
+  .VPLocalNavOutlineDropdown button {
+    font-size: 14px;
+  }
+
+  .icon {
+    font-size: 16px;
+  }
+}
+
+.open > .icon {
+  /*rtl:ignore*/
+  transform: rotate(90deg);
+}
+
+.items {
+  position: absolute;
+  top: 40px;
+  right: 16px;
+  left: 16px;
+  display: grid;
+  gap: 1px;
+  border: 1px solid var(--vp-c-border);
+  border-radius: 8px;
+  background-color: var(--vp-c-gutter);
+  max-height: calc(var(--vp-vh, 100vh) - 86px);
+  overflow: hidden auto;
+  box-shadow: var(--vp-shadow-3);
+}
+
+@media (min-width: 960px) {
+  .items {
+    right: auto;
+    left: calc(var(--vp-sidebar-width) + 32px);
+    width: 320px;
+  }
+}
+
+.header {
+  background-color: var(--vp-c-bg-soft);
+}
+
+.top-link {
+  display: block;
+  padding: 0 16px;
+  line-height: 48px;
+  font-size: 14px;
+  font-weight: 500;
+  color: var(--vp-c-brand-1);
+}
+
+.outline {
+  padding: 8px 0;
+  background-color: var(--vp-c-bg-soft);
+}
+
+.flyout-enter-active {
+  transition: all 0.2s ease-out;
+}
+
+.flyout-leave-active {
+  transition: all 0.15s ease-in;
+}
+
+.flyout-enter-from,
+.flyout-leave-to {
+  opacity: 0;
+  transform: translateY(-16px);
+}
+</style>