From 991034115b62fdc4382942259a3de36bf73efae1 Mon Sep 17 00:00:00 2001
From: Ayaka Rizumu <464388324@qq.com>
Date: Thu, 3 Aug 2023 23:05:58 +0800
Subject: [PATCH] feat: pull down to close bottom nav sidebar (#2290)

---
 components/nav/NavBottomMoreMenu.vue | 104 ++++++++++++++++++++++++---
 1 file changed, 95 insertions(+), 9 deletions(-)

diff --git a/components/nav/NavBottomMoreMenu.vue b/components/nav/NavBottomMoreMenu.vue
index d41be688..8c99894b 100644
--- a/components/nav/NavBottomMoreMenu.vue
+++ b/components/nav/NavBottomMoreMenu.vue
@@ -1,9 +1,13 @@
 <script lang="ts" setup>
+import { invoke } from '@vueuse/core'
+
 const modelValue = defineModel<boolean>({ required: true })
 const colorMode = useColorMode()
 
 const userSettings = useUserSettings()
 
+const drawerEl = ref<HTMLDivElement>()
+
 function toggleVisible() {
   modelValue.value = !modelValue.value
 }
@@ -12,7 +16,7 @@ const buttonEl = ref<HTMLDivElement>()
 /** Close the drop-down menu if the mouse click is not on the drop-down menu button when the drop-down menu is opened */
 function clickEvent(mouse: MouseEvent) {
   if (mouse.target && !buttonEl.value?.children[0].contains(mouse.target as any)) {
-    if (modelValue) {
+    if (modelValue.value) {
       document.removeEventListener('click', clickEvent)
       modelValue.value = false
     }
@@ -23,7 +27,7 @@ function toggleDark() {
   colorMode.preference = colorMode.value === 'dark' ? 'light' : 'dark'
 }
 
-watch($$(modelValue), (val) => {
+watch(modelValue, (val) => {
   if (val && typeof document !== 'undefined')
     document.addEventListener('click', clickEvent)
 })
@@ -31,6 +35,80 @@ watch($$(modelValue), (val) => {
 onBeforeUnmount(() => {
   document.removeEventListener('click', clickEvent)
 })
+
+// Pull down to close
+const { dragging, dragDistance } = invoke(() => {
+  const triggerDistance = 120
+
+  let scrollTop = 0
+  let beforeTouchPointY = 0
+
+  const dragDistance = ref(0)
+  const dragging = ref(false)
+
+  useEventListener(drawerEl, 'scroll', (e: Event) => {
+    scrollTop = (e.target as HTMLDivElement).scrollTop
+
+    // Prevent the page from scrolling when the drawer is being dragged.
+    if (dragDistance.value > 0)
+      (e.target as HTMLDivElement).scrollTop = 0
+  }, { passive: true })
+
+  useEventListener(drawerEl, 'touchstart', (e: TouchEvent) => {
+    if (!modelValue.value)
+      return
+
+    beforeTouchPointY = e.touches[0].pageY
+    dragDistance.value = 0
+  }, { passive: true })
+
+  useEventListener(drawerEl, 'touchmove', (e: TouchEvent) => {
+    if (!modelValue.value)
+      return
+
+    // Do not move the entire drawer when its contents are not scrolled to the top.
+    if (scrollTop > 0 && dragDistance.value <= 0) {
+      dragging.value = false
+      beforeTouchPointY = e.touches[0].pageY
+      return
+    }
+
+    const { pageY } = e.touches[0]
+
+    // Calculate the drag distance.
+    dragDistance.value += pageY - beforeTouchPointY
+    if (dragDistance.value < 0)
+      dragDistance.value = 0
+    beforeTouchPointY = pageY
+
+    // Marked as dragging.
+    if (dragDistance.value > 1)
+      dragging.value = true
+
+    // Prevent the page from scrolling when the drawer is being dragged.
+    if (dragDistance.value > 0) {
+      if (e?.cancelable && e?.preventDefault)
+        e.preventDefault()
+      e?.stopPropagation()
+    }
+  }, { passive: true })
+
+  useEventListener(drawerEl, 'touchend', () => {
+    if (!modelValue.value)
+      return
+
+    if (dragDistance.value >= triggerDistance)
+      modelValue.value = false
+
+    dragging.value = false
+    // code
+  }, { passive: true })
+
+  return {
+    dragDistance,
+    dragging,
+  }
+})
 </script>
 
 <template>
@@ -39,12 +117,12 @@ onBeforeUnmount(() => {
 
     <!-- Drawer -->
     <Transition
-      enter-active-class="transition duration-250 ease-out children:(transition duration-250 ease-out)"
-      enter-from-class="opacity-0 children:(transform translate-y-full)"
-      enter-to-class="opacity-100 children:(transform translate-y-0)"
-      leave-active-class="transition duration-250 ease-in  children:(transition duration-250 ease-in)"
-      leave-from-class="opacity-100 children:(transform translate-y-0)"
-      leave-to-class="opacity-0 children:(transform translate-y-full)"
+      enter-active-class="transition duration-250 ease-out"
+      enter-from-class="opacity-0 children:(translate-y-full)"
+      enter-to-class="opacity-100 children:(translate-y-0)"
+      leave-active-class="transition duration-250 ease-in"
+      leave-from-class="opacity-100 children:(translate-y-0)"
+      leave-to-class="opacity-0 children:(translate-y-full)"
     >
       <div
         v-show="modelValue"
@@ -56,7 +134,15 @@ onBeforeUnmount(() => {
         <!-- corresponding to issue: #106, so please don't remove it. -->
         <div absolute inset-0 opacity-0 h="[calc(100vh+0.5px)]" />
         <div
-
+          ref="drawerEl"
+          :style="{
+            transform: dragging ? `translateY(${dragDistance}px)` : '',
+          }"
+          :class="{
+            'duration-0': dragging,
+            'duration-250': !dragging,
+          }"
+          transition="transform ease-in"
           flex-1 min-w-48 py-6 mb="-1px"
           of-y-auto scrollbar-hide overscroll-none max-h="[calc(100vh-200px)]"
           rounded-t-lg bg="white/85 dark:neutral-900/85" backdrop-filter backdrop-blur-md