From 8d9baf8d7d120130195b18fe08edb72f73cb664f Mon Sep 17 00:00:00 2001
From: Vasilii Mikhailovskii <ti.webdev@ya.ru>
Date: Thu, 19 Dec 2024 13:48:20 +0200
Subject: [PATCH] use IntersectionObserver to show scrolling

---
 apps/frontend/auto-imports.d.ts              |  1 +
 apps/frontend/package.json                   |  1 +
 apps/frontend/src/layouts/LayoutWithTabs.vue | 44 +++++++++-----------
 apps/frontend/tailwind.config.ts             |  6 ++-
 apps/frontend/vite.config.ts                 |  4 ++
 pnpm-lock.yaml                               | 40 +++++++++++++++++-
 6 files changed, 69 insertions(+), 27 deletions(-)

diff --git a/apps/frontend/auto-imports.d.ts b/apps/frontend/auto-imports.d.ts
index e1c94d8..9ef39c5 100644
--- a/apps/frontend/auto-imports.d.ts
+++ b/apps/frontend/auto-imports.d.ts
@@ -57,6 +57,7 @@ declare global {
   const useAttrs: typeof import('vue')['useAttrs']
   const useCssModule: typeof import('vue')['useCssModule']
   const useCssVars: typeof import('vue')['useCssVars']
+  const useElementVisibility: typeof import('@vueuse/core')['useElementVisibility']
   const useHead: typeof import('unhead')['useHead']
   const useHeadSafe: typeof import('unhead')['useHeadSafe']
   const useId: typeof import('vue')['useId']
diff --git a/apps/frontend/package.json b/apps/frontend/package.json
index dc9ec1b..0ec92f0 100644
--- a/apps/frontend/package.json
+++ b/apps/frontend/package.json
@@ -25,6 +25,7 @@
     "@primevue/themes": "^4.2.1",
     "@tanstack/vue-query": "^5.60.6",
     "@unhead/vue": "^1.11.13",
+    "@vueuse/core": "^12.0.0",
     "events": "^3.3.0",
     "md5": "^2.3.0",
     "pinia": "^2.2.6",
diff --git a/apps/frontend/src/layouts/LayoutWithTabs.vue b/apps/frontend/src/layouts/LayoutWithTabs.vue
index a4384ff..0205c1e 100644
--- a/apps/frontend/src/layouts/LayoutWithTabs.vue
+++ b/apps/frontend/src/layouts/LayoutWithTabs.vue
@@ -4,25 +4,26 @@
   >
     <!-- Shadow Top -->
     <div
-      class="row-start-1 row-span-1 col-start-1 sm:row-start-2 relative w-full h-[1rem] bg-gradient-to-b from-black/30 sm:from-black/10 to-transparent dark:from-white/10 pointer-events-none transition-opacity duration-300"
-      :class="{ 'opacity-0': !showTopShadow, 'opacity-100': showTopShadow }"
+      class="transition-opacity opacity-0 row-start-1 row-span-1 col-start-1 sm:row-start-2 relative w-full h-[1rem] bg-gradient-to-b from-black/30 sm:from-black/10 to-transparent dark:from-white/10 pointer-events-none duration-300"
+      :class="{ 'opacity-100': !isTopOfContentVisible }"
     />
 
     <!-- Content Section -->
     <div
-      class="row-start-1 row-span-3 col-start-1 sm:row-start-2 overflow-hidden overflow-y-auto px-4 overscroll-contain touch-manipulation"
+      class="row-start-1 row-span-3 col-start-1 sm:row-start-2 overflow-hidden overflow-y-auto px-4 overscroll-contain touch-manipulation scrollbar scrollbar-w-1.5 scrollbar-thumb-gray-500/60 scrollbar-thumb-rounded-full"
       ref="contentScrollContainer"
-      @scroll="handleScroll"
     >
       <div class="sm:max-w-prose grid grid-cols-1 mx-auto my-5 w-full">
+        <div ref="isTopOfContentRef" />
         <slot name="default" v-bind:scrollToBottom />
+        <div ref="isBottomOfContentRef" />
       </div>
     </div>
 
     <!-- Shadow Bottom -->
     <div
-      class="row-start-3 row-span-1 col-start-1 sm:row-start-4 relative w-full h-[1rem] bg-gradient-to-t from-black/10 to-transparent dark:from-white/10 pointer-events-none transition-opacity duration-300"
-      :class="{ 'opacity-0': !showBottomShadow, 'opacity-100': showBottomShadow }"
+      class="transition-opacity opacity-0 row-start-3 row-span-1 col-start-1 sm:row-start-4 relative w-full h-[1rem] bg-gradient-to-t from-black/10 to-transparent dark:from-white/10 pointer-events-none duration-300"
+      :class="{ 'opacity-100': !isBottomOfContentVisible }"
     />
 
     <!-- Footer Section -->
@@ -52,9 +53,6 @@
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted, onBeforeUnmount } from 'vue'
-import { useTemplateRef } from 'vue'
-
 const slots = defineSlots<{
   default?: (slotBindings: { scrollToBottom: typeof scrollToBottom }) => void
   footer?: () => void
@@ -62,8 +60,18 @@ const slots = defineSlots<{
 
 const contentScrollContainerRef = useTemplateRef('contentScrollContainer')
 
-const showTopShadow = ref(false)
-const showBottomShadow = ref(false)
+const isTopOfContentRef = useTemplateRef('isTopOfContentRef')
+const isTopOfContentVisible = useElementVisibility(isTopOfContentRef, {
+  threshold: 1,
+  scrollTarget: contentScrollContainerRef,
+})
+const isBottomOfContentRef = useTemplateRef('isBottomOfContentRef')
+const isBottomOfContentVisible = useElementVisibility(isBottomOfContentRef, {
+  threshold: 1,
+  scrollTarget: contentScrollContainerRef,
+})
+isTopOfContentVisible.value = true
+isBottomOfContentVisible.value = true
 
 const scrollToBottom = () => {
   if (contentScrollContainerRef.value) {
@@ -71,17 +79,6 @@ const scrollToBottom = () => {
   }
 }
 
-const handleScroll = () => {
-  const el = contentScrollContainerRef.value
-  if (!el) return
-
-  const hasScrollTop = el.scrollTop > 0
-  const hasScrollBottom = el.scrollTop + el.clientHeight < el.scrollHeight
-
-  showTopShadow.value = hasScrollTop
-  showBottomShadow.value = hasScrollBottom
-}
-
 // Устанавливаем корректную высоту при загрузке и изменении размера окна
 const onresize = () => {
   document.documentElement.style.setProperty(
@@ -133,8 +130,7 @@ onMounted(() => {
   // visualViewport?.addEventListener('resize', onresize, { passive: true })
   contentScrollContainerRef.value!.addEventListener('touchmove', preventScroll, { passive: false })
 
-  // Инициализируем отображение теней
-  handleScroll()
+  console.log('mounted')
 })
 
 onBeforeUnmount(() => {
diff --git a/apps/frontend/tailwind.config.ts b/apps/frontend/tailwind.config.ts
index e73fed0..6b287f2 100644
--- a/apps/frontend/tailwind.config.ts
+++ b/apps/frontend/tailwind.config.ts
@@ -19,5 +19,9 @@ export default {
       },
     },
   },
-  plugins: [tailwindScrollbar, tailwindcssPrimeUI, tailwindcssSafeArea],
+  plugins: [
+    tailwindScrollbar({ nocompatible: true, preferredStrategy: 'pseudoelements' }),
+    tailwindcssPrimeUI,
+    tailwindcssSafeArea,
+  ],
 }
diff --git a/apps/frontend/vite.config.ts b/apps/frontend/vite.config.ts
index edafc33..e235d1c 100644
--- a/apps/frontend/vite.config.ts
+++ b/apps/frontend/vite.config.ts
@@ -121,6 +121,10 @@ export default defineConfig(({ mode }) => {
             from: '@tanstack/vue-query',
             imports: ['useQuery', 'useMutation'],
           },
+          {
+            from: '@vueuse/core',
+            imports: ['useElementVisibility'],
+          },
           // {
           //   from: '@hereconnect/types',
           //   type: true,
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index f8c5ec5..1efe75a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -31,6 +31,9 @@ importers:
       '@unhead/vue':
         specifier: ^1.11.13
         version: 1.11.13(vue@3.5.13(typescript@5.7.2))
+      '@vueuse/core':
+        specifier: ^12.0.0
+        version: 12.0.0(typescript@5.7.2)
       events:
         specifier: ^3.3.0
         version: 3.3.0
@@ -160,7 +163,7 @@ importers:
         version: 5.7.2
       unplugin-auto-import:
         specifier: ^0.18.6
-        version: 0.18.6(rollup@4.27.4)
+        version: 0.18.6(@vueuse/core@12.0.0(typescript@5.7.2))(rollup@4.27.4)
       unplugin-info:
         specifier: ^1.2.1
         version: 1.2.1(esbuild@0.23.1)(rollup@4.27.4)(vite@5.4.11(@types/node@20.17.9)(sass-embedded@1.82.0))
@@ -1385,6 +1388,9 @@ packages:
   '@types/tough-cookie@4.0.5':
     resolution: {integrity: sha512-/Ad8+nIOV7Rl++6f1BdKxFSMgmoqEoYbHRpPcx3JEfv8VRsQe9Z4mCXeJBzxs7mbHY/XOZZuXlRNfhpVPbs6ZA==}
 
+  '@types/web-bluetooth@0.0.20':
+    resolution: {integrity: sha512-g9gZnnXVq7gM7v3tJCWV/qw7w+KeOlSHAhgF9RytFyifW6AF61hdT2ucrYhPq9hLs5JIryeupHV3qGk95dH9ow==}
+
   '@types/web-push@3.6.4':
     resolution: {integrity: sha512-GnJmSr40H3RAnj0s34FNTcJi1hmWFV5KXugE0mYWnYhgTAHLJ/dJKAwDmvPJYMke0RplY2XE9LnM4hqSqKIjhQ==}
 
@@ -1718,6 +1724,15 @@ packages:
   '@vue/tsconfig@0.5.1':
     resolution: {integrity: sha512-VcZK7MvpjuTPx2w6blwnwZAu5/LgBUtejFOi3pPGQFXQN5Ela03FUtd2Qtg4yWGGissVL0dr6Ro1LfOFh+PCuQ==}
 
+  '@vueuse/core@12.0.0':
+    resolution: {integrity: sha512-C12RukhXiJCbx4MGhjmd/gH52TjJsc3G0E0kQj/kb19H3Nt6n1CA4DRWuTdWWcaFRdlTe0npWDS942mvacvNBw==}
+
+  '@vueuse/metadata@12.0.0':
+    resolution: {integrity: sha512-Yzimd1D3sjxTDOlF05HekU5aSGdKjxhuhRFHA7gDWLn57PRbBIh+SF5NmjhJ0WRgF3my7T8LBucyxdFJjIfRJQ==}
+
+  '@vueuse/shared@12.0.0':
+    resolution: {integrity: sha512-3i6qtcq2PIio5i/vVYidkkcgvmTjCqrf26u+Fd4LhnbBmIT6FN8y6q/GJERp8lfcB9zVEfjdV0Br0443qZuJpw==}
+
   '@xmldom/xmldom@0.9.6':
     resolution: {integrity: sha512-Su4xcxR0CPGwlDHNmVP09fqET9YxbyDXHaSob6JlBH7L6reTYaeim6zbk9o08UarO0L5GTRo3uzl0D+9lSxmvw==}
     engines: {node: '>=14.6'}
@@ -4917,6 +4932,8 @@ snapshots:
 
   '@types/tough-cookie@4.0.5': {}
 
+  '@types/web-bluetooth@0.0.20': {}
+
   '@types/web-push@3.6.4':
     dependencies:
       '@types/node': 22.10.2
@@ -5465,6 +5482,23 @@ snapshots:
 
   '@vue/tsconfig@0.5.1': {}
 
+  '@vueuse/core@12.0.0(typescript@5.7.2)':
+    dependencies:
+      '@types/web-bluetooth': 0.0.20
+      '@vueuse/metadata': 12.0.0
+      '@vueuse/shared': 12.0.0(typescript@5.7.2)
+      vue: 3.5.13(typescript@5.7.2)
+    transitivePeerDependencies:
+      - typescript
+
+  '@vueuse/metadata@12.0.0': {}
+
+  '@vueuse/shared@12.0.0(typescript@5.7.2)':
+    dependencies:
+      vue: 3.5.13(typescript@5.7.2)
+    transitivePeerDependencies:
+      - typescript
+
   '@xmldom/xmldom@0.9.6': {}
 
   abbrev@1.1.1: {}
@@ -7635,7 +7669,7 @@ snapshots:
 
   universalify@2.0.1: {}
 
-  unplugin-auto-import@0.18.6(rollup@4.27.4):
+  unplugin-auto-import@0.18.6(@vueuse/core@12.0.0(typescript@5.7.2))(rollup@4.27.4):
     dependencies:
       '@antfu/utils': 0.7.10
       '@rollup/pluginutils': 5.1.3(rollup@4.27.4)
@@ -7645,6 +7679,8 @@ snapshots:
       minimatch: 9.0.5
       unimport: 3.14.2(rollup@4.27.4)
       unplugin: 1.16.0
+    optionalDependencies:
+      '@vueuse/core': 12.0.0(typescript@5.7.2)
     transitivePeerDependencies:
       - rollup