From eb8584a31e5bb555258fe824a82e7fcb41324bbc Mon Sep 17 00:00:00 2001
From: Florent Delerue <flo@nuxtjs.com>
Date: Tue, 22 Jun 2021 15:56:59 +0200
Subject: [PATCH] feat: home discover animation (#463)
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* :construction: (HomeDiscover) lottie animation

* :fire: (lottie) remove json

* fix: lottie ref

* :sparkles: (HomeDiscover) anim

* :recycle: (HomeDiscover) replace the 5 animations in one and add segments

* :sparkles: (HomeDiscover) update json lottie path

* :sparkles: (HomeDiscover) play/pause animation on scoll

* :sparkles: (HomeDiscover) anim according color mode

* :sparkles: (HomeDiscover) change threshold for anim visibility

* :bug: (HomeDiscover) add any type on useContext to avoid lint error

* :recycle: (HomeDiscover) change layout anim size

Co-authored-by: Farnabaz <farnabaz@gmail.com>
Co-authored-by: Yaël GUILLOUX <yael.guilloux@gmail.com>
---
 nuxtjs.org/components/HomeDiscover.vue        | 203 ++++++++++++++----
 .../static/img/home/discover/diamond.svg      |   1 +
 package.json                                  |   1 +
 yarn.lock                                     |   5 +
 4 files changed, 172 insertions(+), 38 deletions(-)
 create mode 100644 nuxtjs.org/static/img/home/discover/diamond.svg

diff --git a/nuxtjs.org/components/HomeDiscover.vue b/nuxtjs.org/components/HomeDiscover.vue
index 59f794202..74e4d932f 100644
--- a/nuxtjs.org/components/HomeDiscover.vue
+++ b/nuxtjs.org/components/HomeDiscover.vue
@@ -13,9 +13,9 @@
       alt="A landscape image"
     />
 
-    <HomeSection class="py-20 light:bg-gray-50 dark:bg-secondary-darkest">
+    <HomeSection class="pt-40 light:bg-gray-50 dark:bg-secondary-darkest">
       <template #section-content>
-        <SectionContent class="col-span-6 items-center md:items-start justify-center">
+        <SectionContent class="col-span-12 justify-center">
           <template #category>
             <CategoryLabel :label="category" />
           </template>
@@ -37,32 +37,53 @@
           </template>
 
           <template #paragraph>
-            <p class="pt-2 pb-8 text-center md:text-left font-normal text-body-base md:text-body-lg 2xl:text-body-xl">
-              <Markdown slot="description" unwrap="p" />
-            </p>
-            <div class="flex justify-center md:justify-start">
-              <SectionButton
-                :to="primary.url"
-                :aria-label="primary.text"
-                size="md"
-                class="bg-primary-green text-gray-800 hover:bg-green-300 focus:bg-green-300"
-                :icon-left="primary.icon"
-              >
-                {{ primary.text }}
-              </SectionButton>
-            </div>
+            <SectionDescription class="py-4 w-full" size="md">
+              Nuxt is an Open Source web framework based on official Vue.js libraries, Node.js and using powerful
+              development tools such as Vite, Webpack, Babel and PostCSS. Nuxt's purpose is to make web application
+              development intuitive and performant with a great developer experience in mind.
+            </SectionDescription>
           </template>
         </SectionContent>
       </template>
-
       <template #right-illustration>
-        <div class="col-span-6 w-full flex justify-center items-center md:justify-end">
-          <img
-            class="sm:w-3/5 md:w-3/4 lg:w-4/6 xl:w-3/5"
-            loading="lazy"
-            src="~/static/img/home/discover/modules/discover-modules.svg"
-            alt="Image of a simplified diagram of how Nuxt works"
-          />
+        <div class="col-span-12">
+          <div class="flex flex-col md:flex-row justify-center items-center">
+            <div
+              class="
+                grid grid-cols-3
+                gap-8
+                md:gap-0 md:flex md:flex-col
+                items-center
+                md:items-start
+                space-x-4
+                md:space-x-0 md:space-y-2 md:w-2/5
+                xl:w-1/5
+              "
+            >
+              <div v-for="(animation, index) in animations" :key="animation.name">
+                <div class="flex flex-col-reverse md:flex-row md:flex-row justify-center items-center space-x-2">
+                  <img
+                    :src="`/img/home/discover/diamond.svg`"
+                    alt="diamond"
+                    class="h-4 w-4 opacity-0"
+                    :class="{ 'opacity-100': index === currentIndex }"
+                  />
+                  <button
+                    class="font-semibold"
+                    :class="
+                      index === currentIndex ? 'text-gray-700 dark:text-white' : 'text-gray-400 dark:text-gray-400'
+                    "
+                    @click="changeAnimation(index)"
+                  >
+                    {{ animation.name }}
+                  </button>
+                </div>
+              </div>
+            </div>
+            <div class="anim">
+              <div ref="lottieAnim" class="h-96" />
+            </div>
+          </div>
         </div>
       </template>
     </HomeSection>
@@ -81,22 +102,128 @@
     />
   </div>
 </template>
+<script lang="ts">
+import { defineComponent, ref, onMounted, watch, useContext, computed } from '@nuxtjs/composition-api'
+import lottie, { AnimationItem, AnimationSegment } from 'lottie-web'
+export default defineComponent({
+  setup(_props, context) {
+    const { $colorMode } = useContext() as any
+    const lottieAnimPathLight = 'https://assets10.lottiefiles.com/private_files/lf30_8cv6lgcx.json'
+    const lottieAnimPathDark = 'https://assets10.lottiefiles.com/private_files/lf30_obsnpogu.json'
+    const animations = ref([
+      {
+        name: 'Pages',
+        segment: [1, 238] as AnimationSegment
+      },
+      {
+        name: 'UI',
+        segment: [238, 448] as AnimationSegment
+      },
+      {
+        name: 'Data',
+        segment: [447, 688] as AnimationSegment
+      },
+      {
+        name: 'Modules',
+        segment: [688, 928] as AnimationSegment
+      },
+      {
+        name: 'Deployment',
+        segment: [928, 1167] as AnimationSegment
+      }
+    ])
+    const lottieAnim = ref(null)
+    const currentIndex = ref(0)
+    const animFrames = ref([0, 238, 448, 688, 928])
+    let anim: AnimationItem
+
+    /* computed */
+    const colorMode = computed(() => {
+      return $colorMode.value
+    })
 
-<script>
-export default {
-  props: {
-    category: {
-      type: String,
-      default: 'Category'
-    },
-    primary: {
-      type: Object,
-      default: () => ({
-        text: 'Get started',
-        url: '/get-started',
-        icon: 'IconPlay'
+    /* function */
+    // if user clicks on section, stop loop and play specified segment
+    function changeAnimation(index: number) {
+      currentIndex.value = index
+      anim.loop = false
+      anim.playSegments(animations.value[index].segment, true)
+    }
+
+    function loadAnimation() {
+      anim?.destroy()
+      /**
+       * Temporary use `context.ref` this should replace by Vue3 ref
+       */
+      lottieAnim.value = context.refs.lottieAnim as Element
+
+      anim = lottie.loadAnimation({
+        container: lottieAnim.value,
+        renderer: 'svg',
+        loop: true,
+        autoplay: false,
+        path: colorMode.value === 'dark' ? lottieAnimPathDark : lottieAnimPathLight
       })
+
+      anim.addEventListener('DOMLoaded', function () {
+        // play animation when lottie container is visible otherwise pause it
+        animationObserver()
+      })
+
+      anim.addEventListener('enterFrame', function () {
+        const currentIndexFrame = animFrames.value.indexOf(Math.round(anim.currentFrame))
+
+        if (currentIndexFrame !== -1 && anim.loop === true) {
+          currentIndex.value = currentIndexFrame
+        }
+      })
+
+      anim.addEventListener('loopComplete', function () {
+        currentIndex.value = 0
+      })
+    }
+
+    function animationObserver() {
+      const callback = entries => {
+        entries.forEach(({ _, isIntersecting }) => {
+          if (!isIntersecting) {
+            anim.pause()
+          } else {
+            anim.play()
+          }
+        })
+      }
+
+      const observer = new IntersectionObserver(callback, {
+        root: document.querySelector('anim'),
+        threshold: 0.8 // isIntersecting when 80% of container is visible
+      })
+
+      observer.observe(lottieAnim.value)
+    }
+
+    /* watcher */
+    // reload anim with new path according color mode
+    watch(colorMode, (_, __) => {
+      loadAnimation()
+    })
+
+    onMounted(() => setTimeout(loadAnimation, 250))
+
+    return {
+      lottieAnim,
+      anim,
+      loadAnimation,
+      changeAnimation,
+      animations,
+      currentIndex,
+      animationObserver
     }
   }
-}
+})
 </script>
+<style lang="postcss" scoped>
+.anim {
+  @apply w-full flex justify-center items-center md:justify-end w-full;
+}
+</style>
diff --git a/nuxtjs.org/static/img/home/discover/diamond.svg b/nuxtjs.org/static/img/home/discover/diamond.svg
new file mode 100644
index 000000000..40b9b81c5
--- /dev/null
+++ b/nuxtjs.org/static/img/home/discover/diamond.svg
@@ -0,0 +1 @@
+<svg width="16" height="16" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M8 1l4.33 7H3.67L8 1zM8 15L3.67 8h8.66L8 15z" fill="#00DC82"/></svg>
diff --git a/package.json b/package.json
index a7106d4fa..e29d8a45a 100755
--- a/package.json
+++ b/package.json
@@ -74,6 +74,7 @@
     "hasha": "^5.2.2",
     "hookable": "^4.4.1",
     "jiti": "^1.10.1",
+    "lottie-web": "^5.7.11",
     "mande": "^1.0.0",
     "marked": "^2.0.7",
     "mkdirp": "^1.0.4",
diff --git a/yarn.lock b/yarn.lock
index 31a79dcfc..78ffd0ef7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -8284,6 +8284,11 @@ loose-envify@^1.0.0:
   dependencies:
     js-tokens "^3.0.0 || ^4.0.0"
 
+lottie-web@^5.7.11:
+  version "5.7.11"
+  resolved "https://registry.yarnpkg.com/lottie-web/-/lottie-web-5.7.11.tgz#4ba74e8a629f76d3c0a0062ddc37d2b96e13765c"
+  integrity sha512-Jvz3PQqwrDj1rXGqfeQtipH/WNtM/Y4l8t8NIQXe1xUI0nVooH2bTYJGef0UkdBcWUx1s3miKsRhyP196g9tvQ==
+
 loud-rejection@^1.0.0:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/loud-rejection/-/loud-rejection-1.6.0.tgz#5b46f80147edee578870f086d04821cf998e551f"