Make sticky card functional

frontend/components/product/ProductVideo.vue

@@ -1,10 +1,27 @@
 <script lang="ts" setup>
-
 // import
 
 import useGetProduct from "~/composables/api/product/useGetProduct";
 import type { ProductVariantProvideType } from "~/pages/product/[id].vue";
 
+// types
+
+type Props = {
+    showChatButton: boolean;
+};
+
+// props
+
+defineProps<Props>();
+
+// emits
+
+const emit = defineEmits(["update:showChatButton"]);
+
+// provide / inject
+
+const { selectedVariant } = inject("productVariant") as ProductVariantProvideType;
+
 // state
 
 const route = useRoute();
@@ -12,12 +29,32 @@ const id = route.params.id as string | undefined;
 
 const { data: product } = useGetProduct(id);
 
-const { selectedVariant } = inject("productVariant") as ProductVariantProvideType;
+const videoSectionEl = useTemplateRef<HTMLDivElement>("videoSectionEl");
 
+const { bottom: videoSectionBottomBounding, height: videoSectionHeightBounding } = useElementBounding(videoSectionEl);
+const isVideoSectionVisible = useElementVisibility(videoSectionEl, {
+    rootMargin: "0px 0px -20% 0px",
+});
+
+// computed
+
+const isVideoSectionHittingBottom = computed(() => {
+    return videoSectionBottomBounding.value < videoSectionHeightBounding.value - 100;
+});
+
+// watch
+
+watch([isVideoSectionVisible, isVideoSectionHittingBottom], ([isVideoSectionVisible, isVideoSectionHittingBottom]) => {
+    emit("update:showChatButton", !(isVideoSectionVisible && !isVideoSectionHittingBottom));
+});
 </script>
 
 <template>
-    <section v-if="selectedVariant?.video" class="h-[110svh] w-full relative bg-black mt-[5rem]">
+    <section
+        v-if="selectedVariant?.video"
+        ref="videoSectionEl"
+        class="h-[110svh] w-full relative bg-black mt-[5rem]"
+    >
         <video
             :src="selectedVariant.video"
             class="object-cover absolute size-full"
@@ -28,14 +65,22 @@ const { selectedVariant } = inject("productVariant") as ProductVariantProvideTyp
             loop
         />
         <div class="size-full absolute inset-0 bg-black/20" />
-        <div class="absolute max-sm:flex items-center justify-center max-sm:px-5 sm:right-10 bottom-10 w-full">
-            <StickyCard
-                :color="selectedVariant.color!"
-                :price="selectedVariant.price"
-                :picture="selectedVariant.images[0].image"
-                :title="product!.name"
-                class="max-sm:!w-full"
-            />
-        </div>
+        <Transition
+            name="fade"
+            :duration="150"
+        >
+            <div
+                v-if="isVideoSectionVisible && !isVideoSectionHittingBottom"
+                class="fixed max-sm:flex max-sm:w-full items-center justify-center max-sm:px-5 sm:right-10 bottom-10 h-fit w-fit"
+            >
+                <StickyCard
+                    :color="selectedVariant.color!"
+                    :price="selectedVariant.price"
+                    :picture="selectedVariant.images[0].image"
+                    :title="product!.name"
+                    class="max-sm:!w-full"
+                />
+            </div>
+        </Transition>
     </section>
 </template>