added a cool header bar with hero image transition thingy to the listing view

lib/pages/view_listing.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:transparent_image/transparent_image.dart';
 
 class RouteViewListing extends StatefulWidget {
   @override
@@ -10,16 +11,39 @@ class _RouteViewListingState extends State<RouteViewListing> {
   Widget build(BuildContext context) {
     final String id = ModalRoute.of(context).settings.arguments;
     return Scaffold(
-      appBar: AppBar(
-        title: Text("View listing"),
-        automaticallyImplyLeading: false, // remove the useless back button
-      ),
-      body: ListView(
-        children: [
-          ListTile(
-            title: Text("ID: $id")
-          )
-        ]
+      body: NestedScrollView(
+        headerSliverBuilder: (context, innerBoxIsScrolled) => [
+          SliverOverlapAbsorber(
+            sliver: SliverSafeArea(
+              top: false,
+              sliver: SliverAppBar(
+                title: Text("View listing"),
+                pinned: true,
+                flexibleSpace: FadeInImage.memoryNetwork(
+                  placeholder: kTransparentImage,
+                  image: 'https://lynnesbian.space/res/ceres/lesbun_full.jpg',
+                  fit: BoxFit.cover,
+                ),
+                expandedHeight: 200,
+                automaticallyImplyLeading: false, // remove the useless back button
+              ),
+            ),
+            handle: NestedScrollView.sliverOverlapAbsorberHandleFor(context),
+          ),
+        ],
+        body: ListView(
+          children: [
+            ListTile(
+              title: Text("ID"),
+              trailing: Text(id),
+            ),
+            Divider(),
+            ListTile(
+              title: Text("Price"),
+              trailing: Text("¥12345")
+            )
+          ],
+        )
       )
     );
   }

pubspec.lock

@@ -177,6 +177,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.2.17"
+  transparent_image:
+    dependency: "direct main"
+    description:
+      name: transparent_image
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
   typed_data:
     dependency: transitive
     description:

pubspec.yaml

@@ -31,6 +31,7 @@ dependencies:
   sprintf: "^4.0.0"
   provider: ^4.1.0
   sqflite: ^1.3.0
+  transparent_image: ^1.0.0
 
 dev_dependencies:
   flutter_test: