Migrate desktop_photo_search to top level (#1002)

desktop_photo_search/material/lib/src/widgets/photo_details.dart

@@ -0,0 +1,113 @@
+// Copyright 2019 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:transparent_image/transparent_image.dart';
+import 'package:url_launcher/link.dart';
+
+import '../../unsplash_access_key.dart';
+import '../unsplash/photo.dart';
+
+final _unsplashHomepage = Uri.parse(
+    'https://unsplash.com/?utm_source=$unsplashAppName&utm_medium=referral');
+
+typedef PhotoDetailsPhotoSaveCallback = void Function(Photo);
+
+class PhotoDetails extends StatefulWidget {
+  const PhotoDetails({
+    required this.photo,
+    required this.onPhotoSave,
+    Key? key,
+  }) : super(key: key);
+  final Photo photo;
+  final PhotoDetailsPhotoSaveCallback onPhotoSave;
+
+  @override
+  _PhotoDetailsState createState() => _PhotoDetailsState();
+}
+
+class _PhotoDetailsState extends State<PhotoDetails> {
+  Widget _buildPhotoAttribution(BuildContext context) {
+    return Row(
+      children: [
+        const Text('Photo by '),
+        Link(
+          uri: Uri.parse(
+              'https://unsplash.com/@${widget.photo.user!.username}?utm_source=$unsplashAppName&utm_medium=referral'),
+          builder: (context, followLink) => TextButton(
+            onPressed: followLink,
+            child: Text(widget.photo.user!.name),
+          ),
+        ),
+        const Text(' on '),
+        Link(
+          uri: _unsplashHomepage,
+          builder: (context, followLink) => TextButton(
+            onPressed: followLink,
+            child: const Text('Unsplash'),
+          ),
+        ),
+      ],
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scrollbar(
+      child: SingleChildScrollView(
+        child: Center(
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              const SizedBox(height: 16),
+              Card(
+                shape: ContinuousRectangleBorder(
+                  side: const BorderSide(color: Colors.black12),
+                  borderRadius: BorderRadius.circular(4),
+                ),
+                child: AnimatedSize(
+                  duration: const Duration(milliseconds: 750),
+                  child: Padding(
+                    padding: const EdgeInsets.fromLTRB(16, 16, 16, 40),
+                    child: ConstrainedBox(
+                      constraints: const BoxConstraints(
+                        minWidth: 400,
+                        minHeight: 400,
+                      ),
+                      child: FadeInImage.memoryNetwork(
+                        placeholder: kTransparentImage,
+                        imageSemanticLabel: widget.photo.description,
+                        image: widget.photo.urls!.small!,
+                      ),
+                    ),
+                  ),
+                ),
+              ),
+              const SizedBox(height: 8),
+              Padding(
+                padding: const EdgeInsets.only(left: 4),
+                child: Row(
+                  mainAxisAlignment: MainAxisAlignment.start,
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    _buildPhotoAttribution(context),
+                    const SizedBox(width: 8),
+                    IconButton(
+                      tooltip: 'Download',
+                      visualDensity: VisualDensity.compact,
+                      icon: const Icon(Icons.cloud_download),
+                      onPressed: () => widget.onPhotoSave(widget.photo),
+                    ),
+                  ],
+                ),
+              ),
+              const SizedBox(height: 48),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}