Add context menu for image

lib/components/image.dart

@@ -0,0 +1,26 @@
+import 'dart:typed_data';
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+import 'package:super_clipboard/super_clipboard.dart';
+import 'package:super_context_menu/super_context_menu.dart';
+
+class ImageWithContextMenu extends StatelessWidget {
+  const ImageWithContextMenu(this.data, {Key? key}) : super(key: key);
+  final Uint8List data;
+  @override
+  Widget build(BuildContext context) {
+    return ContextMenuWidget(
+        menuProvider: (_) {
+          return Menu(children: [
+            MenuAction(
+                title: AppLocalizations.of(context)!.copyImage,
+                callback: () {
+                  final item = DataWriterItem();
+                  item.add(Formats.jpeg(data));
+                  ClipboardWriter.instance.write([item]);
+                }),
+          ]);
+        },
+        child: Image.memory(data));
+  }
+}

lib/components/thumbnail.dart

@@ -6,6 +6,7 @@ import 'package:logging/logging.dart';
 import '../api/client.dart';
 import '../api/gallery.dart';
 import '../globals.dart';
+import 'image.dart';
 
 final _log = Logger("Thumbnail");
 
@@ -110,7 +111,7 @@ class _Thumbnail extends State<Thumbnail> {
                                       sigmaX: 10,
                                       sigmaY: 10,
                                       tileMode: TileMode.decal),
-                                  child: Image.memory(_data!))),
+                                  child: ImageWithContextMenu(_data!))),
                           SizedBox(
                               width: widget.width.toDouble(),
                               height: widget.height.toDouble(),
@@ -126,7 +127,7 @@ class _Thumbnail extends State<Thumbnail> {
                               ))
                         ],
                       )
-                    : Image.memory(_data!)
+                    : ImageWithContextMenu(_data!)
                 : Text("Error $_error"));
   }
 }

lib/l10n/app_en.arb

@@ -26,5 +26,6 @@
     "showNsfw": "Show NSFW image by default",
     "read": "Read",
     "download": "Download",
-    "colon": ":"
+    "colon": ":",
+    "copyImage": "Copy image to clipboard"
 }

lib/l10n/app_zh.arb

@@ -26,5 +26,6 @@
     "showNsfw": "默认显示NSFW图片",
     "read": "阅读",
     "download": "下载",
-    "colon": "："
+    "colon": "：",
+    "copyImage": "复制图片到剪贴板"
 }