action_sheet: Add "Copy to clipboard" button

Fixes: #132

Author: chrisbobbe

lib/widgets/action_sheet.dart

@@ -1,9 +1,11 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:share_plus/share_plus.dart';
 
 import '../api/exception.dart';
 import '../api/model/model.dart';
 import '../api/route/messages.dart';
+import 'clipboard.dart';
 import 'compose_box.dart';
 import 'dialog.dart';
 import 'draggable_scrollable_modal_bottom_sheet.dart';
@@ -28,6 +30,7 @@ void showMessageActionSheet({required BuildContext context, required Message mes
           message: message,
           messageListContext: context,
         ),
+        CopyButton(message: message, messageListContext: context),
       ]);
     });
 }
@@ -190,3 +193,36 @@ class QuoteAndReplyButton extends MessageActionSheetMenuItemButton {
     }
   };
 }
+
+class CopyButton extends MessageActionSheetMenuItemButton {
+  CopyButton({
+    super.key,
+    required super.message,
+    required super.messageListContext,
+  });
+
+  @override get icon => Icons.copy;
+
+  @override get label => 'Copy message text';
+
+  @override get onPressed => (BuildContext context) async {
+    // Close the message action sheet. We won't be showing request progress,
+    // but hopefully it won't take long at all, and
+    // fetchRawContentWithFeedback has a TODO for giving feedback if it does.
+    Navigator.of(context).pop();
+
+    final rawContent = await fetchRawContentWithFeedback(
+      context: messageListContext,
+      messageId: message.id,
+      errorDialogTitle: 'Copying failed',
+    );
+
+    if (rawContent == null) return;
+
+    if (!messageListContext.mounted) return;
+
+    // TODO(i18n)
+    copyWithPopup(context: context, successContent: const Text('Message copied'),
+      data: ClipboardData(text: rawContent));
+  };
+}

test/widgets/action_sheet_test.dart

@@ -1,5 +1,6 @@
 import 'package:checks/checks.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:zulip/api/model/model.dart';
 import 'package:zulip/api/route/messages.dart';
@@ -16,6 +17,7 @@ import '../example_data.dart' as eg;
 import '../flutter_checks.dart';
 import '../model/binding.dart';
 import '../model/test_store.dart';
+import '../test_clipboard.dart';
 import 'compose_box_checks.dart';
 import 'dialog_checks.dart';
 
@@ -220,4 +222,48 @@ void main() {
       check(findQuoteAndReplyButton(tester)).isNull();
     });
   });
+
+  group('CopyButton', () {
+    setUp(() async {
+      TestZulipBinding.ensureInitialized();
+      TestWidgetsFlutterBinding.ensureInitialized();
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
+        SystemChannels.platform,
+        MockClipboard().handleMethodCall,
+      );
+    });
+
+    tearDown(() async {
+      TestZulipBinding.instance.reset();
+    });
+
+    testWidgets('success', (WidgetTester tester) async {
+      final message = eg.streamMessage();
+      await setupToMessageActionSheet(tester, message: message, narrow: TopicNarrow.ofMessage(message));
+      final store = await TestZulipBinding.instance.globalStore.perAccount(eg.selfAccount.id);
+
+      await tester.ensureVisible(find.byIcon(Icons.copy, skipOffstage: false));
+      prepareRawContentResponseSuccess(store, message: message, rawContent: 'Hello world');
+      await tester.tap(find.byIcon(Icons.copy));
+      await tester.pump(Duration.zero);
+      check(await Clipboard.getData('text/plain')).isNotNull().text.equals('Hello world');
+    });
+
+    testWidgets('request has an error', (WidgetTester tester) async {
+      final message = eg.streamMessage();
+      await setupToMessageActionSheet(tester, message: message, narrow: TopicNarrow.ofMessage(message));
+      final store = await TestZulipBinding.instance.globalStore.perAccount(eg.selfAccount.id);
+
+      await tester.ensureVisible(find.byIcon(Icons.copy, skipOffstage: false));
+      prepareRawContentResponseError(store);
+      await tester.tap(find.byIcon(Icons.copy));
+      await tester.pump(Duration.zero); // error arrives; error dialog shows
+
+      await tester.tap(find.byWidget(checkErrorDialog(tester,
+        expectedTitle: 'Copying failed',
+        expectedMessage: 'That message does not seem to exist.',
+      )));
+      check(await Clipboard.getData('text/plain')).isNull();
+    });
+  });
 }