star in action sheet

assets/l10n/app_en.arb

@@ -55,6 +55,14 @@
   "@actionSheetOptionQuoteAndReply":  {
     "description": "Label for Quote and reply button on action sheet."
   },
+  "actionSheetOptionStarMessage": "Star message",
+  "@actionSheetOptionStarMessage":  {
+    "description": "Label for star button on action sheet."
+  },
+  "actionSheetOptionUnstarMessage": "Unstar message",
+  "@actionSheetOptionUnstarMessage":  {
+    "description": "Label for unstar button on action sheet."
+  },
   "errorCouldNotFetchMessageSource": "Could not fetch message source",
   "@errorCouldNotFetchMessageSource": {
     "description": "Error message when the source of a message could not be fetched."
@@ -128,6 +136,14 @@
   "@errorSharingFailed": {
     "description": "Error message when sharing a message failed."
   },
+  "errorStarMessageFailedTitle": "Failed to star message",
+  "@errorStarMessageFailedTitle": {
+    "description": "Error title when starring a message failed."
+  },
+  "errorUnstarMessageFailedTitle": "Failed to unstar message",
+  "@errorUnstarMessageFailedTitle": {
+    "description": "Error title when unstarring a message failed."
+  },
   "successLinkCopied": "Link copied",
   "@successLinkCopied": {
     "description": "Success message after copy link action completed."

lib/widgets/action_sheet.dart

@@ -44,6 +44,7 @@ void showMessageActionSheet({required BuildContext context, required Message mes
           messageListContext: context,
         ),
         CopyButton(message: message, messageListContext: context),
+        StarButton(message: message, messageListContext: context),
       ]);
     });
 }
@@ -317,3 +318,50 @@ class CopyButton extends MessageActionSheetMenuItemButton {
       data: ClipboardData(text: rawContent));
   };
 }
+
+class StarButton extends MessageActionSheetMenuItemButton {
+  StarButton({
+    super.key,
+    required super.message,
+    required super.messageListContext,
+  });
+
+  @override get icon => Icons.star;
+
+  @override
+  String label(ZulipLocalizations zulipLocalizations) {
+    return message.flags.contains(MessageFlag.starred)
+      ? zulipLocalizations.actionSheetOptionUnstarMessage
+      : zulipLocalizations.actionSheetOptionStarMessage;
+  }
+
+  @override get onPressed => (BuildContext context) async {
+    Navigator.of(context).pop();
+    String? errorMessage;
+    final op = (message.flags.contains(MessageFlag.starred))
+      ? UpdateMessageFlagsOp.remove
+      : UpdateMessageFlagsOp.add;
+    try {
+      final connection = PerAccountStoreWidget.of(messageListContext).connection;
+      await updateMessageFlags(connection, messages: [message.id],
+        op: op, flag: MessageFlag.starred);
+    } catch (e) {
+      if (!messageListContext.mounted) return;
+      final zulipLocalizations = ZulipLocalizations.of(messageListContext);
+
+      switch (e) {
+        case ZulipApiException():
+          errorMessage = e.message;
+          // TODO specific messages for common errors, like network errors
+          //   (support with reusable code)
+        default:
+      }
+
+      await showErrorDialog(context: messageListContext,
+        title: switch(op) {
+          UpdateMessageFlagsOp.add    => zulipLocalizations.errorStarMessageFailedTitle,
+          UpdateMessageFlagsOp.remove => zulipLocalizations.errorUnstarMessageFailedTitle,
+        }, message: errorMessage);
+    }
+  };
+}