Nota

Overview

Nota is a mobile application designed for efficient, offline note-taking. It solves the problem of organizing scattered thoughts by providing a robust labeling system that allows users to filter and find content instantly. Built with Flutter and backed by a local SQLite database, it ensures that users own their data and can access it without an internet connection.

Key Features

• Rich Text Editing: utilizes flutter_quill to allow users to format text (bold, italic, lists) rather than just writing plain text.
• Labeling & Filtering System: Users can create custom color-coded labels and use them to filter the note list, making organization intuitive.
• Offline Persistence: Implements sqflite to store all notes and metadata locally on the device, ensuring total privacy and zero latency.

Technical Challenge & Solution

The Challenge: The main challenge was handling Rich Text Serialization within a relational database context. The editor uses a complex JSON-based "Delta" format to represent formatting, whereas SQLite expects standard data types. Additionally, efficiently updating the UI state when filters were applied across a large list of notes required careful state management to avoid performance regressions.

The Solution:

• Data Serialization: I implemented a repository layer that serializes the Quill Delta objects into JSON strings before inserting them into the SQLite database and deserializes them back into rich text objects upon retrieval.
• State Management: I utilized the BLoC (Business Logic Component) pattern to decouple the database logic from the UI. This allowed for asynchronous database queries that update the UI state streams smoothly without blocking the main thread.

Future Improvements

• Cloud Synchronization: Adding an optional sync feature (e.g., via Firebase) to allow users to access notes across multiple devices.
• Note Sorting & Pinning: Implementing functionality to pin important notes to the top and sort lists by date or alphabetical order.