Technical Design Document: UI Framework Choice (Qt)

1. Context and Challenges of the User Interface (UI)

The development of DaiC presents major technical challenges for the graphical interface:

• Performance: The need to display and manipulate large amounts of textual data (decompiled source code, hexadecimal) without latency.
• Modular architecture: Seamless integration with the C++ core of the application and support for a bilingual plugin system (C++ and Python).
• Responsiveness: Managing real-time collaboration and asynchronous calls to Large Language Models (LLMs).

To meet these needs, the Qt framework (in C++) was selected as the core technology for the presentation layer.

2. Technical Documentation and Architecture

The choice of Qt integrates naturally into the overall software architecture of DaiC.

2.1. Technological Consistency with the C++ Engine

Since DaiC is reverse engineering software requiring high performance (binary parsing, control flow graph manipulation), the core is written in C++. Using Qt maintains a unified C++ codebase for both the engine and the GUI (Graphical User Interface), thus avoiding the overhead associated with passing through low-level wrappers (unlike solutions such as Electron or Web UIs).

2.2. Asynchrony and Real-Time Management

For the real-time collaboration feature and asynchronous requests to LLMs, Qt offers the native Signals and Slots mechanism.
This paradigm allows for secure and efficient inter-thread communication: the thread handling the network (WebSockets for collaboration) can notify the main thread (UI) of incoming modifications in a thread-safe manner, thereby guaranteeing collaborative versioning without blocking the interface.

2.3. Scalability via the Plugin System

Qt features a native plugin architecture (QPluginLoader). This greatly facilitates the implementation of DaiC’s C++ extension system. Furthermore, through tools like PySide (or PyQt), Qt interfaces perfectly with Python, making it possible to create Python plugins capable of interacting with the application’s native graphical elements.

3. Justification of Longevity and Sustainability

The technological choice of Qt guarantees the long-term sustainability of the application for several fundamental reasons:

• Maturity and Industry Standard: Qt is a proven framework, used for over 25 years in the software industry (automotive, aerospace, development tools). It is not an “ephemeral technology” at risk of being abandoned.
• Long-Term Support (LTS): The Qt Company offers LTS versions with extended support, ensuring that DaiC will be able to receive security and stability patches for several years without requiring code rewrites.
• Portability (Cross-Platform): Although DaiC is currently developed on a specific OS, Qt-based code can be recompiled for Windows, macOS, or Linux with very few modifications. This guarantees that the software will outlast hardware and operating system evolutions.
• Independence from External Libraries: Qt embeds its own solutions for networking, thread management, and data structures, thereby reducing the number of third-party dependencies (which are often a vector for obsolescence in software projects).

4. Accessibility Considerations

Designing a tool intended for engineers and developers implies guaranteeing its usability for everyone, including professionals with disabilities (visual or motor impairments). Qt natively integrates powerful accessibility tools.

4.1. Compatibility with Assistive Technologies

The DaiC interface benefits from the Qt Accessibility module. This module bridges the application’s visual components (QWidgets) and the operating system’s native accessibility APIs (such as Microsoft Active Accessibility on Windows, or AT-SPI on Linux). This means that decompiled code and menus can be read by Screen Readers without heavy additional development.

4.2. Keyboard Navigation

For users with motor difficulties (as well as for reverse engineering “power-users”), Qt allows advanced keyboard focus management (Tab, custom shortcuts with QShortcut). All of DaiC’s features (launching the LLM, inspecting a function, committing a version) can be controlled entirely without a mouse.

4.3. Contrast and Visual Themes

The framework supports style sheets (QSS - Qt Style Sheets) and automatic adaptation to OS themes (Dark Mode / Light Mode). This allows us to offer high-contrast themes and syntax highlighting adapted (especially for different types of color blindness) for reading assembly and the C++ code generated by the LLM.