A simple document management and letter writing application

Technical Abstract

A modular document management and letter writing desktop application built with Python and Tkinter, organized into a clean, maintainable class-based architecture.

Core Features:
- Multi-format Document Export: Create and save documents as Word (.docx), PDF (.pdf), and plain text (.txt) with proper formatting
- Integrated Text Editors: Dedicated tabs for letter writing and notes with word counting, auto-save, and clipboard support
- Facts Management: 140-set data structure with Dok/Y_N/Text/NL columns for structured information
- Secure System Configuration: Password-protected settings panel with directory management and JSON import/export
- Database Backend: SQLite with background threading for responsive UI during database operations

Modular Class Structure:
- LetterManagerApp (Main): Central coordinator managing all modules and application lifecycle
- LayoutManager: UI layout controller handling notebook tabs, treeview, file lists, and search functionality
- DatabaseSchemaManager & DatabaseWorker: Database abstraction with thread-safe queue operations and schema management
- PathManager: Centralized path resolution for cross-platform directory handling
- AppLogger: Configurable logging system with debug file output and production/development modes
- Tab Managers: Specialized controllers for Facts, Letter, Notes, and System tabs with complete UI logic
- TreeviewManager: Interactive data grid with click/double-click editing for Dok/Y_N/Text/NL columns
- SecurityManager: Authentication and delete confirmation dialogs
- DataImportExportManager: JSON serialization/deserialization for records

Technical Highlights:
- Background threading for database operations to maintain UI responsiveness
- Configurable logging with separate debug file for development
- Platform-independent path handling (tested on macOS)
- Production/development mode switching for console output control
- 140-set data structure with automatic row management

In short: A complete desktop solution for creating, managing, and exporting professional documents, featuring a robust modular architecture with secure configuration, multi-format export, and an intuitive tabbed interface. Tested on macOS. A 310.29 KB Python Source Code.