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.