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# API Structure Overview

Components
Environment | Classes providing various global services to your application such as event handling, access to system settings, internationalization, etc.
Mainwindow And Friends | Everything you need for a typical modern main application window (menus, toolbars, workspace, ...)
Standard Dialogs | Ready-made dialogs for file-, font-, color-selection and more.
Basic Controls | The GUI primitives like buttons, combo-boxes, scrollbars, etc.
Advanced Controls | Advanced user interface controls like listviews, progress bars etc.
Organizers | User interface organizers like splitters, tab books, button groups, etc.
Help System | Classes providing for all forms of online-help in your application.
Framework
Object Model | The framework's underlying object model.
Abstract Widgets | Abstract widget classes available for subclassing.
Drawing And Printing | Classes providing drawing (and thus printing) primitives
Drag and Drop | Classes dealing with drag and drop and the necessary mime type encoding and decoding.
Widget Appearance | Appearance customization with styles, fonts, colors etc.
Geometry Management | Casses handling automatic resizing and moving of widgets. The Qt way of composing complex dialogs.
Utilities
General Tool Classes | Generic collection classes like list, queue, stack, string etc.
Image Processing | Digital image coding, decoding and manipulation
I/O Handling | Classes providing I/O, file and directory handling.
Time And Date | Classes for handling date and time.
Miscellaneous | Various other useful classes