API Structure Overview

The Qt API consists the following modules:

Ready-To-Use GUI Components

Application Classes

Top-level GUI classes.

Widgets

The GUI primitives like buttons, listboxes, scrollbars etc.

Dialogs

Ready-made pop-up dialogs

Geometry Management

Classes handling automatic resizing and moving of widgets

GUI Component Framework

Abstract Widgets

Abstract widget classes available for subclassing.

Drawing Classes

Classes providing drawing primitives

Font Classes

Classes related to the handling of text fonts

Kernel

Classes providing access to the low-level parts of Qt

Miscellaneous

Various other useful classes

Utilities

General Tool Classes

Generic collection classes like list, queue, stack, string etc.

I/O Handling

Classes providing OS-independent I/O and file and directory handling.

Image Handling

Digital image coding, decoding and manipulation

Time And Date Handling

OS-independent Classes for handling date and time.