Qt basic modulesΒΆ

Qt library includes more than 500 classes, which cover the most part of OS functionality. But no worries, you don’t have remeber them all. Due to nice modulariztion you only need to have an idea in mind of which module can include functionality you need, and then go through module classes list in search of a relevant class.

Any Qt based program must include one or few of following modules: QtCore, QtGui, QtWidgets, QtQuick, QtQML.

Note

Some of modules above will only work in combination with others. For instance, QtQuick is used along with QtQML module.

In the previous excersise you got in touch with some Qt classes, namely QApplication and QLabel. Let’s now list Qt basic C++ modules and specify the example classes those modules include:

Module
Declaration
in .pro
 Description and classes included
QtCore core

Set of basic classes not related to GUI

  • containers: QList, QVector, QMap, QVariant
  • io classes: QIODevice, QFile
  • timers: QTimer
  • date and time: QDate, QTime
  • events: QEvent
  • settings: QSettings
  • animation: QAbstractAnimation
  • QCoreAppication
  • QObject, a corner stone of any Qt class
  • multi-threading/processing: QThread, QProcess
QtGui gui

Set of classes for window system integration, OpenGL integration, pallette and cursor shape handling, etc.

  • QWindow
  • QGuiApplication, inherits QCoreApplication
QtWidgets widgets

Includes widget classes, building blocks for GUI

  • QWidget, the basic class for any widget
  • indication: QLabel, QLCDNumber
  • layout: QHBoxLayout, QVBoxLayout
  • buttons: QPushButton, QCheckButton
  • scrolls: QSlider, QScrollBar
  • input: QLineEdit, QSpinBox
  • pics: QImage, QPixmap
  • painting: QPainter, QBrush, QPen