QWidget is a base class for all user interface objects in Qt. It provides a set of functionalities to create custom windows, dialog boxes, etc. It also serves as a container for other widgets that together form the user interface of an application.
Some of the common functionalities provided by QWidget include:
- Handling input events such as mouse and keyboard events
- Managing widget positioning and sizing within layouts
- Drawing graphics on the widget using QPainter
- Handling focus and keyboard navigation
- Supporting drag and drop operations
All the visual elements in a Qt application are derived from QWidget or one of its subclasses. Examples of QWidget subclasses include QLabel, QPushButton, QCheckBox, QLineEdit, and many others. These classes provide specialized functionalities and can be combined to create complex user interfaces.
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