All Qt widgets inherit QObject. The convenience function isWidgetType () returns whether an object is actually a widget. It is much faster than qobject_cast <QWidget *> (obj) or obj -> …

As described in the introduction, the QObject is what enables many of Qt's core functions such as signals and slots. This is implemented through introspection, which is what QObject provides. QObject is the base class of almost all classes in Qt. Exceptions are value types such as QColor, QString and QList.

Qt's meta-object system provides the signals and slots mechanism for inter-object communication, run-time type information, and the dynamic property system. The meta-object system is based on three things: The QObject class provides a base class for objects that can take advantage of the meta-object system.

May 16, 2017 · Could someone explain in as simple terms as possible (or as simple as you would like) what qobject_cast is, what it does and why we would need to cast one class type to another?

The thread in which a QObject lives is available using QObject::thread (). The QObject::moveToThread () function changes the thread affinity for an object and its children (the object cannot be moved if it has a parent).

QObject is the base class for almost every Qt provided classes. As long as a class inherits from QObject, it can have signals and/or slots, and can be used with the connection mechanism.

Apr 27, 2024 · QObject是一个类，是QT所有类的父类。 QObject作为QT中比较核心的基类，其作用是非常大的，并且其的属性成员函数能实现的功能也是非常多，非常复杂的。

Detailed Description The QObject class is the base class of all Qt objects. QObject is the heart of the Qt object model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect () and destroy the connection with disconnect ().

[invokable] QObject::QObject (QObject * parent = nullptr) Constructs an object with parent object parent. The parent of an object may be viewed as the object's owner. For instance, a dialog box is the parent of the OK and Cancel buttons it contains. The …

All classes that inherit from QObject or one of its subclasses (e.g., QWidget) can contain signals and slots. Signals are emitted by objects when they change their state in a way that may be interesting to other objects.