QPropertyChangeHandler Class | Qt Core 6.4.3

- Qt 6.4
- Qt Core
- C++ Classes
- QPropertyChangeHandler
- Qt 6.4.3 Reference Documentation

# QPropertyChangeHandler Class

template <typename Functor> class QPropertyChangeHandler

The QPropertyChangeHandler class controls the lifecycle of change callback installed on a QProperty. More...

Header: | #include <QPropertyChangeHandler>
CMake: | find_package(Qt6 REQUIRED COMPONENTS Core) target_link_libraries(mytarget PRIVATE Qt6::Core)
qmake: | QT += core
Inherits: | QPropertyObserver

## Detailed Description

QPropertyChangeHandler<Functor> is created when registering a callback on a QProperty to listen to changes to the property's value, using QProperty::onValueChanged and QProperty::subscribe. As long as the change handler is alive, the callback remains installed.

A handler instance can be transferred between C++ scopes using move semantics.