qt changeEvent

The `changeEvent` function in Qt is an event handler that is called when there is a change in the widget's state. It is used to handle various types of events such as resize, move, and paint events.

Here is an example of how to implement the `changeEvent` function in a Qt widget:

void MyWidget::changeEvent(QEvent* event)
{
    if (event->type() == QEvent::WindowStateChange) {
        // Handle window state change event
        // ...
    }
    else if (event->type() == QEvent::Resize) {
        // Handle resize event
        // ...
    }
    else if (event->type() == QEvent::Move) {
        // Handle move event
        // ...
    }

    // Call the base class implementation
    QWidget::changeEvent(event);
}

In this example, we check the type of the event using `event->type()` and perform different actions based on the event type. Remember to call the base class implementation of `changeEvent` at the end to ensure proper handling of the event.