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/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
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****************************************************************************/
/*!
\page widgets-changes-qt6.html
\title Porting to Qt 6 - Qt Widgets
\ingroup porting-guides-5-to-6
\brief Migrate Qt Widgets to Qt 6.
Qt 6 is a result of the conscious effort to make the framework more
efficient and easy to use.
We try to maintain binary and source compatibility for all the public
APIs in each release. But some changes were inevitable in an effort to
make Qt a better framework.
In this topic we summarize those changes in Qt Widgets, and provide
guidance to handle them.
\section1 Kernel classes
\section2 QWidget
The virtual QWidget::enterEvent() handler now receives a QEnterEvent*
parameter which has information about the pointer position, rather than
a plain QEvent*.
\section2 QDesktopWidget and QApplication::desktop()
QDesktopWidget was already deprecated in Qt 5, and has been removed in
Qt 6, together with QApplication::desktop().
QScreen provides equivalent functionality to query for information about
available screens, screen that form a virtual desktop, and screen
geometries.
Use QWidget::setScreen() to create a QWidget on a specific display;
note that this does not move a widget to a screen in a virtual desktop
setup.
\section2 QAction, QActionGroup
These classes have been moved into the QtGui module. Member functions that
depend on types defined in QtWidgets (such as QAction::menu() and
QAction::setMenu()) are implemented as templates that will be instantiated
only when called.
\section2 QPixmap, QBitmap, and QCursor
QBitmap and QCursor can no longer be implicitly created from a QPixmap; use
the explicit constructor and factory function instead.
\section1 Widgets
\section2 QAbstractButton
The default timeout parameter for QAbstractButton::animateClick() is
removed to allow modern connection syntax without the need for qOverload.
\section2 QComboBox
The QComboBox::setModel() function is now virtual.
\section1 Styling Classes and related APIs
All versioned QStyleOption subclasses are consolidated, and the version
numbers are reset to 1.
The various initStyleOption() methods in widget classes are now virtual.
\section1 Printing Classes
\section2 QPagedPaintDevice, QPrinter, QPageSize, QPageLayout
The various enums and types for \l{QPageSize}{page sizes},
margins, and orientation have been consolidated. QPrinter APIs to set
paper sizes and margins explicitly have been removed; use
QPagedPaintDevice::setPageLayout(), QPagedPaintDevice::setPageSize(),
QPagedPaintDevice::setPageOrientation(), and
QPagedPaintDevice::setPageMargins() instead.
*/
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