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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page widgets-changes-qt6.html
\title Changes to Qt Widgets
\ingroup changes-qt-5-to-6
\brief Changes in Kernel classes, Widgets, ItemViews, and Utility Classes.
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 The QWidget class
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.
\section1 Widgets
\section2 The QAbstractButton class
The default timeout parameter for QAbstractButton::animateClick() is
removed to allow modern connection syntax without the need for qOverload.
\section2 The QComboBox class
The QComboBox::setModel() function is now virtual.
\section2 The QDateTimeEdit class
When QDateTimeEdit::setDateTime() is called with a date-time whose
time-spec doesn't match that of the QDateTimeEdit instance, the
date-time is converted to the time-spec of the QDateTimeEdit. This
gives a date-time that describes the same instant in time, but
does so in the same terms as the QDateTimeEdit uses. Previously,
the date and time from the passed date-time were combined with the
time-spec of the widget, ignoring the time-spec of the date-time;
this could describe a different point in time than the one
described by the date-time passed.
\section1 ItemViews
\section2 The QAbstractItemView class
The virtual viewOptions() method that previously returned a QStyleOptionViewItem
object has been renamed to initViewItemOption, and initializes a
QStyleOptionViewItem object that's passed in through a pointer.
\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.
\section2 Style sheet changes
Styling a widget by its property in Qt 5 vs Qt 6 is different, especially if the
property is an enum. In Qt 5, the selector value for such a property is the integer
equivalent of the enum value, while in Qt 6 the string value is used. The following
example demonstrates this difference:
\code
// Qt 5 style sheet
QToolButton[popupMode="1"] {
padding-right: 20px;
}
\endcode
\code
// Qt 6 style sheet
QToolButton[popupMode=MenuButtonPopup] {
padding-right: 20px;
}
\endcode
\section1 Utility Classes
\section2 QUndoCommand, QUndoStack, and QUndoGroup
The widget independent classes of the Undo/Redo framework have been moved
into the QtGui module.
*/
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