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Qt 5.2 introduces many new features and improvements as well as bugfixes
over the 5.1.x series. For more details, refer to the online documentation
included in this distribution. The documentation is also available online:
http://qt-project.org/doc/qt-5.2
The Qt version 5.2 series is binary compatible with the 5.1.x series.
Applications compiled for 5.1 will continue to run with 5.2.
Some of the changes listed in this file include issue tracking numbers
corresponding to tasks in the Qt Bug Tracker:
http://bugreports.qt-project.org/
Each of these identifiers can be entered in the bug tracker to obtain more
information about a particular change.
****************************************************************************
* Library *
****************************************************************************
QtWidgets
---------
- QAbstractScrollArea now has a SizeAdjustPolicy. If it is set to AdjustToContents
it will make use of the new protected viewportSizeHint() (binary compatible since it
was reserved in Qt5). This function returns a suggested size based on contents.
- QTreeView now has setTreePosition to allow the treestructure to show data from other
columns than logicalindex zero.
- [QTBUG-4206] QTableView resizeToContents will now adjust to actual contents
and not just visible area. QHeaderView::setAutoResizePrecision() has been
introduced to control how precise the autoResize should be.
- QFileDialog::setDefaultSuffix() removes leading dot characters.
- QSizePolicy got a retainSizeWhenHidden attribute.
- [QTBUG-31602] QSpinBox size calculation will now be fixed when stylesheets are
used.
QtCore
------
- [QTBUG-30250] QTime, QDateTime:
When calling QTime::toString(Qt::TextDate) and QTime::toString(Qt::ISODate),
milliseconds are now included in the returned string. This also applies to
QDateTime::toString(Qt::TextDate) and QDateTime::toString(ISODate).
- QtAlgorithms
With STL no longer being optional for building and using Qt, a number of parts
of QtAlgorithms no longer make sense, and have therefore been deprecated.
Replacements are available in the STL, and generally have much better
performance, but are not instantly source-compatible in all cases. For
instance, specialization of qLess or qSwap means that a direct port to
std::sort from qSort may not be possible, as std::sort does not use any of
them; a possible workaround is explicitly passing a qLess functor to
std::sort:
std::sort(container.begin(), container.end(), qLess<T>());
The functions in QtAlgorithms that have been deprecated, along with their
STL counterparts, are:
- qBinaryFind (std::binary_search / std::lower_bound)
- qCopy (std::copy)
- qCopyBackward (std::copy_backward)
- qEqual (std::equal)
- qFill (std::fill)
- qFind (std::find)
- qCount (std::count)
- qSort (std::sort)
- qStableSort (std::stable_sort)
- qLowerBound (std::lower_bound)
- qUpperBound (std::upper_bound)
- qLess (std::less)
- qGreater (std::greater)
QtGui
-----
- [QTBUG-28228] Session Management:
The new QPlatformSessionManager class brings back the session management
functionality. It allows the implementation of platform specific behavior
related to session management. For platform that don't support this
feature the default behavior has not changed.
Both X11 and Windows session management are supported.
QtNetwork
---------
- API was added to store and resume TLS session tickets.
- The minimum support openssl version has been increased to openssl 1.0. The
code to support older versions has not been removed, but is no longer
supported.
- An off-by-one error in NTLM proxy authentication has been fixed.
- Various improvements to reduce the memory used by qtnetwork have been made.
- Improved support for HTTP proxy authentication.
- Support for preconnecting to servers before making HTTP and HTTPS
connections. This allows for much reduced latency when the hosts to be
connected to are known.
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