d8bf317546
On modern ARM CPUs there is no speed difference between float and double anymore, so let's rather use double for qreal to avoid rounding and precision issues. Like this we also get much better compatibility with our desktop OSes. This is not binary compatible on ARM, but the old behavior can be restored by passing -qreal float to configure. Change-Id: I2a4b61e19a3dfa6b0bd76734cecf2634c97207fc Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
163 lines
7.0 KiB
Plaintext
163 lines
7.0 KiB
Plaintext
Qt 5.2 introduces many new features and improvements as well as bugfixes
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over the 5.1.x series. For more details, refer to the online documentation
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included in this distribution. The documentation is also available online:
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http://qt-project.org/doc/qt-5.2
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The Qt version 5.2 series is binary compatible with the 5.1.x series.
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Applications compiled for 5.1 will continue to run with 5.2.
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Some of the changes listed in this file include issue tracking numbers
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corresponding to tasks in the Qt Bug Tracker:
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http://bugreports.qt-project.org/
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Each of these identifiers can be entered in the bug tracker to obtain more
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information about a particular change.
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****************************************************************************
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* Architecture Specific Changes *
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****************************************************************************
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Qt is now compiled with qreal typedef'ed to double on all platforms. qreal
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was a float on ARM chipsets before. This guarantees more consistent behavior
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between all platforms Qt supports, but is binary incompatible to Qt 5.1
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on ARM. The old behavior can be restored by passing -qreal float to
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configure.
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****************************************************************************
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* Library *
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****************************************************************************
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QtWidgets
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---------
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- QAbstractScrollArea now has a SizeAdjustPolicy. If it is set to AdjustToContents
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it will make use of the new protected viewportSizeHint() (binary compatible since it
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was reserved in Qt5). This function returns a suggested size based on contents.
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- QTreeView now has setTreePosition to allow the treestructure to show data from other
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columns than logicalindex zero.
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- [QTBUG-4206] QTableView resizeToContents will now adjust to actual contents
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and not just visible area. QHeaderView::setAutoResizePrecision() has been
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introduced to control how precise the autoResize should be.
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- QFileDialog::setDefaultSuffix() removes leading dot characters.
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- [QTBUG-34132] QFileDialog does not instantiate widgets if a native dialog
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will be used instead. Therefore some accessors which previously returned
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unused objects will now return null. As before, you can set the
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DontUseNativeDialog option to ensure that widgets will be created and used instead.
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- QSizePolicy got a retainSizeWhenHidden attribute.
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- [QTBUG-31602] QSpinBox size calculation will now be fixed when stylesheets are
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used.
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QtCore
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------
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- [QTBUG-30250] QTime, QDateTime:
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When calling QTime::toString(Qt::TextDate) and QTime::toString(Qt::ISODate),
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milliseconds are now included in the returned string. This also applies to
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QDateTime::toString(Qt::TextDate) and QDateTime::toString(ISODate).
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- QtAlgorithms
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With STL no longer being optional for building and using Qt, a number of parts
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of QtAlgorithms no longer make sense, and have therefore been deprecated.
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Replacements are available in the STL, and generally have much better
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performance, but are not instantly source-compatible in all cases. For
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instance, specialization of qLess or qSwap means that a direct port to
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std::sort from qSort may not be possible, as std::sort does not use any of
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them; a possible workaround is explicitly passing a qLess functor to
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std::sort:
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std::sort(container.begin(), container.end(), qLess<T>());
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The functions in QtAlgorithms that have been deprecated, along with their
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STL counterparts, are:
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- qBinaryFind (std::binary_search / std::lower_bound)
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- qCopy (std::copy)
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- qCopyBackward (std::copy_backward)
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- qEqual (std::equal)
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- qFill (std::fill)
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- qFind (std::find)
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- qCount (std::count)
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- qSort (std::sort)
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- qStableSort (std::stable_sort)
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- qLowerBound (std::lower_bound)
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- qUpperBound (std::upper_bound)
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- qLess (std::less)
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- qGreater (std::greater)
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QtGui
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-----
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- [QTBUG-28228] Session Management:
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The new QPlatformSessionManager class brings back the session management
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functionality. It allows the implementation of platform specific behavior
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related to session management. For platform that don't support this
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feature the default behavior has not changed.
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Both X11 and Windows session management are supported.
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QtNetwork
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---------
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- API was added to store and resume TLS session tickets.
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- The minimum support openssl version has been increased to openssl 1.0. The
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code to support older versions has not been removed, but is no longer
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supported.
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- An off-by-one error in NTLM proxy authentication has been fixed.
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- Various improvements to reduce the memory used by qtnetwork have been made.
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- Improved support for HTTP proxy authentication.
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- Support for preconnecting to servers before making HTTP and HTTPS
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connections. This allows for much reduced latency when the hosts to be
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connected to are known.
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QtSql
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-----
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Changes in Qt 5.1.0 (missing from released changelog dist/changes-5.1.0)
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- [QTBUG-28088] Remove dependency of DB driver headers on qsqlcachedresult_p.h.
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- Deprecate QSqlError setters.
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The constructor is sufficient, since it has a parameter for each member variable.
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- Rename the SQL driver header files to _p.h (make private)
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The drivers were never public API. They were exposed by mistake in
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public headers. What's more, they have #include'd a private header
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(qsqlcachedresult_p.h) since at least Qt 4.5.1. That means no one used
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those headers in Qt 4 (private headers weren't installed then) and
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it's unlikely anyone did in 5.0.
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- ODBC: Implemented lastInsertId() for some ODBC compatible databases.
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- PSQL: Make lastInsertID work for tables without OIDs.
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- [QTBUG-14904] SQLITE: Fix for Sql query aliases with dots
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- [QTBUG-2192] ODBC: fix loss of milliseconds when binding QDateTime
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- [QTBUG-30076] PSQL: escape backslashes only when server requires it
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IMPORTANT: Applications that implemented their own workarounds must be
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updated to avoid misbehavior and SQL injection vulnerabilities.
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- [QTBUG-10569] ODBC: fixed QODBCResult::exec() return value for DELETE
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operations when no rows are affected.
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- ODBC: Fixed loss of column metadata on SQL_NO_DATA.
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- QSqlTableModel: expose methods for getting primary values.
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- ODBC: Fixed possible cause of spurious errors (commit af35ee291a1bbbc8)
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Changes in Qt 5.2.0
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- [QTBUG-29261] IBASE: Construct a valid QTime when creating timestamps for iBase SQL driver.
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- [QTBUG-33389] PSQL: Format QDateTime following ISO8601.
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****************************************************************************
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* Platform Specific Changes *
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****************************************************************************
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Qt for Android
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--------------
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- Project structure and deployment has changed with the introduction of
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androiddeployqt. Source and build files are no longer mixed, and the
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build files for the APK package should not be touched. Customizing
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the build files is possible. Read the documentation for androiddeployqt
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for more information.
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