1 Some of the changes listed in this file include issue tracking numbers
2 corresponding to tasks in the Qt Bug Tracker:
4 http://bugreports.qt-project.org/
6 Each of these identifiers can be entered in the bug tracker to obtain more
7 information about a particular change.
10 ****************************************************************************
11 * Source incompatible changes *
12 ****************************************************************************
16 * The signatures of the connectNotify() and disconnectNotify() functions
17 have changed. The functions now get passed a QMetaMethod that identifies
18 the signal, rather than a const char *.
20 - QSslCertificate::subjectInfo() and QSslCertificate::issuerInfo() now
21 return a QStringList instead of a QString
23 - QSslCertificate::isValid() has been deprecated. Originally it only checked
24 the certificate dates, but later checking for blacklisting was added. Now
25 there's a more specific QSslCertificate::isBlacklisted() method.
27 - Unite clipping support has been removed from QPainter. The alternative is
28 to unite QRegion's and using the result on QPainter.
30 - QLibrary::resolve() now returns a function pointer instead of a void
33 - QSslCertificate::alternateSubjectNames() is deprecated (but can be enabled
34 via QT_DISABLE_DEPRECATED_BEFORE), use
35 QSslCertificate::subjectAlternativeNames() instead.
37 - QLibraryInfo::buildKey() has been removed. Likewise, the QT_BUILD_KEY
38 preprocessor #define has also been removed. The build-key is obsolete
39 and is no longer necessary.
41 - QCoreApplication::translate() will no longer return the source text when
42 the translation is empty. Use lrelease -removeidentical for optimization.
44 - QTranslator subclasses need to adjust the signature of the virtual method
45 translate() in order to add the "int n = -1" argument.
47 - QString and QByteArray constructors that take a size argument will now treat
48 negative sizes to indicate nul-terminated strings (a nul-terminated array of
49 QChar, in the case of QString). In Qt 4, negative sizes were ignored and
50 result in empty QString and QByteArray, respectively. The size argument to
51 those constructors now has a default value of -1, thus replacing the separate
52 constructors that did the same.
54 - Qt::escape() is deprecated (but can be enabled via
55 QT_DISABLE_DEPRECATED_BEFORE), use QString::toHtmlEscaped() instead.
57 - QBool is gone. QString::contains, QByteArray::contains, and QList::contains
58 used to return an internal QBool class so that the Qt3 code
59 "if (a.contains() == 2)" wouldn't compile anymore. Such code cannot exist
60 in Qt4, so these methods return a bool now. If your code used the undocumented
61 QBool, simply replace it with bool.
63 - qIsDetached<> has been removed without replacement.
65 - The return type of QFlags<Enum>::operator int() now matches the Enum's underlying
66 type in signedness instead of always being 'int'. This was done in order to allow
67 QFlags over enums whose underlying type is unsigned (Qt::MouseButton is one such
71 * QMetaType::construct() has been renamed to QMetaType::create().
72 * QMetaType::unregisterType() has been removed.
73 * QMetaType now records if the type argument inherits QObject. This
74 can be used in scripting APIs, so that custom QObject subclasses
75 are treated as QObject pointers. In QtScript for example, this can
76 mean that QScriptValue.isQObject can be true where it was false before.
77 * QMetaType::QWidgetStar has been removed. Use qMetaTypeId<QWidget*>()
78 or QVariant::canConvert<QWidget*>() as appropriate.
81 * QMetaMethod::signature() has been renamed to QMetaMethod::methodSignature(),
82 and the return type has been changed to QByteArray. This was done to be able
83 to generate the signature string on demand, rather than always storing it in
85 * QMetaMethod::typeName() no longer returns an empty string when the return
86 type is void; it returns "void". The recommended way of checking whether a
87 method returns void is to compare the return value of QMetaMethod::returnType()
91 * Inconsistent constructor taking Qt::GlobalColor and producing QVariant(QColor)
92 instance was removed. Code constructing such variants can be migrated by
93 explicitly calling QColor constructor. For example from "QVariant(Qt::red)"
94 to "QVariant(QColor(Qt::red))"
95 * Similarly, implicit creation of QVariants from enum values Qt::BrushStyle,
96 Qt::PenStyle, and Qt::CursorShape have been removed. Create objects explicitly
97 or use static_cast<int>(Qt::SolidLine) to create a QVariant of type int with
98 the same value as the enum.
101 * The historical language and country names were updated to their modern values,
102 some deprecated names were dropped or mapped to their modern alternatives.
105 * The plain-text, xml and lightxml test output formats have been changed to
106 show a test result for every row of test data in data-driven tests. In
107 Qt4, only fails and skips were shown for individual data rows and passes
108 were not shown for individual data rows, preventing accurate calculation
109 of test run rates and pass rates.
110 * The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
111 These macros formerly lived in tests/shared/util.h but are now provided
112 by including the <QtTest/QtTest> header. In addition,
113 QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
114 allowing for specifying custom timeout values.
115 * The QTEST_NOOP_MAIN macro has been removed from the API. If a test is
116 known at compile-time to be inapplicable for a particular build it should
117 be omitted via .pro file logic, or the test should call QSKIP in the
118 initTestCase() method to skip the entire test and report a meaningful
119 explanation in the test log.
120 * The DEPENDS_ON macro has been removed from the API. This macro did nothing
121 and misled some users to believe that they could make test functions depend
122 on each other or impose an execution order on test functions.
123 * The QTest::qt_snprintf function has been removed from the API. This was an
124 internal testlib function that was exposed in the public API due to its use
125 in a public macro. Any calls to this function should be replaced by a call
126 to qsnprintf(), which comes from the <QtCore/QByteArray> header.
127 * The QTest::pixmapsAreEqual() function has been removed from the API.
128 Comparison of QPixmap objects should be done using QCOMPARE, which provides
129 more informative output in the event of a failure.
130 * The QSKIP macro no longer has the "mode" parameter, which caused problems
131 for calculating test metrics, as the SkipAll mode hid information about
132 what test data was skipped. Calling QSKIP in a test function now behaves
133 like SkipSingle -- skipping a non-data-driven test function or skipping
134 only the current data row of a data-driven test function. Every skipped
135 data row is now reported in the test log.
136 * The qCompare() function template was both overloaded and specialised, which
137 made it almost impossible to specialise the correct primary template and
138 could lead to indecipherable error messages or surprising overload resolution
139 (such as going via qCompare(QFlags<void*>,int) to satisfy a request for
140 qCompare<void*>()). Now, specialisation has been replaced by overloading.
141 As a consquence, code such as qCompare<QString>(l, r) will no longer use the
142 QString-specific implementation and may fail to compile. We recommend you
143 replace specialisations with overloading, too. Also, don't pass explicit
144 template arguments to qCompare (e.g. qCompare<QString>(l, r)), but let
145 overload resolution pick the correct one, and cast arguments in case of
146 ambiguous overloads (e.g. qCompare(QString(l), r)). The resulting code will
147 continue to work against older QtTestlib versions.
149 - The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .
152 * Internal QAccessible::State enum value HasInvokeExtension removed
153 - QAccessibleInterface:
154 * The "child" integer parameters have been removed. This moves the api
155 to be closer to IAccessible2.
156 This means several functions lose their integer parameter:
157 text(Text t, int child) -> text(Text t), rect(int child) -> rect()
158 setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
159 role(int child) -> role(), state(int child) -> state()
160 * parent() and child() was added in order to do hierarchical navigation.
161 * relations() was added as a replacement to relationTo()
162 * As a consequence of the above two points, navigate() was removed.
163 * Accessible-Action related functions have been removed. QAccessibleInterface
164 subclasses are expected to implement the QAccessibleActionInterface instead.
165 These functions have been removed:
166 QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
167 QAccessibleInterface::doAction
168 - QAccessibleEvent also loses the child parameter.
169 QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
170 QAccessibleEvent::child() removed.
171 - QAccessibleActionInterface:
172 * Refactored to be based on action names. All functions have been changed from using
173 int parameters to strings.
175 - QSound has been moved from QtGui to QtMultimedia
177 - QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
178 as all coordinates are floating point based now.
182 * The DeviceType enum and deviceType() have been deprecated due to
183 the introduction of QTouchDevice.
185 * The signature of the constructor has changed. It now takes a
186 QTouchDevice pointer instead of just a DeviceType value.
188 * TouchPointState no longer includes TouchPointStateMask and
189 TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
192 * QWidget *widget() has been removed and is replaced by QObject
193 *target() in order to avoid QWidget dependencies.
195 * QEvent::TouchCancel has been introduced. On systems where it makes
196 sense this event type can be used to differentiate between a
197 regular TouchEnd and abrupt touch sequence cancellations caused by
198 the compositor, for example when a system gesture gets recognized.
202 * Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
203 cases where a forward declared type should be used as a metatype,
204 Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
205 * Similarly, Q_DECLARE_METATYPE(QSharedPointer<Foo>), and
206 Q_DECLARE_METATYPE(QWeakPointer<Foo>) require Foo to be fully defined. Again
207 though, Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
211 * The signature of the createEditor and valuePropertyName methods
212 have been changed to take arguments of type int instead of QVariant::Type.
214 - QModelIndex/QAbstractItemModel
216 * The integer value that can be stored in a QModelIndex is now of type
217 quintptr to match the size of the internal storage location.
218 * The createIndex() method now only provides the void* and quintptr
219 overloads, making calls with a literal 0 (createIndex(row, col, 0))
220 ambiguous. Either cast (quintptr(0)) or omit the third argument
221 (to get the void* overload).
223 - QWindowSystemInterface:
225 * The signature of all handleTouchEvent() variants have changed,
226 taking a QTouchDevice* instead of just a DeviceType value.
227 Platform or generic plug-ins have to create and register at least
228 one QTouchDevice before sending the first touch event.
230 * The event type parameter is removed from handleTouchEvent().
232 - The previously exported function qt_translateRawTouchEvent() has been removed.
233 Use QWindowSystemInterface::handleTouchEvent() instead.
235 - QAbstractEventDispatcher
237 * The signature for the pure-virtual registerTimer() has changed. Subclasses
238 of QAbstractEventDispatcher will need to be updated to reimplement the new
239 pure-virtual 'virtual void registerTimer(int timerId, int interval,
240 Qt::TimerType timerType, QObject *object) = 0;'
242 * QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
243 now a struct with 3 members: struct TimerInfo { int timerId; int interval;
244 Qt::TimerType timerType; }; Reimplementations of
245 QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
246 3 arguments to the TimerInfo constructor (instead of 2).
250 * Removed implicit conversion operator QUuid::operator QString(), instead
251 QUuid::toString() function should be used.
253 - The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
254 been removed, QNetworkAccessManager should be used instead.
256 - The QFtp and QUrlInfo classes are no longer exported, QNetworkAccessManager should be used
257 instead. These classes are available in a separate module, qtftp.
261 * On Windows, QProcess::ForwardedChannels will not forward the output of GUI
262 applications anymore, if they do not create a console.
264 - QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
265 connectToHostImplementation() and disconnectFromHostImplementation() don't exist.
267 - QTcpServer::incomingConnection() now takes a qintptr instead of an int.
269 - QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.
271 - QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
272 QDir::toNativeSeparators() instead.
274 - QIconEngineV2 was merged into QIconEngine
275 You might need to adjust your code if it used a QIconEngine.
278 * Projects which explicitly set an empty TARGET are considered broken now.
279 * The makespec and .qmake.cache do not see build pass specific variables any more.
280 * load()/include() with a target namespace and infile()/$$fromfile() now start with
281 an entirely pristine context.
282 * Configure's -sysroot and -hostprefix are now handled slightly differently.
283 The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
284 the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
285 The new QT_HOST_... properties can be used to refer to the Qt host tools.
286 * Several functions and built-in variables were modified to return normalized paths.
287 * The -(no-)exception flags in configure have been removed. Qt modules are now compiled
288 without exceptions by default, as they do not use them and can neither handle them
289 properly. Qt Core still has exceptions enabled to correctly throw bad_alloc exceptions
291 Whether code should be compiled with exception support enabled or disabled can be
292 controlled by a CONFIG += exceptions/exceptions_off setting in the .pro file.
294 - QTextCodecPlugin has been removed since it is no longer used. All text codecs
295 are now built into QtCore.
297 - QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
298 to use or check both.
300 - QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
301 QAbstractFileEngineHandler were removed from public API and are no longer
302 exported. They may temporarily live as private implementation details, but
303 they may be altogether dropped or otherwise changed at will in the future.
306 * toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
307 longer take a parameter for base, they will only perform localised base 10
308 conversions. For converting other bases use the QString methods instead.
310 - QSystemLocale has been removed from the public API.
312 - QSqlQueryModel::indexInQuery() is now virtual. See note below under QtSql.
314 - QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
315 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
316 are now virtual. See note below under QtSql.
318 - qMacVersion() has been removed. Use QSysInfo::macVersion() or
319 QSysInfo::MacintoshVersion instead.
321 - QColorDialog::customColor() now returns a QColor value instead of QRgb.
322 QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
323 take a QColor value for their second parameter instead of QRgb.
325 - QPageSetupDialog has had the PageSetupDialogOption enum and the api to
326 set and get the enum removed as none of the Options are used any more.
328 - QAbstractPageSetupDialog has been removed.
330 - QThread::terminated() has been removed, since its emission cannot be guaranteed.
332 - QPrintEngine - Removed the PPK_SuppressSystemPrintStatus key as no longer used.
334 - QCoreApplication::Type and QApplication::type() have been removed. These
335 Qt3 legacy application types did not match the application types
336 available in Qt5. Use for example qobject_cast instead to dynamically
337 find out the exact application type.
339 - The following QStyle implementations have been made internal:
344 * QWindowsMobileStyle
348 Instead of creating instances or inheriting these classes directly, use:
349 * QStyleFactory for creating instances of specific styles
350 * QProxyStyle for customizing existing style implementations
351 * QCommonStyle as a base for implementing full custom styles.
353 ****************************************************************************
355 ****************************************************************************
360 - The directory structure of the qtbase unit-tests has been reworked to
361 more closely match the directory structure of the code under test.
362 Integration tests have been moved to tests/auto/integrationtests.
364 - Qt is compiled with C++11 support enabled by default, provided the compiler
365 supports C++11. Qmake based projects can enable C++11 support explicitly
366 using 'CONFIG+=c++11' in their .pro files. To enable it conditionally, use
367 'contains(QT_CONFIG,c++11):CONFIG+=c++11'. This will enable C++11 support
368 only if Qt was built with C++11 support.
370 - The Unicode Data and Algorithms has been updated to match the
371 Unicode Standard of version 6.2. For more information see http://www.unicode.org/
373 - The QLocale data has been updated to CLDR 22.1.
374 For more information see http://cldr.unicode.org/
376 Third party components
377 ----------------------
379 - SQLITE_ENABLE_FTS3,SQLITE_ENABLE_FTS3_PARENTHESIS and SQLITE_ENABLE_RTREE
380 flags are now enabled by default on all platforms, for the sqlite3 copy under
381 the 3rdparty directory.
386 - Copyright of Qt has been transferred to Digia Plc.
388 ****************************************************************************
390 ****************************************************************************
394 * [QTBUG-12144], [QTBUG-18360] The QChar methods are now able to handle the full range
395 of Unicode codepoints defined by the Unicode Standard of version 6.2.
396 QChar::isPrint() will no longer return a false positives for
397 the Unicode format characters, surrogates, and private use characters.
399 * Drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
400 value is returned for an unassigned codepoints now.
402 * layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
403 layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
404 should now also connect to (and disconnect from) the rowsAboutToBeMoved and
407 * The QAbstractItemModel::sibling method was made virtual, allowing implementations
408 to optimize based on internal data.
410 * The default value of the property QSortFilterProxyModel::dynamicSortFilter was
411 changed from false to true.
413 * The signature of the virtual QAbstractItemView::dataChanged method has changed to
414 include the roles which have changed. The signature is consistent with the dataChanged
417 * QFileSystemWatcher is now able to return failure in case of errors whilst
418 altering the watchlist in both the singular and QStringList overloads of
419 addPath and removePath.
421 * QString::mid, QString::midRef and QByteArray::mid, if the position passed
422 is equal to the length (that is, right after the last character/byte),
423 now return an empty QString, QStringRef or QByteArray respectively.
424 in Qt 4 they returned a null QString or a null QStringRef.
426 * QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
427 toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
428 default or system locale, they will always use the C locale. This is to
429 guarantee consistent default conversion of strings. For locale-aware conversions
430 use the equivalent QLocale methods.
432 * QDate, QTime, and QDateTime have undergone important behavioural changes:
433 * QDate only implements the Gregorian calendar, the switch to the Julian
434 calendar before 1582 has been removed. This means all QDate methods will
435 return different results for dates prior to 15 October 1582, and there is
436 no longer a gap between 4 October 1582 and 15 October 1582.
437 * QDate::setYMD() is deprecated, use QDate::setDate() instead
438 * Most methods now apply strict validity checks and will return appropriate
439 and consistent values when invalid. For example, QDate::year() will return
440 0 and QDate::shortMonthName() will return QString().
441 * Adding days to a null QDate or seconds to a null QTime will no longer return
443 * QDate stores the Julian Day as a qint64 extending date support across a
444 more interesting range, see the class documentation for details.
445 * Conversion to YMD form dates is only accurate between to 4800 BCE to
447 * The QDate::addDays() and QDateTime::addDays() methods now take a qint64
448 * The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64
450 * QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
451 been removed. This was removed due to issues with breaking other code from
452 libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
453 extent) performance issues.
455 * QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed.
456 QObject::trUtf8 and QCoreApplication::Encoding enum are now obsolete. Qt assumes
457 that the source code is encoded in UTF-8.
459 * QFile::setEncodingFunction and QFile::setDecodingFunction are obsolete and do
460 nothing in Qt 5. The QFile::encodeName and QFile::decodeName functions are now
461 hardcoded to operate on QString::fromLocal8Bit and QString::toLocal8Bit
462 only. Therefore, it's still possible to obtain the old behaviour by calling
463 QTextCodec::setCodecForLocale. However, that is not recommended: new code
464 should not make assumptions about the filesystem encoding and older code should
465 have those assumptions removed.
467 * QIntValidator and QDoubleValidator no longer fall back to using the C locale if
468 the requested locale fails to validate the input.
470 * A new set of classes for doing pattern matching with Perl-compatible regular
471 expressions has been added: QRegularExpression, QRegularExpressionMatch and
472 QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
473 powerful and flexible regular expression engine.
475 * QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
476 * The enum values simply didn't make sense in the first place and should simply be dropped.
478 * Filtering of native events (QCoreApplication::setEventFilter, as well as
479 QApplication::x11EventFilter/macEventFilter/qwsEventFilter/winEventFilter) have been replaced
480 with QCoreApplication::installNativeEventFilter and removeNativeEventFilter,
481 for an API much closer to QEvent filtering. Note that the native events that can be
482 filtered this way depend on which QPA backend is chosen, at runtime. On X11, XEvents are
483 not used anymore, and have been replaced with xcb_generic_event_t due to the switch to
484 XCB, which requires porting the application code to XCB as well.
486 * [QTBUG-23529] QHash is now more resilient to a family of denial of service
487 attacks exploiting algorithmic complexity, by supporting two-arguments overloads
488 of the qHash() hashing function.
490 * [QTBUG-4844] QObject::disconnectNotify() is now called when a receiver is destroyed.
493 - [QTBUG-15430] Added a QStateMachine constructor that takes a ChildMode parameter.
494 - [QTBUG-17975] Delayed event posting now works from secondary threads.
495 - [QTBUG-19789] Signal transitions now work correctly when the sender is in a different thread.
496 - [QTBUG-20362] Property assignments now work as expected with nested, parallel states.
497 - [QTBUG-22931] The root state can now be a parallel state group.
498 - [QTBUG-24307] The initial state is now entered before the started() signal is emitted.
499 - [QTBUG-25959] State entry and exit order is now SCXML spec-compliant.
501 * qDebug(), qWarning(), qCritical(), and qFatal() were changed to macros that track the origin
502 of the message in source code. Whether this and other meta-information is printed can be
503 configured (for the default message handler) by setting the new QT_MESSAGE_PATTERN environment
504 variable. qInstallMsgHandler() has been deprecated, and should be replaced with
505 qInstallMessageHandler().
507 * QTextBoundaryFinder
508 - [QTBUG-6498] The word start and word end boundaries detection is now
509 unaware of surrounding white space characters.
510 - SoftHyphen enum value has been added to specify a line break opportunity
511 at a soft hyphen (SHY) character.
512 - MandatoryBreak enum value has been added to specify a mandatory (aka "hard") line breaks.
513 - Source-incompatible change: Since the behavior of boundaryReasons() method
514 has been changed a lot, StartWord/EndWord enum values were intentionally replaced
515 with StartOfItem/EndOfItem ones to force the affected code be revised.
517 * Softkeys API was removed. The following functions and enums were removed:
518 - QAction::setSoftKeyRole()
519 - QAction::softKeyRole()
520 - QAction::SoftKeyRole
521 - Qt::WA_MergeSoftkeys
522 - Qt::WA_MergeSoftkeysRecursively
523 - Qt::WindowSoftkeysVisibleHint
524 - Qt::WindowSoftkeysRespondHint
527 - [QTBUG-27987] Constructing a QLocale object with the short locale id has been improved.
530 - Added overloads of connect() to connect using pointers to member function
531 - Added QObject::isSignalConnected()
535 * Accessibility has been refactored. The hierachy of accessible objects is implemented via
536 proper parent/child functions instead of using navigate which has been deprecated for this purpose.
537 Table and cell interfaces have been added to qaccessible2.h
539 * Touch events and points have been extended to hold additional
540 information like capability flags, point-specific flags, velocity,
543 * A new set of enabler classes have been added, most importantly QWindow, QScreen,
544 QSurfaceFormat, and QOpenGLContext.
546 * Most of the useful QtOpenGL classes have been polished and moved into
547 QtGui. See QOpenGLFramebufferObject, QOpenGLShaderProgram,
548 QOpenGLFunctions, etc.
550 * QOpenGLPaintDevice has been added to be able to use QPainter to render into
551 the currently bound context.
553 * Behavioral change in QImage::fill() on an image with format Format_RGB888:
554 For consistency with RGB32 and other 32-bit formats, function now expects
555 image data in RGB layout as opposed to BGR layout.
557 * Behavioral change in QImage and QPixmap load()/loadFromData() on a non-null image:
558 If load() or loadFromData() fails to load the image (returns false) then
559 the existent image data will be invalidated, so that isNull() is guaranteed
560 to return true in this case.
562 * Behavioral change regarding QPainter fill rules when not using antialiased
563 painting: The fill rules have changed so that the aliased and antialiased
564 coordinate systems match. Earlier there used to be an offset of slightly less
565 than half a pixel when doing sub-pixel rendering, in order to be consistent
566 with the old X11 paint engine. The new behavior should be more predictable and
567 gives the same consistent rounding for images / pixmaps as for paths and
568 rectangle filling. It's possible to still get the old behavior by setting the
569 QPainter::Qt4CompatiblePainting render hint.
571 * Behavioral change regarding QPen: The default QPen constructors now create a
572 1-width non-cosmetic pen as opposed to a 0-width cosmetic pen. The old
573 behavior can be emulated by setting the QPainter::Qt4CompatiblePainting
574 render hint when painting.
578 * A new style QFusionStyle has been introduced, while QPlastiqueStyle, QCleanlooksStyle,
579 QCDEStyle and QMotifStyle have been removed. The older styles will be
580 made available to applications as a standalone source package.
582 * QInputContext removed as well as related getters and setters on QWidget and QApplication.
583 Input contexts are now platform specific.
585 * QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.
587 * In Qt 4, QStyle::standardIconImplementation() and layoutSpacingImplementation()
588 were introduced instead of making the corresponding methods virtual due to binary
589 compatibility reasons. QStyle::standardIcon() and layoutSpacing() have been made
590 (pure) virtual in Qt 5.
592 * In Qt 4, many QStyleOption subclasses were introduced in order to keep
593 binary compatibility -- QStyleOption was designed to be extended this way,
594 in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
595 classes have been removed, and their members merged into the respective
596 base classes. Those classes were left as typedefs to keep existing code
597 working. Still, some minor adjustements could be necessary, especially in code
598 that uses QStyleOption directly and does not initialize all the members using
599 the proper Qt API: due to the version bump, QStyle will try to use the additional
600 QStyleOption members, which are left default-initialized.
602 * QHeaderView has been refactored and the following functions have been obsoleted:
604 * void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.
606 * bool isMovable() const - use bool sectionsMovable() const instead.
608 * void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.
610 * bool isClickable() const - use bool sectionsClickable() instead.
612 * void setResizeMode(int logicalindex, ResizeMode mode) -
613 use setSectionResizeMode(logicalindex, mode) instead.
615 * ResizeMode resizeMode(int logicalindex) const -
616 use sectionResizeMode(int logicalindex) instead.
618 * setSortIndicator will no longer emit sortIndicatorChanged when the sort indicator is unchanged.
620 * QDateEdit and QTimeEdit have re-gained a USER property. These were originally removed
621 before Qt 4.7.0, and are re-added for 5.0. This means that the userProperty for
622 those classes are now QDate and QTime respectively, not QDateTime as they have been
623 for the 4.7 and 4.8 releases.
625 * QGraphicsItem and derived classes - Passing a QGraphicsScene in the items constructor
626 is no longer supported. Construct the item without a scene and then call
627 QGraphicsScene::addItem() to add the item to the scene.
629 * QAbstractItemView and derived classes only emit the clicked() signal on left click now,
630 instead of on all mouse clicks.
632 * QProxyModel has been removed. It is deprecated since early Qt 4 versions and replaced
633 by QAbstractProxyModel and related classes. A copy of QProxyModel is available
634 in the UiHelpers library.
636 * The virtual methods QApplication::commitData and QApplication::saveState, used for session
637 management, no longer exist.
638 Connect to the commitDataRequest and saveStateRequest signals instead.
639 The new isSessionSaving() method can be used in the cases where the closeEvent of your
640 window needs to know whether it is being called during shutdown.
642 * [QTBUG-20503] QFileSystemModel no longer masks out write permissions from the permissions
643 returned from permissions() or data(FilePermissions), even if in read-only mode
644 (QFileSystemModel::isReadOnly()).
646 * [QTBUG-158 QTBUG-428 QTBUG-26501] QComboBox::currentText improvements
647 Restored currentText as USER property.
648 New setter setCurrentText(), marked as WRITE method, usable by QItemDelegate and QDataWidgetMapper.
649 New signal currentTextChanged() marked as NOTIFY method.
653 * QHostAddress::isLoopback() API added. Returns true if the address is
654 one of the IP loopback addresses.
656 * QSslCertificate::serialNumber() now always returns the serial number in
659 * The openssl network backend now reads the ssl configuration file allowing
660 the use of openssl engines.
664 * QtDBus now generates property annotations for the Qt type names
665 in the org.qtproject.QtDBus namespace. When parsing such annotations
666 both the old and new namespaces are accepted.
668 * QtDBus error codes have been updated to be on the org.qtproject.QtDBus.Error
674 * QtConcurrent is no longer in QtCore, but forms its own library now.
675 QMake-based projects can use
677 to include the new library.
679 * QtConcurrent::Exception has been renamed to QException, and is still in QtCore.
680 Ditto QtConcurrent::UnhandledException.
685 * Most of the classes in this module (with the notable exception of QGLWidget)
686 now have equivalents in QtGui, along with the naming change QGL -> QOpenGL.
687 The classes in QtOpenGL that have equivalents in QtGui can now be considered
689 * QGLPixelBuffer is now deprecated and implemented in terms of a hidden
690 QGLWidget and a QOpenGLFramebufferObject. It is recommended that applications
691 using QGLPixelBuffer for offscreen rendering to a texture switch to using
692 QOpenGLFramebufferObject directly instead, for improved performance.
693 * The default major version of QGLFormat has been changed to 2 to be aligned
694 with QSurfaceFormat. Applications that want to use a different version should
695 explicitly request it using QGLFormat::setVersion().
696 * void QGLContext::generateFontDisplayLists(const QFont& font, int listBase)
697 and int QGLWidget::fontDisplayListBase(const QFont & fnt, int listBase)
698 which were deprecated in Qt 4 have been removed.
699 * Previously deprecated default value listBase parameter has been removed from
700 both QGLWidget::renderText() functions.
701 * In order to ensure support on more platforms, stricter requirements have been
702 introduced for doing threaded OpenGL. First, you must call makeCurrent() at
703 least once per swapBuffers() call, so that the platform has a chance to
704 synchronize resizes to the OpenGL surface. Second, before doing makeCurrent()
705 or swapBuffers() in a separate thread, you must call
706 QGLContext::moveToThread(QThread *) to explicitly let Qt know in which thread
707 a QGLContext is currently being used. You also need to make sure that the
708 context is not current in the current thread before moving it to a different
713 * [QTBUG-2124] Added default conversion for long and unsigned long.
714 * [QTBUG-6133] Fixed QScriptContextInfo::functionMetaIndex() for overloaded
716 * [QTBUG-15213] Doc: Added missing properties to the ECMAScript reference.
717 * [QTBUG-15956] Doc: Removed wrong information about Error .stack properties.
718 * [QTBUG-17915] Fixed a crash when a JS property descriptor was only partially
720 * [QTBUG-18188] Fixed a regression that caused contexts created by
721 QScriptEngine::pushContext() to inherit the parent context's scope.
722 * [QTBUG-18201] Suppressed 'LEAK' messages on stderr at application exit.
723 * [QTBUG-20378] Fixed QtScriptTools compilation when some features are disabled.
724 * [QTBUG-20845] Fixed a precision bug in the calculator example.
725 * [QTBUG-21548] Fixed a crash in QScriptEngineDebugger when the QScriptEngine
726 being debugged was deleted.
727 * [QTBUG-21760] Fixed a crash when accessing QObject properties through an
729 * [QTBUG-21896] Fixed a crash when converting an invalid JS value to a string.
730 * [QTBUG-21993] Fixed a bug that caused QObject wrapper objects created with
731 the PreferExistingWrapperObject option to not be garbage collected, even if
732 the object was not referenced anywhere in the scripting environment.
733 * [QTBUG-22152] Fixed build issue on Solaris.
734 * [QTBUG-23871] Fixed a JIT crash on x86-64 caused by out-of-range branch
736 * [QTBUG-26261] Fixed a crash when a queued signal handler no longer existed.
737 * [QTBUG-26590] Fixed a bug that caused QObjects with script connections to
738 not be garbage collected as expected.
742 * [QTBUG-20615] Autotests can now log test output to multiple destinations
743 and log formats simultaneously.
744 * [QTBUG-21645] QSignalSpy now handles QVariant signal parameters more
745 intuitively; the QVariant value is copied directly, instead of being
746 wrapped inside a new QVariant. This means that calling
747 qvariant_cast<QVariant>() on the QSignalSpy item (to "unwrap" the value)
748 is no longer required (but still works).
752 QSqlQueryModel/QSqlTableModel/QSqlRelationalTableModel
754 * The dataChanged() signal is now emitted for changes made to an inserted
755 record that has not yet been committed. Previously, dataChanged() was
756 suppressed in this case for OnRowChange and OnFieldChange. This was probably
757 an attempt to avoid trouble if setData() was called while handling
758 primeInsert(). By emitting dataChanged(), we ensure that all views are aware
761 * While handling primeInsert() signal, the record must be manipulated using
762 the provided reference. Do not attempt to manipulate the records using the
763 model methods setData() or setRecord().
765 * removeRows() no longer emits extra beforeDelete signal for out of range row.
767 * removeRows() now requires the whole range of targetted rows to be valid
768 before doing anything. Previously, it would remove what it could and
769 ignore the rest of the range.
771 * removeRows(), for OnFieldChange and OnRowChange, allows only 1 row to be
772 removed and only if there are no other changed rows.
774 * setRecord() and insertRecord()
775 -The generated flags from the source record are preserved in the model
776 and determine which fields are included when changes are applied to
778 -Require all fields to map correctly. Previously fields that didn't
779 map were simply ignored.
780 -For OnManualSubmit, insertRecord() no longer leaves behind an empty
781 row if setRecord() fails.
782 -setRecord() now automatically submits for OnRowChange.
784 * QSqlQueryModel::indexInQuery() is now virtual. See
785 QSqlTableModel::indexInQuery() as example of how to implement in a
788 * QSqlQueryMode::setQuery() emits fewer signals. The modelAboutToBeReset()
789 and modelReset() signals suffice to inform views that they must reinterrogate
792 * QSqlTableModel::select() is now a slot.
794 * QSqlTableModel::selectRow(): This is a new slot that refreshes a single
795 row in the model from the database.
797 * QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
798 Previously, after changes were submitted in these edit strategies, select()
799 was called which removed and inserted all rows. This ruined navigation
800 in QTableView. Now, with these edit strategies, there is no implicit select()
801 done after committing. This includes deleted rows which remain in
802 the model as blank rows until the application calls select(). Instead,
803 selectRow() is called to refresh only the affected row.
805 * QSqlTableModel::isDirty(): New overloaded method to check whether model
806 has any changes to submit. QTBUG-3108
808 * QSqlTableModel::setData() and setRecord() no longer revert pending changes
809 that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
810 Instead, pending (failed) changes cause new changes inappropriate to the
811 edit strategy to be refused. The application should resolve or revert pending
812 changes. insertRows() and insertRecord() also respect the edit strategy.
814 * QSqlTableModel::setData() and setRecord() in OnRowChange no longer have the
815 side effect of submitting the cached row when invoked on a different row.
817 * QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
818 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
819 are now virtual. Their xxxImplemenation counterparts have been removed
820 now that QSqlDriver subclasses can reimplement these directly.
822 ****************************************************************************
824 ****************************************************************************
828 * QVariant::Bool type now mapped to integers 0/1 in SQL instead of strings
829 'true' and 'false'. Sqlite does not have a boolean column type and it is
830 customary to use integer. QTBUG-23895
834 * the error message returned in QSqlError::text() has the SQLSTATE error code
835 appended in parantheses.
837 ****************************************************************************
838 * Platform Specific Changes *
839 ****************************************************************************
847 * Accessibility framework uses IAccessible2
848 * ANGLE can be used to provide Open GL ES 2.0 (see http://code.google.com/p/angleproject/)
854 Qt for Embedded Linux
855 ---------------------
862 ****************************************************************************
863 * Compiler Specific Changes *
864 ****************************************************************************
867 ****************************************************************************
869 ****************************************************************************
873 * Remove qttest_p4.prf file. From now on we should explicitly enable the
874 things from it which we want. Autotest .pro files should stop using
875 'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.
880 * [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
881 translation attributes which apply to all items.
882 They are by default translatable.
891 * [QTBUG-20785] The moc now has a -b<file> option to #include an additional
892 file at the beginning of the generated file.
893 * moc is now able to fully understand and expands preprocessor macros.
903 * QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
909 * The Mac OS X -dwarf2 configure argument has been removed. DWARF2 is always
910 used on Mac OS X now.
915 ****************************************************************************
917 ****************************************************************************
918 - The text codecs that were previously plugins are now built into QtCore.
919 - Code using Q_EXPORT_PLUGIN macros will no longer compile. Use
920 Q_PLUGIN_METADATA instead. Note that this requires that the class
921 be default-constructible.
923 ****************************************************************************
924 * Important Behavior Changes *
925 ****************************************************************************
929 * The implementation of QPointer has been changed to use QWeakPointer. The
930 old guard mechanism has been removed. This causes a slight change
931 in behavior when using QPointer:
933 * When using QPointer on a QWidget (or a subclass of QWidget), previously
934 the QPointer would be cleared by the QWidget destructor. Now, the QPointer
935 is cleared by the QObject destructor (since this is when QWeakPointers are
936 cleared). Any QPointers tracking a widget will NOT be cleared before the
937 QWidget destructor destroys the children for the widget being tracked.
941 * QUrl has been changed to operate only on percent-encoded
942 forms. Fully-decoded forms, where the percent character stands for itself,
943 are no longer possible. For that reason, the getters and setters with
944 "encoded" in the name are deprecated, except for QUrl::toEncoded() and
947 QUrl now operates in a mode where it decodes as much as it can of the
948 percent-encoding sequences. In addition, the setter methods possess a mode
949 in which a '%' character not part of a percent-encoding sequence will cause
950 the parser to correct the input. Therefore, most software will not require
951 changes to adapt, since the getter methods will continue returning the
952 components in their most-decoded form as they did before and the setter
953 methods will accept input as they did before..
955 The most notable difference is when dealing with
956 QUrl::toString(). Previously, this function would return percent characters
957 in the URL by themselves. Now, it will return "%25", like
962 * Definition of QVariant::UserType changed. Currently it is the same as
963 QMetaType::User, which means that it points to the first registered custom
964 type, instead of a nonexistent type.
968 * Interpretation of QMetaType::Void was changed. Before, in some cases
969 it was returned as an invalid type id, but sometimes it was used as a valid
970 type (C++ "void"). In Qt5, new QMetaType::UnknownType was introduced to
971 distinguish between these two. QMetaType::UnknownType is an invalid type id
972 signaling that a type is unknown to QMetaType, and QMetaType::Void
973 is a valid type id of C++ void type. The difference will be visible for
974 example in call to QMetaType::typeName(), this function will return null for
975 QMetaType::UnknownType and a pointer to "void" string for
977 Please, notice that QMetaType::UnknownType has value 0, which previously was
978 reserved for QMetaType::Void.
983 * The static function QMessageBox::question has changed the default argument
984 for buttons. Before the default was to have an Ok button. That is changed
985 to having a yes and a no button.