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 The build-key is obsolete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 - The old macros TRUE and FALSE have been removed, use true and false instead.
65 - qIsDetached<> has been removed without replacement.
67 - The return type of QFlags<Enum>::operator int() now matches the Enum's underlying
68 type in signedness instead of always being 'int'. This was done in order to allow
69 QFlags over enums whose underlying type is unsigned (Qt::MouseButton is one such
73 * QMetaType::construct() has been renamed to QMetaType::create().
74 * QMetaType::unregisterType() has been removed.
75 * QMetaType now records if the type argument inherits QObject. This
76 can be used in scripting APIs, so that custom QObject subclasses
77 are treated as QObject pointers. In QtScript for example, this can
78 mean that QScriptValue.isQObject can be true where it was false before.
79 * QMetaType::QWidgetStar has been removed. Use qMetaTypeId<QWidget*>()
80 or QVariant::canConvert<QWidget*>() as appropriate.
83 * QMetaMethod::signature() has been renamed to QMetaMethod::methodSignature(),
84 and the return type has been changed to QByteArray. This was done to be able
85 to generate the signature string on demand, rather than always storing it in
87 * QMetaMethod::typeName() no longer returns an empty string when the return
88 type is void; it returns "void". The recommended way of checking whether a
89 method returns void is to compare the return value of QMetaMethod::returnType()
93 * Inconsistent constructor taking Qt::GlobalColor and producing QVariant(QColor)
94 instance was removed. Code constructing such variants can be migrated by
95 explicitly calling QColor constructor. For example from "QVariant(Qt::red)"
96 to "QVariant(QColor(Qt::red))"
97 * Similarly, implicit creation of QVariants from enum values Qt::BrushStyle,
98 Qt::PenStyle, and Qt::CursorShape have been removed. Create objects explicitly
99 or use static_cast<int>(Qt::SolidLine) to create a QVariant of type int with
100 the same value as the enum.
103 * The historical language and country names were updated to their modern values,
104 some deprecated names were dropped or mapped to their modern alternatives.
107 * The plain-text, xml and lightxml test output formats have been changed to
108 show a test result for every row of test data in data-driven tests. In
109 Qt4, only fails and skips were shown for individual data rows and passes
110 were not shown for individual data rows, preventing accurate calculation
111 of test run rates and pass rates.
112 * The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
113 These macros formerly lived in tests/shared/util.h but are now provided
114 by including the <QtTest/QtTest> header. In addition,
115 QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
116 allowing for specifying custom timeout values.
117 * The QTEST_NOOP_MAIN macro has been removed from the API. If a test is
118 known at compile-time to be inapplicable for a particular build it should
119 be omitted via .pro file logic, or the test should call QSKIP in the
120 initTestCase() method to skip the entire test and report a meaningful
121 explanation in the test log.
122 * The DEPENDS_ON macro has been removed from the API. This macro did nothing
123 and misled some users to believe that they could make test functions depend
124 on each other or impose an execution order on test functions.
125 * The QTest::qt_snprintf function has been removed from the API. This was an
126 internal testlib function that was exposed in the public API due to its use
127 in a public macro. Any calls to this function should be replaced by a call
128 to qsnprintf(), which comes from the <QtCore/QByteArray> header.
129 * The QTest::pixmapsAreEqual() function has been removed from the API.
130 Comparison of QPixmap objects should be done using QCOMPARE, which provides
131 more informative output in the event of a failure.
132 * The QSKIP macro no longer has the "mode" parameter, which caused problems
133 for calculating test metrics, as the SkipAll mode hid information about
134 what test data was skipped. Calling QSKIP in a test function now behaves
135 like SkipSingle -- skipping a non-data-driven test function or skipping
136 only the current data row of a data-driven test function. Every skipped
137 data row is now reported in the test log.
138 * The qCompare() function template was both overloaded and specialised, which
139 made it almost impossible to specialise the correct primary template and
140 could lead to indecipherable error messages or surprising overload resolution
141 (such as going via qCompare(QFlags<void*>,int) to satisfy a request for
142 qCompare<void*>()). Now, specialisation has been replaced by overloading.
143 As a consquence, code such as qCompare<QString>(l, r) will no longer use the
144 QString-specific implementation and may fail to compile. We recommend you
145 replace specialisations with overloading, too. Also, don't pass explicit
146 template arguments to qCompare (e.g. qCompare<QString>(l, r)), but let
147 overload resolution pick the correct one, and cast arguments in case of
148 ambiguous overloads (e.g. qCompare(QString(l), r)). The resulting code will
149 continue to work against older QtTestlib versions.
151 - The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .
154 * Internal QAccessible::State enum value HasInvokeExtension removed
155 - QAccessibleInterface:
156 * The "child" integer parameters have been removed. This moves the api
157 to be closer to IAccessible2.
158 This means several functions lose their integer parameter:
159 text(Text t, int child) -> text(Text t), rect(int child) -> rect()
160 setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
161 role(int child) -> role(), state(int child) -> state()
162 * parent() and child() was added in order to do hierarchical navigation.
163 * relations() was added as a replacement to relationTo()
164 * As a consequence of the above two points, navigate() was removed.
165 * Accessible-Action related functions have been removed. QAccessibleInterface
166 subclasses are expected to implement the QAccessibleActionInterface instead.
167 These functions have been removed:
168 QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
169 QAccessibleInterface::doAction
170 - QAccessibleEvent also loses the child parameter.
171 QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
172 QAccessibleEvent::child() removed.
173 - QAccessibleActionInterface:
174 * Refactored to be based on action names. All functions have been changed from using
175 int parameters to strings.
177 - QSound has been moved from QtGui to QtMultimedia
179 - QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
180 as all coordinates are floating point based now.
184 * The DeviceType enum and deviceType() have been deprecated due to
185 the introduction of QTouchDevice.
187 * The signature of the constructor has changed. It now takes a
188 QTouchDevice pointer instead of just a DeviceType value.
190 * TouchPointState no longer includes TouchPointStateMask and
191 TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
194 * QWidget *widget() has been removed and is replaced by QObject
195 *target() in order to avoid QWidget dependencies.
197 * QEvent::TouchCancel has been introduced. On systems where it makes
198 sense this event type can be used to differentiate between a
199 regular TouchEnd and abrupt touch sequence cancellations caused by
200 the compositor, for example when a system gesture gets recognized.
204 * Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
205 cases where a forward declared type should be used as a metatype,
206 Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
207 * Similarly, Q_DECLARE_METATYPE(QSharedPointer<Foo>), and
208 Q_DECLARE_METATYPE(QWeakPointer<Foo>) require Foo to be fully defined. Again
209 though, Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
213 * The signature of the createEditor and valuePropertyName methods
214 have been changed to take arguments of type int instead of QVariant::Type.
216 - QModelIndex/QAbstractItemModel
218 * The integer value that can be stored in a QModelIndex is now of type
219 quintptr to match the size of the internal storage location.
220 * The createIndex() method now only provides the void* and quintptr
221 overloads, making calls with a literal 0 (createIndex(row, col, 0))
222 ambiguous. Either cast (quintptr(0)) or omit the third argument
223 (to get the void* overload).
225 - QWindowSystemInterface:
227 * The signature of all handleTouchEvent() variants have changed,
228 taking a QTouchDevice* instead of just a DeviceType value.
229 Platform or generic plug-ins have to create and register at least
230 one QTouchDevice before sending the first touch event.
232 * The event type parameter is removed from handleTouchEvent().
234 - The previously exported function qt_translateRawTouchEvent() has been removed.
235 Use QWindowSystemInterface::handleTouchEvent() instead.
237 - QAbstractEventDispatcher
239 * The signature for the pure-virtual registerTimer() has changed. Subclasses
240 of QAbstractEventDispatcher will need to be updated to reimplement the new
241 pure-virtual 'virtual void registerTimer(int timerId, int interval,
242 Qt::TimerType timerType, QObject *object) = 0;'
244 * QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
245 now a struct with 3 members: struct TimerInfo { int timerId; int interval;
246 Qt::TimerType timerType; }; Reimplementations of
247 QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
248 3 arguments to the TimerInfo constructor (instead of 2).
252 * Removed implicit conversion operator QUuid::operator QString(), instead
253 QUuid::toString() function should be used.
255 - The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
256 been removed, QNetworkAccessManager should be used instead.
258 - The QFtp and QUrlInfo classes are no longer exported, QNetworkAccessManager should be used
259 instead. These classes are available in a separate module, qtftp.
263 * On Windows, QProcess::ForwardedChannels will not forward the output of GUI
264 applications anymore, if they do not create a console.
266 - QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
267 connectToHostImplementation() and disconnectFromHostImplementation() don't exist.
269 - QTcpServer::incomingConnection() now takes a qintptr instead of an int.
271 - QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.
273 - QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
274 QDir::toNativeSeparators() instead.
276 - QIconEngineV2 was merged into QIconEngine
277 You might need to adjust your code if it used a QIconEngine.
280 * Projects which explicitly set an empty TARGET are considered broken now.
281 * The makespec and .qmake.cache do not see build pass specific variables any more.
282 * load()/include() with a target namespace and infile()/$$fromfile() now start with
283 an entirely pristine context.
284 * Configure's -sysroot and -hostprefix are now handled slightly differently.
285 The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
286 the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
287 The new QT_HOST_... properties can be used to refer to the Qt host tools.
288 * Several functions and built-in variables were modified to return normalized paths.
289 * The -(no-)exception flags in configure have been removed. Qt modules are now compiled
290 without exceptions by default, as they do not use them and can neither handle them
291 properly. Qt Core still has exceptions enabled to correctly throw bad_alloc exceptions
293 Whether code should be compiled with exception support enabled or disabled can be
294 controlled by a CONFIG += exceptions/exceptions_off setting in the .pro file.
296 - QTextCodecPlugin has been removed since it is no longer used. All text codecs
297 are now built into QtCore.
299 - QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
300 to use or check both.
302 - QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
303 QAbstractFileEngineHandler were removed from public API and are no longer
304 exported. They may temporarily live as private implementation details, but
305 they may be altogether dropped or otherwise changed at will in the future.
308 * toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
309 longer take a parameter for base, they will only perform localised base 10
310 conversions. For converting other bases use the QString methods instead.
312 - QSystemLocale has been removed from the public API.
314 - QSqlQueryModel::indexInQuery() is now virtual. See note below under QtSql.
316 - QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
317 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
318 are now virtual. See note below under QtSql.
320 - qMacVersion() has been removed. Use QSysInfo::macVersion() or
321 QSysInfo::MacintoshVersion instead.
323 - QColorDialog::customColor() now returns a QColor value instead of QRgb.
324 QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
325 take a QColor value for their second parameter instead of QRgb.
327 - QPageSetupDialog has had the PageSetupDialogOption enum and the api to
328 set and get the enum removed as none of the Options are used any more.
330 - QAbstractPageSetupDialog has been removed.
332 - QThread::terminated() has been removed, since its emission cannot be guaranteed.
334 - QPrintEngine - Removed the PPK_SuppressSystemPrintStatus key as no longer used.
336 - QCoreApplication::Type and QApplication::type() have been removed. These
337 Qt3 legacy application types did not match the application types
338 available in Qt5. Use for example qobject_cast instead to dynamically
339 find out the exact application type.
341 - The following QStyle implementations have been made internal:
346 * QWindowsMobileStyle
350 Instead of creating instances or inheriting these classes directly, use:
351 * QStyleFactory for creating instances of specific styles
352 * QProxyStyle for customizing existing style implementations
353 * QCommonStyle as a base for implementing full custom styles.
355 ****************************************************************************
357 ****************************************************************************
362 - The directory structure of the qtbase unit-tests has been reworked to
363 more closely match the directory structure of the code under test.
364 Integration tests have been moved to tests/auto/integrationtests.
366 - Qt is compiled with C++11 support enabled by default, provided the compiler
367 supports C++11. Qmake based projects can enable C++11 support explicitly
368 using 'CONFIG+=c++11' in their .pro files. To enable it conditionally, use
369 'contains(QT_CONFIG,c++11):CONFIG+=c++11'. This will enable C++11 support
370 only if Qt was built with C++11 support.
372 - The Unicode Data and Algorithms has been updated to match the
373 Unicode Standard of version 6.2. For more information see http://www.unicode.org/
375 - The QLocale data has been updated to CLDR 22.1.
376 For more information see http://cldr.unicode.org/
378 Third party components
379 ----------------------
381 - SQLITE_ENABLE_FTS3,SQLITE_ENABLE_FTS3_PARENTHESIS and SQLITE_ENABLE_RTREE
382 flags are now enabled by default on all platforms, for the sqlite3 copy under
383 the 3rdparty directory.
388 - Copyright of Qt has been transferred to Digia Plc.
390 ****************************************************************************
392 ****************************************************************************
396 * [QTBUG-12144], [QTBUG-18360] The QChar methods are now able to handle the full range
397 of Unicode codepoints defined by the Unicode Standard of version 6.2.
398 QChar::isPrint() will no longer return a false positives for
399 the Unicode format characters, surrogates, and private use characters.
401 * Drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
402 value is returned for an unassigned codepoints now.
404 * layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
405 layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
406 should now also connect to (and disconnect from) the rowsAboutToBeMoved and
409 * The QAbstractItemModel::sibling method was made virtual, allowing implementations
410 to optimize based on internal data.
412 * The default value of the property QSortFilterProxyModel::dynamicSortFilter was
413 changed from false to true.
415 * The signature of the virtual QAbstractItemView::dataChanged method has changed to
416 include the roles which have changed. The signature is consistent with the dataChanged
419 * QFileSystemWatcher is now able to return failure in case of errors whilst
420 altering the watchlist in both the singular and QStringList overloads of
421 addPath and removePath.
423 * QString::mid, QString::midRef and QByteArray::mid, if the position passed
424 is equal to the length (that is, right after the last character/byte),
425 now return an empty QString, QStringRef or QByteArray respectively.
426 in Qt 4 they returned a null QString or a null QStringRef.
428 * QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
429 toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
430 default or system locale, they will always use the C locale. This is to
431 guarantee consistent default conversion of strings. For locale-aware conversions
432 use the equivalent QLocale methods.
434 * QDate, QTime, and QDateTime have undergone important behavioural changes:
435 * QDate only implements the Gregorian calendar, the switch to the Julian
436 calendar before 1582 has been removed. This means all QDate methods will
437 return different results for dates prior to 15 October 1582, and there is
438 no longer a gap between 4 October 1582 and 15 October 1582.
439 * QDate::setYMD() is deprecated, use QDate::setDate() instead
440 * Most methods now apply strict validity checks and will return appropriate
441 and consistent values when invalid. For example, QDate::year() will return
442 0 and QDate::shortMonthName() will return QString().
443 * Adding days to a null QDate or seconds to a null QTime will no longer return
445 * QDate stores the Julian Day as a qint64 extending date support across a
446 more interesting range, see the class documentation for details.
447 * Conversion to YMD form dates is only accurate between to 4800 BCE to
449 * The QDate::addDays() and QDateTime::addDays() methods now take a qint64
450 * The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64
452 * QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
453 been removed. This was removed due to issues with breaking other code from
454 libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
455 extent) performance issues.
457 * QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed.
458 QObject::trUtf8 and QCoreApplication::Encoding enum are now obsolete. Qt assumes
459 that the source code is encoded in UTF-8.
461 * QFile::setEncodingFunction and QFile::setDecodingFunction are obsolete and do
462 nothing in Qt 5. The QFile::encodeName and QFile::decodeName functions are now
463 hardcoded to operate on QString::fromLocal8Bit and QString::toLocal8Bit
464 only. Therefore, it's still possible to obtain the old behaviour by calling
465 QTextCodec::setCodecForLocale. However, that is not recommended: new code
466 should not make assumptions about the filesystem encoding and older code should
467 have those assumptions removed.
469 * QIntValidator and QDoubleValidator no longer fall back to using the C locale if
470 the requested locale fails to validate the input.
472 * A new set of classes for doing pattern matching with Perl-compatible regular
473 expressions has been added: QRegularExpression, QRegularExpressionMatch and
474 QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
475 powerful and flexible regular expression engine.
477 * QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
478 * The enum values simply didn't make sense in the first place and should simply be dropped.
480 * Filtering of native events (QCoreApplication::setEventFilter, as well as
481 QApplication::x11EventFilter/macEventFilter/qwsEventFilter/winEventFilter) have been replaced
482 with QCoreApplication::installNativeEventFilter and removeNativeEventFilter,
483 for an API much closer to QEvent filtering. Note that the native events that can be
484 filtered this way depend on which QPA backend is chosen, at runtime. On X11, XEvents are
485 not used anymore, and have been replaced with xcb_generic_event_t due to the switch to
486 XCB, which requires porting the application code to XCB as well.
488 * [QTBUG-23529] QHash is now more resilient to a family of denial of service
489 attacks exploiting algorithmic complexity, by supporting two-arguments overloads
490 of the qHash() hashing function.
492 * [QTBUG-4844] QObject::disconnectNotify() is now called when a receiver is destroyed.
495 - [QTBUG-15430] Added a QStateMachine constructor that takes a ChildMode parameter.
496 - [QTBUG-17975] Delayed event posting now works from secondary threads.
497 - [QTBUG-19789] Signal transitions now work correctly when the sender is in a different thread.
498 - [QTBUG-20362] Property assignments now work as expected with nested, parallel states.
499 - [QTBUG-22931] The root state can now be a parallel state group.
500 - [QTBUG-24307] The initial state is now entered before the started() signal is emitted.
501 - [QTBUG-25959] State entry and exit order is now SCXML spec-compliant.
503 * qDebug(), qWarning(), qCritical(), and qFatal() were changed to macros that track the origin
504 of the message in source code. Whether this and other meta-information is printed can be
505 configured (for the default message handler) by setting the new QT_MESSAGE_PATTERN environment
506 variable. qInstallMsgHandler() has been deprecated, and should be replaced with
507 qInstallMessageHandler().
509 * QTextBoundaryFinder
510 - [QTBUG-6498] The word start and word end boundaries detection is now
511 unaware of surrounding white space characters.
512 - SoftHyphen enum value has been added to specify a line break opportunity
513 at a soft hyphen (SHY) character.
514 - MandatoryBreak enum value has been added to specify a mandatory (aka "hard") line breaks.
515 - Source-incompatible change: Since the behavior of boundaryReasons() method
516 has been changed a lot, StartWord/EndWord enum values were intentionally replaced
517 with StartOfItem/EndOfItem ones to force the affected code be revised.
519 * Softkeys API was removed. The following functions and enums were removed:
520 - QAction::setSoftKeyRole()
521 - QAction::softKeyRole()
522 - QAction::SoftKeyRole
523 - Qt::WA_MergeSoftkeys
524 - Qt::WA_MergeSoftkeysRecursively
525 - Qt::WindowSoftkeysVisibleHint
526 - Qt::WindowSoftkeysRespondHint
529 - [QTBUG-27987] Constructing a QLocale object with the short locale id has been improved.
532 - Added overloads of connect() to connect using pointers to member function
533 - Added QObject::isSignalConnected()
537 * Accessibility has been refactored. The hierachy of accessible objects is implemented via
538 proper parent/child functions instead of using navigate which has been deprecated for this purpose.
539 Table and cell interfaces have been added to qaccessible2.h
541 * Touch events and points have been extended to hold additional
542 information like capability flags, point-specific flags, velocity,
545 * A new set of enabler classes have been added, most importantly QWindow, QScreen,
546 QSurfaceFormat, and QOpenGLContext.
548 * Most of the useful QtOpenGL classes have been polished and moved into
549 QtGui. See QOpenGLFramebufferObject, QOpenGLShaderProgram,
550 QOpenGLFunctions, etc.
552 * QOpenGLPaintDevice has been added to be able to use QPainter to render into
553 the currently bound context.
555 * Behavioral change in QImage::fill() on an image with format Format_RGB888:
556 For consistency with RGB32 and other 32-bit formats, function now expects
557 image data in RGB layout as opposed to BGR layout.
559 * Behavioral change in QImage and QPixmap load()/loadFromData() on a non-null image:
560 If load() or loadFromData() fails to load the image (returns false) then
561 the existent image data will be invalidated, so that isNull() is guaranteed
562 to return true in this case.
564 * Behavioral change regarding QPainter fill rules when not using antialiased
565 painting: The fill rules have changed so that the aliased and antialiased
566 coordinate systems match. Earlier there used to be an offset of slightly less
567 than half a pixel when doing sub-pixel rendering, in order to be consistent
568 with the old X11 paint engine. The new behavior should be more predictable and
569 gives the same consistent rounding for images / pixmaps as for paths and
570 rectangle filling. It's possible to still get the old behavior by setting the
571 QPainter::Qt4CompatiblePainting render hint.
573 * Behavioral change regarding QPen: The default QPen constructors now create a
574 1-width non-cosmetic pen as opposed to a 0-width cosmetic pen. The old
575 behavior can be emulated by setting the QPainter::Qt4CompatiblePainting
576 render hint when painting.
580 * A new style QFusionStyle has been introduced, while QPlastiqueStyle, QCleanlooksStyle,
581 QCDEStyle and QMotifStyle have been removed. The older styles will be
582 made available to applications as a standalone source package.
584 * QInputContext removed as well as related getters and setters on QWidget and QApplication.
585 Input contexts are now platform specific.
587 * QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.
589 * In Qt 4, QStyle::standardIconImplementation() and layoutSpacingImplementation()
590 were introduced instead of making the corresponding methods virtual due to binary
591 compatibility reasons. QStyle::standardIcon() and layoutSpacing() have been made
592 (pure) virtual in Qt 5.
594 * In Qt 4, many QStyleOption subclasses were introduced in order to keep
595 binary compatibility -- QStyleOption was designed to be extended this way,
596 in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
597 classes have been removed, and their members merged into the respective
598 base classes. Those classes were left as typedefs to keep existing code
599 working. Still, some minor adjustements could be necessary, especially in code
600 that uses QStyleOption directly and does not initialize all the members using
601 the proper Qt API: due to the version bump, QStyle will try to use the additional
602 QStyleOption members, which are left default-initialized.
604 * QHeaderView has been refactored and the following functions have been obsoleted:
606 * void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.
608 * bool isMovable() const - use bool sectionsMovable() const instead.
610 * void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.
612 * bool isClickable() const - use bool sectionsClickable() instead.
614 * void setResizeMode(int logicalindex, ResizeMode mode) -
615 use setSectionResizeMode(logicalindex, mode) instead.
617 * ResizeMode resizeMode(int logicalindex) const -
618 use sectionResizeMode(int logicalindex) instead.
620 * setSortIndicator will no longer emit sortIndicatorChanged when the sort indicator is unchanged.
622 * QDateEdit and QTimeEdit have re-gained a USER property. These were originally removed
623 before Qt 4.7.0, and are re-added for 5.0. This means that the userProperty for
624 those classes are now QDate and QTime respectively, not QDateTime as they have been
625 for the 4.7 and 4.8 releases.
627 * QGraphicsItem and derived classes - Passing a QGraphicsScene in the items constructor
628 is no longer supported. Construct the item without a scene and then call
629 QGraphicsScene::addItem() to add the item to the scene.
631 * QAbstractItemView and derived classes only emit the clicked() signal on left click now,
632 instead of on all mouse clicks.
634 * QProxyModel has been removed. It is deprecated since early Qt 4 versions and replaced
635 by QAbstractProxyModel and related classes. A copy of QProxyModel is available
636 in the UiHelpers library.
638 * The virtual methods QApplication::commitData and QApplication::saveState, used for session
639 management, no longer exist.
640 Connect to the commitDataRequest and saveStateRequest signals instead.
641 The new isSessionSaving() method can be used in the cases where the closeEvent of your
642 window needs to know whether it is being called during shutdown.
644 * [QTBUG-20503] QFileSystemModel no longer masks out write permissions from the permissions
645 returned from permissions() or data(FilePermissions), even if in read-only mode
646 (QFileSystemModel::isReadOnly()).
648 * [QTBUG-158 QTBUG-428 QTBUG-26501] QComboBox::currentText improvements
649 Restored currentText as USER property.
650 New setter setCurrentText(), marked as WRITE method, usable by QItemDelegate and QDataWidgetMapper.
651 New signal currentTextChanged() marked as NOTIFY method.
655 * QHostAddress::isLoopback() API added. Returns true if the address is
656 one of the IP loopback addresses.
658 * QSslCertificate::serialNumber() now always returns the serial number in
661 * The openssl network backend now reads the ssl configuration file allowing
662 the use of openssl engines.
666 * QtDBus now generates property annotations for the Qt type names
667 in the org.qtproject.QtDBus namespace. When parsing such annotations
668 both the old and new namespaces are accepted.
670 * QtDBus error codes have been updated to be on the org.qtproject.QtDBus.Error
676 * QtConcurrent is no longer in QtCore, but forms its own library now.
677 QMake-based projects can use
679 to include the new library.
681 * QtConcurrent::Exception has been renamed to QException, and is still in QtCore.
682 Ditto QtConcurrent::UnhandledException.
687 * Most of the classes in this module (with the notable exception of QGLWidget)
688 now have equivalents in QtGui, along with the naming change QGL -> QOpenGL.
689 The classes in QtOpenGL that have equivalents in QtGui can now be considered
691 * QGLPixelBuffer is now deprecated and implemented in terms of a hidden
692 QGLWidget and a QOpenGLFramebufferObject. It is recommended that applications
693 using QGLPixelBuffer for offscreen rendering to a texture switch to using
694 QOpenGLFramebufferObject directly instead, for improved performance.
695 * The default major version of QGLFormat has been changed to 2 to be aligned
696 with QSurfaceFormat. Applications that want to use a different version should
697 explicitly request it using QGLFormat::setVersion().
698 * void QGLContext::generateFontDisplayLists(const QFont& font, int listBase)
699 and int QGLWidget::fontDisplayListBase(const QFont & fnt, int listBase)
700 which were deprecated in Qt 4 have been removed.
701 * Previously deprecated default value listBase parameter has been removed from
702 both QGLWidget::renderText() functions.
703 * In order to ensure support on more platforms, stricter requirements have been
704 introduced for doing threaded OpenGL. First, you must call makeCurrent() at
705 least once per swapBuffers() call, so that the platform has a chance to
706 synchronize resizes to the OpenGL surface. Second, before doing makeCurrent()
707 or swapBuffers() in a separate thread, you must call
708 QGLContext::moveToThread(QThread *) to explicitly let Qt know in which thread
709 a QGLContext is currently being used. You also need to make sure that the
710 context is not current in the current thread before moving it to a different
715 * [QTBUG-2124] Added default conversion for long and unsigned long.
716 * [QTBUG-6133] Fixed QScriptContextInfo::functionMetaIndex() for overloaded
718 * [QTBUG-15213] Doc: Added missing properties to the ECMAScript reference.
719 * [QTBUG-15956] Doc: Removed wrong information about Error .stack properties.
720 * [QTBUG-17915] Fixed a crash when a JS property descriptor was only partially
722 * [QTBUG-18188] Fixed a regression that caused contexts created by
723 QScriptEngine::pushContext() to inherit the parent context's scope.
724 * [QTBUG-18201] Suppressed 'LEAK' messages on stderr at application exit.
725 * [QTBUG-20378] Fixed QtScriptTools compilation when some features are disabled.
726 * [QTBUG-20845] Fixed a precision bug in the calculator example.
727 * [QTBUG-21548] Fixed a crash in QScriptEngineDebugger when the QScriptEngine
728 being debugged was deleted.
729 * [QTBUG-21760] Fixed a crash when accessing QObject properties through an
731 * [QTBUG-21896] Fixed a crash when converting an invalid JS value to a string.
732 * [QTBUG-21993] Fixed a bug that caused QObject wrapper objects created with
733 the PreferExistingWrapperObject option to not be garbage collected, even if
734 the object was not referenced anywhere in the scripting environment.
735 * [QTBUG-22152] Fixed build issue on Solaris.
736 * [QTBUG-23871] Fixed a JIT crash on x86-64 caused by out-of-range branch
738 * [QTBUG-26261] Fixed a crash when a queued signal handler no longer existed.
739 * [QTBUG-26590] Fixed a bug that caused QObjects with script connections to
740 not be garbage collected as expected.
744 * [QTBUG-20615] Autotests can now log test output to multiple destinations
745 and log formats simultaneously.
746 * [QTBUG-21645] QSignalSpy now handles QVariant signal parameters more
747 intuitively; the QVariant value is copied directly, instead of being
748 wrapped inside a new QVariant. This means that calling
749 qvariant_cast<QVariant>() on the QSignalSpy item (to "unwrap" the value)
750 is no longer required (but still works).
754 QSqlQueryModel/QSqlTableModel/QSqlRelationalTableModel
756 * The dataChanged() signal is now emitted for changes made to an inserted
757 record that has not yet been committed. Previously, dataChanged() was
758 suppressed in this case for OnRowChange and OnFieldChange. This was probably
759 an attempt to avoid trouble if setData() was called while handling
760 primeInsert(). By emitting dataChanged(), we ensure that all views are aware
763 * While handling primeInsert() signal, the record must be manipulated using
764 the provided reference. Do not attempt to manipulate the records using the
765 model methods setData() or setRecord().
767 * removeRows() no longer emits extra beforeDelete signal for out of range row.
769 * removeRows() now requires the whole range of targetted rows to be valid
770 before doing anything. Previously, it would remove what it could and
771 ignore the rest of the range.
773 * removeRows(), for OnFieldChange and OnRowChange, allows only 1 row to be
774 removed and only if there are no other changed rows.
776 * setRecord() and insertRecord()
777 -The generated flags from the source record are preserved in the model
778 and determine which fields are included when changes are applied to
780 -Require all fields to map correctly. Previously fields that didn't
781 map were simply ignored.
782 -For OnManualSubmit, insertRecord() no longer leaves behind an empty
783 row if setRecord() fails.
784 -setRecord() now automatically submits for OnRowChange.
786 * QSqlQueryModel::indexInQuery() is now virtual. See
787 QSqlTableModel::indexInQuery() as example of how to implement in a
790 * QSqlQueryMode::setQuery() emits fewer signals. The modelAboutToBeReset()
791 and modelReset() signals suffice to inform views that they must reinterrogate
794 * QSqlTableModel::select() is now a slot.
796 * QSqlTableModel::selectRow(): This is a new slot that refreshes a single
797 row in the model from the database.
799 * QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
800 Previously, after changes were submitted in these edit strategies, select()
801 was called which removed and inserted all rows. This ruined navigation
802 in QTableView. Now, with these edit strategies, there is no implicit select()
803 done after committing. This includes deleted rows which remain in
804 the model as blank rows until the application calls select(). Instead,
805 selectRow() is called to refresh only the affected row.
807 * QSqlTableModel::isDirty(): New overloaded method to check whether model
808 has any changes to submit. QTBUG-3108
810 * QSqlTableModel::setData() and setRecord() no longer revert pending changes
811 that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
812 Instead, pending (failed) changes cause new changes inappropriate to the
813 edit strategy to be refused. The application should resolve or revert pending
814 changes. insertRows() and insertRecord() also respect the edit strategy.
816 * QSqlTableModel::setData() and setRecord() in OnRowChange no longer have the
817 side effect of submitting the cached row when invoked on a different row.
819 * QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
820 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
821 are now virtual. Their xxxImplemenation counterparts have been removed
822 now that QSqlDriver subclasses can reimplement these directly.
824 ****************************************************************************
826 ****************************************************************************
830 * QVariant::Bool type now mapped to integers 0/1 in SQL instead of strings
831 'true' and 'false'. Sqlite does not have a boolean column type and it is
832 customary to use integer. QTBUG-23895
836 * the error message returned in QSqlError::text() has the SQLSTATE error code
837 appended in parantheses.
839 ****************************************************************************
840 * Platform Specific Changes *
841 ****************************************************************************
849 * Accessibility framework uses IAccessible2
850 * ANGLE can be used to provide Open GL ES 2.0 (see http://code.google.com/p/angleproject/)
856 Qt for Embedded Linux
857 ---------------------
864 ****************************************************************************
865 * Compiler Specific Changes *
866 ****************************************************************************
869 ****************************************************************************
871 ****************************************************************************
875 * Remove qttest_p4.prf file. From now on we should explicitly enable the
876 things from it which we want. Autotest .pro files should stop using
877 'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.
882 * [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
883 translation attributes which apply to all items.
884 They are by default translatable.
893 * [QTBUG-20785] The moc now has a -b<file> option to #include an additional
894 file at the beginning of the generated file.
895 * moc is now able to fully understand and expands preprocessor macros.
905 * QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
911 * The Mac OS X -dwarf2 configure argument has been removed. DWARF2 is always
912 used on Mac OS X now.
917 ****************************************************************************
919 ****************************************************************************
920 - The text codecs that were previously plugins are now built into QtCore.
921 - Code using Q_EXPORT_PLUGIN macros will no longer compile. Use
922 Q_PLUGIN_METADATA instead. Note that this requires that the class
923 be default-constructible.
925 ****************************************************************************
926 * Important Behavior Changes *
927 ****************************************************************************
931 * The implementation of QPointer has been changed to use QWeakPointer. The
932 old guard mechanism has been removed. This causes a slight change
933 in behavior when using QPointer:
935 * When using QPointer on a QWidget (or a subclass of QWidget), previously
936 the QPointer would be cleared by the QWidget destructor. Now, the QPointer
937 is cleared by the QObject destructor (since this is when QWeakPointers are
938 cleared). Any QPointers tracking a widget will NOT be cleared before the
939 QWidget destructor destroys the children for the widget being tracked.
943 * QUrl has been changed to operate only on percent-encoded
944 forms. Fully-decoded forms, where the percent character stands for itself,
945 are no longer possible. For that reason, the getters and setters with
946 "encoded" in the name are deprecated, except for QUrl::toEncoded() and
949 QUrl now operates in a mode where it decodes as much as it can of the
950 percent-encoding sequences. In addition, the setter methods possess a mode
951 in which a '%' character not part of a percent-encoding sequence will cause
952 the parser to correct the input. Therefore, most software will not require
953 changes to adapt, since the getter methods will continue returning the
954 components in their most-decoded form as they did before and the setter
955 methods will accept input as they did before..
957 The most notable difference is when dealing with
958 QUrl::toString(). Previously, this function would return percent characters
959 in the URL by themselves. Now, it will return "%25", like
964 * Definition of QVariant::UserType changed. Currently it is the same as
965 QMetaType::User, which means that it points to the first registered custom
966 type, instead of a nonexistent type.
970 * Interpretation of QMetaType::Void was changed. Before, in some cases
971 it was returned as an invalid type id, but sometimes it was used as a valid
972 type (C++ "void"). In Qt5, new QMetaType::UnknownType was introduced to
973 distinguish between these two. QMetaType::UnknownType is an invalid type id
974 signaling that a type is unknown to QMetaType, and QMetaType::Void
975 is a valid type id of C++ void type. The difference will be visible for
976 example in call to QMetaType::typeName(), this function will return null for
977 QMetaType::UnknownType and a pointer to "void" string for
979 Please, notice that QMetaType::UnknownType has value 0, which previously was
980 reserved for QMetaType::Void.
985 * The static function QMessageBox::question has changed the default argument
986 for buttons. Before the default was to have an Ok button. That is changed
987 to having a yes and a no button.