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 ****************************************************************************
14 - QAtomicInt's and QAtomicPointer's non-atomic convenience methods
15 (i.e., operator=, operator int / operator T*, operator!, operator==,
16 operator!= and operator->) have been removed as they did implicit
17 loads and stores of unspecified memory ordering. Code dealing with
18 is expected to use load(), loadAquire(), store() and storeRelease()
22 * The signatures of the connectNotify() and disconnectNotify() functions
23 have changed. The functions now get passed a QMetaMethod that identifies
24 the signal, rather than a const char *.
26 - QSslCertificate::subjectInfo() and QSslCertificate::issuerInfo() now
27 return a QStringList instead of a QString
29 - QSslCertificate::isValid() has been deprecated. Originally it only checked
30 the certificate dates, but later checking for blacklisting was added. Now
31 there's a more specific QSslCertificate::isBlacklisted() method.
33 - Unite clipping support has been removed from QPainter. The alternative is
34 to unite QRegion's and using the result on QPainter.
36 - QLibrary::resolve() now returns a function pointer instead of a void
39 - QSslCertificate::alternateSubjectNames() is deprecated (but can be enabled
40 via QT_DISABLE_DEPRECATED_BEFORE), use
41 QSslCertificate::subjectAlternativeNames() instead.
43 - QLibraryInfo::buildKey() has been removed. Likewise, the QT_BUILD_KEY
44 preprocessor #define has also been removed. The build-key is obsolete
45 and is no longer necessary.
47 - QCoreApplication::translate() will no longer return the source text when
48 the translation is empty. Use lrelease -removeidentical for optimization.
50 - QTranslator subclasses need to adjust the signature of the virtual method
51 translate() in order to add the "int n = -1" argument.
53 - QString and QByteArray constructors that take a size argument will now treat
54 negative sizes to indicate nul-terminated strings (a nul-terminated array of
55 QChar, in the case of QString). In Qt 4, negative sizes were ignored and
56 result in empty QString and QByteArray, respectively. The size argument to
57 those constructors now has a default value of -1, thus replacing the separate
58 constructors that did the same.
60 - Qt::escape() is deprecated (but can be enabled via
61 QT_DISABLE_DEPRECATED_BEFORE), use QString::toHtmlEscaped() instead.
63 - QBool is gone. QString::contains, QByteArray::contains, and QList::contains
64 used to return an internal QBool class so that the Qt3 code
65 "if (a.contains() == 2)" wouldn't compile anymore. Such code cannot exist
66 in Qt4, so these methods return a bool now. If your code used the undocumented
67 QBool, simply replace it with bool.
69 - The old macros TRUE and FALSE have been removed, use true and false instead.
71 - qIsDetached<> has been removed without replacement.
73 - The return type of QFlags<Enum>::operator int() now matches the Enum's underlying
74 type in signedness instead of always being 'int'. This was done in order to allow
75 QFlags over enums whose underlying type is unsigned (Qt::MouseButton is one such
79 * QMetaType::construct() has been renamed to QMetaType::create().
80 * QMetaType::unregisterType() has been removed.
81 * QMetaType now records if the type argument inherits QObject. This
82 can be used in scripting APIs, so that custom QObject subclasses
83 are treated as QObject pointers. In QtScript for example, this can
84 mean that QScriptValue.isQObject can be true where it was false before.
85 * QMetaType::QWidgetStar has been removed. Use qMetaTypeId<QWidget*>()
86 or QVariant::canConvert<QWidget*>() as appropriate.
89 * QMetaMethod::signature() has been renamed to QMetaMethod::methodSignature(),
90 and the return type has been changed to QByteArray. This was done to be able
91 to generate the signature string on demand, rather than always storing it in
93 * QMetaMethod::typeName() no longer returns an empty string when the return
94 type is void; it returns "void". The recommended way of checking whether a
95 method returns void is to compare the return value of QMetaMethod::returnType()
99 * Inconsistent constructor taking Qt::GlobalColor and producing QVariant(QColor)
100 instance was removed. Code constructing such variants can be migrated by
101 explicitly calling QColor constructor. For example from "QVariant(Qt::red)"
102 to "QVariant(QColor(Qt::red))"
103 * Similarly, implicit creation of QVariants from enum values Qt::BrushStyle,
104 Qt::PenStyle, and Qt::CursorShape have been removed. Create objects explicitly
105 or use static_cast<int>(Qt::SolidLine) to create a QVariant of type int with
106 the same value as the enum.
109 * The historical language and country names were updated to their modern values,
110 some deprecated names were dropped or mapped to their modern alternatives.
113 * The plain-text, xml and lightxml test output formats have been changed to
114 show a test result for every row of test data in data-driven tests. In
115 Qt4, only fails and skips were shown for individual data rows and passes
116 were not shown for individual data rows, preventing accurate calculation
117 of test run rates and pass rates.
118 * The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
119 These macros formerly lived in tests/shared/util.h but are now provided
120 by including the <QtTest/QtTest> header. In addition,
121 QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
122 allowing for specifying custom timeout values.
123 * The QTEST_NOOP_MAIN macro has been removed from the API. If a test is
124 known at compile-time to be inapplicable for a particular build it should
125 be omitted via .pro file logic, or the test should call QSKIP in the
126 initTestCase() method to skip the entire test and report a meaningful
127 explanation in the test log.
128 * The DEPENDS_ON macro has been removed from the API. This macro did nothing
129 and misled some users to believe that they could make test functions depend
130 on each other or impose an execution order on test functions.
131 * The QTest::qt_snprintf function has been removed from the API. This was an
132 internal testlib function that was exposed in the public API due to its use
133 in a public macro. Any calls to this function should be replaced by a call
134 to qsnprintf(), which comes from the <QtCore/QByteArray> header.
135 * The QTest::pixmapsAreEqual() function has been removed from the API.
136 Comparison of QPixmap objects should be done using QCOMPARE, which provides
137 more informative output in the event of a failure.
138 * The QSKIP macro no longer has the "mode" parameter, which caused problems
139 for calculating test metrics, as the SkipAll mode hid information about
140 what test data was skipped. Calling QSKIP in a test function now behaves
141 like SkipSingle -- skipping a non-data-driven test function or skipping
142 only the current data row of a data-driven test function. Every skipped
143 data row is now reported in the test log.
144 * The qCompare() function template was both overloaded and specialised, which
145 made it almost impossible to specialise the correct primary template and
146 could lead to indecipherable error messages or surprising overload resolution
147 (such as going via qCompare(QFlags<void*>,int) to satisfy a request for
148 qCompare<void*>()). Now, specialisation has been replaced by overloading.
149 As a consquence, code such as qCompare<QString>(l, r) will no longer use the
150 QString-specific implementation and may fail to compile. We recommend you
151 replace specialisations with overloading, too. Also, don't pass explicit
152 template arguments to qCompare (e.g. qCompare<QString>(l, r)), but let
153 overload resolution pick the correct one, and cast arguments in case of
154 ambiguous overloads (e.g. qCompare(QString(l), r)). The resulting code will
155 continue to work against older QtTestlib versions.
157 - The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .
160 * Internal QAccessible::State enum value HasInvokeExtension removed
161 - QAccessibleInterface:
162 * The "child" integer parameters have been removed. This moves the api
163 to be closer to IAccessible2.
164 This means several functions lose their integer parameter:
165 text(Text t, int child) -> text(Text t), rect(int child) -> rect()
166 setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
167 role(int child) -> role(), state(int child) -> state()
168 * parent() and child() was added in order to do hierarchical navigation.
169 * relations() was added as a replacement to relationTo()
170 * As a consequence of the above two points, navigate() was removed.
171 * Accessible-Action related functions have been removed. QAccessibleInterface
172 subclasses are expected to implement the QAccessibleActionInterface instead.
173 These functions have been removed:
174 QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
175 QAccessibleInterface::doAction
176 - QAccessibleEvent also loses the child parameter.
177 QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
178 QAccessibleEvent::child() removed.
179 - QAccessibleActionInterface:
180 * Refactored to be based on action names. All functions have been changed from using
181 int parameters to strings.
183 - QSound has been moved from QtGui to QtMultimedia
185 - QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
186 as all coordinates are floating point based now.
190 * The DeviceType enum and deviceType() have been deprecated due to
191 the introduction of QTouchDevice.
193 * The signature of the constructor has changed. It now takes a
194 QTouchDevice pointer instead of just a DeviceType value.
196 * TouchPointState no longer includes TouchPointStateMask and
197 TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
200 * QWidget *widget() has been removed and is replaced by QObject
201 *target() in order to avoid QWidget dependencies.
203 * QEvent::TouchCancel has been introduced. On systems where it makes
204 sense this event type can be used to differentiate between a
205 regular TouchEnd and abrupt touch sequence cancellations caused by
206 the compositor, for example when a system gesture gets recognized.
210 * Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
211 cases where a forward declared type should be used as a metatype,
212 Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
213 * Similarly, Q_DECLARE_METATYPE(QSharedPointer<Foo>), and
214 Q_DECLARE_METATYPE(QWeakPointer<Foo>) require Foo to be fully defined. Again
215 though, Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
219 * The signature of the createEditor and valuePropertyName methods
220 have been changed to take arguments of type int instead of QVariant::Type.
222 - QModelIndex/QAbstractItemModel
224 * The integer value that can be stored in a QModelIndex is now of type
225 quintptr to match the size of the internal storage location.
226 * The createIndex() method now only provides the void* and quintptr
227 overloads, making calls with a literal 0 (createIndex(row, col, 0))
228 ambiguous. Either cast (quintptr(0)) or omit the third argument
229 (to get the void* overload).
231 - QWindowSystemInterface:
233 * The signature of all handleTouchEvent() variants have changed,
234 taking a QTouchDevice* instead of just a DeviceType value.
235 Platform or generic plug-ins have to create and register at least
236 one QTouchDevice before sending the first touch event.
238 * The event type parameter is removed from handleTouchEvent().
240 - The previously exported function qt_translateRawTouchEvent() has been removed.
241 Use QWindowSystemInterface::handleTouchEvent() instead.
243 - QAbstractEventDispatcher
245 * The signature for the pure-virtual registerTimer() has changed. Subclasses
246 of QAbstractEventDispatcher will need to be updated to reimplement the new
247 pure-virtual 'virtual void registerTimer(int timerId, int interval,
248 Qt::TimerType timerType, QObject *object) = 0;'
250 * QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
251 now a struct with 3 members: struct TimerInfo { int timerId; int interval;
252 Qt::TimerType timerType; }; Reimplementations of
253 QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
254 3 arguments to the TimerInfo constructor (instead of 2).
258 * Removed implicit conversion operator QUuid::operator QString(), instead
259 QUuid::toString() function should be used.
261 - The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
262 been removed, QNetworkAccessManager should be used instead.
264 - The QFtp and QUrlInfo classes are no longer exported, QNetworkAccessManager should be used
265 instead. These classes are available in a separate module, qtftp.
269 * On Windows, QProcess::ForwardedChannels will not forward the output of GUI
270 applications anymore, if they do not create a console.
272 - QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
273 connectToHostImplementation() and disconnectFromHostImplementation() don't exist.
275 - QTcpServer::incomingConnection() now takes a qintptr instead of an int.
277 - QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.
279 - QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
280 QDir::toNativeSeparators() instead.
282 - QIconEngineV2 was merged into QIconEngine
283 You might need to adjust your code if it used a QIconEngine.
286 * Projects which explicitly set an empty TARGET are considered broken now.
287 * The makespec and .qmake.cache do not see build pass specific variables any more.
288 * load()/include() with a target namespace and infile()/$$fromfile() now start with
289 an entirely pristine context.
290 * Configure's -sysroot and -hostprefix are now handled slightly differently.
291 The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
292 the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
293 The new QT_HOST_... properties can be used to refer to the Qt host tools.
294 * Several functions and built-in variables were modified to return normalized paths.
295 * The -(no-)exception flags in configure have been removed. Qt modules are now compiled
296 without exceptions by default, as they do not use them and can neither handle them
297 properly. Qt Core still has exceptions enabled to correctly throw bad_alloc exceptions
299 Whether code should be compiled with exception support enabled or disabled can be
300 controlled by a CONFIG += exceptions/exceptions_off setting in the .pro file.
302 - QTextCodecPlugin has been removed since it is no longer used. All text codecs
303 are now built into QtCore.
305 - QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
306 to use or check both.
308 - QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
309 QAbstractFileEngineHandler were removed from public API and are no longer
310 exported. They may temporarily live as private implementation details, but
311 they may be altogether dropped or otherwise changed at will in the future.
314 * toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
315 longer take a parameter for base, they will only perform localised base 10
316 conversions. For converting other bases use the QString methods instead.
318 - QSystemLocale has been removed from the public API.
320 - QSqlQueryModel::indexInQuery() is now virtual. See note below under QtSql.
322 - QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
323 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
324 are now virtual. See note below under QtSql.
326 - qMacVersion() has been removed. Use QSysInfo::macVersion() or
327 QSysInfo::MacintoshVersion instead.
329 - QColorDialog::customColor() now returns a QColor value instead of QRgb.
330 QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
331 take a QColor value for their second parameter instead of QRgb.
333 - QPageSetupDialog has had the PageSetupDialogOption enum and the api to
334 set and get the enum removed as none of the Options are used any more.
336 - QAbstractPageSetupDialog has been removed.
338 - QThread::terminated() has been removed, since its emission cannot be guaranteed.
340 - QPrintEngine - Removed the PPK_SuppressSystemPrintStatus key as no longer used.
342 - QCoreApplication::Type and QApplication::type() have been removed. These
343 Qt3 legacy application types did not match the application types
344 available in Qt5. Use for example qobject_cast instead to dynamically
345 find out the exact application type.
347 - The following QStyle implementations have been made internal:
352 * QWindowsMobileStyle
356 Instead of creating instances or inheriting these classes directly, use:
357 * QStyleFactory for creating instances of specific styles
358 * QProxyStyle for customizing existing style implementations
359 * QCommonStyle as a base for implementing full custom styles.
361 ****************************************************************************
363 ****************************************************************************
368 - The directory structure of the qtbase unit-tests has been reworked to
369 more closely match the directory structure of the code under test.
370 Integration tests have been moved to tests/auto/integrationtests.
372 - Qt is compiled with C++11 support enabled by default, provided the compiler
373 supports C++11. Qmake based projects can enable C++11 support explicitly
374 using 'CONFIG+=c++11' in their .pro files. To enable it conditionally, use
375 'contains(QT_CONFIG,c++11):CONFIG+=c++11'. This will enable C++11 support
376 only if Qt was built with C++11 support.
378 - The Unicode Data and Algorithms has been updated to match the
379 Unicode Standard of version 6.2. For more information see http://www.unicode.org/
381 - The QLocale data has been updated to CLDR 22.1.
382 For more information see http://cldr.unicode.org/
384 Third party components
385 ----------------------
387 - SQLITE_ENABLE_FTS3,SQLITE_ENABLE_FTS3_PARENTHESIS and SQLITE_ENABLE_RTREE
388 flags are now enabled by default on all platforms, for the sqlite3 copy under
389 the 3rdparty directory.
394 - Copyright of Qt has been transferred to Digia Plc.
396 ****************************************************************************
398 ****************************************************************************
402 * [QTBUG-12144], [QTBUG-18360] The QChar methods are now able to handle the full range
403 of Unicode codepoints defined by the Unicode Standard of version 6.2.
404 QChar::isPrint() will no longer return a false positives for
405 the Unicode format characters, surrogates, and private use characters.
407 * Drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
408 value is returned for an unassigned codepoints now.
410 * layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
411 layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
412 should now also connect to (and disconnect from) the rowsAboutToBeMoved and
415 * The QAbstractItemModel::sibling method was made virtual, allowing implementations
416 to optimize based on internal data.
418 * The default value of the property QSortFilterProxyModel::dynamicSortFilter was
419 changed from false to true.
421 * The signature of the virtual QAbstractItemView::dataChanged method has changed to
422 include the roles which have changed. The signature is consistent with the dataChanged
425 * QFileSystemWatcher is now able to return failure in case of errors whilst
426 altering the watchlist in both the singular and QStringList overloads of
427 addPath and removePath.
429 * QString::mid, QString::midRef and QByteArray::mid, if the position passed
430 is equal to the length (that is, right after the last character/byte),
431 now return an empty QString, QStringRef or QByteArray respectively.
432 in Qt 4 they returned a null QString or a null QStringRef.
434 * QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
435 toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
436 default or system locale, they will always use the C locale. This is to
437 guarantee consistent default conversion of strings. For locale-aware conversions
438 use the equivalent QLocale methods.
440 * QDate, QTime, and QDateTime have undergone important behavioural changes:
441 * QDate only implements the Gregorian calendar, the switch to the Julian
442 calendar before 1582 has been removed. This means all QDate methods will
443 return different results for dates prior to 15 October 1582, and there is
444 no longer a gap between 4 October 1582 and 15 October 1582.
445 * QDate::setYMD() is deprecated, use QDate::setDate() instead
446 * Most methods now apply strict validity checks and will return appropriate
447 and consistent values when invalid. For example, QDate::year() will return
448 0 and QDate::shortMonthName() will return QString().
449 * Adding days to a null QDate or seconds to a null QTime will no longer return
451 * QDate stores the Julian Day as a qint64 extending date support across a
452 more interesting range, see the class documentation for details.
453 * Conversion to YMD form dates is only accurate between to 4800 BCE to
455 * The QDate::addDays() and QDateTime::addDays() methods now take a qint64
456 * The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64
458 * QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
459 been removed. This was removed due to issues with breaking other code from
460 libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
461 extent) performance issues.
463 * QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed.
464 QObject::trUtf8 and QCoreApplication::Encoding enum are now obsolete. Qt assumes
465 that the source code is encoded in UTF-8.
467 * QFile::setEncodingFunction and QFile::setDecodingFunction are obsolete and do
468 nothing in Qt 5. The QFile::encodeName and QFile::decodeName functions are now
469 hardcoded to operate on QString::fromLocal8Bit and QString::toLocal8Bit
470 only. Therefore, it's still possible to obtain the old behaviour by calling
471 QTextCodec::setCodecForLocale. However, that is not recommended: new code
472 should not make assumptions about the filesystem encoding and older code should
473 have those assumptions removed.
475 * QIntValidator and QDoubleValidator no longer fall back to using the C locale if
476 the requested locale fails to validate the input.
478 * A new set of classes for doing pattern matching with Perl-compatible regular
479 expressions has been added: QRegularExpression, QRegularExpressionMatch and
480 QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
481 powerful and flexible regular expression engine.
483 * QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
484 * The enum values simply didn't make sense in the first place and should simply be dropped.
486 * Filtering of native events (QCoreApplication::setEventFilter, as well as
487 QApplication::x11EventFilter/macEventFilter/qwsEventFilter/winEventFilter) have been replaced
488 with QCoreApplication::installNativeEventFilter and removeNativeEventFilter,
489 for an API much closer to QEvent filtering. Note that the native events that can be
490 filtered this way depend on which QPA backend is chosen, at runtime. On X11, XEvents are
491 not used anymore, and have been replaced with xcb_generic_event_t due to the switch to
492 XCB, which requires porting the application code to XCB as well.
494 * [QTBUG-23529] QHash is now more resilient to a family of denial of service
495 attacks exploiting algorithmic complexity, by supporting two-arguments overloads
496 of the qHash() hashing function.
498 * [QTBUG-4844] QObject::disconnectNotify() is now called when a receiver is destroyed.
501 - [QTBUG-15430] Added a QStateMachine constructor that takes a ChildMode parameter.
502 - [QTBUG-17975] Delayed event posting now works from secondary threads.
503 - [QTBUG-19789] Signal transitions now work correctly when the sender is in a different thread.
504 - [QTBUG-20362] Property assignments now work as expected with nested, parallel states.
505 - [QTBUG-22931] The root state can now be a parallel state group.
506 - [QTBUG-24307] The initial state is now entered before the started() signal is emitted.
507 - [QTBUG-25959] State entry and exit order is now SCXML spec-compliant.
509 * qDebug(), qWarning(), qCritical(), and qFatal() were changed to macros that track the origin
510 of the message in source code. Whether this and other meta-information is printed can be
511 configured (for the default message handler) by setting the new QT_MESSAGE_PATTERN environment
512 variable. qInstallMsgHandler() has been deprecated, and should be replaced with
513 qInstallMessageHandler().
515 * QTextBoundaryFinder
516 - [QTBUG-6498] The word start and word end boundaries detection is now
517 unaware of surrounding white space characters.
518 - SoftHyphen enum value has been added to specify a line break opportunity
519 at a soft hyphen (SHY) character.
520 - MandatoryBreak enum value has been added to specify a mandatory (aka "hard") line breaks.
521 - Source-incompatible change: Since the behavior of boundaryReasons() method
522 has been changed a lot, StartWord/EndWord enum values were intentionally replaced
523 with StartOfItem/EndOfItem ones to force the affected code be revised.
525 * Softkeys API was removed. The following functions and enums were removed:
526 - QAction::setSoftKeyRole()
527 - QAction::softKeyRole()
528 - QAction::SoftKeyRole
529 - Qt::WA_MergeSoftkeys
530 - Qt::WA_MergeSoftkeysRecursively
531 - Qt::WindowSoftkeysVisibleHint
532 - Qt::WindowSoftkeysRespondHint
535 - [QTBUG-27987] Constructing a QLocale object with the short locale id has been improved.
538 - Added overloads of connect() to connect using pointers to member function
539 - Added QObject::isSignalConnected()
543 * Accessibility has been refactored. The hierachy of accessible objects is implemented via
544 proper parent/child functions instead of using navigate which has been deprecated for this purpose.
545 Table and cell interfaces have been added to qaccessible2.h
547 * Touch events and points have been extended to hold additional
548 information like capability flags, point-specific flags, velocity,
551 * A new set of enabler classes have been added, most importantly QWindow, QScreen,
552 QSurfaceFormat, and QOpenGLContext.
554 * Most of the useful QtOpenGL classes have been polished and moved into
555 QtGui. See QOpenGLFramebufferObject, QOpenGLShaderProgram,
556 QOpenGLFunctions, etc.
558 * QOpenGLPaintDevice has been added to be able to use QPainter to render into
559 the currently bound context.
561 * Behavioral change in QImage::fill() on an image with format Format_RGB888:
562 For consistency with RGB32 and other 32-bit formats, function now expects
563 image data in RGB layout as opposed to BGR layout.
565 * Behavioral change in QImage and QPixmap load()/loadFromData() on a non-null image:
566 If load() or loadFromData() fails to load the image (returns false) then
567 the existent image data will be invalidated, so that isNull() is guaranteed
568 to return true in this case.
570 * Behavioral change regarding QPainter fill rules when not using antialiased
571 painting: The fill rules have changed so that the aliased and antialiased
572 coordinate systems match. Earlier there used to be an offset of slightly less
573 than half a pixel when doing sub-pixel rendering, in order to be consistent
574 with the old X11 paint engine. The new behavior should be more predictable and
575 gives the same consistent rounding for images / pixmaps as for paths and
576 rectangle filling. It's possible to still get the old behavior by setting the
577 QPainter::Qt4CompatiblePainting render hint.
579 * Behavioral change regarding QPen: The default QPen constructors now create a
580 1-width non-cosmetic pen as opposed to a 0-width cosmetic pen. The old
581 behavior can be emulated by setting the QPainter::Qt4CompatiblePainting
582 render hint when painting.
586 * A new style QFusionStyle has been introduced, while QPlastiqueStyle, QCleanlooksStyle,
587 QCDEStyle and QMotifStyle have been removed. The older styles will be
588 made available to applications as a standalone source package.
590 * QInputContext removed as well as related getters and setters on QWidget and QApplication.
591 Input contexts are now platform specific.
593 * QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.
595 * In Qt 4, QStyle::standardIconImplementation() and layoutSpacingImplementation()
596 were introduced instead of making the corresponding methods virtual due to binary
597 compatibility reasons. QStyle::standardIcon() and layoutSpacing() have been made
598 (pure) virtual in Qt 5.
600 * In Qt 4, many QStyleOption subclasses were introduced in order to keep
601 binary compatibility -- QStyleOption was designed to be extended this way,
602 in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
603 classes have been removed, and their members merged into the respective
604 base classes. Those classes were left as typedefs to keep existing code
605 working. Still, some minor adjustements could be necessary, especially in code
606 that uses QStyleOption directly and does not initialize all the members using
607 the proper Qt API: due to the version bump, QStyle will try to use the additional
608 QStyleOption members, which are left default-initialized.
610 * QHeaderView has been refactored and the following functions have been obsoleted:
612 * void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.
614 * bool isMovable() const - use bool sectionsMovable() const instead.
616 * void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.
618 * bool isClickable() const - use bool sectionsClickable() instead.
620 * void setResizeMode(int logicalindex, ResizeMode mode) -
621 use setSectionResizeMode(logicalindex, mode) instead.
623 * ResizeMode resizeMode(int logicalindex) const -
624 use sectionResizeMode(int logicalindex) instead.
626 * setSortIndicator will no longer emit sortIndicatorChanged when the sort indicator is unchanged.
628 * QDateEdit and QTimeEdit have re-gained a USER property. These were originally removed
629 before Qt 4.7.0, and are re-added for 5.0. This means that the userProperty for
630 those classes are now QDate and QTime respectively, not QDateTime as they have been
631 for the 4.7 and 4.8 releases.
633 * QGraphicsItem and derived classes - Passing a QGraphicsScene in the items constructor
634 is no longer supported. Construct the item without a scene and then call
635 QGraphicsScene::addItem() to add the item to the scene.
637 * QAbstractItemView and derived classes only emit the clicked() signal on left click now,
638 instead of on all mouse clicks.
640 * QProxyModel has been removed. It is deprecated since early Qt 4 versions and replaced
641 by QAbstractProxyModel and related classes. A copy of QProxyModel is available
642 in the UiHelpers library.
644 * The virtual methods QApplication::commitData and QApplication::saveState, used for session
645 management, no longer exist.
646 Connect to the commitDataRequest and saveStateRequest signals instead.
647 The new isSessionSaving() method can be used in the cases where the closeEvent of your
648 window needs to know whether it is being called during shutdown.
650 * [QTBUG-20503] QFileSystemModel no longer masks out write permissions from the permissions
651 returned from permissions() or data(FilePermissions), even if in read-only mode
652 (QFileSystemModel::isReadOnly()).
654 * [QTBUG-158 QTBUG-428 QTBUG-26501] QComboBox::currentText improvements
655 Restored currentText as USER property.
656 New setter setCurrentText(), marked as WRITE method, usable by QItemDelegate and QDataWidgetMapper.
657 New signal currentTextChanged() marked as NOTIFY method.
661 * QHostAddress::isLoopback() API added. Returns true if the address is
662 one of the IP loopback addresses.
664 * QSslCertificate::serialNumber() now always returns the serial number in
667 * The openssl network backend now reads the ssl configuration file allowing
668 the use of openssl engines.
672 * QtDBus now generates property annotations for the Qt type names
673 in the org.qtproject.QtDBus namespace. When parsing such annotations
674 both the old and new namespaces are accepted.
676 * QtDBus error codes have been updated to be on the org.qtproject.QtDBus.Error
682 * QtConcurrent is no longer in QtCore, but forms its own library now.
683 QMake-based projects can use
685 to include the new library.
687 * QtConcurrent::Exception has been renamed to QException, and is still in QtCore.
688 Ditto QtConcurrent::UnhandledException.
693 * Most of the classes in this module (with the notable exception of QGLWidget)
694 now have equivalents in QtGui, along with the naming change QGL -> QOpenGL.
695 The classes in QtOpenGL that have equivalents in QtGui can now be considered
697 * QGLPixelBuffer is now deprecated and implemented in terms of a hidden
698 QGLWidget and a QOpenGLFramebufferObject. It is recommended that applications
699 using QGLPixelBuffer for offscreen rendering to a texture switch to using
700 QOpenGLFramebufferObject directly instead, for improved performance.
701 * The default major version of QGLFormat has been changed to 2 to be aligned
702 with QSurfaceFormat. Applications that want to use a different version should
703 explicitly request it using QGLFormat::setVersion().
704 * void QGLContext::generateFontDisplayLists(const QFont& font, int listBase)
705 and int QGLWidget::fontDisplayListBase(const QFont & fnt, int listBase)
706 which were deprecated in Qt 4 have been removed.
707 * Previously deprecated default value listBase parameter has been removed from
708 both QGLWidget::renderText() functions.
709 * In order to ensure support on more platforms, stricter requirements have been
710 introduced for doing threaded OpenGL. First, you must call makeCurrent() at
711 least once per swapBuffers() call, so that the platform has a chance to
712 synchronize resizes to the OpenGL surface. Second, before doing makeCurrent()
713 or swapBuffers() in a separate thread, you must call
714 QGLContext::moveToThread(QThread *) to explicitly let Qt know in which thread
715 a QGLContext is currently being used. You also need to make sure that the
716 context is not current in the current thread before moving it to a different
721 * [QTBUG-2124] Added default conversion for long and unsigned long.
722 * [QTBUG-6133] Fixed QScriptContextInfo::functionMetaIndex() for overloaded
724 * [QTBUG-15213] Doc: Added missing properties to the ECMAScript reference.
725 * [QTBUG-15956] Doc: Removed wrong information about Error .stack properties.
726 * [QTBUG-17915] Fixed a crash when a JS property descriptor was only partially
728 * [QTBUG-18188] Fixed a regression that caused contexts created by
729 QScriptEngine::pushContext() to inherit the parent context's scope.
730 * [QTBUG-18201] Suppressed 'LEAK' messages on stderr at application exit.
731 * [QTBUG-20378] Fixed QtScriptTools compilation when some features are disabled.
732 * [QTBUG-20845] Fixed a precision bug in the calculator example.
733 * [QTBUG-21548] Fixed a crash in QScriptEngineDebugger when the QScriptEngine
734 being debugged was deleted.
735 * [QTBUG-21760] Fixed a crash when accessing QObject properties through an
737 * [QTBUG-21896] Fixed a crash when converting an invalid JS value to a string.
738 * [QTBUG-21993] Fixed a bug that caused QObject wrapper objects created with
739 the PreferExistingWrapperObject option to not be garbage collected, even if
740 the object was not referenced anywhere in the scripting environment.
741 * [QTBUG-22152] Fixed build issue on Solaris.
742 * [QTBUG-23871] Fixed a JIT crash on x86-64 caused by out-of-range branch
744 * [QTBUG-26261] Fixed a crash when a queued signal handler no longer existed.
745 * [QTBUG-26590] Fixed a bug that caused QObjects with script connections to
746 not be garbage collected as expected.
750 * [QTBUG-20615] Autotests can now log test output to multiple destinations
751 and log formats simultaneously.
752 * [QTBUG-21645] QSignalSpy now handles QVariant signal parameters more
753 intuitively; the QVariant value is copied directly, instead of being
754 wrapped inside a new QVariant. This means that calling
755 qvariant_cast<QVariant>() on the QSignalSpy item (to "unwrap" the value)
756 is no longer required (but still works).
760 QSqlQueryModel/QSqlTableModel/QSqlRelationalTableModel
762 * The dataChanged() signal is now emitted for changes made to an inserted
763 record that has not yet been committed. Previously, dataChanged() was
764 suppressed in this case for OnRowChange and OnFieldChange. This was probably
765 an attempt to avoid trouble if setData() was called while handling
766 primeInsert(). By emitting dataChanged(), we ensure that all views are aware
769 * While handling primeInsert() signal, the record must be manipulated using
770 the provided reference. Do not attempt to manipulate the records using the
771 model methods setData() or setRecord().
773 * removeRows() no longer emits extra beforeDelete signal for out of range row.
775 * removeRows() now requires the whole range of targetted rows to be valid
776 before doing anything. Previously, it would remove what it could and
777 ignore the rest of the range.
779 * removeRows(), for OnFieldChange and OnRowChange, allows only 1 row to be
780 removed and only if there are no other changed rows.
782 * setRecord() and insertRecord()
783 -The generated flags from the source record are preserved in the model
784 and determine which fields are included when changes are applied to
786 -Require all fields to map correctly. Previously fields that didn't
787 map were simply ignored.
788 -For OnManualSubmit, insertRecord() no longer leaves behind an empty
789 row if setRecord() fails.
790 -setRecord() now automatically submits for OnRowChange.
792 * QSqlQueryModel::indexInQuery() is now virtual. See
793 QSqlTableModel::indexInQuery() as example of how to implement in a
796 * QSqlQueryMode::setQuery() emits fewer signals. The modelAboutToBeReset()
797 and modelReset() signals suffice to inform views that they must reinterrogate
800 * QSqlTableModel::select() is now a slot.
802 * QSqlTableModel::selectRow(): This is a new slot that refreshes a single
803 row in the model from the database.
805 * QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
806 Previously, after changes were submitted in these edit strategies, select()
807 was called which removed and inserted all rows. This ruined navigation
808 in QTableView. Now, with these edit strategies, there is no implicit select()
809 done after committing. This includes deleted rows which remain in
810 the model as blank rows until the application calls select(). Instead,
811 selectRow() is called to refresh only the affected row.
813 * QSqlTableModel::isDirty(): New overloaded method to check whether model
814 has any changes to submit. QTBUG-3108
816 * QSqlTableModel::setData() and setRecord() no longer revert pending changes
817 that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
818 Instead, pending (failed) changes cause new changes inappropriate to the
819 edit strategy to be refused. The application should resolve or revert pending
820 changes. insertRows() and insertRecord() also respect the edit strategy.
822 * QSqlTableModel::setData() and setRecord() in OnRowChange no longer have the
823 side effect of submitting the cached row when invoked on a different row.
825 * QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
826 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
827 are now virtual. Their xxxImplemenation counterparts have been removed
828 now that QSqlDriver subclasses can reimplement these directly.
830 ****************************************************************************
832 ****************************************************************************
836 * QVariant::Bool type now mapped to integers 0/1 in SQL instead of strings
837 'true' and 'false'. Sqlite does not have a boolean column type and it is
838 customary to use integer. QTBUG-23895
842 * the error message returned in QSqlError::text() has the SQLSTATE error code
843 appended in parantheses.
845 ****************************************************************************
846 * Platform Specific Changes *
847 ****************************************************************************
855 * Accessibility framework uses IAccessible2
856 * ANGLE can be used to provide Open GL ES 2.0 (see http://code.google.com/p/angleproject/)
862 Qt for Embedded Linux
863 ---------------------
870 ****************************************************************************
871 * Compiler Specific Changes *
872 ****************************************************************************
875 ****************************************************************************
877 ****************************************************************************
881 * Remove qttest_p4.prf file. From now on we should explicitly enable the
882 things from it which we want. Autotest .pro files should stop using
883 'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.
888 * [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
889 translation attributes which apply to all items.
890 They are by default translatable.
899 * [QTBUG-20785] The moc now has a -b<file> option to #include an additional
900 file at the beginning of the generated file.
901 * moc is now able to fully understand and expands preprocessor macros.
911 * QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
917 * The Mac OS X -dwarf2 configure argument has been removed. DWARF2 is always
918 used on Mac OS X now.
923 ****************************************************************************
925 ****************************************************************************
926 - The text codecs that were previously plugins are now built into QtCore.
927 - Code using Q_EXPORT_PLUGIN macros will no longer compile. Use
928 Q_PLUGIN_METADATA instead. Note that this requires that the class
929 be default-constructible.
931 ****************************************************************************
932 * Important Behavior Changes *
933 ****************************************************************************
937 * The implementation of QPointer has been changed to use QWeakPointer. The
938 old guard mechanism has been removed. This causes a slight change
939 in behavior when using QPointer:
941 * When using QPointer on a QWidget (or a subclass of QWidget), previously
942 the QPointer would be cleared by the QWidget destructor. Now, the QPointer
943 is cleared by the QObject destructor (since this is when QWeakPointers are
944 cleared). Any QPointers tracking a widget will NOT be cleared before the
945 QWidget destructor destroys the children for the widget being tracked.
949 * QUrl has been changed to operate only on percent-encoded
950 forms. Fully-decoded forms, where the percent character stands for itself,
951 are no longer possible. For that reason, the getters and setters with
952 "encoded" in the name are deprecated, except for QUrl::toEncoded() and
955 QUrl now operates in a mode where it decodes as much as it can of the
956 percent-encoding sequences. In addition, the setter methods possess a mode
957 in which a '%' character not part of a percent-encoding sequence will cause
958 the parser to correct the input. Therefore, most software will not require
959 changes to adapt, since the getter methods will continue returning the
960 components in their most-decoded form as they did before and the setter
961 methods will accept input as they did before..
963 The most notable difference is when dealing with
964 QUrl::toString(). Previously, this function would return percent characters
965 in the URL by themselves. Now, it will return "%25", like
970 * Definition of QVariant::UserType changed. Currently it is the same as
971 QMetaType::User, which means that it points to the first registered custom
972 type, instead of a nonexistent type.
976 * Interpretation of QMetaType::Void was changed. Before, in some cases
977 it was returned as an invalid type id, but sometimes it was used as a valid
978 type (C++ "void"). In Qt5, new QMetaType::UnknownType was introduced to
979 distinguish between these two. QMetaType::UnknownType is an invalid type id
980 signaling that a type is unknown to QMetaType, and QMetaType::Void
981 is a valid type id of C++ void type. The difference will be visible for
982 example in call to QMetaType::typeName(), this function will return null for
983 QMetaType::UnknownType and a pointer to "void" string for
985 Please, notice that QMetaType::UnknownType has value 0, which previously was
986 reserved for QMetaType::Void.
991 * The static function QMessageBox::question has changed the default argument
992 for buttons. Before the default was to have an Ok button. That is changed
993 to having a yes and a no button.