1 Some of the changes listed in this file include issue tracking numbers
2 corresponding to tasks in the Qt Bug Tracker:
4 http://bugreports.qt-project.org/
6 Each of these identifiers can be entered in the bug tracker to obtain more
7 information about a particular change.
10 ****************************************************************************
11 * Source incompatible changes *
12 ****************************************************************************
16 * The signatures of the connectNotify() and disconnectNotify() functions
17 have changed. The functions now get passed a QMetaMethod that identifies
18 the signal, rather than a const char *.
20 - QSslCertificate::subjectInfo() and QSslCertificate::issuerInfo() now
21 return a QStringList instead of a QString
23 - QSslCertificate::isValid() has been deprecated. Originally it only checked
24 the certificate dates, but later checking for blacklisting was added. Now
25 there's a more specific QSslCertificate::isBlacklisted() method.
27 - Unite clipping support has been removed from QPainter. The alternative is
28 to unite QRegion's and using the result on QPainter.
30 - QLibrary::resolve() now returns a function pointer instead of a void
33 - QSslCertificate::alternateSubjectNames() is deprecated (but can be enabled
34 via QT_DISABLE_DEPRECATED_BEFORE), use
35 QSslCertificate::subjectAlternativeNames() instead.
37 - QLibraryInfo::buildKey() has been removed. Likewise, the QT_BUILD_KEY
38 preprocessor #define has also been removed. The build-key is obsolete
39 and is no longer necessary.
41 - QCoreApplication::translate() will no longer return the source text when
42 the translation is empty. Use lrelease -removeidentical for optimization.
44 - QTranslator subclasses need to adjust the signature of the virtual method
45 translate() in order to add the "int n = -1" argument.
47 - QString and QByteArray constructors that take a size argument will now treat
48 negative sizes to indicate nul-terminated strings (a nul-terminated array of
49 QChar, in the case of QString). In Qt 4, negative sizes were ignored and
50 result in empty QString and QByteArray, respectively. The size argument to
51 those constructors now has a default value of -1, thus replacing the separate
52 constructors that did the same.
54 - Qt::escape() is deprecated (but can be enabled via
55 QT_DISABLE_DEPRECATED_BEFORE), use QString::toHtmlEscaped() instead.
57 - QBool is gone. QString::contains, QByteArray::contains, and QList::contains
58 used to return an internal QBool class so that the Qt3 code
59 "if (a.contains() == 2)" wouldn't compile anymore. Such code cannot exist
60 in Qt4, so these methods return a bool now. If your code used the undocumented
61 QBool, simply replace it with bool.
63 - qIsDetached<> has been removed without replacement.
65 - The return type of QFlags<Enum>::operator int() now matches the Enum's underlying
66 type in signedness instead of always being 'int'. This was done in order to allow
67 QFlags over enums whose underlying type is unsigned (Qt::MouseButton is one such
71 * QMetaType::construct() has been renamed to QMetaType::create().
72 * QMetaType::unregisterType() has been removed.
73 * QMetaType now records if the type argument inherits QObject. This
74 can be used in scripting APIs, so that custom QObject subclasses
75 are treated as QObject pointers. In QtScript for example, this can
76 mean that QScriptValue.isQObject can be true where it was false before.
77 * QMetaType::QWidgetStar has been removed. Use qMetaTypeId<QWidget*>()
78 or QVariant::canConvert<QWidget*>() as appropriate.
81 * QMetaMethod::signature() has been renamed to QMetaMethod::methodSignature(),
82 and the return type has been changed to QByteArray. This was done to be able
83 to generate the signature string on demand, rather than always storing it in
85 * QMetaMethod::typeName() no longer returns an empty string when the return
86 type is void; it returns "void". The recommended way of checking whether a
87 method returns void is to compare the return value of QMetaMethod::returnType()
91 * Inconsistent constructor taking Qt::GlobalColor and producing QVariant(QColor)
92 instance was removed. Code constructing such variants can be migrated by
93 explicitly calling QColor constructor. For example from "QVariant(Qt::red)"
94 to "QVariant(QColor(Qt::red))"
97 * The plain-text, xml and lightxml test output formats have been changed to
98 show a test result for every row of test data in data-driven tests. In
99 Qt4, only fails and skips were shown for individual data rows and passes
100 were not shown for individual data rows, preventing accurate calculation
101 of test run rates and pass rates.
102 * The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
103 These macros formerly lived in tests/shared/util.h but are now provided
104 by including the <QtTest/QtTest> header. In addition,
105 QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
106 allowing for specifying custom timeout values.
107 * The QTEST_NOOP_MAIN macro has been removed from the API. If a test is
108 known at compile-time to be inapplicable for a particular build it should
109 be omitted via .pro file logic, or the test should call QSKIP in the
110 initTestCase() method to skip the entire test and report a meaningful
111 explanation in the test log.
112 * The DEPENDS_ON macro has been removed from the API. This macro did nothing
113 and misled some users to believe that they could make test functions depend
114 on each other or impose an execution order on test functions.
115 * The QTest::qt_snprintf function has been removed from the API. This was an
116 internal testlib function that was exposed in the public API due to its use
117 in a public macro. Any calls to this function should be replaced by a call
118 to qsnprintf(), which comes from the <QtCore/QByteArray> header.
119 * The QTest::pixmapsAreEqual() function has been removed from the API.
120 Comparison of QPixmap objects should be done using QCOMPARE, which provides
121 more informative output in the event of a failure.
122 * The QSKIP macro no longer has the "mode" parameter, which caused problems
123 for calculating test metrics, as the SkipAll mode hid information about
124 what test data was skipped. Calling QSKIP in a test function now behaves
125 like SkipSingle -- skipping a non-data-driven test function or skipping
126 only the current data row of a data-driven test function. Every skipped
127 data row is now reported in the test log.
128 * The qCompare() function template was both overloaded and specialised, which
129 made it almost impossible to specialise the correct primary template and
130 could lead to indecipherable error messages or surprising overload resolution
131 (such as going via qCompare(QFlags<void*>,int) to satisfy a request for
132 qCompare<void*>()). Now, specialisation has been replaced by overloading.
133 As a consquence, code such as qCompare<QString>(l, r) will no longer use the
134 QString-specific implementation and may fail to compile. We recommend you
135 replace specialisations with overloading, too. Also, don't pass explicit
136 template arguments to qCompare (e.g. qCompare<QString>(l, r)), but let
137 overload resolution pick the correct one, and cast arguments in case of
138 ambiguous overloads (e.g. qCompare(QString(l), r)). The resulting code will
139 continue to work against older QtTestlib versions.
141 - The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .
144 * Internal QAccessible::State enum value HasInvokeExtension removed
145 - QAccessibleInterface:
146 * The "child" integer parameters have been removed. This moves the api
147 to be closer to IAccessible2.
148 This means several functions lose their integer parameter:
149 text(Text t, int child) -> text(Text t), rect(int child) -> rect()
150 setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
151 role(int child) -> role(), state(int child) -> state()
152 * parent() and child() was added in order to do hierarchical navigation.
153 * relations() was added as a replacement to relationTo()
154 * As a consequence of the above two points, navigate() was removed.
155 * Accessible-Action related functions have been removed. QAccessibleInterface
156 subclasses are expected to implement the QAccessibleActionInterface instead.
157 These functions have been removed:
158 QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
159 QAccessibleInterface::doAction
160 - QAccessibleEvent also loses the child parameter.
161 QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
162 QAccessibleEvent::child() removed.
163 - QAccessibleActionInterface:
164 * Refactored to be based on action names. All functions have been changed from using
165 int parameters to strings.
167 - QSound has been moved from QtGui to QtMultimedia
169 - QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
170 as all coordinates are floating point based now.
174 * The DeviceType enum and deviceType() have been deprecated due to
175 the introduction of QTouchDevice.
177 * The signature of the constructor has changed. It now takes a
178 QTouchDevice pointer instead of just a DeviceType value.
180 * TouchPointState no longer includes TouchPointStateMask and
181 TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
184 * QWidget *widget() has been removed and is replaced by QObject
185 *target() in order to avoid QWidget dependencies.
187 * QEvent::TouchCancel has been introduced. On systems where it makes
188 sense this event type can be used to differentiate between a
189 regular TouchEnd and abrupt touch sequence cancellations caused by
190 the compositor, for example when a system gesture gets recognized.
194 * Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
195 cases where a forward declared type should be used as a metatype,
196 Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
197 * Similarly, Q_DECLARE_METATYPE(QSharedPointer<Foo>), and
198 Q_DECLARE_METATYPE(QWeakPointer<Foo>) require Foo to be fully defined. Again
199 though, Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
203 * The signature of the createEditor and valuePropertyName methods
204 have been changed to take arguments of type int instead of QVariant::Type.
206 - QModelIndex/QAbstractItemModel
208 * The integer value that can be stored in a QModelIndex is now of type
209 quintptr to match the size of the internal storage location.
210 * The createIndex() method now only provides the void* and quintptr
211 overloads, making calls with a literal 0 (createIndex(row, col, 0))
212 ambiguous. Either cast (quintptr(0)) or omit the third argument
213 (to get the void* overload).
215 - QWindowSystemInterface:
217 * The signature of all handleTouchEvent() variants have changed,
218 taking a QTouchDevice* instead of just a DeviceType value.
219 Platform or generic plug-ins have to create and register at least
220 one QTouchDevice before sending the first touch event.
222 * The event type parameter is removed from handleTouchEvent().
224 - The previously exported function qt_translateRawTouchEvent() has been removed.
225 Use QWindowSystemInterface::handleTouchEvent() instead.
227 - QAbstractEventDispatcher
229 * The signature for the pure-virtual registerTimer() has changed. Subclasses
230 of QAbstractEventDispatcher will need to be updated to reimplement the new
231 pure-virtual 'virtual void registerTimer(int timerId, int interval,
232 Qt::TimerType timerType, QObject *object) = 0;'
234 * QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
235 now a struct with 3 members: struct TimerInfo { int timerId; int interval;
236 Qt::TimerType timerType; }; Reimplementations of
237 QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
238 3 arguments to the TimerInfo constructor (instead of 2).
242 * Removed implicit conversion operator QUuid::operator QString(), instead
243 QUuid::toString() function should be used.
245 - The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
246 been removed, QNetworkAccessManager should be used instead.
248 - The QFtp and QUrlInfo classes are no longer exported, QNetworkAccessManager should be used
249 instead. These classes are available in a separate module, qtftp.
253 * On Windows, QProcess::ForwardedChannels will not forward the output of GUI
254 applications anymore, if they do not create a console.
256 - QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
257 connectToHostImplementation() and disconnectFromHostImplementation() don't exist.
259 - QTcpServer::incomingConnection() now takes a qintptr instead of an int.
261 - QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.
263 - QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
264 QDir::toNativeSeparators() instead.
266 - QIconEngineV2 was merged into QIconEngine
267 You might need to adjust your code if it used a QIconEngine.
270 * Projects which explicitly set an empty TARGET are considered broken now.
271 * The makespec and .qmake.cache do not see build pass specific variables any more.
272 * load()/include() with a target namespace and infile()/$$fromfile() now start with
273 an entirely pristine context.
274 * Configure's -sysroot and -hostprefix are now handled slightly differently.
275 The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
276 the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
277 The new QT_HOST_... properties can be used to refer to the Qt host tools.
278 * Several functions and built-in variables were modified to return normalized paths.
279 * The -(no-)exception flags in configure have been removed. Qt modules are now compiled
280 without exceptions by default, as they do not use them and can neither handle them
281 properly. Qt Core still has exceptions enabled to correctly throw bad_alloc exceptions
283 Whether code should be compiled with exception support enabled or disabled can be
284 controlled by a CONFIG += exceptions/exceptions_off setting in the .pro file.
286 - QTextCodecPlugin has been removed since it is no longer used. All text codecs
287 are now built into QtCore.
289 - QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
290 to use or check both.
292 - QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
293 QAbstractFileEngineHandler were removed from public API and are no longer
294 exported. They may temporarily live as private implementation details, but
295 they may be altogether dropped or otherwise changed at will in the future.
298 * toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
299 longer take a parameter for base, they will only perform localised base 10
300 conversions. For converting other bases use the QString methods instead.
302 - QSystemLocale has been removed from the public API.
304 - QSqlQueryModel::indexInQuery() is now virtual. See note below under QtSql.
306 - QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
307 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
308 are now virtual. See note below under QtSql.
310 - qMacVersion() has been removed. Use QSysInfo::macVersion() or
311 QSysInfo::MacintoshVersion instead.
313 - QColorDialog::customColor() now returns a QColor value instead of QRgb.
314 QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
315 take a QColor value for their second parameter instead of QRgb.
317 - QPageSetupDialog has had the PageSetupDialogOption enum and the api to
318 set and get the enum removed as none of the Options are used any more.
320 - QAbstractPageSetupDialog has been removed.
322 ****************************************************************************
324 ****************************************************************************
329 - The directory structure of the qtbase unit-tests has been reworked to
330 more closely match the directory structure of the code under test.
331 Integration tests have been moved to tests/auto/integrationtests.
333 - Qt is compiled with C++11 support enabled by default, provided the compiler
334 supports C++11. Qmake based projects can enable C++11 support explicitly
335 using 'CONFIG+=c++11' in their .pro files. To enable it conditionally, use
336 'contains(QT_CONFIG,c++11):CONFIG+=c++11'. This will enable C++11 support
337 only if Qt was built with C++11 support.
339 - The Unicode Data and Algorithms has been updated to match the
340 Unicode Standard of version 6.2. For more information see http://www.unicode.org/
342 Third party components
343 ----------------------
345 - SQLITE_ENABLE_FTS3,SQLITE_ENABLE_FTS3_PARENTHESIS and SQLITE_ENABLE_RTREE
346 flags are now enabled by default on all platforms, for the sqlite3 copy under
347 the 3rdparty directory.
350 ****************************************************************************
352 ****************************************************************************
356 * [QTBUG-12144], [QTBUG-18360] The QChar methods are now able to handle the full range
357 of Unicode codepoints defined by the Unicode Standard of version 6.2.
358 QChar::isPrint() will no longer return a false positives for
359 the Unicode format characters, surrogates, and private use characters.
361 * Drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
362 value is returned for an unassigned codepoints now.
364 * layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
365 layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
366 should now also connect to (and disconnect from) the rowsAboutToBeMoved and
369 * The QAbstractItemModel::sibling method was made virtual, allowing implementations
370 to optimize based on internal data.
372 * The default value of the property QSortFilterProxyModel::dynamicSortFilter was
373 changed from false to true.
375 * The signature of the virtual QAbstractItemView::dataChanged method has changed to
376 include the roles which have changed. The signature is consistent with the dataChanged
379 * QFileSystemWatcher is now able to return failure in case of errors whilst
380 altering the watchlist in both the singular and QStringList overloads of
381 addPath and removePath.
383 * QString::mid, QString::midRef and QByteArray::mid, if the position passed
384 is equal to the length (that is, right after the last character/byte),
385 now return an empty QString, QStringRef or QByteArray respectively.
386 in Qt 4 they returned a null QString or a null QStringRef.
388 * QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
389 toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
390 default or system locale, they will always use the C locale. This is to
391 guarantee consistent default conversion of strings. For locale-aware conversions
392 use the equivalent QLocale methods.
394 * QDate, QTime, and QDateTime have undergone important behavioural changes:
395 * QDate only implements the Gregorian calendar, the switch to the Julian
396 calendar before 1582 has been removed. This means all QDate methods will
397 return different results for dates prior to 15 October 1582, and there is
398 no longer a gap between 4 October 1582 and 15 October 1582.
399 * QDate::setYMD() is deprecated, use QDate::setDate() instead
400 * Most methods now apply strict validity checks and will return appropriate
401 and consistent values when invalid. For example, QDate::year() will return
402 0 and QDate::shortMonthName() will return QString().
403 * Adding days to a null QDate or seconds to a null QTime will no longer return
405 * QDate stores the Julian Day as a qint64 extending date support across a
406 more interesting range, see the class documentation for details.
407 * Conversion to YMD form dates is only accurate between to 4800 BCE to
409 * The QDate::addDays() and QDateTime::addDays() methods now take a qint64
410 * The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64
412 * QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
413 been removed. This was removed due to issues with breaking other code from
414 libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
415 extent) performance issues.
417 * QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed.
418 QObject::trUtf8 and QCoreApplication::Encoding enum are now obsolete. Qt assumes
419 that the source code is encoded in UTF-8.
421 * QFile::setEncodingFunction and QFile::setDecodingFunction are obsolete and do
422 nothing in Qt 5. The QFile::encodeName and QFile::decodeName functions are now
423 hardcoded to operate on QString::fromLocal8Bit and QString::toLocal8Bit
424 only. Therefore, it's still possible to obtain the old behaviour by calling
425 QTextCodec::setCodecForLocale. However, that is not recommended: new code
426 should not make assumptions about the filesystem encoding and older code should
427 have those assumptions removed.
429 * QIntValidator and QDoubleValidator no longer fall back to using the C locale if
430 the requested locale fails to validate the input.
432 * A new set of classes for doing pattern matching with Perl-compatible regular
433 expressions has been added: QRegularExpression, QRegularExpressionMatch and
434 QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
435 powerful and flexible regular expression engine.
437 * QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
438 * The enum values simply didn't make sense in the first place and should simply be dropped.
440 * Filtering of native events (QCoreApplication::setEventFilter, as well as
441 QApplication::x11EventFilter/macEventFilter/qwsEventFilter/winEventFilter) have been replaced
442 with QCoreApplication::installNativeEventFilter and removeNativeEventFilter,
443 for an API much closer to QEvent filtering. Note that the native events that can be
444 filtered this way depend on which QPA backend is chosen, at runtime. On X11, XEvents are
445 not used anymore, and have been replaced with xcb_generic_event_t due to the switch to
446 XCB, which requires porting the application code to XCB as well.
448 * [QTBUG-23529] QHash is now more resilient to a family of denial of service
449 attacks exploiting algorithmic complexity, by supporting two-arguments overloads
450 of the qHash() hashing function.
452 * [QTBUG-4844] QObject::disconnectNotify() is now called when a receiver is destroyed.
455 - [QTBUG-15430] Added a QStateMachine constructor that takes a ChildMode parameter.
456 - [QTBUG-17975] Delayed event posting now works from secondary threads.
457 - [QTBUG-19789] Signal transitions now work correctly when the sender is in a different thread.
458 - [QTBUG-20362] Property assignments now work as expected with nested, parallel states.
459 - [QTBUG-22931] The root state can now be a parallel state group.
460 - [QTBUG-24307] The initial state is now entered before the started() signal is emitted.
461 - [QTBUG-25959] State entry and exit order is now SCXML spec-compliant.
463 * qDebug(), qWarning(), qCritical(), and qFatal() were changed to macros that track the origin
464 of the message in source code. Whether this and other meta-information is printed can be
465 configured (for the default message handler) by setting the new QT_MESSAGE_PATTERN environment
466 variable. qInstallMsgHandler() has been deprecated, and should be replaced with
467 qInstallMessageHandler().
471 * Accessibility has been refactored. The hierachy of accessible objects is implemented via
472 proper parent/child functions instead of using navigate which has been deprecated for this purpose.
473 Table and cell interfaces have been added to qaccessible2.h
475 * Touch events and points have been extended to hold additional
476 information like capability flags, point-specific flags, velocity,
479 * A new set of enabler classes have been added, most importantly QWindow, QScreen,
480 QSurfaceFormat, and QOpenGLContext.
482 * Most of the useful QtOpenGL classes have been polished and moved into
483 QtGui. See QOpenGLFramebufferObject, QOpenGLShaderProgram,
484 QOpenGLFunctions, etc.
486 * QOpenGLPaintDevice has been added to be able to use QPainter to render into
487 the currently bound context.
489 * Behavioral change in QImage::fill() on an image with format Format_RGB888:
490 For consistency with RGB32 and other 32-bit formats, function now expects
491 image data in RGB layout as opposed to BGR layout.
495 * QInputContext removed as well as related getters and setters on QWidget and QApplication.
496 Input contexts are now platform specific.
498 * QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.
500 * In Qt 4, QStyle::standardIconImplementation() and layoutSpacingImplementation()
501 were introduced instead of making the corresponding methods virtual due to binary
502 compatibility reasons. QStyle::standardIcon() and layoutSpacing() have been made
503 (pure) virtual in Qt 5.
505 * In Qt 4, many QStyleOption subclasses were introduced in order to keep
506 binary compatibility -- QStyleOption was designed to be extended this way,
507 in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
508 classes have been removed, and their members merged into the respective
509 base classes. Those classes were left as typedefs to keep existing code
510 working. Still, some minor adjustements could be necessary, especially in code
511 that uses QStyleOption directly and does not initialize all the members using
512 the proper Qt API: due to the version bump, QStyle will try to use the additional
513 QStyleOption members, which are left default-initialized.
515 * QHeaderView - The following functions have been obsoleted.
517 * void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.
519 * bool isMovable() const - use bool sectionsMovable() const instead.
521 * void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.
523 * bool isClickable() const - use bool sectionsClickable() instead.
525 * void setResizeMode(int logicalindex, ResizeMode mode) -
526 use setSectionResizeMode(logicalindex, mode) instead.
528 * ResizeMode resizeMode(int logicalindex) const -
529 use sectionResizeMode(int logicalindex) instead.
531 * QDateEdit and QTimeEdit have re-gained a USER property. These were originally removed
532 before Qt 4.7.0, and are re-added for 5.0. This means that the userProperty for
533 those classes are now QDate and QTime respectively, not QDateTime as they have been
534 for the 4.7 and 4.8 releases.
536 * QGraphicsItem and derived classes - Passing a QGraphicsScene in the items constructor
537 is no longer supported. Construct the item without a scene and then call
538 QGraphicsScene::addItem() to add the item to the scene.
540 * QAbstractItemView and derived classes only emit the clicked() signal on left click now,
541 instead of on all mouse clicks.
543 * QProxyModel has been removed. It is deprecated since early Qt 4 versions and replaced
544 by QAbstractProxyModel and related classes. A copy of QProxyModel is available
545 in the UiHelpers library.
547 * [QTBUG-20503] QFileSystemModel no longer masks out write permissions from the permissions
548 returned from permissions() or data(FilePermissions), even if in read-only mode
549 (QFileSystemModel::isReadOnly()).
553 * QHostAddress::isLoopback() API added. Returns true if the address is
554 one of the IP loopback addresses.
556 * QSslCertificate::serialNumber() now always returns the serial number in
559 * The openssl network backend now reads the ssl configuration file allowing
560 the use of openssl engines.
564 * QtDBus now generates property annotations for the Qt type names
565 in the org.qtproject.QtDBus namespace. When parsing such annotations
566 both the old and new namespaces are accepted.
568 * QtDBus error codes have been updated to be on the org.qtproject.QtDBus.Error
574 * QtConcurrent is no longer in QtCore, but forms its own library now.
575 QMake-based projects can use
577 to include the new library.
579 * QtConcurrent::Exception has been renamed to QException, and is still in QtCore.
580 Ditto QtConcurrent::UnhandledException.
585 * Most of the classes in this module (with the notable exception of QGLWidget)
586 now have equivalents in QtGui, along with the naming change QGL -> QOpenGL.
587 The classes in QtOpenGL that have equivalents in QtGui can now be considered
589 * QGLPixelBuffer is now deprecated and implemented in terms of a hidden
590 QGLWidget and a QOpenGLFramebufferObject. It is recommended that applications
591 using QGLPixelBuffer for offscreen rendering to a texture switch to using
592 QOpenGLFramebufferObject directly instead, for improved performance.
596 * [QTBUG-2124] Added default conversion for long and unsigned long.
597 * [QTBUG-6133] Fixed QScriptContextInfo::functionMetaIndex() for overloaded
599 * [QTBUG-15213] Doc: Added missing properties to the ECMAScript reference.
600 * [QTBUG-15956] Doc: Removed wrong information about Error .stack properties.
601 * [QTBUG-17915] Fixed a crash when a JS property descriptor was only partially
603 * [QTBUG-18188] Fixed a regression that caused contexts created by
604 QScriptEngine::pushContext() to inherit the parent context's scope.
605 * [QTBUG-18201] Suppressed 'LEAK' messages on stderr at application exit.
606 * [QTBUG-20378] Fixed QtScriptTools compilation when some features are disabled.
607 * [QTBUG-20845] Fixed a precision bug in the calculator example.
608 * [QTBUG-21548] Fixed a crash in QScriptEngineDebugger when the QScriptEngine
609 being debugged was deleted.
610 * [QTBUG-21760] Fixed a crash when accessing QObject properties through an
612 * [QTBUG-21896] Fixed a crash when converting an invalid JS value to a string.
613 * [QTBUG-21993] Fixed a bug that caused QObject wrapper objects created with
614 the PreferExistingWrapperObject option to not be garbage collected, even if
615 the object was not referenced anywhere in the scripting environment.
616 * [QTBUG-22152] Fixed build issue on Solaris.
617 * [QTBUG-23871] Fixed a JIT crash on x86-64 caused by out-of-range branch
619 * [QTBUG-26261] Fixed a crash when a queued signal handler no longer existed.
620 * [QTBUG-26590] Fixed a bug that caused QObjects with script connections to
621 not be garbage collected as expected.
625 * [QTBUG-20615] Autotests can now log test output to multiple destinations
626 and log formats simultaneously.
627 * [QTBUG-21645] QSignalSpy now handles QVariant signal parameters more
628 intuitively; the QVariant value is copied directly, instead of being
629 wrapped inside a new QVariant. This means that calling
630 qvariant_cast<QVariant>() on the QSignalSpy item (to "unwrap" the value)
631 is no longer required (but still works).
635 QSqlQueryModel/QSqlTableModel/QSqlRelationalTableModel
637 * The dataChanged() signal is now emitted for changes made to an inserted
638 record that has not yet been committed. Previously, dataChanged() was
639 suppressed in this case for OnRowChange and OnFieldChange. This was probably
640 an attempt to avoid trouble if setData() was called while handling
641 primeInsert(). By emitting dataChanged(), we ensure that all views are aware
644 * While handling primeInsert() signal, the record must be manipulated using
645 the provided reference. Do not attempt to manipulate the records using the
646 model methods setData() or setRecord().
648 * removeRows() no longer emits extra beforeDelete signal for out of range row.
650 * removeRows() now requires the whole range of targetted rows to be valid
651 before doing anything. Previously, it would remove what it could and
652 ignore the rest of the range.
654 * removeRows(), for OnFieldChange and OnRowChange, allows only 1 row to be
655 removed and only if there are no other changed rows.
657 * setRecord() and insertRecord()
658 -The generated flags from the source record are preserved in the model
659 and determine which fields are included when changes are applied to
661 -Require all fields to map correctly. Previously fields that didn't
662 map were simply ignored.
663 -For OnManualSubmit, insertRecord() no longer leaves behind an empty
664 row if setRecord() fails.
665 -setRecord() now automatically submits for OnRowChange.
667 * QSqlQueryModel::indexInQuery() is now virtual. See
668 QSqlTableModel::indexInQuery() as example of how to implement in a
671 * QSqlQueryMode::setQuery() emits fewer signals. The modelAboutToBeReset()
672 and modelReset() signals suffice to inform views that they must reinterrogate
675 * QSqlTableModel::selectRow(): This is a new method that refreshes a single
676 row in the model from the database.
678 * QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
679 Previously, after changes were submitted in these edit strategies, select()
680 was called which removed and inserted all rows. This ruined navigation
681 in QTableView. Now, with these edit strategies, there is no implicit select()
682 done after committing. This includes deleted rows which remain in
683 the model as blank rows until the application calls select(). Instead,
684 selectRow() is called to refresh only the affected row.
686 * QSqlTableModel::isDirty(): New overloaded method to check whether model
687 has any changes to submit. QTBUG-3108
689 * QSqlTableModel::setData() and setRecord() no longer revert pending changes
690 that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
691 Instead, pending (failed) changes cause new changes inappropriate to the
692 edit strategy to be refused. The application should resolve or revert pending
693 changes. insertRows() and insertRecord() also respect the edit strategy.
695 * QSqlTableModel::setData() and setRecord() in OnRowChange no longer have the
696 side effect of submitting the cached row when invoked on a different row.
698 * QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
699 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
700 are now virtual. Their xxxImplemenation counterparts have been removed
701 now that QSqlDriver subclasses can reimplement these directly.
703 ****************************************************************************
705 ****************************************************************************
709 * QVariant::Bool type now mapped to integers 0/1 in SQL instead of strings
710 'true' and 'false'. Sqlite does not have a boolean column type and it is
711 customary to use integer. QTBUG-23895
715 * the error message returned in QSqlError::text() has the SQLSTATE error code
716 appended in parantheses.
718 ****************************************************************************
719 * Platform Specific Changes *
720 ****************************************************************************
728 * Accessibility framework uses IAccessible2
729 * ANGLE can be used to provide Open GL ES 2.0 (see http://code.google.com/p/angleproject/)
735 Qt for Embedded Linux
736 ---------------------
743 ****************************************************************************
744 * Compiler Specific Changes *
745 ****************************************************************************
748 ****************************************************************************
750 ****************************************************************************
754 * Remove qttest_p4.prf file. From now on we should explicitly enable the
755 things from it which we want. Autotest .pro files should stop using
756 'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.
761 * [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
762 translation attributes which apply to all items.
763 They are by default translatable.
772 * [QTBUG-20785] The moc now has a -b<file> option to #include an additional
773 file at the beginning of the generated file.
784 * QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
790 * The Mac OS X -dwarf2 configure argument has been removed. DWARF2 is always
791 used on Mac OS X now.
796 ****************************************************************************
798 ****************************************************************************
799 - The text codecs that were previously plugins are now built into QtCore.
800 - Code using Q_EXPORT_PLUGIN macros will no longer compile. Use
801 Q_PLUGIN_METADATA instead. Note that this requires that the class
802 be default-constructible.
804 ****************************************************************************
805 * Important Behavior Changes *
806 ****************************************************************************
810 * The implementation of QPointer has been changed to use QWeakPointer. The
811 old guard mechanism has been removed. This causes a slight change
812 in behavior when using QPointer:
814 * When using QPointer on a QWidget (or a subclass of QWidget), previously
815 the QPointer would be cleared by the QWidget destructor. Now, the QPointer
816 is cleared by the QObject destructor (since this is when QWeakPointers are
817 cleared). Any QPointers tracking a widget will NOT be cleared before the
818 QWidget destructor destroys the children for the widget being tracked.
822 * QUrl has been changed to operate only on percent-encoded
823 forms. Fully-decoded forms, where the percent character stands for itself,
824 are no longer possible. For that reason, the getters and setters with
825 "encoded" in the name are deprecated, except for QUrl::toEncoded() and
828 QUrl now operates in a mode where it decodes as much as it can of the
829 percent-encoding sequences. In addition, the setter methods possess a mode
830 in which a '%' character not part of a percent-encoding sequence will cause
831 the parser to correct the input. Therefore, most software will not require
832 changes to adapt, since the getter methods will continue returning the
833 components in their most-decoded form as they did before and the setter
834 methods will accept input as they did before..
836 The most notable difference is when dealing with
837 QUrl::toString(). Previously, this function would return percent characters
838 in the URL by themselves. Now, it will return "%25", like
843 * Definition of QVariant::UserType changed. Currently it is the same as
844 QMetaType::User, which means that it points to the first registered custom
845 type, instead of a nonexistent type.
849 * Interpretation of QMetaType::Void was changed. Before, in some cases
850 it was returned as an invalid type id, but sometimes it was used as a valid
851 type (C++ "void"). In Qt5, new QMetaType::UnknownType was introduced to
852 distinguish between these two. QMetaType::UnknownType is an invalid type id
853 signaling that a type is unknown to QMetaType, and QMetaType::Void
854 is a valid type id of C++ void type. The difference will be visible for
855 example in call to QMetaType::typeName(), this function will return null for
856 QMetaType::UnknownType and a pointer to "void" string for
858 Please, notice that QMetaType::UnknownType has value 0, which previously was
859 reserved for QMetaType::Void.
864 * The static function QMessageBox::question has changed the default argument
865 for buttons. Before the default was to have an Ok button. That is changed
866 to having a yes and a no button.