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 ****************************************************************************
15 - QSslCertificate::subjectInfo() and QSslCertificate::issuerInfo() now
16 return a QStringList instead of a QString
18 - QSslCertificate::isValid() has been deprecated. Originally it only checked
19 the certificate dates, but later checking for blacklisting was added. Now
20 there's a more specific QSslCertificate::isBlacklisted() method.
22 - Unite clipping support has been removed from QPainter. The alternative is
23 to unite QRegion's and using the result on QPainter.
25 - QLibrary::resolve() now returns a function pointer instead of a void
28 - QSslCertificate::alternateSubjectNames() is deprecated (but can be enabled
29 via QT_DISABLE_DEPRECATED_BEFORE), use
30 QSslCertificate::subjectAlternativeNames() instead.
32 - QLibraryInfo::buildKey() has been removed. Likewise, the QT_BUILD_KEY
33 preprocessor #define has also been removed. The build-key is obsolete
34 and is no longer necessary.
36 - QCoreApplication::translate() will no longer return the source text when
37 the translation is empty. Use lrelease -removeidentical for optimization.
39 - QString and QByteArray constructors that take a size argument will now treat
40 negative sizes to indicate nul-terminated strings (a nul-terminated array of
41 QChar, in the case of QString). In Qt 4, negative sizes were ignored and
42 result in empty QString and QByteArray, respectively. The size argument to
43 those constructors now has a default value of -1, thus replacing the separate
44 constructors that did the same.
46 - Qt::escape() is deprecated (but can be enabled via
47 QT_DISABLE_DEPRECATED_BEFORE), use QString::toHtmlEscaped() instead.
49 - QBool is gone. QString::contains, QByteArray::contains, and QList::contains
50 used to return an internal QBool class so that the Qt3 code
51 "if (a.contains() == 2)" wouldn't compile anymore. Such code cannot exist
52 in Qt4, so these methods return a bool now. If your code used the undocumented
53 QBool, simply replace it with bool.
55 - qIsDetached<> has been removed without replacement.
58 * QMetaType::construct() has been renamed to QMetaType::create().
59 * QMetaType::unregisterType() has been removed.
62 * QMetaMethod::signature() has been renamed to QMetaMethod::methodSignature(),
63 and the return type has been changed to QByteArray. This was done to be able
64 to generate the signature string on demand, rather than always storing it in
66 * QMetaMethod::typeName() no longer returns an empty string when the return
67 type is void; it returns "void". The recommended way of checking whether a
68 method returns void is to compare the return value of QMetaMethod::returnType()
72 * The plain-text, xml and lightxml test output formats have been changed to
73 show a test result for every row of test data in data-driven tests. In
74 Qt4, only fails and skips were shown for individual data rows and passes
75 were not shown for individual data rows, preventing accurate calculation
76 of test run rates and pass rates.
77 * The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
78 These macros formerly lived in tests/shared/util.h but are now provided
79 by including the <QtTest/QtTest> header. In addition,
80 QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
81 allowing for specifying custom timeout values.
82 * The QTEST_NOOP_MAIN macro has been removed from the API. If a test is
83 known at compile-time to be inapplicable for a particular build it should
84 be omitted via .pro file logic, or the test should call QSKIP in the
85 initTestCase() method to skip the entire test and report a meaningful
86 explanation in the test log.
87 * The DEPENDS_ON macro has been removed from the API. This macro did nothing
88 and misled some users to believe that they could make test functions depend
89 on each other or impose an execution order on test functions.
90 * The QTest::qt_snprintf function has been removed from the API. This was an
91 internal testlib function that was exposed in the public API due to its use
92 in a public macro. Any calls to this function should be replaced by a call
93 to qsnprintf(), which comes from the <QtCore/QByteArray> header.
94 * The QTest::pixmapsAreEqual() function has been removed from the API.
95 Comparison of QPixmap objects should be done using QCOMPARE, which provides
96 more informative output in the event of a failure.
97 * The QSKIP macro no longer has the "mode" parameter, which caused problems
98 for calculating test metrics, as the SkipAll mode hid information about
99 what test data was skipped. Calling QSKIP in a test function now behaves
100 like SkipSingle -- skipping a non-data-driven test function or skipping
101 only the current data row of a data-driven test function. Every skipped
102 data row is now reported in the test log.
104 - The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .
107 * Internal QAccessible::State enum value HasInvokeExtension removed
108 - QAccessibleInterface:
109 * The "child" integer parameters have been removed. This moves the api
110 to be closer to IAccessible2.
111 This means several functions lose their integer parameter:
112 text(Text t, int child) -> text(Text t), rect(int child) -> rect()
113 setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
114 role(int child) -> role(), state(int child) -> state()
115 * parent() and child() was added in order to do hierarchical navigation.
116 * relations() was added as a replacement to relationTo()
117 * As a consequence of the above two points, navigate() was removed.
118 * Accessible-Action related functions have been removed. QAccessibleInterface
119 subclasses are expected to implement the QAccessibleActionInterface instead.
120 These functions have been removed:
121 QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
122 QAccessibleInterface::doAction
123 - QAccessibleEvent also loses the child parameter.
124 QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
125 QAccessibleEvent::child() removed.
126 - QAccessibleActionInterface:
127 * Refactored to be based on action names. All functions have been changed from using
128 int parameters to strings.
130 - QSound has been moved from QtGui to QtMultimedia
132 - QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
133 as all coordinates are floating point based now.
137 * The DeviceType enum and deviceType() have been deprecated due to
138 the introduction of QTouchDevice.
140 * The signature of the constructor has changed. It now takes a
141 QTouchDevice pointer instead of just a DeviceType value.
143 * TouchPointState no longer includes TouchPointStateMask and
144 TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
147 * QWidget *widget() has been removed and is replaced by QObject
148 *target() in order to avoid QWidget dependencies.
150 * QEvent::TouchCancel has been introduced. On systems where it makes
151 sense this event type can be used to differentiate between a
152 regular TouchEnd and abrupt touch sequence cancellations caused by
153 the compositor, for example when a system gesture gets recognized.
157 * Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
158 cases where a forward declared type should be used as a metatype,
159 Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.
163 * The signature of the createEditor and valuePropertyName methods
164 have been changed to take arguments of type int instead of QVariant::Type.
166 - QWindowSystemInterface:
168 * The signature of all handleTouchEvent() variants have changed,
169 taking a QTouchDevice* instead of just a DeviceType value.
170 Platform or generic plug-ins have to create and register at least
171 one QTouchDevice before sending the first touch event.
173 * The event type parameter is removed from handleTouchEvent().
175 - The previously exported function qt_translateRawTouchEvent() has been removed.
176 Use QWindowSystemInterface::handleTouchEvent() instead.
178 - QAbstractEventDispatcher
180 * The signature for the pure-virtual registerTimer() has changed. Subclasses
181 of QAbstractEventDispatcher will need to be updated to reimplement the new
182 pure-virtual 'virtual void registerTimer(int timerId, int interval,
183 Qt::TimerType timerType, QObject *object) = 0;'
185 * QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
186 now a struct with 3 members: struct TimerInfo { int timerId; int interval;
187 Qt::TimerType timerType; }; Reimplementations of
188 QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
189 3 arguments to the TimerInfo constructor (instead of 2).
193 * Removed implicit conversion operator QUuid::operator QString(), instead
194 QUuid::toString() function should be used.
196 - The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
197 been removed, QNetworkAccessManager should be used instead.
199 - The QFtp class is no longer exported, QNetworkAccessManager should be used
204 * On Windows, QProcess::ForwardedChannels will not forward the output of GUI
205 applications anymore, if they do not create a console.
207 - QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
208 connectToHostImplementation() and disconnectFromHostImplementation() don't exist.
210 - QTcpServer::incomingConnection() now takes a qintptr instead of an int.
212 - QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.
214 - QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
215 QDir::toNativeSeparators() instead.
217 - QIconEngineV2 was merged into QIconEngine
218 You might need to adjust your code if it used a QIconEngine.
221 * Projects which explicitly set an empty TARGET are considered broken now.
222 * The makespec and .qmake.cache do not see build pass specific variables any more.
223 * load()/include() with a target namespace and infile()/$$fromfile() now start with
224 an entirely pristine context.
225 * Configure's -sysroot and -hostprefix are now handled slightly differently.
226 The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
227 the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
228 The new QT_HOST_... properties can be used to refer to the Qt host tools.
229 * Several functions and built-in variables were modified to return normalized paths.
231 - QTextCodecPlugin has been removed since it is no longer used. All text codecs
232 are now built into QtCore.
234 - QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
235 to use or check both.
237 - QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
238 QAbstractFileEngineHandler were removed from public API and are no longer
239 exported. They may temporarily live as private implementation details, but
240 they may be altogether dropped or otherwise changed at will in the future.
243 * toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
244 longer take a parameter for base, they will only perform localised base 10
245 conversions. For converting other bases use the QString methods instead.
247 - QSystemLocale has been removed from the public API.
249 - QSqlQueryModel::indexInQuery() is now virtual. See note below under QtSql.
251 - QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
252 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
253 are now virtual. See note below under QtSql.
255 - qMacVersion() has been removed. Use QSysInfo::macVersion() or
256 QSysInfo::MacintoshVersion instead.
258 - QColorDialog::customColor() now returns a QColor value instead of QRgb.
259 QColorDialog::setCustomColor() and QColorDialog::setStandardColor() now
260 take a QColor value for their second parameter instead of QRgb.
262 ****************************************************************************
264 ****************************************************************************
269 - The directory structure of the qtbase unit-tests has been reworked to
270 more closely match the directory structure of the code under test.
271 Integration tests have been moved to tests/auto/integrationtests.
273 Third party components
274 ----------------------
279 ****************************************************************************
281 ****************************************************************************
285 * drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
286 value is returned for an unassigned codepoints now.
288 * layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
289 layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
290 should now also connect to (and disconnect from) the rowsAboutToBeMoved and
293 * The default value of the property QSortFilterProxyModel::dynamicSortFilter was
294 changed from false to true.
296 * The signature of the virtual QAbstractItemView::dataChanged method has changed to
297 include the roles which have changed. The signature is consistent with the dataChanged
300 * QFileSystemWatcher is now able to return failure in case of errors whilst
301 altering the watchlist in both the singular and QStringList overloads of
302 addPath and removePath.
304 * QString::mid, QString::midRef and QByteArray::mid, if the position passed
305 is equal to the length (that is, right after the last character/byte),
306 now return an empty QString, QStringRef or QByteArray respectively.
307 in Qt 4 they returned a null QString or a null QStringRef.
309 * QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
310 toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
311 default or system locale, they will always use the C locale. This is to
312 guarantee consistent default conversion of strings. For locale-aware conversions
313 use the equivalent QLocale methods.
315 * QDate, QTime, and QDateTime have undergone important behavioural changes:
316 * QDate only implements the Gregorian calendar, the switch to the Julian
317 calendar before 1582 has been removed. This means all QDate methods will
318 return different results for dates prior to 15 October 1582, and there is
319 no longer a gap between 4 October 1582 and 15 October 1582.
320 * QDate::setYMD() is deprecated, use QDate::setDate() instead
321 * Most methods now apply strict validity checks and will return appropriate
322 and consistent values when invalid. For example, QDate::year() will return
323 0 and QDate::shortMonthName() will return QString().
324 * Adding days to a null QDate or seconds to a null QTime will no longer return
326 * QDate stores the Julian Day as a qint64 extending date support across a
327 more interesting range, see the class documentation for details.
328 * Conversion to YMD form dates is only accurate between to 4800 BCE to
330 * The QDate::addDays() and QDateTime::addDays() methods now take a qint64
331 * The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64
333 * QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
334 been removed. This was removed due to issues with breaking other code from
335 libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
336 extent) performance issues.
338 * QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed,
339 QCoreApplication::Encoding value CodecForTr is now obsolete, use
340 DefaultCodec instead. For reasoning, see the codecForCStrings() removal above.
342 * QIntValidator and QDoubleValidator no longer fall back to using the C locale if
343 the requested locale fails to validate the input.
345 * A new set of classes for doing pattern matching with Perl-compatible regular
346 expressions has been added: QRegularExpression, QRegularExpressionMatch and
347 QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
348 powerful and flexible regular expression engine.
350 * QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
351 * The enum values simply didn't make sense in the first place and should simply be dropped.
353 * [QTBUG-23529] QHash is now more resilient to a family of denial of service
354 attacks exploiting algorithmic complexity, by supporting two-arguments overloads
355 of the qHash() hashing function.
359 * Accessibility has been refactored. The hierachy of accessible objects is implemented via
360 proper parent/child functions instead of using navigate which has been deprecated for this purpose.
361 Table and cell interfaces have been added to qaccessible2.h
363 * Touch events and points have been extended to hold additional
364 information like capability flags, point-specific flags, velocity,
367 * A new set of enabler classes have been added, most importantly QWindow, QScreen,
368 QSurfaceFormat, and QOpenGLContext.
370 * Most of the useful QtOpenGL classes have been polished and moved into
371 QtGui. See QOpenGLFramebufferObject, QOpenGLShaderProgram,
372 QOpenGLFunctions, etc.
374 * QOpenGLPaintDevice has been added to be able to use QPainter to render into
375 the currently bound context.
379 * QInputContext removed as well as related getters and setters on QWidget and QApplication.
380 Input contexts are now platform specific.
382 * QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.
384 * In Qt 4, many QStyleOption subclasses were introduced in order to keep
385 binary compatibility -- QStyleOption was designed to be extended this way,
386 in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
387 classes have been removed, and their members merged into the respective
388 base classes. Those classes were left as typedefs to keep existing code
389 working. Still, some minor adjustements could be necessary, especially in code
390 that uses QStyleOption directly and does not initialize all the members using
391 the proper Qt API: due to the version bump, QStyle will try to use the additional
392 QStyleOption members, which are left default-initialized.
394 * QHeaderView - The following functions have been obsoleted.
396 * void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.
398 * bool isMovable() const - use bool sectionsMovable() const instead.
400 * void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.
402 * bool isClickable() const - use bool sectionsClickable() instead.
404 * void setResizeMode(int logicalindex, ResizeMode mode) -
405 use setSectionResizeMode(logicalindex, mode) instead.
407 * ResizeMode resizeMode(int logicalindex) const -
408 use sectionResizeMode(int logicalindex) instead.
410 * QDateEdit and QTimeEdit have re-gained a USER property. These were originally removed
411 before Qt 4.7.0, and are re-added for 5.0. This means that the userProperty for
412 those classes are now QDate and QTime respectively, not QDateTime as they have been
413 for the 4.7 and 4.8 releases.
417 * QHostAddress::isLoopback() API added. Returns true if the address is
418 one of the IP loopback addresses.
420 * QSslCertificate::serialNumber() now always returns the serial number in
423 * The openssl network backend now reads the ssl configuration file allowing
424 the use of openssl engines.
428 * QtDBus now generates property annotations for the Qt type names
429 in the org.qtproject.QtDBus namespace. When parsing such annotations
430 both the old and new namespaces are accepted.
432 * QtDBus error codes have been updated to be on the org.qtproject.QtDBus.Error
438 * Most of the classes in this module (with the notable exception of QGLWidget)
439 now have equivalents in QtGui, along with the naming change QGL -> QOpenGL.
440 The classes in QtOpenGL that have equivalents in QtGui can now be considered
449 * [QTBUG-20615] Autotests can now log test output to multiple destinations
450 and log formats simultaneously.
454 QSqlTableModel/QSqlRelationalTableModel
456 * The dataChanged() signal is now emitted for changes made to an inserted
457 record that has not yet been committed. Previously, dataChanged() was
458 suppressed in this case for OnRowChange and OnFieldChange. This was probably
459 an attempt to avoid trouble if setData() was called while handling
460 primeInsert(). By emitting dataChanged(), we ensure that all views are aware
463 * While handling primeInsert() signal, the record must be manipulated using
464 the provided reference. Do not attempt to manipulate the records using the
465 model methods setData() or setRecord().
467 * removeRows() no longer emits extra beforeDelete signal for out of range row.
469 * removeRows() now requires the whole range of targetted rows to be valid
470 before doing anything. Previously, it would remove what it could and
471 ignore the rest of the range.
473 * removeRows(), for OnFieldChange and OnRowChange, allows only 1 row to be
474 removed and only if there are no other changed rows.
476 * setRecord() and insertRecord()
477 -Only use fields where generated flag is set to true. This is
478 is consistent with the meaning of the flag.
479 -Require all fields to map correctly. Previously fields that didn't
480 map were simply ignored.
481 -For OnManualSubmit, insertRecord() no longer leaves behind an empty
482 row if setRecord() fails.
483 -setRecord() now automatically submits for OnRowChange.
485 * QSqlQueryModel::indexInQuery() is now virtual. See
486 QSqlTableModel::indexInQuery() as example of how to implement in a
489 * QSqlTableModel::selectRow(): This is a new method that refreshes a single
490 row in the model from the database.
492 * QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
493 Previously, after changes were submitted in these edit strategies, select()
494 was called which removed and inserted all rows. This ruined navigation
495 in QTableView. Now, with these edit strategies, there is no implicit select()
496 done after committing. This includes deleted rows which remain in
497 the model as blank rows until the application calls select(). Instead,
498 selectRow() is called to refresh only the affected row.
500 * QSqlTableModel::isDirty(): New overloaded method to check whether model
501 has any changes to submit. QTBUG-3108
503 * QSqlTableModel::setData() and setRecord() no longer revert pending changes
504 that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
505 Instead, pending (failed) changes cause new changes inappropriate to the
506 edit strategy to be refused. The application should resolve or revert pending
507 changes. insertRows() and insertRecord() also respect the edit strategy.
509 * QSqlTableModel::setData() and setRecord() in OnRowChange no longer have the
510 side effect of submitting the cached row when invoked on a different row.
512 * QSqlDriver::subscribeToNotification, unsubscribeFromNotification,
513 subscribedToNotifications, isIdentifierEscaped, and stripDelimiters
514 are now virtual. Their xxxImplemenation counterparts have been removed
515 now that QSqlDriver subclasses can reimplement these directly.
517 ****************************************************************************
519 ****************************************************************************
523 * QVariant::Bool type now mapped to integers 0/1 in SQL instead of strings
524 'true' and 'false'. Sqlite does not have a boolean column type and it is
525 customary to use integer. QTBUG-23895
527 ****************************************************************************
528 * Platform Specific Changes *
529 ****************************************************************************
537 * Accessibility framework uses IAccessible2
544 Qt for Embedded Linux
545 ---------------------
552 ****************************************************************************
553 * Compiler Specific Changes *
554 ****************************************************************************
557 ****************************************************************************
559 ****************************************************************************
563 * Remove qttest_p4.prf file. From now on we should explicitly enable the
564 things from it which we want. Autotest .pro files should stop using
565 'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.
570 * [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
571 translation attributes which apply to all items.
572 They are by default translatable.
581 * [QTBUG-20785] The moc now has a -b<file> option to #include an additional
582 file at the beginning of the generated file.
593 * QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
603 ****************************************************************************
605 ****************************************************************************
606 - The text codecs that were previously plugins are now built into QtCore.
608 ****************************************************************************
609 * Important Behavior Changes *
610 ****************************************************************************
614 * The implementation of QPointer has been changed to use QWeakPointer. The
615 old guard mechanism has been removed. This causes a slight change
616 in behavior when using QPointer:
618 * When using QPointer on a QWidget (or a subclass of QWidget), previously
619 the QPointer would be cleared by the QWidget destructor. Now, the QPointer
620 is cleared by the QObject destructor (since this is when QWeakPointers are
621 cleared). Any QPointers tracking a widget will NOT be cleared before the
622 QWidget destructor destroys the children for the widget being tracked.
627 * Definition of QVariant::UserType changed. Currently it is the same as
628 QMetaType::User, which means that it points to the first registered custom
629 type, instead of a nonexistent type.
633 * Interpretation of QMetaType::Void was changed. Before, in some cases
634 it was returned as an invalid type id, but sometimes it was used as a valid
635 type (C++ "void"). In Qt5, new QMetaType::UnknownType was introduced to
636 distinguish between these two. QMetaType::UnknownType is an invalid type id
637 signaling that a type is unknown to QMetaType, and QMetaType::Void
638 is a valid type id of C++ void type. The difference will be visible for
639 example in call to QMetaType::typeName(), this function will return null for
640 QMetaType::UnknownType and a pointer to "void" string for
642 Please, notice that QMetaType::UnknownType has value 0, which previously was
643 reserved for QMetaType::Void.
648 * The static function QMessageBox::question has changed the default argument
649 for buttons. Before the default was to have an Ok button. That is changed
650 to having a yes and a no button.