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Some of the changes listed in this file include issue tracking numbers
corresponding to tasks in the Qt Bug Tracker:

  http://bugreports.qt-project.org/

Each of these identifiers can be entered in the bug tracker to obtain more
information about a particular change.


****************************************************************************
*                       Source incompatible changes                        *
****************************************************************************


- QSslCertificate::subjectInfo() and QSslCertificate::issuerInfo() now
  return a QStringList instead of a QString

- QSslCertificate::isValid() has been deprecated. Originally it only checked
  the certificate dates, but later checking for blacklisting was added. Now
  there's a more specific QSslCertificate::isBlacklisted() method.

- Unite clipping support has been removed from QPainter. The alternative is
  to unite QRegion's and using the result on QPainter.

- QLibrary::resolve() now returns a function pointer instead of a void
  pointer.

- QSslCertificate::alternateSubjectNames() is deprecated (but can be enabled
  via QT_DISABLE_DEPRECATED_BEFORE), use
  QSslCertificate::subjectAlternativeNames() instead.

- QLibraryInfo::buildKey() has been removed. Likewise, the QT_BUILD_KEY
  preprocessor #define has also been removed. The build-key is obsolete
  and is no longer necessary.

- QCoreApplication::translate() will no longer return the source text when
  the translation is empty. Use lrelease -removeidentical for optimization.

- Qt::escape() is deprecated (but can be enabled via
  QT_DISABLE_DEPRECATED_BEFORE), use QString::toHtmlEscaped() instead.

- QBool is gone. QString::contains, QByteArray::contains, and QList::contains
  used to return an internal QBool class so that the Qt3 code
  "if (a.contains() == 2)" wouldn't compile anymore. Such code cannot exist
  in Qt4, so these methods return a bool now. If your code used the undocumented
  QBool, simply replace it with bool.

- qIsDetached<> has been removed without replacement.

- QMetaType:
  * QMetaType::construct() has been renamed to QMetaType::create().
  * QMetaType::unregisterType() has been removed.

- QTestLib:
  * The plain-text, xml and lightxml test output formats have been changed to
    show a test result for every row of test data in data-driven tests.  In
    Qt4, only fails and skips were shown for individual data rows and passes
    were not shown for individual data rows, preventing accurate calculation
    of test run rates and pass rates.
  * The QTRY_VERIFY and QTRY_COMPARE macros have been moved into QTestLib.
    These macros formerly lived in tests/shared/util.h but are now provided
    by including the <QtTest/QtTest> header. In addition,
    QTRY_VERIFY_WITH_TIMEOUT and QTRY_COMPARE_WITH_TIMEOUT are provided,
    allowing for specifying custom timeout values.
  * The QTEST_NOOP_MAIN macro has been removed from the API.  If a test is
    known at compile-time to be inapplicable for a particular build it should
    be omitted via .pro file logic, or the test should call QSKIP in the
    initTestCase() method to skip the entire test and report a meaningful
    explanation in the test log.
  * The DEPENDS_ON macro has been removed from the API.  This macro did nothing
    and misled some users to believe that they could make test functions depend
    on each other or impose an execution order on test functions.
  * The QTest::qt_snprintf function has been removed from the API.  This was an
    internal testlib function that was exposed in the public API due to its use
    in a public macro.  Any calls to this function should be replaced by a call
    to qsnprintf(), which comes from the <QtCore/QByteArray> header.
  * The QTest::pixmapsAreEqual() function has been removed from the API.
    Comparison of QPixmap objects should be done using QCOMPARE, which provides
    more informative output in the event of a failure.
  * The QSKIP macro no longer has the "mode" parameter, which caused problems
    for calculating test metrics, as the SkipAll mode hid information about
    what test data was skipped.  Calling QSKIP in a test function now behaves
    like SkipSingle -- skipping a non-data-driven test function or skipping
    only the current data row of a data-driven test function.  Every skipped
    data row is now reported in the test log.

- The QSsl::TlsV1 enum value was renamed to QSsl::TlsV1_0 .

- QAccessible:
  * Internal QAccessible::State enum value HasInvokeExtension removed
- QAccessibleInterface:
  * The "child" integer parameters have been removed. This moves the api
    to be closer to IAccessible2.
    This means several functions lose their integer parameter:
    text(Text t, int child) -> text(Text t), rect(int child) -> rect()
    setText(Text t, int child, const QString &text) -> setText(Text t, const QString &text)
    role(int child) -> role(), state(int child) -> state()
  * parent() and child() was added in order to do hierarchical navigation.
  * relations() was added as a replacement to relationTo()
  * As a consequence of the above two points, navigate() was removed.
  * Accessible-Action related functions have been removed. QAccessibleInterface
    subclasses are expected to implement the QAccessibleActionInterface instead.
    These functions have been removed:
    QAccessibleInterface::userActionCount, QAccessibleInterface::actionText,
    QAccessibleInterface::doAction
- QAccessibleEvent also loses the child parameter.
    QAccessibleEvent(Type type, int child) -> QAccessibleEvent(Type type)
    QAccessibleEvent::child() removed.
- QAccessibleActionInterface:
  * Refactored to be based on action names. All functions have been changed from using
    int parameters to strings.

- QSound has been moved from QtGui to QtMultimedia

- QTabletEvent::QTabletEvent does not take a hiResGlobalPos argument anymore,
  as all coordinates are floating point based now.

- QTouchEvent:

  * The DeviceType enum and deviceType() have been deprecated due to
    the introduction of QTouchDevice.

  * The signature of the constructor has changed. It now takes a
    QTouchDevice pointer instead of just a DeviceType value.

  * TouchPointState no longer includes TouchPointStateMask and
    TouchPointPrimary. QTouchEvent::TouchPoint::isPrimary() has
    been removed.

  * QWidget *widget() has been removed and is replaced by QObject
    *target() in order to avoid QWidget dependencies.

  * QEvent::TouchCancel has been introduced. On systems where it makes
    sense this event type can be used to differentiate between a
    regular TouchEnd and abrupt touch sequence cancellations caused by
    the compositor, for example when a system gesture gets recognized.

- QMetaType

  * Q_DECLARE_METATYPE(Foo*) now requires that Foo is fully defined. In
    cases where a forward declared type should be used as a metatype,
    Q_DECLARE_OPAQUE_POINTER(Foo*) can be used to allow that.

- QItemEditorFactory

  * The signature of the createEditor and valuePropertyName methods
    have been changed to take arguments of type int instead of QVariant::Type.

- QWindowSystemInterface:

  * The signature of all handleTouchEvent() variants have changed,
    taking a QTouchDevice* instead of just a DeviceType value.
    Platform or generic plug-ins have to create and register at least
    one QTouchDevice before sending the first touch event.

  * The event type parameter is removed from handleTouchEvent().

- The previously exported function qt_translateRawTouchEvent() has been removed.
  Use QWindowSystemInterface::handleTouchEvent() instead.

- QAbstractEventDispatcher

  * The signature for the pure-virtual registerTimer() has changed. Subclasses
  of QAbstractEventDispatcher will need to be updated to reimplement the new
  pure-virtual 'virtual void registerTimer(int timerId, int interval,
  Qt::TimerType timerType, QObject *object) = 0;'

  * QAbstractEventDispatcher::TimerInfo is no longer a QPair<int, int>. It is
  now a struct with 3 members: struct TimerInfo { int timerId; int interval;
  Qt::TimerType timerType; }; Reimplementations of
  QAbstractEventDispatcher::registeredTimers() will need to be updated to pass
  3 arguments to the TimerInfo constructor (instead of 2).

- QUuid

  * Removed implicit conversion operator QUuid::operator QString(), instead
  QUuid::toString() function should be used.

- The QHttp, QHttpHeader, QHttpResponseHeader and QHttpRequestHeader classes have
  been removed, QNetworkAccessManager should be used instead.

- The QFtp class is no longer exported, QNetworkAccessManager should be used
  instead.

- QProcess

  * On Windows, QProcess::ForwardedChannels will not forward the output of GUI
    applications anymore, if they do not create a console.

- QAbstractSocket's connectToHost() and disconnectFromHost() are now virtual and
  connectToHostImplementation() and disconnectFromHostImplementation() don't exist.

- QTcpServer::incomingConnection() now takes a qintptr instead of an int.

- QNetworkConfiguration::bearerName() removed, and bearerTypeName() should be used.

- QDir::convertSeparators() (deprecated since Qt 4.2) has been removed. Use
  QDir::toNativeSeparators() instead.

- QIconEngineV2 was merged into QIconEngine
  You might need to adjust your code if it used a QIconEngine.

- qmake
  * Projects which explicitly set an empty TARGET are considered broken now.
  * The makespec and .qmake.cache do not see build pass specific variables any more.
  * load()/include() with a target namespace and infile()/$$fromfile() now start with
    an entirely pristine context.
  * Configure's -sysroot and -hostprefix are now handled slightly differently.
    The QT_INSTALL_... properties are now automatically prefixed with the sysroot;
    the raw values are available as QT_INSTALL_.../raw and the sysroot as QT_SYSROOT.
    The new QT_HOST_... properties can be used to refer to the Qt host tools.
  * Several functions and built-in variables were modified to return normalized paths.

- QTextCodecPlugin has been removed since it is no longer used. All text codecs
  are now built into QtCore.

- QDir::NoDotAndDotDot is QDir::NoDot|QDir::NoDotDot therefore there is no need
  to use or check both.

- QFSFileEngine, QAbstractFileEngine, QAbstractFileEngineIterator and
  QAbstractFileEngineHandler were removed from public API and are no longer
  exported. They may temporarily live as private implementation details, but
  they may be altogether dropped or otherwise changed at will in the future.

- QLocale
  * toShort(), toUShort(), toInt(), toUInt(), toLongLong() and toULongLong() no
    longer take a parameter for base, they will only perform localised base 10
    conversions. For converting other bases use the QString methods instead.

- QSystemLocale has been removed from the public API.

- QSqlQueryModel::indexInQuery() is now virtual. See note below under QSql.

- qMacVersion() has been removed. Use QSysInfo::macVersion() or
  QSysInfo::MacintoshVersion instead.

****************************************************************************
*                           General                                        *
****************************************************************************

General Improvements
--------------------

- The directory structure of the qtbase unit-tests has been reworked to
  more closely match the directory structure of the code under test.
  Integration tests have been moved to tests/auto/integrationtests.

Third party components
----------------------

-


****************************************************************************
*                          Library                                         *
****************************************************************************

QtCore
------
* drop a bogus QChar::NoCategory enum value; the proper QChar::Other_NotAssigned
  value is returned for an unassigned codepoints now.

* layoutAboutToBeChanged is no longer emitted by QAbstractItemModel::beginMoveRows.
  layoutChanged is no longer emitted by QAbstractItemModel::endMoveRows. Proxy models
  should now also connect to (and disconnect from) the rowsAboutToBeMoved and
  rowsMoved signals.

* The default value of the property QSortFilterProxyModel::dynamicSortFilter was
  changed from false to true.

* The signature of the virtual QAbstractItemView::dataChanged method has changed to
  include the roles which have changed. The signature is consistent with the dataChanged
  signal in the model.

* QFileSystemWatcher is now able to return failure in case of errors whilst
  altering the watchlist in both the singular and QStringList overloads of
  addPath and removePath.

* QString::mid, QString::midRef and QByteArray::mid, if the position passed
  is equal to the length (that is, right after the last character/byte),
  now return an empty QString, QStringRef or QByteArray respectively.
  in Qt 4 they returned a null QString or a null QStringRef.

* QString methods toLongLong(), toULongLong(), toLong(), toULong(), toInt(),
  toUInt(), toShort(), toUShort(), toDouble(), and toFloat() no longer use the
  default or system locale, they will always use the C locale. This is to
  guarantee consistent default conversion of strings. For locale-aware conversions
  use the equivalent QLocale methods.

* QDate, QTime, and QDateTime have undergone important behavioural changes:
  * QDate only implements the Gregorian calendar, the switch to the Julian
    calendar before 1582 has been removed. This means all QDate methods will
    return different results for dates prior to 15 October 1582, and there is
    no longer a gap between 4 October 1582 and 15 October 1582.
  * QDate::setYMD() is deprecated, use QDate::setDate() instead
  * Most methods now apply strict validity checks and will return appropriate
    and consistent values when invalid.  For example, QDate::year() will return
    0 and QDate::shortMonthName() will return QString().
  * Adding days to a null QDate or seconds to a null QTime will no longer return
    a valid QDate/QTime.
  * QDate stores the Julian Day as a qint64 extending date support across a
    more interesting range, see the class documentation for details.
    * Conversion to YMD form dates is only accurate between to 4800 BCE to
      1.4 million CE
    * The QDate::addDays() and QDateTime::addDays() methods now take a qint64
    * The QDate::daysTo() and QDateTime::daysTo() methods now return a qint64

* QTextCodec::codecForCStrings() and QTextCodec::setCodecForCStrings() have both
  been removed. This was removed due to issues with breaking other code from
  libraries, creating uncertainty/bugs in using QString easily, and (to a lesser
  extent) performance issues.

* QTextCodec::codecForTr() and QTextCodec::setCodecForTr() have been removed,
  QCoreApplication::Encoding value CodecForTr is now obsolete, use
  DefaultCodec instead. For reasoning, see the codecForCStrings() removal above.

* QIntValidator and QDoubleValidator no longer fall back to using the C locale if
  the requested locale fails to validate the input.

* A new set of classes for doing pattern matching with Perl-compatible regular
  expressions has been added: QRegularExpression, QRegularExpressionMatch and
  QRegularExpressionMatchIterator. They aim to replace QRegExp with a more
  powerful and flexible regular expression engine.

* QEvent::AccessibilityPrepare, AccessibilityHelp and AccessibilityDescription removed:
  * The enum values simply didn't make sense in the first place and should simply be dropped.

QtGui
-----
* Accessibility has been refactored. The hierachy of accessible objects is implemented via
  proper parent/child functions instead of using navigate which has been deprecated for this purpose.
  Table and cell interfaces have been added to qaccessible2.h

* Touch events and points have been extended to hold additional
  information like capability flags, point-specific flags, velocity,
  and raw positions.

QtWidgets
---------
* QInputContext removed as well as related getters and setters on QWidget and QApplication.
  Input contexts are now platform specific.

* QInputDialog::getInteger() has been obsoleted. Use QInputDialog::getInt() instead.

* In Qt 4, many QStyleOption subclasses were introduced in order to keep
  binary compatibility -- QStyleOption was designed to be extended this way,
  in fact it embeds a version number. In Qt 5 the various QStyleOption*V{2,3,4}
  classes have been removed, and their members merged into the respective
  base classes. Those classes were left as typedefs to keep existing code
  working. Still, some minor adjustements could be necessary, especially in code
  that uses QStyleOption directly and does not initialize all the members using
  the proper Qt API: due to the version bump, QStyle will try to use the additional
  QStyleOption members, which are left default-initialized.

* QHeaderView - The following functions have been obsoleted.

  * void setMovable(bool movable) - use void setSectionsMovable(bool movable) instead.

  * bool isMovable() const - use bool sectionsMovable() const instead.

  * void setClickable(bool clickable) - use void setSectionsClickable(bool clickable) instead.

  * bool isClickable() const - use bool sectionsClickable() instead.

  * void setResizeMode(int logicalindex, ResizeMode mode) -
    use setSectionResizeMode(logicalindex, mode) instead.

  * ResizeMode resizeMode(int logicalindex) const -
    use sectionResizeMode(int logicalindex) instead.

QtNetwork
---------
* QHostAddress::isLoopback() API added. Returns true if the address is
  one of the IP loopback addresses.

* QSslCertificate::serialNumber() now always returns the serial number in
  hexadecimal format.

* The openssl network backend now reads the ssl configuration file allowing
  the use of openssl engines.


QtOpenGL
--------

QtScript
--------


QTestLib
--------
* [QTBUG-20615] Autotests can now log test output to multiple destinations
  and log formats simultaneously.

QtSql
-----
QSqlTableModel/QSqlRelationalTableModel

* The dataChanged() signal is now emitted for changes made to an inserted
record that has not yet been committed. Previously, dataChanged() was
suppressed in this case for OnRowChange and OnFieldChange. This was probably
an attempt to avoid trouble if setData() was called while handling
primeInsert(). By emitting dataChanged(), we ensure that all views are aware
of the change.

* While handling primeInsert() signal, the record must be manipulated using
the provided reference. Do not attempt to manipulate the records using the
model methods setData() or setRecord().

* removeRows() no longer emits extra beforeDelete signal for out of range row.

* removeRows() now requires the whole range of targetted rows to be valid
before doing anything. Previously, it would remove what it could and
ignore the rest of the range.

* setRecord() and insertRecord()
  -Only use fields where generated flag is set to true. This is
  is consistent with the meaning of the flag.
  -Require all fields to map correctly. Previously fields that didn't
  map were simply ignored.
  -For OnManualSubmit, insertRecord() no longer leaves behind an empty
  row if setRecord() fails.
  -setRecord() now automatically submits for OnRowChange.

* QSqlQueryModel::indexInQuery() is now virtual. See
QSqlTableModel::indexInQuery() as example of how to implement in a
subclass.

* QSqlTableModel::selectRow(): This is a new method that refreshes a single
row in the model from the database.

* QSqlTableModel edit strategies OnFieldChange/OnRowChange QTBUG-2875
Previously, after changes were submitted in these edit strategies, select()
was called which removed and inserted all rows. This ruined navigation
in QTableView. Now, with these edit strategies, there is no implicit select()
done after committing. This includes deleted rows which remain in
the model as blank rows until the application calls select(). Instead,
selectRow() is called to refresh only the affected row.

* QSqlTableModel::isDirty(): New overloaded method to check whether model
has any changes to submit. QTBUG-3108

* QSqlTableModel::setData() and setRecord() no longer revert pending changes
that fail upon resubmitting for edit strategies OnFieldChange and OnRowChange.
Instead, pending (failed) changes cause new changes inappropriate to the
edit strategy to be refused. The application should resolve or revert pending
changes. insertRows() and insertRecord() also respect the edit strategy.

****************************************************************************
*                          Database Drivers                                *
****************************************************************************


****************************************************************************
*                      Platform Specific Changes                           *
****************************************************************************

Qt for Linux/X11
----------------


Qt for Windows
--------------
* Accessibility framework uses IAccessible2


Qt for Mac OS X
---------------


Qt for Embedded Linux
---------------------


Qt for Windows CE
-----------------


****************************************************************************
*                      Compiler Specific Changes                           *
****************************************************************************


****************************************************************************
*                          Tools                                           *
****************************************************************************

- Build System

  * Remove qttest_p4.prf file. From now on we should explicitly enable the
    things from it which we want. Autotest .pro files should stop using
    'load(qttest_p4)' and start using 'CONFIG+=testcase' instead.

- Assistant

- Designer
  * [QTBUG-8926] [QTBUG-20440] Properties of type QStringList now have
    translation attributes which apply to all items.
    They are by default translatable.

- Linguist

- rcc


- moc

* [QTBUG-20785] The moc now has a -b<file> option to #include an additional
  file at the beginning of the generated file.


- uic


- uic3


- qmake

* QMAKE_MOC_OPTIONS variable is now available for passing additional parameters
  to the moc.


- configure


- qtconfig


****************************************************************************
*                          Plugins                                         *
****************************************************************************
- The text codecs that were previously plugins are now built into QtCore.

****************************************************************************
*                   Important Behavior Changes                             *
****************************************************************************

- QPointer

   * QPointer itself is now deprecated, and the implementation of QPointer
     has been changed to use QWeakPointer. The old guard mechanism has been
     removed. This causes two slight changes in behavior when using
     QPointer:

     * When using QPointer on a QWidget (or a subclass of QWidget), previously
     the QPointer would be cleared by the QWidget destructor. Now, the QPointer
     is cleared by the QObject destructor (since this is when QWeakPointers are
     cleared). Any QPointers tracking a widget will NOT be cleared before the
     QWidget destructor destroys the children for the widget being tracked.

     * When constructing a QSharedPointer to take ownership of an object after a
     QPointer is already tracking the object. Previously, the shared pointer
     construction would not be affected by the QPointer, but now that QPointer
     is implemented using QWeakPoiner, constructing the QSharedPointer will
     cause an abort().


- QVariant

  * Definition of QVariant::UserType changed. Currently it is the same as
    QMetaType::User, which means that it points to the first registered custom
    type, instead of a nonexistent type.


- QMessageBox

     * The static function QMessageBox::question has changed the default argument
     for buttons. Before the default was to have an Ok button. That is changed
     to having a yes and a no button.