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Qt 4.6 introduces many new features and improvements as well as bugfixes
over the 4.5.x series. For more details, refer to the online documentation
included in this distribution. The documentation is also available online:
http://qt.nokia.com/doc/4.6
The Qt version 4.6 series is binary compatible with the 4.5.x series.
Applications compiled for 4.5 will continue to run with 4.6.
Some of the changes listed in this file include issue tracking numbers
corresponding to tasks in the Task Tracker:
http://qt.nokia.com/developer/task-tracker
Each of these identifiers can be entered in the task tracker to obtain more
information about a particular change.
****************************************************************************
* General *
****************************************************************************
****************************************************************************
* Library *
****************************************************************************
* [245219] Added QXmlQuery::setFocus(const QString &focus);
- QVariant
* Many optimisations
* Added QVariant::toFloat() and QVariant::toReal()
* Added QVariant(float) constructor
****************************************************************************
* Platform Specific Changes *
****************************************************************************
- Significant external contribution from Milan Burda for planned removal
of (non-unicode) Windows 9x/ME support.
- QRegion is no longer a GDI object by default. This means it is no
longer subject to gui-thread only nor does it potentially impact
the 10.000 GDI object limit per process. By explicitly calling
.handle() a GDI object will be created and memory managed by
QRegion. The native handle is for reading out only. Any GDI calls
made on the HRGN handle will not affect the QRegion.
****************************************************************************
* Important Behavior Changes *
****************************************************************************
- The experimental Direct3D paint engine has been removed. The reason for
this is that Nokia focuses on OpenGL for desktop hardware accelerated
rendering.
- The default engine used to draw onto OpenGL buffers has changed in
Qt 4.6. The QPaintEngine::OpenGL2 engine is now used as the default
engine. This *may* cause compatibility problems for applications
that use a mix of QPainter and native OpenGL calls to draw into a GL
buffer. Use the QGL::setPreferredPaintEngine() function to enforce
usage of the old GL paint engine.
- When mixing OpenGL and QPainter calls you need to surround your
custom OpenGL calls with QPainter::beginNativePainting() and
QPainter::endNativePainting().
This is to ensure that the paint engine flushes any pending drawing and sets
up the GL modelview/projection matrices properly before you can issue custom
OpenGL calls, and to let the paint engine synchronize to the painter state
before resuming regular QPainter based drawing.
- Graphics View has undergone heavy optimization work, and as a result of
this work, the following behavior changes were introduced.
a) QStyleOptionGraphicsItem::exposedRect now contains the item's bounding
rectangle, and QStyleOptionGraphicsItem::matrix is uninitialized by
default. You can enable an exact exposed rectangle and a correct matrix
by enabling the flag QGraphicsItem::ItemUsesExtendedStyleOptions.
b) QStyleOptionGraphicsItem::levelOfDetails is obsoleted and its value is
always initialized to 1. Instead you can call
QStyleOptionGraphicsItem::levelOfDetailFromTransform(const QTransform &)
to determine the level of detail.
c) QGraphicsView no longer calls QGraphicsView::drawItems(), and in turn
QGraphicsScene::drawItems(), by default. You can get the old behavior
back by enabling QGraphicsView::IndirectPainting.
d) QGraphicsItem no longer calls itemChange() for position and
transformation changes. If you want to receive notifications for changes
to the item's position and transformation, you can set the flag
QGraphicsItem::ItemSendsGeometryChanges (which is enabled by default by
QGraphicsWidget and QGraphicsProxyWidget).
- QDesktopWidget on X11 no longer emits the resized(int) signal when screens
are added or removed. This was not done on other platforms. Use the
screenCountChanged signal instead
- QUrl's parser is more strict when for hostnames in URLs. QUrl now
enforces STD 3 rules:
* each individual hostname section (between dots) must be at most
63 ASCII characters in length;
* only letters, digits, and the hyphen character are allowed in the
ASCII range; letters outside the ASCII range follow the normal
IDN rules
That means QUrl no longer accepts some URLs that were invalid
before, but weren't interpreted as such.
- The Unix configure-time check for STL is stricter now in Qt
4.6.0. This means some legacy STL implementations may fail to pass
the test and, therefore, Qt will automatically disable STL support.
This is a binary-compatible change: existing code will continue to
work without being recompiled. However, it affects the source code,
since some STL-compatibility API will not be enabled.
Platforms affected by this change:
* solaris-cc-* with the default (Cstd) C++ STL library
recommendation: use -library=stlport4
See Sun Studio's documentation for the effects of this option
- QVariant has now a new implicit constructor that takes a float. This
means that code that assigned a float to a variant would create a
variant with userType QMetaType::Float, instead of QVariant::Double.
- QDataStream will now read and write all floating point numbers with the
same precision, regardless of whether it's streamed into or out from a
float or double. This is to maintain compatibility across platforms with
a different default precision for qreal. The default is 64-bit precision
for all floating point numbers, and this can be changed using the new
function setFloatingPointPrecision(). Set Qt_4_5 as the version of the
QDataStream to get the behavior of previous versions.
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