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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://doc.trolltech.com/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://www.qtsoftware.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 *
****************************************************************************
****************************************************************************
* Platform Specific Changes *
****************************************************************************
****************************************************************************
* Important Behavior Changes *
****************************************************************************
- The experimental Direct3D paint engine has been removed. The
reasons for this is that Qt Software focuses on OpenGL for desktop
hardware accelerated rendering.
- When mixing OpenGL and QPainter calls you need to first call syncState()
on the paint engine, for example "painter->paintEngine()->syncState()".
This is to ensure that the engine flushes any pending drawing and sets up
the GL modelview/projection matrices properly.
- 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).
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