Qt Status on QNX

Qt Status on QNX Neutrino OS

Covering Qt5 only and so not mentioning "5", just "Qt".

Supported Modules

The following modules are currently known to work on the QNX Neutrino OS platform and are used for regular builds and unit testing. Please note that this list is under constant change (for now).

Qt essential modules	state	notes
Qt Core	supported
Qt Declarative	not supported
Qt GUI	supported
Qt Multimedia	supported	not supported on x86, a few known issues
Qt Multimedia Widgets	supported	not supported on x86, a few known issues; no platformstyle
Qt Network	supported
Qt QML	supported
Qt Quick	supported
Qt Quick Controls	supported	No platform style
Qt Quick Dialogs	supported	Some native styles only
Qt Quick Layouts	supported
Qt SQL	supported
Qt Test	supported
Qt WebKit QML	not supported	Depends on Qt Declarative
Qt WebKit Widgets	not supported	Compiles and runs, but is not officially supported in 5.4
Qt Widgets	supported	No platform style

Qt add ons	state	notes
Active Qt	not applicable
Enginio	not supported
Qt Android Extras	not applicable
Qt Bluetooth	not supported	no OS backed defined yet
Qt Concurrent	supported
Qt D-Bus	not applicable
Qt Graphical Effects	supported
Qt Image Formats	supported
Qt Mac Extras	not applicable
Qt NFC	not supported	no OS backed defined yet
Qt OpenGL		Only OpenGL ES 2
Qt Positioning	not supported	no OS backed defined yet
Qt Print Support	supported	only printing to pdf
Qt Quick1	not supported	might work
Qt Script	supported
Qt Tools	supported
Qt Sensors	not supported	no OS backed defined yet
Qt Serial Port	not supported	a backend is available; a candidate for a future release
Qt SVG	supported
Qt WebSockets	not supported
Qt Windows Extras	not applicable
Qt X11 Extras	not applicable
Qt XML	supported
Qt XML Patterns	partly supported	XPath functionality supported, XML schema validation not supported

"supported" modules are provided in the binary Qt installers for QNX.

Key development works and fixes related to the Qt on the QNX platforms

Tentative plan for Qt 5.4

• A more broad support of Bluetooth (all platforms)
• An experimental support for DBus
• Improvements in QtMultimedia
• Extensions and integration with new QNX platform releases

In Qt 5.3.0

QPA for QNX

• Improved focus handling
  • Properly honor "libscreen" keyboard focus
  • Platform windows can now be activated (receive keyboard focus) by the application
  • Fixed bugs related to libscreen focus handling
• Fixed timing issues when creating EGL surfaces
• Refactoring (screen error handling, remove dead code, etc.)
• Populate touch event properties
• Fixed resizing windows (buffers are destroyed and re-created)
• Creation of parent-less windows
• Fixed window re-parenting, positioning and opacity

QtBase

• Added support for the SPDY protocol (version 3.0) (all platforms)
• Added support for the Next Protocol Negotiation (NPN) TLS extension (all platforms)
• Fixed ComboBoxes and Popup dialogs (QNX and BlackBerry 10)
• Fix application font removal when using Fontconfig (all platforms)
• Fixed evaluation of font width for selected FreeType fonts (all platforms)
• Fixed dlclose "Shared objects still referenced" error (QNX and BlackBerry 10)

QtMultimedia

• Performance improvements for video playback (QNX and BlackBerry 10)
• Fix re-play of media. mm-renderer buffer status is now roperly evaluated. (QNX and BlackBerry 10)

QtDeclarative

• Fix stack order and focus when using QML Window API (all platforms)

QtLocation

• Switch tile server for OSM by MapQuest (all platforms)
• Prepare the QML Mapping API for the API freeze (all platforms)

Known issues

Qt 5.3.0

Fixed in Qt 5.3.1

• QQuickItem size will not follow window size [1]
• Qt Quick Controls FileDialog crashes [2] and which perceived by the user as not appearing on the screen.
• QDir might report directories twice [3] on some folders
• QFileSystemWatcher::addPath doesn't handle adding a path more than once correctly [4]
• Instead of slog2info, Qt debugging and logging output can be forced to go to stderr if the QT_LOGGING_TO_CONSOLE environment variable has been set [5]

Other issues and aspects affecting the use of Qt on QNX

• Qt Quick animations are running slower than expected if the actual frame rate is less than 60fps on a give target. If an application can not maintain a constant frame rate of 60fps the QSG_FIXED_ANIMATION_STEP environment variable should be set to "no" to improve the animation speed.
• Fontconfig is not available in the QNX SDP 6.6 release. Qt compiled for QNX SDP 6.6 falls back to the internal font database. You need to set QT_QPA_FONTDIR pointing to the location of Qt fonts on target (typically in the ./lib/fonts)
• QNX SDK for Apps and Media 1.0 does not provide Fontconfig for the x86 target. Qt compiled for this target falls back to the internal font database. See the previous point for a workaround. A patch from QNX is in the work to resolve this issue and will be published on http://qnx.com
• Even though cmake files for Qt are provided in a Qt build for QNX Neutrino OS by default, their use is not supported, since QNX SDP 6.6 does not supply a toolchain file for cmake. It is still possible to provide a custom toolchain file and use cmake with Qt on QNX. * On-screen virtual keyboard is not provided by QNX SDP 6.6, nor by the QNX SDK for Apps and Media 1.0. An external hardware keyboard should be used or an own virtual keyboard implementation has to be configured.
• Qt widgets and Qt Quick controls use the default style when started on a QNX target. This style is a very basic implementation with a very limited visual appearance. A complete style should be implemented to follow all look-n-feel requirements of a specific project.
• QClipboard is currently not supported
• QCursor is currently not not fully supported due to limitations in the QNX Screen Graphics Subsystem

Qt 5.2.x and earlier

See the list of know issues for BlackBerry 10 for now. Most of them are applicable. More details will be provided by time of the Qt 5.3.0 final release.

Where and how report issues

Please use the the QtPorts: QNX component for QNX specific issues and other components for Qt generic issues even if you found them on QNX Neutrino OS.