Qt for Embedded Linux Environment Variables

Setting this environment variable is equivalent to setting the Qt::WA_PaintOnScreen attribute for all the widgets in the application.

See also the Qt for Embedded Linux graphics rendering documentation.

 export QWS_DISPLAY=<driver>[:<driver specific options>]...
         [:<display num>]

The valid values for the <driver> argument are LinuxFb, QVFb, VNC, Transformed, Multi and keys identifying custom drivers, and the <display num> argument is used to separate screens that are using the same screen driver and to enable multiple displays (see the Running Qt for Embedded Linux Applications documentation for more details).

The driver specific options are described in the display management documentation.

 export QWS_MOUSE_PROTO=<driver>[:<driver specific options>]

The valid values for the <driver> argument are MouseMan, IntelliMouse, Microsoft, VR41xx, LinuxTP, Yopy. Tslib and keys identifying custom drivers, and the driver specific options are typically a device, e.g., /dev/mouse for mouse devices and /dev/ts for touch panels.

Multiple keyboard drivers can be specified in one go:

 export QWS_MOUSE_PROTO="<driver>[:<driver specific options>]
         <driver>[:<driver specific options>]
         <driver>[:<driver specific options>]"

Input will be read from all specified drivers. Note that the Vr41xx driver also accepts two optional arguments: press=<value> defining a mouseclick (the default value is 750) and filter=<value> specifying the length of the filter used to eliminate noise (the default length is 3). For example:

 export QWS_MOUSE_PROTO="Vr41xx:press=500:/dev/misc/ts"

See also Qt for Embedded Linux Pointer Handling.