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<td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">Qt for Embedded Linux Environment Variables<br /><span class="subtitle"></span>
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<p>These environment variables are relevant to <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> users.</p>
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<thead><tr valign="top" class="qt-style"><th>Variable</th><th>Description</th></tr></thead>
<tr valign="top" class="odd"><td><b>POINTERCAL_FILE</b> <a name="pointercal-file"></a></td><td>Specifies the file containing the data used to calibrate the pointer device.<p>See also <a href="qwscalibratedmousehandler.html">QWSCalibratedMouseHandler</a> and <a href="qt-embedded-pointer.html">Qt for Embedded Linux Pointer Handling</a>.</p>
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<tr valign="top" class="even"><td><b>QT_ONSCREEN_PAINT</b> <a name="qt-onscreen-paint"></a></td><td>If defined, the application will render its widgets directly on screen. The affected regions of the screen will not be modified by the screen driver unless another window with a higher focus requests (parts of) the same region.<p>Setting this environment variable is equivalent to setting the <a href="qt.html#WidgetAttribute-enum">Qt::WA_PaintOnScreen</a> attribute for all the widgets in the application.</p>
<p>See also the Qt for Embedded Linux <a href="qt-embedded-architecture.html#graphics-rendering">graphics rendering</a> documentation.</p>
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<tr valign="top" class="odd"><td><b>QWS_SW_CURSOR</b> <a name="qws-sw-cursor"></a></td><td>If defined, the software mouse cursor is always used (even when using an accelerated driver that supports a hardware cursor).</td></tr>
<tr valign="top" class="even"><td><b>QWS_DISPLAY</b> <a name="qws-display"></a></td><td>Specifies the display type and framebuffer. For example, if the current shell is bash, ksh, zsh or sh:<pre> export QWS_DISPLAY=<driver>[:<driver specific options>]...
[:<display num>]</pre>
<p>The valid values for the <tt><driver></tt> argument are <tt>LinuxFb</tt>, <tt>QVFb</tt>, <tt>VNC</tt>, <tt>Transformed</tt>, <tt>Multi</tt> and <a href="qscreendriverplugin.html#keys">keys</a> identifying custom drivers, and the <tt><display num></tt> argument is used to separate screens that are using the same screen driver and to enable multiple displays (see the <a href="qt-embedded-running.html">Running Qt for Embedded Linux Applications</a> documentation for more details).</p>
<p>The driver specific options are described in the <a href="qt-embedded-displaymanagement.html">display management</a> documentation.</p>
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<tr valign="top" class="odd"><td><b>QWS_SIZE</b> <a name="qws-size"></a></td><td>Specifies the size of the <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> window which is centered within the screen. For example, if the current shell is bash, ksh, zsh or sh:<pre> export QWS_SIZE=<width>x<height></pre>
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<tr valign="top" class="even"><td><b>QWS_MOUSE_PROTO</b> <a name="qws-mouse-proto"></a></td><td>Specifies the driver for pointer handling. For example, if the current shell is bash, ksh, zsh or sh:<pre> export QWS_MOUSE_PROTO=<driver>[:<driver specific options>]</pre>
<p>The valid values for the <tt><driver></tt> argument are <tt>MouseMan</tt>, <tt>IntelliMouse</tt>, <tt>Microsoft</tt>, <tt>VR41xx</tt>, <tt>LinuxTP</tt>, <tt>Yopy</tt>. <tt>Tslib</tt> and <a href="qmousedriverplugin.html#keys">keys</a> identifying custom drivers, and the driver specific options are typically a device, e.g., <tt>/dev/mouse</tt> for mouse devices and <tt>/dev/ts</tt> for touch panels.</p>
<p>Multiple keyboard drivers can be specified in one go:</p>
<pre> export QWS_MOUSE_PROTO="<driver>[:<driver specific options>]
<driver>[:<driver specific options>]
<driver>[:<driver specific options>]"</pre>
<p>Input will be read from all specified drivers. Note that the <tt>Vr41xx</tt> driver also accepts two optional arguments: <tt>press=<value></tt> defining a mouseclick (the default value is 750) and <tt>filter=<value></tt> specifying the length of the filter used to eliminate noise (the default length is 3). For example:</p>
<pre> export QWS_MOUSE_PROTO="Vr41xx:press=500:/dev/misc/ts"</pre>
<p>See also <a href="qt-embedded-pointer.html">Qt for Embedded Linux Pointer Handling</a>.</p>
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<tr valign="top" class="odd"><td><b>QWS_KEYBOARD</b> <a name="qws-keyboard"></a></td><td>Specifies the driver and device for character input. For example, if the current shell is bash, ksh, zsh or sh:<pre> export QWS_KEYBOARD=<driver>[:<driver specific options>]</pre>
<p>The valid values for the <tt><driver></tt> argument are <tt>SL5000</tt>, <tt>Yopy</tt>, <tt>VR41xx</tt>, <tt>TTY</tt>, <tt>USB</tt> and <a href="qkbddriverplugin.html#keys">keys</a> identifying custom drivers, and the driver specific options are typically a device, e.g., <tt>/dev/tty0</tt>.</p>
<p>Multiple keyboard drivers can be specified in one go:</p>
<pre> export QWS_KEYBOARD="<driver>[:<driver specific options>]
<driver>[:<driver specific options>]
<driver>[:<driver specific options>]"</pre>
<p>Input will be read from all specified drivers.</p>
<p>See also <a href="qt-embedded-charinput.html">Qt for Embedded Linux Character Input</a>.</p>
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