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<h1 class="title">QWSMouseHandler Class Reference</h1>
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<!-- $$$QWSMouseHandler-brief -->
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<p>The QWSMouseHandler class is a base class for mouse drivers in Qt for Embedded Linux. <a href="#details">More...</a></p>
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<!-- @@@QWSMouseHandler -->
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<pre class="cpp"> <span class="preprocessor">#include <QWSMouseHandler></span></pre><p><b>Inherited by: </b><a href="qwscalibratedmousehandler.html">QWSCalibratedMouseHandler</a>.</p>
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<a name="public-functions"></a>
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<h2>Public Functions</h2>
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<table class="alignedsummary">
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#QWSMouseHandler">QWSMouseHandler</a></b> ( const QString & <i>driver</i> = QString(), const QString & <i>device</i> = QString() )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#dtor.QWSMouseHandler">~QWSMouseHandler</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#calibrate">calibrate</a></b> ( const QWSPointerCalibrationData * <i>data</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#clearCalibration">clearCalibration</a></b> ()</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#getCalibration">getCalibration</a></b> ( QWSPointerCalibrationData * <i>data</i> ) const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#limitToScreen">limitToScreen</a></b> ( QPoint & <i>position</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#mouseChanged">mouseChanged</a></b> ( const QPoint & <i>position</i>, int <i>state</i>, int <i>wheel</i> = 0 )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> const QPoint & </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#pos">pos</a></b> () const</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#resume">resume</a></b> () = 0</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#setScreen">setScreen</a></b> ( const QScreen * <i>screen</i> )</td></tr>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qwsmousehandler.html#suspend">suspend</a></b> () = 0</td></tr>
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</table>
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<a name="details"></a>
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<!-- $$$QWSMouseHandler-description -->
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<div class="descr">
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<h2>Detailed Description</h2>
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<p>The QWSMouseHandler class is a base class for mouse drivers in Qt for Embedded Linux.</p>
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<p>Note that this class is only available in <a href="qt-embedded-linux.html">Qt for Embedded Linux</a>.</p>
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<p><a href="qt-embedded-linux.html">Qt for Embedded Linux</a> provides ready-made drivers for several mouse protocols, see the <a href="qt-embedded-pointer.html">pointer handling</a> documentation for details. Custom mouse drivers can be implemented by subclassing the QWSMouseHandler class and creating a mouse driver plugin (derived from <a href="qmousedriverplugin.html">QMouseDriverPlugin</a>). The default implementation of the <a href="qmousedriverfactory.html">QMouseDriverFactory</a> class will automatically detect the plugin, and load the driver into the server application at run-time using Qt's <a href="plugins-howto.html">plugin system</a>.</p>
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<p>The mouse driver receives mouse events from the system device and encapsulates each event with an instance of the <a href="qwsevent.html">QWSEvent</a> class which it then passes to the server application (the server is responsible for propagating the event to the appropriate client). To receive mouse events, a QWSMouseHandler object will usually create a <a href="qsocketnotifier.html">QSocketNotifier</a> object for the given device. The <a href="qsocketnotifier.html">QSocketNotifier</a> class provides support for monitoring activity on a file descriptor. When the socket notifier receives data, it will call the mouse driver's <a href="qwsmousehandler.html#mouseChanged">mouseChanged</a>() function to send the event to the <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> server application for relaying to clients.</p>
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<p>If you are creating a driver for a device that needs calibration or noise reduction, such as a touchscreen, use the <a href="qwscalibratedmousehandler.html">QWSCalibratedMouseHandler</a> subclass instead to take advantage of the <a href="qwsmousehandler.html#calibrate">calibrate</a>() and <a href="qwsmousehandler.html#clearCalibration">clearCalibration</a>() functions. The <a href="qws-mousecalibration.html">Mouse Calibration</a> demonstrates how to write a simple program using the mechanisms provided by the QWSMouseHandler class to calibrate a mouse driver.</p>
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<p>Note that when deriving from the QWSMouseHandler class, the <a href="qwsmousehandler.html#resume">resume</a>() and <a href="qwsmousehandler.html#suspend">suspend</a>() functions must be reimplemented to control the flow of mouse input, i.e., the default implementation does nothing. Reimplementations of these functions typically call the <a href="qsocketnotifier.html#setEnabled">QSocketNotifier::setEnabled</a>() function to enable or disable the socket notifier, respectively.</p>
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<p>In addition, QWSMouseHandler provides the <a href="qwsmousehandler.html#setScreen">setScreen</a>() function that allows you to specify a screen for your mouse driver and the <a href="qwsmousehandler.html#limitToScreen">limitToScreen</a>() function that ensures that a given position is within this screen's boundaries (changing the position if necessary). Finally, QWSMouseHandler provides the <a href="qwsmousehandler.html#pos">pos</a>() function returning the current mouse position.</p>
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</div>
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<p><b>See also </b><a href="qmousedriverplugin.html">QMouseDriverPlugin</a>, <a href="qmousedriverfactory.html">QMouseDriverFactory</a>, and <a href="qt-embedded-pointer.html">Qt for Embedded Linux Pointer Handling</a>.</p>
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<!-- @@@QWSMouseHandler -->
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<div class="func">
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<h2>Member Function Documentation</h2>
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<!-- $$$QWSMouseHandler[overload1]$$$QWSMouseHandlerconstQString&constQString& -->
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<h3 class="fn"><a name="QWSMouseHandler"></a>QWSMouseHandler::<span class="name">QWSMouseHandler</span> ( const <span class="type"><a href="qstring.html">QString</a></span> & <i>driver</i> = QString(), const <span class="type"><a href="qstring.html">QString</a></span> & <i>device</i> = QString() )</h3>
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<p>Constructs a mouse driver. The <i>driver</i> and <i>device</i> arguments are passed by the <a href="qt-embedded-envvars.html#qws-mouse-proto">QWS_MOUSE_PROTO</a> environment variable.</p>
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<p>Call the <a href="qwsserver.html#setMouseHandler">QWSServer::setMouseHandler</a>() function to make the newly created mouse driver, the primary driver. Note that the primary driver is controlled by the system, i.e., the system will delete it upon exit.</p>
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<!-- @@@QWSMouseHandler -->
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<!-- $$$~QWSMouseHandler[overload1]$$$~QWSMouseHandler -->
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<h3 class="fn"><a name="dtor.QWSMouseHandler"></a>QWSMouseHandler::<span class="name">~QWSMouseHandler</span> ()<tt> [virtual]</tt></h3>
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<p>Destroys this mouse driver.</p>
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<p>Do not call this function if this driver is the primary mouse driver, i.e., if <a href="qwsserver.html#setMouseHandler">QWSServer::setMouseHandler</a>() function has been called passing this driver as argument. The primary mouse driver is deleted by the system.</p>
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<!-- @@@~QWSMouseHandler -->
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<!-- $$$calibrate[overload1]$$$calibrateconstQWSPointerCalibrationData* -->
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<h3 class="fn"><a name="calibrate"></a><span class="type">void</span> QWSMouseHandler::<span class="name">calibrate</span> ( const <span class="type"><a href="qwspointercalibrationdata.html">QWSPointerCalibrationData</a></span> * <i>data</i> )<tt> [virtual]</tt></h3>
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<p>This virtual function allows subclasses of <a href="qwsmousehandler.html">QWSMouseHandler</a> to set the calibration information passed in the given <i>data</i>. Note that the default implementation does nothing.</p>
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<p><b>See also </b><a href="qwscalibratedmousehandler.html#calibrate">QWSCalibratedMouseHandler::calibrate</a>() and <a href="qwsmousehandler.html#clearCalibration">clearCalibration</a>().</p>
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<!-- @@@calibrate -->
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<!-- $$$clearCalibration[overload1]$$$clearCalibration -->
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<h3 class="fn"><a name="clearCalibration"></a><span class="type">void</span> QWSMouseHandler::<span class="name">clearCalibration</span> ()<tt> [virtual]</tt></h3>
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<p>This virtual function allows subclasses of <a href="qwsmousehandler.html">QWSMouseHandler</a> to clear the calibration information. Note that the default implementation does nothing.</p>
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<p><b>See also </b><a href="qwscalibratedmousehandler.html#clearCalibration">QWSCalibratedMouseHandler::clearCalibration</a>() and <a href="qwsmousehandler.html#calibrate">calibrate</a>().</p>
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<!-- @@@clearCalibration -->
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<!-- $$$getCalibration[overload1]$$$getCalibrationQWSPointerCalibrationData* -->
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<h3 class="fn"><a name="getCalibration"></a><span class="type">void</span> QWSMouseHandler::<span class="name">getCalibration</span> ( <span class="type"><a href="qwspointercalibrationdata.html">QWSPointerCalibrationData</a></span> * <i>data</i> ) const<tt> [virtual]</tt></h3>
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<p>This virtual function allows subclasses of <a href="qwsmousehandler.html">QWSMouseHandler</a> to fill in the device coordinates in <i>data</i> with values that correspond to screen coordinates that are already in <i>data</i>. Note that the default implementation does nothing.</p>
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<!-- @@@getCalibration -->
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<!-- $$$limitToScreen[overload1]$$$limitToScreenQPoint& -->
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<h3 class="fn"><a name="limitToScreen"></a><span class="type">void</span> QWSMouseHandler::<span class="name">limitToScreen</span> ( <span class="type"><a href="qpoint.html">QPoint</a></span> & <i>position</i> )</h3>
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<p>Ensures that the given <i>position</i> is within the screen's boundaries, changing the <i>position</i> if necessary.</p>
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<p><b>See also </b><a href="qwsmousehandler.html#pos">pos</a>() and <a href="qwsmousehandler.html#setScreen">setScreen</a>().</p>
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<!-- @@@limitToScreen -->
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<!-- $$$mouseChanged[overload1]$$$mouseChangedconstQPoint&intint -->
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<h3 class="fn"><a name="mouseChanged"></a><span class="type">void</span> QWSMouseHandler::<span class="name">mouseChanged</span> ( const <span class="type"><a href="qpoint.html">QPoint</a></span> & <i>position</i>, <span class="type">int</span> <i>state</i>, <span class="type">int</span> <i>wheel</i> = 0 )</h3>
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<p>Notifies the system of a new mouse event.</p>
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<p>This function updates the current mouse position and sends the event to the <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> server application for delivery to the correct widget. Note that a custom mouse driver must call this function whenever it wants to deliver a new mouse event.</p>
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<p>The given <i>position</i> is the global position of the mouse cursor. The <i>state</i> parameter is a bitmask of the <a href="qt.html#MouseButton-enum">Qt::MouseButton</a> enum's values, indicating which mouse buttons are pressed. The <i>wheel</i> parameter is the delta value of the mouse wheel as returned by <a href="qwheelevent.html#delta">QWheelEvent::delta</a>().</p>
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<p><b>See also </b><a href="qwsmousehandler.html#pos">pos</a>().</p>
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<!-- @@@mouseChanged -->
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<!-- $$$pos[overload1]$$$pos -->
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<h3 class="fn"><a name="pos"></a>const <span class="type"><a href="qpoint.html">QPoint</a></span> & QWSMouseHandler::<span class="name">pos</span> () const</h3>
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<p>Returns the current mouse position.</p>
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<p><b>See also </b><a href="qwsmousehandler.html#mouseChanged">mouseChanged</a>() and <a href="qwsmousehandler.html#limitToScreen">limitToScreen</a>().</p>
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<!-- @@@pos -->
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<!-- $$$resume[overload1]$$$resume -->
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<h3 class="fn"><a name="resume"></a><span class="type">void</span> QWSMouseHandler::<span class="name">resume</span> ()<tt> [pure virtual]</tt></h3>
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<p>Implement this function to resume reading and handling mouse events, e.g., call the <a href="qsocketnotifier.html#setEnabled">QSocketNotifier::setEnabled</a>() function to enable the socket notifier.</p>
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<p><b>See also </b><a href="qwsmousehandler.html#suspend">suspend</a>().</p>
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<!-- @@@resume -->
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<!-- $$$setScreen[overload1]$$$setScreenconstQScreen* -->
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<h3 class="fn"><a name="setScreen"></a><span class="type">void</span> QWSMouseHandler::<span class="name">setScreen</span> ( const <span class="type"><a href="qscreen.html">QScreen</a></span> * <i>screen</i> )</h3>
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<p>Sets the screen for this mouse driver to be the given <i>screen</i>.</p>
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<p>This function was introduced in Qt 4.2.</p>
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<p><b>See also </b><a href="qwsmousehandler.html#limitToScreen">limitToScreen</a>().</p>
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<!-- @@@setScreen -->
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<!-- $$$suspend[overload1]$$$suspend -->
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<h3 class="fn"><a name="suspend"></a><span class="type">void</span> QWSMouseHandler::<span class="name">suspend</span> ()<tt> [pure virtual]</tt></h3>
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<p>Implement this function to suspend reading and handling of mouse events, e.g., call the <a href="qsocketnotifier.html#setEnabled">QSocketNotifier::setEnabled</a>() function to disable the socket notifier.</p>
|
|
<p><b>See also </b><a href="qwsmousehandler.html#resume">resume</a>().</p>
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<!-- @@@suspend -->
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