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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">QWSScreenSaver Class Reference<br /><span class="small-subtitle">[<a href="qtgui.html">QtGui</a> module]</span>
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<p>The QWSScreenSaver class is a base class for screensavers in Qt for Embedded Linux. <a href="#details">More...</a></p>
<pre> #include <QWSScreenSaver></pre><ul>
<li><a href="qwsscreensaver-members.html">List of all members, including inherited members</a></li>
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<h2>Public Functions</h2>
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<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><b><a href="qwsscreensaver.html#dtor.QWSScreenSaver">~QWSScreenSaver</a></b> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><b><a href="qwsscreensaver.html#restore">restore</a></b> () = 0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><b><a href="qwsscreensaver.html#save">save</a></b> ( int <i>level</i> ) = 0</td></tr>
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<h2>Detailed Description</h2>
<p>The QWSScreenSaver class is a base class for screensavers in Qt for Embedded Linux.</p>
<p>When running <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> applications, it is the server application that installs and controls the screensaver. <a href="qt-embedded-linux.html">Qt for Embedded Linux</a> supports multilevel screen saving; i.e., it is possible to specify several different levels of screen responsiveness. For example, you can choose to first turn off the light before you fully activate the screensaver.</p>
<p>Note that there exists no default screensaver implementation.</p>
<p>To create a custom screensaver, derive from this class and reimplement the <a href="qwsscreensaver.html#restore">restore</a>() and <a href="qwsscreensaver.html#save">save</a>() functions. These functions are called whenever the screensaver is activated or deactivated, respectively. Once an instance of your custom screensaver is created, you can use the <a href="qwsserver.html#setScreenSaver">QWSServer::setScreenSaver</a>() function to install it.</p>
<p>See also <a href="qwsserver.html">QWSServer</a>, <a href="qscreen.html">QScreen</a>, and <a href="qt-embedded-linux.html">Qt for Embedded Linux</a>.</p>
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<h2>Member Function Documentation</h2>
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<h3 class="fn"><a name="dtor.QWSScreenSaver"></a>QWSScreenSaver::~QWSScreenSaver () <tt> [virtual]</tt></h3>
<p>Reimplement this function to destroy the screensaver.</p>
<a name="//apple_ref/cpp/instm/QWSScreenSaver/restore"></a>
<h3 class="fn"><a name="restore"></a>void QWSScreenSaver::restore () <tt> [pure virtual]</tt></h3>
<p>Implement this function to deactivate the screensaver, restoring the previously saved screen.</p>
<p>See also <a href="qwsscreensaver.html#save">save</a>() and <a href="qwsserver.html#screenSaverActivate">QWSServer::screenSaverActivate</a>().</p>
<a name="//apple_ref/cpp/instm/QWSScreenSaver/save"></a>
<h3 class="fn"><a name="save"></a>bool QWSScreenSaver::save ( int <i>level</i> ) <tt> [pure virtual]</tt></h3>
<p>Implement this function to activate the screensaver, saving the current screen.</p>
<p><a href="qt-embedded-linux.html">Qt for Embedded Linux</a> supports multilevel screen saving; i.e., it is possible to specify several different levels of screen responsiveness. For example, you can choose to first turn off the light before you fully activate the screensaver. Use the <a href="qwsserver.html#setScreenSaverIntervals">QWSServer::setScreenSaverIntervals</a>() to specify the time intervals between the different levels.</p>
<p>This function should return true if the screensaver successfully enters the given <i>level</i>; otherwise it should return false.</p>
<p>See also <a href="qwsscreensaver.html#restore">restore</a>() and <a href="qwsserver.html#screenSaverActivate">QWSServer::screenSaverActivate</a>().</p>
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