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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#mcevibrator-class-definition">MceVibrator Class Definition</a></li>
<li class="level1"><a href="#mcevibrator-class-implementation">MceVibrator Class Implementation</a></li>
<li class="level1"><a href="#buttonwidget-class-definition">ButtonWidget Class Definition</a></li>
<li class="level1"><a href="#buttonwidget-class-implementation">ButtonWidget Class Implementation</a></li>
<li class="level1"><a href="#function"><tt>main()</tt> Function</a></li>
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<h1 class="title">Maemo Vibration Example</h1>
<span class="subtitle"></span>
<!-- $$$widgets/maemovibration-description -->
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<p>Files:</p>
<ul>
<li><a href="widgets-maemovibration-buttonwidget-cpp.html">widgets/maemovibration/buttonwidget.cpp</a></li>
<li><a href="widgets-maemovibration-buttonwidget-h.html">widgets/maemovibration/buttonwidget.h</a></li>
<li><a href="widgets-maemovibration-mcevibrator-cpp.html">widgets/maemovibration/mcevibrator.cpp</a></li>
<li><a href="widgets-maemovibration-mcevibrator-h.html">widgets/maemovibration/mcevibrator.h</a></li>
<li><a href="widgets-maemovibration-main-cpp.html">widgets/maemovibration/main.cpp</a></li>
<li><a href="widgets-maemovibration-maemovibration-pro.html">widgets/maemovibration/maemovibration.pro</a></li>
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<p>The Maemo Vibration example shows how to tell the Maemo Mode Control Entity (MCE) to vibrate a maemo device.<p>The MCE is a system service on Maemo that, among other things, provides an D-Bus interface to trigger vibrations. The vibrations are specified as patterns and are defined in a system configuration file.</p>
<p>The example program reads the configuration file to look for possible vibration patterns and display a button for each. Pressing a button will make the device vibrate accordingly, until the application closes, or another pattern is started.</p>
<p class="centerAlign"><img src="images/maemovibration-example.png" alt="Screenshot of the Maemo Vibration Example" /></p><p>The code makes use of two classes:</p>
<ul>
<li><tt>MceVibrator</tt> connects to the MCE service and can start a certain vibrator pattern. It also is responsible to parse the configuration file.</li>
<li><tt>ButtonWidget</tt> provides a button for each pattern. Pressing the button activates the pattern in question.</li>
</ul>
<a name="mcevibrator-class-definition"></a>
<h2>MceVibrator Class Definition</h2>
<pre class="cpp"> <span class="keyword">class</span> MceVibrator : <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span>
{
Q_OBJECT
<span class="keyword">public</span>:
<span class="keyword">explicit</span> MceVibrator(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
<span class="operator">~</span>MceVibrator();
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> defaultMceFilePath<span class="operator">[</span><span class="operator">]</span>;
<span class="keyword">static</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> parsePatternNames(<span class="type"><a href="qtextstream.html">QTextStream</a></span> <span class="operator">&</span>stream);
<span class="keyword">public</span> <span class="keyword">slots</span>:
<span class="type">void</span> vibrate(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>patternName);
<span class="keyword">private</span>:
<span class="type">void</span> deactivate(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>patternName);
<span class="type"><a href="qdbusinterface.html">QDBusInterface</a></span> mceInterface;
<span class="type"><a href="qstring.html">QString</a></span> lastPatternName;
};</pre>
<p>The <tt>MceVibrator</tt> class inherits from <a href="qobject.html">QObject</a> and provides a specialized and Qt friendly interface to the MCE vibration facilty. The slot <tt>vibrate()</tt> can be called to make the device vibrate according to a specific pattern name. We will connect it to a signal of a <tt>ButtonWidget</tt> object later. The static method <tt>ParsePatternNames()</tt> can be called to find out which patterns are available to us.</p>
<ul>
<li><tt>mceInterface</tt> is our D-Bus handle to the MCE service. We use it to invoke methods on the MCE request object.</li>
<li><tt>lastPatternName</tt> contains the pattern that was activated last time. We have to keep track of this, because the last pattern has to be deactivated before activating a new pattern.</li>
</ul>
<a name="mcevibrator-class-implementation"></a>
<h2>MceVibrator Class Implementation</h2>
<p>To connect to the service, we initialize the D-Bus interface handle. The system header <tt>"mce/dbus-names.h"</tt> contains definitions of the D-Bus service name and request object path and interface. These are passed to the constructor of the handle, and Qt will automatically establish a connection to it, if it is possible.</p>
<p>The MCE expects us to first enable the vibrator before we can use it. This is done with the call to the <tt>MCE_ENABLE_VIBRATOR</tt> D-Bus method.</p>
<pre class="cpp"> MceVibrator<span class="operator">::</span>MceVibrator(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent) :
<span class="type"><a href="qobject.html">QObject</a></span>(parent)<span class="operator">,</span>
mceInterface(MCE_SERVICE<span class="operator">,</span> MCE_REQUEST_PATH<span class="operator">,</span> MCE_REQUEST_IF<span class="operator">,</span>
<span class="type"><a href="qdbusconnection.html">QDBusConnection</a></span><span class="operator">::</span>systemBus())
{
<span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> reply <span class="operator">=</span> mceInterface<span class="operator">.</span>call(MCE_ENABLE_VIBRATOR);
checkError(reply);
}</pre>
<p>From now on we can activate vibration patterns. Each time a vibration pattern is activated, the last pattern has to be deactivated first. In the vibrate slot we use the MCE interface to call the activation method.</p>
<pre class="cpp"> <span class="type">void</span> MceVibrator<span class="operator">::</span>vibrate(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>patternName)
{
deactivate(lastPatternName);
lastPatternName <span class="operator">=</span> patternName;
<span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> reply <span class="operator">=</span> mceInterface<span class="operator">.</span>call(MCE_ACTIVATE_VIBRATOR_PATTERN<span class="operator">,</span> patternName);
checkError(reply);
}</pre>
<p>The calls to the private method deactivate simply makes sure to deactivate the last pattern used, if there was one.</p>
<pre class="cpp"> <span class="type">void</span> MceVibrator<span class="operator">::</span>deactivate(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>patternName)
{
<span class="keyword">if</span> (<span class="operator">!</span>patternName<span class="operator">.</span>isNull()) {
<span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> reply <span class="operator">=</span> mceInterface<span class="operator">.</span>call(MCE_DEACTIVATE_VIBRATOR_PATTERN<span class="operator">,</span> patternName);
checkError(reply);
}
}</pre>
<p>Calling either the activate or deactivate MCE D-Bus method with invalid pattern names are ignored.</p>
<p>Finally, the destructor disables the vibrator. When the destructor of the MCE interface handle is called, the connection is also closed.</p>
<pre class="cpp"> MceVibrator<span class="operator">::</span><span class="operator">~</span>MceVibrator()
{
deactivate(lastPatternName);
<span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> reply <span class="operator">=</span> mceInterface<span class="operator">.</span>call(MCE_DISABLE_VIBRATOR);
checkError(reply);
}</pre>
<p>The MCE configuration file contains options for many different things. We are only interested in one line that contains the vibration patterns. It has the following format:</p>
<pre class="cpp"> VibratorPatterns<span class="operator">=</span>semicolon;separated;list;of;values</pre>
<p>The static method <tt>ParsePatternNames</tt> looks for this line and returns a <a href="qstringlist.html">QStringList</a> containing the values, which are the pattern names we can use.</p>
<pre class="cpp"> <span class="type"><a href="qstringlist.html">QStringList</a></span> MceVibrator<span class="operator">::</span>parsePatternNames(<span class="type"><a href="qtextstream.html">QTextStream</a></span> <span class="operator">&</span>stream)
{
<span class="type"><a href="qstringlist.html">QStringList</a></span> result;
<span class="type"><a href="qstring.html">QString</a></span> line;
<span class="keyword">do</span> {
line <span class="operator">=</span> stream<span class="operator">.</span>readLine();
<span class="keyword">if</span> (line<span class="operator">.</span>startsWith(QLatin1String(<span class="string">"VibratorPatterns="</span>))) {
<span class="type"><a href="qstring.html">QString</a></span> values <span class="operator">=</span> line<span class="operator">.</span>section(<span class="char">'='</span><span class="operator">,</span> <span class="number">1</span>);
result <span class="operator">=</span> values<span class="operator">.</span>split(<span class="char">';'</span>);
<span class="keyword">break</span>;
}
} <span class="keyword">while</span> (<span class="operator">!</span>line<span class="operator">.</span>isNull());
<span class="keyword">return</span> result;
}</pre>
<p>The helper function <tt>checkError()</tt> saves us some code duplication. None of the called methods return anything of use to us, so we're only interested in getting error messages for debugging.</p>
<pre class="cpp"> <span class="keyword">static</span> <span class="type">void</span> checkError(<span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span> <span class="operator">&</span>msg)
{
<span class="keyword">if</span> (msg<span class="operator">.</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qdbusmessage.html">QDBusMessage</a></span><span class="operator">::</span>ErrorMessage)
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> msg<span class="operator">.</span>errorName() <span class="operator"><</span><span class="operator"><</span> msg<span class="operator">.</span>errorMessage();
}</pre>
<a name="buttonwidget-class-definition"></a>
<h2>ButtonWidget Class Definition</h2>
<pre class="cpp"> <span class="keyword">class</span> ButtonWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
{
Q_OBJECT
<span class="keyword">public</span>:
ButtonWidget(<span class="type"><a href="qstringlist.html">QStringList</a></span> texts<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
<span class="keyword">signals</span>:
<span class="type">void</span> clicked(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>text);
<span class="keyword">private</span>:
<span class="type"><a href="qsignalmapper.html">QSignalMapper</a></span> <span class="operator">*</span>signalMapper;
};</pre>
<p>The <tt>ButtonWidget</tt> class inherits from <a href="qwidget.html">QWidget</a> and provides the main user interface for the application. It creates a grid of buttons, one for each string in the stringlist passed to the constructor. Pressing a button emits the <tt>clicked()</tt> signal, where the string is the text of the button that was pressed.</p>
<p>This class is taken from the <a href="qsignalmapper.html">QSignalMapper</a> documentation. The only change is the number of columns in the grid from three to two, to make the button labels fit.</p>
<a name="buttonwidget-class-implementation"></a>
<h2>ButtonWidget Class Implementation</h2>
<pre class="cpp"> ButtonWidget<span class="operator">::</span>ButtonWidget(<span class="type"><a href="qstringlist.html">QStringList</a></span> texts<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
signalMapper <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsignalmapper.html">QSignalMapper</a></span>(<span class="keyword">this</span>);
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>gridLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator"><</span> texts<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>button <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(texts<span class="operator">[</span>i<span class="operator">]</span>);
connect(button<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> signalMapper<span class="operator">,</span> SLOT(map()));
signalMapper<span class="operator">-</span><span class="operator">></span>setMapping(button<span class="operator">,</span> texts<span class="operator">[</span>i<span class="operator">]</span>);
gridLayout<span class="operator">-</span><span class="operator">></span>addWidget(button<span class="operator">,</span> i <span class="operator">/</span> <span class="number">2</span><span class="operator">,</span> i <span class="operator">%</span> <span class="number">2</span>);
}
connect(signalMapper<span class="operator">,</span> SIGNAL(mapped(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SIGNAL(clicked(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>)));
setLayout(gridLayout);
}</pre>
<a name="function"></a>
<h2><tt>main()</tt> Function</h2>
<p>The main function begins with looking up the patterns available to us.</p>
<pre class="cpp"> <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="type"><a href="qapplication.html">QApplication</a></span> a(argc<span class="operator">,</span> argv);
<span class="type"><a href="qstring.html">QString</a></span> path <span class="operator">=</span> MceVibrator<span class="operator">::</span>defaultMceFilePath;
<span class="type"><a href="qfile.html">QFile</a></span> file(path);
<span class="type"><a href="qstringlist.html">QStringList</a></span> names;
<span class="keyword">if</span> (file<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>Text)) {
<span class="type"><a href="qtextstream.html">QTextStream</a></span> stream(<span class="operator">&</span>file);
names <span class="operator">=</span> MceVibrator<span class="operator">::</span>parsePatternNames(stream);
file<span class="operator">.</span>close();
}
<span class="keyword">if</span> (names<span class="operator">.</span>isEmpty()){
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"Could not read vibration pattern names from "</span> <span class="operator"><</span><span class="operator"><</span> path;
a<span class="operator">.</span>exit(<span class="operator">-</span><span class="number">1</span>);
}</pre>
<p>Then we create one instance of both classes, and connects the <tt>ButtonWidget</tt>'s clicked signal to the <tt>MceVibrator</tt>'s <tt>vibrate()</tt> slot. This works, since the button texts are the same as the pattern names.</p>
<pre class="cpp"> ButtonWidget buttonWidget(names);
MceVibrator vibrator;
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(<span class="operator">&</span>buttonWidget<span class="operator">,</span> SIGNAL(clicked(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>))<span class="operator">,</span>
<span class="operator">&</span>vibrator<span class="operator">,</span> SLOT(vibrate(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>)));
buttonWidget<span class="operator">.</span>show();
<span class="keyword">return</span> a<span class="operator">.</span>exec();
}</pre>
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