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<h1 class="title">sensoritem.cpp Example File</h1>
<span class="subtitle">sensor_explorer/import/sensoritem.cpp</span>
<!-- $$$sensor_explorer/import/sensoritem.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "sensoritem.h"</span>
<span class="preprocessor">#include <QtCore/QDebug></span>
<span class="preprocessor">#include <QtSensors></span>
<span class="comment">/*
\class QSensorItem
\brief The QSensorItem type provides information about the metadata from a sensors installed on the system.
*/</span>
<span class="comment">/*
Construct a QSensorItem object with parent \a parent
*/</span>
<span class="type">QSensorItem</span><span class="operator">::</span><span class="type">QSensorItem</span>(<span class="type">QObject</span><span class="operator">*</span> parent)
: <span class="type">QObject</span>(parent)
<span class="operator">,</span> _qsensor(<span class="number">0</span>)
{
}
<span class="comment">/*
Construct a QSensorItem object with QSensor \a sensor and parent \a parent
*/</span>
<span class="type">QSensorItem</span><span class="operator">::</span><span class="type">QSensorItem</span>(<span class="type"><a href="qsensor.html">QSensor</a></span><span class="operator">*</span> sensor<span class="operator">,</span> <span class="type">QObject</span><span class="operator">*</span> parent)
: <span class="type">QObject</span>(parent)
<span class="operator">,</span> _qsensor(sensor)
{
}
<span class="comment">/*
Destructor of a QSensorItem
*/</span>
<span class="type">QSensorItem</span><span class="operator">::</span><span class="operator">~</span><span class="type">QSensorItem</span>()
{
}
<span class="comment">/*
\fn QSensorItem::startChanged()
Notifies the client if the sensors has changed its start active status
*/</span>
<span class="comment">/*
\property QSensorItem::start
This property starts or stops the sensor
*/</span>
bool <span class="type">QSensorItem</span><span class="operator">::</span>start()
{
<span class="keyword">return</span> (_qsensor <span class="operator">?</span> _qsensor<span class="operator">-</span><span class="operator">></span>isActive() : <span class="keyword">false</span>);
}
<span class="type">void</span> <span class="type">QSensorItem</span><span class="operator">::</span>setStart(bool run)
{
<span class="keyword">if</span> (_qsensor)
_qsensor<span class="operator">-</span><span class="operator">></span>setActive(run);
}
<span class="comment">/*
\property QSensorItem::id
Returns the sensor id of the sensor item
*/</span>
<span class="type">QString</span> <span class="type">QSensorItem</span><span class="operator">::</span>id()
{
<span class="keyword">return</span> (_qsensor <span class="operator">?</span> _qsensor<span class="operator">-</span><span class="operator">></span>identifier() : <span class="string">""</span>);
}
<span class="comment">/*
Set the new value \a val to the QPropertyInfo object \a property
*/</span>
<span class="type">void</span> <span class="type">QSensorItem</span><span class="operator">::</span>changePropertyValue(<span class="type">QPropertyInfo</span><span class="operator">*</span> property<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span><span class="operator">&</span> val)
{
<span class="keyword">if</span> (_qsensor <span class="operator">&</span><span class="operator">&</span> _sensorProperties<span class="operator">.</span>contains(property)){
<span class="keyword">if</span> ( _qsensor<span class="operator">-</span><span class="operator">></span>setProperty(property<span class="operator">-</span><span class="operator">></span>name()<span class="operator">.</span>toLatin1()<span class="operator">.</span>constData()<span class="operator">,</span> <span class="type">QVariant</span>(val)))
updateSensorPropertyValues();
<span class="keyword">else</span>
qWarning() <span class="operator"><</span><span class="operator"><</span> <span class="string">"new property value couldn't be set"</span>;
}
}
<span class="comment">/*
Reading the metadata and activates the sensor.
*/</span>
<span class="type">void</span> <span class="type">QSensorItem</span><span class="operator">::</span>select()
{
<span class="keyword">if</span> (_sensorProperties<span class="operator">.</span>isEmpty()) {
<span class="comment">// Probe the reading using Qt's meta-object facilities</span>
<span class="comment">//Read properties from reader</span>
<span class="type"><a href="qsensorreading.html">QSensorReading</a></span> <span class="operator">*</span>reading <span class="operator">=</span> _qsensor<span class="operator">-</span><span class="operator">></span>reading();
<span class="keyword">const</span> <span class="type">QMetaObject</span> <span class="operator">*</span>mo <span class="operator">=</span> reading<span class="operator">-</span><span class="operator">></span>metaObject();
<span class="type">int</span> firstProperty <span class="operator">=</span> <span class="type"><a href="qsensorreading.html">QSensorReading</a></span><span class="operator">::</span>staticMetaObject<span class="operator">.</span>propertyOffset();
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> firstProperty; i <span class="operator"><</span> mo<span class="operator">-</span><span class="operator">></span>propertyCount(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type">QString</span> typeName <span class="operator">=</span> QLatin1String(mo<span class="operator">-</span><span class="operator">></span>property(i)<span class="operator">.</span>typeName());
<span class="type">int</span> crap <span class="operator">=</span> typeName<span class="operator">.</span>lastIndexOf(<span class="string">"::"</span>);
<span class="keyword">if</span> (crap <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
typeName <span class="operator">=</span> typeName<span class="operator">.</span>mid(crap <span class="operator">+</span> <span class="number">2</span>);
<span class="type">QPropertyInfo</span><span class="operator">*</span> pi <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPropertyInfo</span>(mo<span class="operator">-</span><span class="operator">></span>property(i)<span class="operator">.</span>name()
<span class="operator">,</span> i
<span class="operator">,</span> isWriteable(mo<span class="operator">-</span><span class="operator">></span>property(i)<span class="operator">.</span>name())
<span class="operator">,</span> typeName
<span class="operator">,</span> <span class="string">"-"</span>
<span class="operator">,</span> <span class="keyword">this</span>);
_readerProperties<span class="operator">.</span>append(pi);
}
<span class="comment">//Read properties from sensor</span>
<span class="keyword">const</span> <span class="type">QMetaObject</span> <span class="operator">*</span>mo1 <span class="operator">=</span> _qsensor<span class="operator">-</span><span class="operator">></span>metaObject();
firstProperty <span class="operator">=</span> <span class="type"><a href="qsensorreading.html">QSensorReading</a></span><span class="operator">::</span>staticMetaObject<span class="operator">.</span>propertyOffset();
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> firstProperty; i <span class="operator"><</span> mo1<span class="operator">-</span><span class="operator">></span>propertyCount(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type">QString</span> propertyname <span class="operator">=</span> mo1<span class="operator">-</span><span class="operator">></span>property(i)<span class="operator">.</span>name();
<span class="keyword">if</span> (ignoreProperty(propertyname))
<span class="keyword">continue</span>;
<span class="type">QString</span> typeName <span class="operator">=</span> QLatin1String(mo1<span class="operator">-</span><span class="operator">></span>property(i)<span class="operator">.</span>typeName());
<span class="type">int</span> crap <span class="operator">=</span> typeName<span class="operator">.</span>lastIndexOf(<span class="string">"::"</span>);
<span class="keyword">if</span> (crap <span class="operator">!</span><span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>)
typeName <span class="operator">=</span> typeName<span class="operator">.</span>mid(crap <span class="operator">+</span> <span class="number">2</span>);
<span class="type">QPropertyInfo</span><span class="operator">*</span> pi <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPropertyInfo</span>(propertyname
<span class="operator">,</span> i
<span class="operator">,</span> isWriteable(propertyname)
<span class="operator">,</span> typeName
<span class="operator">,</span> <span class="string">"-"</span>
<span class="operator">,</span> <span class="keyword">this</span>);
_sensorProperties<span class="operator">.</span>append(pi);
}
updateSensorPropertyValues();
connect(_qsensor<span class="operator">,</span> SIGNAL(readingChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(sensorReadingChanged()));
}
connect(_qsensor<span class="operator">,</span> SIGNAL(activeChanged())<span class="operator">,</span> SIGNAL(startChanged()));
}
<span class="comment">/*
Unselect the sensor by stopping the sensor.
*/</span>
<span class="type">void</span> <span class="type">QSensorItem</span><span class="operator">::</span>unSelect()
{
_qsensor<span class="operator">-</span><span class="operator">></span>stop();
disconnect(_qsensor<span class="operator">,</span> SIGNAL(activeChanged())<span class="operator">,</span> <span class="keyword">this</span> <span class="operator">,</span> SIGNAL(startChanged()));
}
<span class="comment">/*
Updates the property values from QSensor
*/</span>
<span class="type">void</span> <span class="type">QSensorItem</span><span class="operator">::</span>updateSensorPropertyValues()
{
<span class="keyword">if</span> (_qsensor){
<span class="keyword">const</span> <span class="type">QMetaObject</span> <span class="operator">*</span>mo <span class="operator">=</span> _qsensor<span class="operator">-</span><span class="operator">></span>metaObject();
<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> _sensorProperties<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>){
<span class="type">QVariant</span> val <span class="operator">=</span> mo<span class="operator">-</span><span class="operator">></span>property(_sensorProperties<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>index())<span class="operator">.</span>read(_qsensor);
_sensorProperties<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setValue(convertValue(_sensorProperties<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>typeName()<span class="operator">,</span> val));
}
}
}
<span class="comment">/*
\fn QSensorItem::propertiesChanged()
Notifies the client if the list of the properties was changed
*/</span>
<span class="comment">/*
Updates the property values from the QSensorReader
*/</span>
<span class="type">void</span> <span class="type">QSensorItem</span><span class="operator">::</span>sensorReadingChanged()
{
<span class="type"><a href="qsensorreading.html">QSensorReading</a></span> <span class="operator">*</span>reading <span class="operator">=</span> _qsensor<span class="operator">-</span><span class="operator">></span>reading();
<span class="keyword">const</span> <span class="type">QMetaObject</span> <span class="operator">*</span>mo <span class="operator">=</span> reading<span class="operator">-</span><span class="operator">></span>metaObject();
<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> _readerProperties<span class="operator">.</span>count(); i<span class="operator">+</span><span class="operator">+</span>){
<span class="type">QVariant</span> val <span class="operator">=</span> mo<span class="operator">-</span><span class="operator">></span>property(_readerProperties<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>index())<span class="operator">.</span>read(reading);
_readerProperties<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>setValue(convertValue(_readerProperties<span class="operator">[</span>i<span class="operator">]</span><span class="operator">-</span><span class="operator">></span>typeName()<span class="operator">,</span> val));
}
}
<span class="comment">/*
Returns true if the property with the name \a propertyname should be ignored
*/</span>
bool <span class="type">QSensorItem</span><span class="operator">::</span>ignoreProperty(<span class="keyword">const</span> <span class="type">QString</span><span class="operator">&</span> propertyname)
{
<span class="keyword">if</span> (propertyname <span class="operator">=</span><span class="operator">=</span> <span class="string">"reading"</span> <span class="operator">|</span><span class="operator">|</span>
propertyname <span class="operator">=</span><span class="operator">=</span> <span class="string">"active"</span> <span class="operator">|</span><span class="operator">|</span>
propertyname <span class="operator">=</span><span class="operator">=</span> <span class="string">"identifier"</span> <span class="operator">|</span><span class="operator">|</span>
propertyname <span class="operator">=</span><span class="operator">=</span> <span class="string">"connectedToBackend"</span> <span class="operator">|</span><span class="operator">|</span>
propertyname <span class="operator">=</span><span class="operator">=</span> <span class="string">"busy"</span>)
<span class="keyword">return</span> <span class="keyword">true</span>;
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="comment">/*
Returns true if the property with the name \a propertyname is writeable
*/</span>
bool <span class="type">QSensorItem</span><span class="operator">::</span>isWriteable(<span class="keyword">const</span> <span class="type">QString</span><span class="operator">&</span> propertyname)
{
<span class="keyword">if</span> (_qsensor){
<span class="keyword">const</span> <span class="type">QMetaObject</span> <span class="operator">*</span>mo <span class="operator">=</span> _qsensor<span class="operator">-</span><span class="operator">></span>metaObject();
<span class="type">int</span> propertyindex <span class="operator">=</span> mo<span class="operator">-</span><span class="operator">></span>indexOfProperty(propertyname<span class="operator">.</span>toLocal8Bit()<span class="operator">.</span>constData());
<span class="keyword">if</span> (propertyindex <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>){
<span class="type">QMetaProperty</span> prop <span class="operator">=</span> mo<span class="operator">-</span><span class="operator">></span>property(propertyindex);
<span class="keyword">return</span> prop<span class="operator">.</span>isWritable();
}
<span class="keyword">else</span> {
<span class="type"><a href="qsensorreading.html">QSensorReading</a></span> <span class="operator">*</span>reading <span class="operator">=</span> _qsensor<span class="operator">-</span><span class="operator">></span>reading();
<span class="keyword">const</span> <span class="type">QMetaObject</span> <span class="operator">*</span>moreader <span class="operator">=</span> reading<span class="operator">-</span><span class="operator">></span>metaObject();
propertyindex <span class="operator">=</span> moreader<span class="operator">-</span><span class="operator">></span>indexOfProperty(propertyname<span class="operator">.</span>toLocal8Bit()<span class="operator">.</span>constData());
<span class="keyword">if</span> (propertyindex <span class="operator">></span><span class="operator">=</span> <span class="number">0</span>){
<span class="type">QMetaProperty</span> prop <span class="operator">=</span> mo<span class="operator">-</span><span class="operator">></span>property(propertyindex);
<span class="keyword">return</span> prop<span class="operator">.</span>isWritable();
}
}
}
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="comment">/*
Convert the variant \a val dependent on the type \a type and returns the converted value as a QString
*/</span>
<span class="type">QString</span> <span class="type">QSensorItem</span><span class="operator">::</span>convertValue(<span class="keyword">const</span> <span class="type">QString</span><span class="operator">&</span> type<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QVariant</span><span class="operator">&</span> val)
{
<span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="string">"LightLevel"</span>){
<span class="keyword">switch</span> (val<span class="operator">.</span>toInt()) {
<span class="keyword">case</span> <span class="number">1</span>: <span class="keyword">return</span> <span class="string">"Dark"</span>;
<span class="keyword">case</span> <span class="number">2</span>: <span class="keyword">return</span> <span class="string">"Twilight"</span>;
<span class="keyword">case</span> <span class="number">3</span>: <span class="keyword">return</span> <span class="string">"Light"</span>;
<span class="keyword">case</span> <span class="number">4</span>: <span class="keyword">return</span> <span class="string">"Bright"</span>;
<span class="keyword">case</span> <span class="number">5</span>: <span class="keyword">return</span> <span class="string">"Sunny"</span>;
<span class="keyword">default</span>: <span class="keyword">return</span> <span class="string">"Undefined"</span>;
}
}
<span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="string">"Orientation"</span>){
<span class="keyword">switch</span> (val<span class="operator">.</span>toInt()) {
<span class="keyword">case</span> <span class="number">1</span>: <span class="keyword">return</span> <span class="string">"TopUp"</span>;
<span class="keyword">case</span> <span class="number">2</span>: <span class="keyword">return</span> <span class="string">"TopDown"</span>;
<span class="keyword">case</span> <span class="number">3</span>: <span class="keyword">return</span> <span class="string">"LeftUp"</span>;
<span class="keyword">case</span> <span class="number">4</span>: <span class="keyword">return</span> <span class="string">"RightUp"</span>;
<span class="keyword">case</span> <span class="number">5</span>: <span class="keyword">return</span> <span class="string">"FaceUp"</span>;
<span class="keyword">case</span> <span class="number">6</span>: <span class="keyword">return</span> <span class="string">"FaceDown"</span>;
<span class="keyword">default</span>: <span class="keyword">return</span> <span class="string">"Undefined"</span>;
}
}
<span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="string">"qrangelist"</span>){
qrangelist rangelist <span class="operator">=</span> val<span class="operator">.</span>value<span class="operator"><</span>qrangelist<span class="operator">></span>();
<span class="type">QStringList</span> ranges;
foreach (<span class="keyword">const</span> qrange <span class="operator">&</span>r<span class="operator">,</span> rangelist) {
<span class="keyword">if</span> (r<span class="operator">.</span>first <span class="operator">=</span><span class="operator">=</span> r<span class="operator">.</span>second)
ranges <span class="operator"><</span><span class="operator"><</span> <span class="type">QString</span>(<span class="string">"%1 Hz"</span>)<span class="operator">.</span>arg(r<span class="operator">.</span>first);
<span class="keyword">else</span>
ranges <span class="operator"><</span><span class="operator"><</span> <span class="type">QString</span>(<span class="string">"%1-%2 Hz"</span>)<span class="operator">.</span>arg(r<span class="operator">.</span>first)<span class="operator">.</span>arg(r<span class="operator">.</span>second);
}
<span class="keyword">if</span> (ranges<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span>)
<span class="keyword">return</span> ranges<span class="operator">.</span>join(<span class="string">", "</span>);
<span class="keyword">return</span> <span class="string">"-"</span>;
}
<span class="keyword">else</span> <span class="keyword">if</span> (type <span class="operator">=</span><span class="operator">=</span> <span class="string">"qoutputrangelist"</span>) {
qoutputrangelist rangelist <span class="operator">=</span> val<span class="operator">.</span>value<span class="operator"><</span>qoutputrangelist<span class="operator">></span>();
<span class="type">QStringList</span> ranges;
foreach (<span class="keyword">const</span> qoutputrange <span class="operator">&</span>r<span class="operator">,</span> rangelist) {
ranges <span class="operator"><</span><span class="operator"><</span> <span class="type">QString</span>(<span class="string">"(%1, %2) += %3"</span>)<span class="operator">.</span>arg(r<span class="operator">.</span>minimum)<span class="operator">.</span>arg(r<span class="operator">.</span>maximum)<span class="operator">.</span>arg(r<span class="operator">.</span>accuracy);
}
<span class="keyword">if</span> (ranges<span class="operator">.</span>count() <span class="operator">></span> <span class="number">0</span>)
<span class="keyword">return</span> ranges<span class="operator">.</span>join(<span class="string">", "</span>);
<span class="keyword">return</span> <span class="string">"-"</span>;
}
<span class="keyword">return</span> val<span class="operator">.</span>toString();
}
<span class="comment">/*
\property QSensorItem::properties
Returns a list of all properties from the sensor
*/</span>
<span class="type">QQmlListProperty</span><span class="operator"><</span><span class="type">QPropertyInfo</span><span class="operator">></span> <span class="type">QSensorItem</span><span class="operator">::</span>properties()
{
_properties<span class="operator">.</span>clear();
_properties<span class="operator">.</span>append(_sensorProperties);
_properties<span class="operator">.</span>append(_readerProperties);
<span class="keyword">return</span> <span class="type">QQmlListProperty</span><span class="operator"><</span><span class="type">QPropertyInfo</span><span class="operator">></span> (<span class="keyword">this</span><span class="operator">,</span> _properties);
}
</pre>
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<!-- @@@sensor_explorer/import/sensoritem.cpp -->
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