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<h1 class="title">guitartunerui.cpp Example File</h1>
<span class="small-subtitle">demos/mobile/guitartuner/src/guitartunerui.cpp</span>
<!-- $$$demos/mobile/guitartuner/src/guitartunerui.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 <QTimer></span>
<span class="preprocessor">#include "guitartunerui.h"</span>
<span class="preprocessor">#include "ui_guitartunerui.h"</span>
GuitarTunerUI<span class="operator">::</span>GuitarTunerUI(<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)<span class="operator">,</span>
ui(<span class="keyword">new</span> Ui<span class="operator">::</span>GuitarTunerUI)<span class="operator">,</span>
m_maximumPrecision(<span class="number">0</span>)
{
ui<span class="operator">-</span><span class="operator">></span>setupUi(<span class="keyword">this</span>);
<span class="comment">// Set up the class attributes to proper values.</span>
m_outputActive <span class="operator">=</span> <span class="keyword">false</span>;
m_muted <span class="operator">=</span> <span class="keyword">false</span>;
m_outputVolumeLevel <span class="operator">=</span> getVolumeFromSoundSlider();
m_inputVolumeLevel <span class="operator">=</span> <span class="number">1.0</span> <span class="operator">-</span> m_outputVolumeLevel;
<span class="comment">// Set up the current tone, the frequency, and the name for it.</span>
m_currentToneIndex <span class="operator">=</span> <span class="number">5</span>;
updateFrequencyByToneIndex(m_currentToneIndex);
<span class="comment">// Connect the signals from UI into proper slots.</span>
connect(ui<span class="operator">-</span><span class="operator">></span>soundSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span>
SLOT(changeVolume()));
connect(ui<span class="operator">-</span><span class="operator">></span>soundButton<span class="operator">,</span> SIGNAL(toggled(<span class="type">bool</span>))<span class="operator">,</span>
SLOT(toggleSound(<span class="type">bool</span>)));
connect(ui<span class="operator">-</span><span class="operator">></span>modeButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
SLOT(toggleInputOrOutput()));
connect(ui<span class="operator">-</span><span class="operator">></span>buttonNext<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> SLOT(next()));
connect(ui<span class="operator">-</span><span class="operator">></span>buttonPrev<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> SLOT(prev()));
<span class="comment">// Initialise up the UI by calling toggleInputOrOutput</span>
<span class="comment">// for the first time.</span>
toggleInputOrOutput();
}
GuitarTunerUI<span class="operator">::</span><span class="operator">~</span>GuitarTunerUI()
{
<span class="keyword">delete</span> ui;
}
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>changeEvent(<span class="type"><a href="qevent.html">QEvent</a></span> <span class="operator">*</span>e)
{
<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>changeEvent(e);
<span class="keyword">switch</span> (e<span class="operator">-</span><span class="operator">></span>type()) {
<span class="keyword">case</span> <span class="type"><a href="qevent.html">QEvent</a></span><span class="operator">::</span>LanguageChange:
ui<span class="operator">-</span><span class="operator">></span>retranslateUi(<span class="keyword">this</span>);
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
<span class="comment">/**
* Returns a value from 0 to 1, representing the volume.
*/</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> GuitarTunerUI<span class="operator">::</span>getVolumeFromSoundSlider() <span class="keyword">const</span>
{
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> value <span class="operator">=</span> ui<span class="operator">-</span><span class="operator">></span>soundSlider<span class="operator">-</span><span class="operator">></span>value();
<span class="keyword">return</span> value<span class="operator">/</span>ui<span class="operator">-</span><span class="operator">></span>soundSlider<span class="operator">-</span><span class="operator">></span>maximum();
}
<span class="comment">/**
* Updates the m_currentToneFrequency and m_currentToneString,
* according to the given index. Also updates the UI.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>updateFrequencyByToneIndex(<span class="type">int</span> index)
{
<span class="keyword">switch</span> (index) {
<span class="keyword">case</span> <span class="number">0</span>: {
m_currentToneFrequency <span class="operator">=</span> FrequencyE;
m_currentToneString <span class="operator">=</span> <span class="string">"E"</span>;
<span class="keyword">break</span>;
}
<span class="keyword">case</span> <span class="number">1</span>: {
m_currentToneFrequency <span class="operator">=</span> FrequencyA;
m_currentToneString <span class="operator">=</span> <span class="string">"A"</span>;
<span class="keyword">break</span>;
}
<span class="keyword">case</span> <span class="number">2</span>: {
m_currentToneFrequency <span class="operator">=</span> FrequencyD;
m_currentToneString <span class="operator">=</span> <span class="string">"D"</span>;
<span class="keyword">break</span>;
}
<span class="keyword">case</span> <span class="number">3</span>: {
m_currentToneFrequency <span class="operator">=</span> FrequencyG;
m_currentToneString <span class="operator">=</span> <span class="string">"G"</span>;
<span class="keyword">break</span>;
}
<span class="keyword">case</span> <span class="number">4</span>: {
m_currentToneFrequency <span class="operator">=</span> FrequencyB;
m_currentToneString <span class="operator">=</span> <span class="string">"B"</span>;
<span class="keyword">break</span>;
}
<span class="keyword">case</span> <span class="number">5</span>: {
m_currentToneFrequency <span class="operator">=</span> FrequencyE2;
m_currentToneString <span class="operator">=</span> <span class="string">"e"</span>;
<span class="keyword">break</span>;
}
<span class="keyword">default</span>: {
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"invalid index!"</span> <span class="operator"><</span><span class="operator"><</span> index;
}
}
<span class="comment">// Set the noteLabel text according to the current tone.</span>
ui<span class="operator">-</span><span class="operator">></span>noteLabel<span class="operator">-</span><span class="operator">></span>setText(m_currentToneString);
}
<span class="comment">/**
* Returns the volume.
*/</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> GuitarTunerUI<span class="operator">::</span>getVolume() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_outputVolumeLevel;
}
<span class="comment">/**
* Returns true if the sound is muted.
*/</span>
<span class="type">bool</span> GuitarTunerUI<span class="operator">::</span>getMuteState() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_muted;
}
<span class="comment">/**
* Returns the microphone sensitivity.
*/</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> GuitarTunerUI<span class="operator">::</span>getMicrophoneSensitivity() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_inputVolumeLevel;
}
<span class="comment">/**
* Returns whether the input mode is active.
*/</span>
<span class="type">bool</span> GuitarTunerUI<span class="operator">::</span>isInputModeActive() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="operator">!</span>m_outputActive;
}
<span class="comment">/**
* Returns the current target frequency.
*/</span>
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> GuitarTunerUI<span class="operator">::</span>getFrequency() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_currentToneFrequency;
}
<span class="comment">/**
* Toggles the sound according to the parameter.
* Has no effect if output is not active.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>toggleSound(<span class="type">bool</span> noSound)
{
<span class="keyword">if</span> (<span class="operator">!</span>m_outputActive) {
<span class="keyword">return</span>;
}
m_muted <span class="operator">=</span> noSound;
<span class="keyword">emit</span> muteChanged(m_muted);
}
<span class="comment">/**
* Changes the volume or microphone sensitivity.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>changeVolume()
{
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> resultingAmplitude <span class="operator">=</span> getVolumeFromSoundSlider();
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"resultingAmplitude"</span> <span class="operator"><</span><span class="operator"><</span> resultingAmplitude;
<span class="keyword">if</span> (m_outputActive) {
m_outputVolumeLevel <span class="operator">=</span> resultingAmplitude;
<span class="keyword">emit</span> volumeChanged(resultingAmplitude);
}
<span class="keyword">else</span> {
m_inputVolumeLevel <span class="operator">=</span> resultingAmplitude;
<span class="keyword">emit</span> microphoneSensitivityChanged(<span class="number">1.0</span><span class="operator">-</span>resultingAmplitude);
}
}
<span class="comment">/**
* Toggles input or output, depending of the current state.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>toggleInputOrOutput()
{
<span class="comment">// If output mode is active:</span>
<span class="keyword">if</span> (m_outputActive) {
<span class="comment">// Change UI to correspond to the input mode.</span>
m_outputActive <span class="operator">=</span> <span class="keyword">false</span>;
ui<span class="operator">-</span><span class="operator">></span>soundSlider<span class="operator">-</span><span class="operator">></span>setValue(m_inputVolumeLevel<span class="operator">*</span><span class="number">100</span>);
ui<span class="operator">-</span><span class="operator">></span>soundButton<span class="operator">-</span><span class="operator">></span>setDisabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>soundButton<span class="operator">-</span><span class="operator">></span>hide();
ui<span class="operator">-</span><span class="operator">></span>micSensitivityLabel<span class="operator">-</span><span class="operator">></span>show();
<span class="keyword">emit</span> modeChanged(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>modeButton<span class="operator">-</span><span class="operator">></span>setText(<span class="string">"To tone mode"</span>);
}
<span class="comment">// Else:</span>
<span class="keyword">else</span> {
<span class="comment">// Change UI to correspond to the output mode.</span>
m_outputActive <span class="operator">=</span> <span class="keyword">true</span>;
ui<span class="operator">-</span><span class="operator">></span>soundSlider<span class="operator">-</span><span class="operator">></span>setValue(m_outputVolumeLevel<span class="operator">*</span><span class="number">100</span>);
ui<span class="operator">-</span><span class="operator">></span>soundButton<span class="operator">-</span><span class="operator">></span>setDisabled(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>micSensitivityLabel<span class="operator">-</span><span class="operator">></span>hide();
ui<span class="operator">-</span><span class="operator">></span>soundButton<span class="operator">-</span><span class="operator">></span>show();
<span class="keyword">emit</span> modeChanged(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>modeButton<span class="operator">-</span><span class="operator">></span>setText(<span class="string">"To listen mode"</span>);
}
}
<span class="comment">/**
* Receives the low voice signal.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>lowVoice()
{
<span class="keyword">if</span> (ui<span class="operator">-</span><span class="operator">></span>noteLabel<span class="operator">-</span><span class="operator">></span>font()<span class="operator">.</span>bold()) {
<span class="type"><a href="qfont.html">QFont</a></span> font;
font<span class="operator">.</span>setBold(<span class="keyword">false</span>);
font<span class="operator">.</span>setUnderline(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>noteLabel<span class="operator">-</span><span class="operator">></span>setFont(font);
}
}
<span class="comment">/**
* Receives the voice difference signal.
* The difference is qreal, where increase of 1 corresponds
* to increase of 1 tone to the target frequency.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>voiceDifference(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> difference)
{
<span class="keyword">if</span> (ui<span class="operator">-</span><span class="operator">></span>noteLabel<span class="operator">-</span><span class="operator">></span>font()<span class="operator">.</span>bold()) {
<span class="type"><a href="qfont.html">QFont</a></span> font;
font<span class="operator">.</span>setBold(<span class="keyword">false</span>);
font<span class="operator">.</span>setUnderline(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>noteLabel<span class="operator">-</span><span class="operator">></span>setFont(font);
}
ui<span class="operator">-</span><span class="operator">></span>correctSoundSlider<span class="operator">-</span><span class="operator">></span>setValue(difference<span class="operator">*</span>m_maximumPrecision);
}
<span class="comment">/**
* Receives the correct frequency signal.
* Makes the UI to visualize correct frequency event.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>correctFrequencyObtained()
{
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"CORRECT FREQUENCY"</span>;
<span class="type"><a href="qfont.html">QFont</a></span> font;
font<span class="operator">.</span>setBold(<span class="keyword">true</span>);
font<span class="operator">.</span>setUnderline(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>noteLabel<span class="operator">-</span><span class="operator">></span>setFont(font);
}
<span class="comment">/**
* Sets up the maximum voice difference.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>setMaximumVoiceDifference(<span class="type">int</span> max)
{
<span class="comment">// Assert that the maximum precision is known.</span>
Q_ASSERT(m_maximumPrecision <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
<span class="comment">// Set the maximum and minimum values of the correctSoundSlider</span>
<span class="comment">// to the +- max*m_maximumPrecision, and set the tick interval</span>
<span class="comment">// to be m_maximumPrecision.</span>
ui<span class="operator">-</span><span class="operator">></span>correctSoundSlider<span class="operator">-</span><span class="operator">></span>setMaximum(max<span class="operator">*</span>m_maximumPrecision);
ui<span class="operator">-</span><span class="operator">></span>correctSoundSlider<span class="operator">-</span><span class="operator">></span>setMinimum(<span class="operator">-</span>max<span class="operator">*</span>m_maximumPrecision);
ui<span class="operator">-</span><span class="operator">></span>correctSoundSlider<span class="operator">-</span><span class="operator">></span>setTickInterval(max<span class="operator">*</span>m_maximumPrecision);
}
<span class="comment">/**
* Stores the maximum precision per note. Used to setup the
* correct sound slider.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>setMaximumPrecisionPerNote(<span class="type">int</span> max)
{
m_maximumPrecision <span class="operator">=</span> max;
}
<span class="comment">/**
* Changes the tone to the next value.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>next()
{
changeTone((m_currentToneIndex <span class="operator">+</span> <span class="number">1</span>) <span class="operator">%</span> <span class="number">6</span>);
}
<span class="comment">/**
* Changes the tone to the previous value.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>prev()
{
changeTone((m_currentToneIndex <span class="operator">+</span> <span class="number">5</span>) <span class="operator">%</span> <span class="number">6</span>);
}
<span class="comment">/**
* Changes the tone according to the new index.
*/</span>
<span class="type">void</span> GuitarTunerUI<span class="operator">::</span>changeTone(<span class="type">int</span> newIndex)
{
m_currentToneIndex <span class="operator">=</span> newIndex;
updateFrequencyByToneIndex(m_currentToneIndex);
<a href="qtglobal.html#qDebug">qDebug</a>() <span class="operator"><</span><span class="operator"><</span> <span class="string">"targetFrequencyChanged"</span> <span class="operator"><</span><span class="operator"><</span> m_currentToneFrequency;
<span class="keyword">emit</span> targetFrequencyChanged(m_currentToneFrequency);
}</pre>
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<!-- @@@demos/mobile/guitartuner/src/guitartunerui.cpp -->
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